WO2010041593A1

WO2010041593A1 - Syringe pump

Info

Publication number: WO2010041593A1
Application number: PCT/JP2009/067209
Authority: WO
Inventors: 中西勝
Original assignee: テルモ株式会社
Priority date: 2008-10-06
Filing date: 2009-10-02
Publication date: 2010-04-15
Also published as: JP5457365B2; JPWO2010041593A1

Abstract

The syringe pump (10) comprises a syringe-loading part (34) that holds the external cylinder (18) of the syringe (12a), a slider (60) that holds the plunger (16) of the loaded syringe (12a), a setting groove (42) that is provided adjacent to the syringe-loading part (34) and where the external cylinder flange (20) of the external cylinder (18) is mounted, two detection switches (40a, 40b) that are disposed at different positions with respect to the axial direction of the loaded syringe (12a) and are pressed by the external cylinder (18) of the loaded syringe, and a computer (110) that judges whether the external cylinder (18) of the syringe has been properly loaded in the syringe-loading part (34) by the detection switches (40a, 40b) each detecting the external cylinder (18) of the syringe, which serves as a criterion for a prescribed output.

Description

Syringe pump

The present invention relates to a syringe pump in which various syringes are placed and fixed, and liquid is fed by pushing out a pusher flange of a pusher in the placed syringe with a slider.

In an intensive care unit (ICU) or the like, a syringe pump is widely used to deliver a drug solution or a nutrient to a patient accurately and over a long period of time. The syringe pump can perform high-precision liquid feeding by placing and fixing various syringes and pushing out a pusher flange of the pusher in the placed syringe while accurately controlling the speed with a slider.

The syringe pump can be mounted with syringes of various sizes, and has a configuration in which the amount of liquid to be fed can be set easily, and is highly versatile. Such syringe pumps are disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-73373 (US 7,153,290B2) and Japanese Patent Application Laid-Open No. 2007-306990.

In the syringe pump, in order to place various sizes of syringes and send liquids, the syringe pump is placed with a clamp that is pulled down by an elastic body and is in contact with the upper surface of the placed outer cylinder and fixed. A lever for holding the pusher flange of the pusher in the syringe on the slider is provided. The clamp can be selected by rotating between a release position and a fixed position, and the outer cylinder can be fixed by being lowered elastically at the fixed position. The lever is provided with a pair of elastically openable / closable levers, and can be fixed to the slider by sandwiching pusher flanges of various diameters.

In the syringe pump, the outer cylinder and the pusher flange are securely fixed by the slider having the clamp and the lever, and stable liquid feeding is possible.

On the other hand, in the previous stage, placing the outer cylinder on the syringe mounting section, fixing the outer cylinder with a clamp, and fixing the pusher flange of the pusher with a lever are operations performed by medical personnel And the correct operation is being enforced.

From such a background, in the syringe pump described in Japanese Patent Application Laid-Open No. 2007-306990, it has been proposed to provide a switch that is operated by an outer cylinder on the syringe mounting portion.

As shown in FIG. 18, by providing a switch 901 on the syringe mounting portion 900, the switch 901 is pushed by the syringe outer cylinder 902 when the outer cylinder flange 903 of the syringe outer cylinder 902 is correctly attached to the set groove 904. Thus, it can be detected that the syringe outer cylinder 902 is correctly placed.

By the way, as shown in FIG. 18, in the configuration in which one switch 901 is provided in the syringe mounting part 900, if the outer cylinder flange 903 is arranged just at the position of the switch 901 as shown in FIG. 19, There is a concern that the switch 901 is turned on and erroneously recognizes that the syringe outer cylinder 902 is correctly placed.

Such a misrecognition can be prevented by providing a switch in the set groove 904, but the set groove 904 is narrow and it is difficult to arrange and assemble the switch.

Even if the situation shown in FIG. 19 occurs, it can be recognized that the placement method is clearly inappropriate by visual observation, and improper placement can be confirmed by pressing the syringe outer cylinder 902 with a predetermined clamp. Although it is detectable, it is desirable to be able to detect such an inappropriate state more reliably.

The present invention has been made in view of such problems, and an object of the present invention is to provide a syringe pump that can more reliably detect whether or not the outer cylinder is mounted on the syringe mounting portion.

The syringe pump according to the present invention is provided adjacent to the syringe mounting portion for mounting an outer cylinder of the syringe, a slider for holding a pusher of the mounted syringe, and the outer surface of the syringe mounting portion. A set groove in which an outer cylinder flange of the cylinder is mounted and a position different in the axial direction of the syringe placed on the syringe placement section, and is pressed when the syringe is placed. A plurality of outer cylinder detection units, and a control unit that determines that the outer cylinders are properly placed on the syringe placement unit by detecting the outer cylinders by the plurality of outer cylinder detection units, respectively. It is characterized by.

As described above, when a plurality of (hereinafter referred to as N) outer cylinder detection units are provided at different positions in the axial direction of the syringe, the outer cylinder is appropriately placed on the mounting unit. The surface acts on each of the N outer cylinder detection units, and the control unit can detect that the outer cylinder is properly placed.

On the other hand, even if the outer cylinder flange acts on the N-1 outer cylinder detectors by improperly placing the outer cylinder, one or more other syringe outer cylinder detectors will act. Therefore, the control unit can detect that the outer cylinder is improperly placed.

The interval between the plurality of outer cylinder detection units in the axial direction is preferably 5 mm to 10 mm. Thereby, a necessary and sufficient interval is ensured, and it is possible to prevent both of the two outer cylinder detection units from being acted on by the outer cylinder flange.

The syringe mounting unit may have a concave arc column surface with respect to the axial direction, and the plurality of outer cylinder detection units may be arranged on the arc column surface. The outer cylinder flange is substantially elliptical and is placed on the placement portion so that the large diameter direction is substantially horizontal. Therefore, by providing such an arc column surface, the outer cylinder flange comes into contact with the end or mid-height portion of the arc column surface, and the outer cylinder does not contact the outer cylinder detection unit, It is possible to prevent improper placement at the placement part and the outer cylinder detection part.

The set groove is composed of a first groove wall that constitutes the slider side and a second groove wall that constitutes the syringe mounting portion side, and is provided on the first groove wall and attached to the set groove. You may have the spring body which presses the said outer cylinder flange made to the said syringe mounting part side, and contact | abuts the said outer cylinder flange to the said 2nd groove wall. According to such a spring body, shakiness in the axial direction of the outer cylinder is eliminated, and when the pusher is started to be pushed by the slider, liquid feeding can be started immediately, and the flow rate rising performance is improved.

The set groove is composed of a first groove wall that constitutes the slider side and a second groove wall that constitutes the syringe mounting portion side, and is provided on the first groove wall, and the outer cylinder flange is You may have a projection part contact | abutted to the said outer cylinder, when the said syringe is mounted in the state exceeding the said 1st groove wall. According to such a projection, when the outer cylinder flange is improperly disposed so as to protrude beyond the set groove to the slider body side, the outer cylinder is provided with an appropriate inclination so that the part other than the tip part is separated from the syringe mounting surface. It can be prevented from floating and acting on the outer cylinder detection unit.

When the two protrusions are arranged at symmetrical positions with respect to the center line of the syringe, interference with the cross-shaped cross-shaped rib in the pusher can be prevented.

The projecting portion is provided at the upper end of the spring body so as to be integrated, thereby providing a simple configuration.

The present invention is a syringe mounting portion for mounting an outer cylinder of a syringe, a slider that holds a pusher of the mounted syringe, and the syringe mounting portion, when the syringe is mounted An outer cylinder detection unit that is pressed down, and a control unit that determines that the outer cylinder is properly placed on the syringe placement unit by detecting the outer cylinder by the outer cylinder detection unit, The syringe mounting portion has a concave arc column surface with respect to the axial direction, and the outer cylinder detection unit is arranged on the arc column surface.

The present invention provides a syringe mounting section for mounting an outer cylinder of a syringe, a slider for holding a presser of the mounted syringe, and an outer cylinder of the outer cylinder provided adjacent to the syringe mounting section. A set groove in which a flange is mounted, an outer cylinder detection unit which is disposed in the syringe mounting unit and is pressed when the syringe is mounted; and the outer cylinder detection unit detects the outer cylinder. And a control unit that determines that the outer cylinder is properly placed on the syringe placement portion, and the set groove includes a first groove wall that constitutes the slider side, and the syringe placement portion. When the syringe is placed in a state in which the outer cylinder flange extends beyond the first groove wall, the second cylinder wall is formed on the outer cylinder. It has the protrusion part which contact | abuts, It is characterized by the above-mentioned.

According to the syringe pump according to the present invention, by providing a plurality of outer cylinder detection units at different positions in the axial direction of the syringe, the outer cylinder can be appropriately placed on the syringe mounting unit, thereby The cylinder surface acts on each of the plurality of outer cylinder detection units, and the control unit can detect that the outer cylinder is properly placed.

On the other hand, even if the outer cylinder flange acts on any one of the N-1 syringe outer cylinder detectors by improperly placing the outer cylinder, the other syringe outer cylinder detectors will not function. Therefore, the control unit can detect that the outer cylinder is improperly placed.

It is a perspective view of the syringe pump which concerns on this Embodiment before a syringe is mounted. It is a perspective view of the syringe pump which concerns on this Embodiment with which the syringe was mounted. It is the perspective view which looked at the syringe pump which concerns on this Embodiment from the back surface. It is a perspective view of the syringe pump set diagonally. It is a block block diagram of the syringe pump which concerns on this Embodiment. It is a figure which shows the mode of a operation which sets a syringe. It is a figure which shows the mode of b operation which sets a syringe. It is a figure which shows the mode of c operation which sets a syringe. It is a schematic diagram which shows the state which mounted | worn the outer cylinder flange to the set groove | channel so that a large diameter direction might become horizontal, and the syringe outer cylinder was correctly mounted in the syringe mounting part. FIG. 10 is a cross-sectional side view showing the positions of the ribs of the presser and the two protrusions of the spring body provided on the first groove wall in the state shown in FIG. 9. It is a typical perspective view which shows the state which mounts a syringe outer cylinder in the state which the outer cylinder flange shifted | deviated to the syringe mounting part side rather than the set groove | channel so that the large diameter direction might become substantially horizontal. It is a typical perspective view which shows the state which mounts a syringe outer cylinder in the state which the outer cylinder flange shifted | deviated to the syringe mounting part side rather than the set groove | channel so that the large diameter direction might become substantially vertical. When the place where the detection switch is provided is a flat surface, the outer cylinder flange is mounted in the set groove so that the large diameter direction is horizontal, and the syringe outer cylinder is correctly placed on the syringe placement part. It is a schematic diagram which shows a state. It is a typical perspective view which shows the state which mounts a syringe outer cylinder, when an outer cylinder flange protrudes slightly to the slider side rather than a set groove. It is a typical perspective view which shows the state which mounts a syringe outer cylinder, when an outer cylinder flange has protruded considerably in the slider side rather than the set groove | channel. FIG. 15 is a cross-sectional side view showing positions of a syringe outer cylinder and two protrusions of a spring body provided on a first groove wall in the state shown in FIG. 14. It is a typical perspective view which shows the state which mounts a syringe outer cylinder, when a long syringe is applied and the outer cylinder flange has protruded considerably to the slider side rather than the set groove. In the syringe pump which concerns on a prior art, it is a schematic diagram which shows a mode that a syringe outer cylinder is detected by one switch of a syringe mounting part. In the syringe pump which concerns on a prior art, it is a schematic diagram which shows a mode that it has arrange | positioned in the place of an outer cylinder flange switch.

Hereinafter, a syringe pump according to the present invention will be described with reference to FIGS. First, the syringe 12a applied to the syringe pump 10 according to the present embodiment will be described.

As shown in FIG. 1, the syringe 12 a is a conventionally used general-purpose product, and includes a syringe outer cylinder (outer cylinder) 18 and a pusher 16. The syringe outer cylinder 18 includes a transparent syringe body 14 filled with a chemical solution, the outer cylinder flange 20 provided on the proximal end side, and a discharge port 24 provided on the distal end side to which the tube 22 is connected. The outer cylinder flange 20 has a substantially elliptical shape, the width in the short diameter direction is slightly wider than the diameter of the main body 14, and the width in the large diameter direction is set to a width that allows a person to put a finger on it. Yes. The outer cylinder flange 20 is reasonably thin, for example, about 1 to 2 mm thick. One end of the tube 22 is connected to the discharge port 24, and the other end is connected to an indwelling needle or the like (not shown) so that the drug solution can be injected into the patient.

The pusher 16 includes a gasket 26 that is provided at the distal end and sends out the chemical solution in the syringe outer cylinder 18, a disc-like pusher flange 28 on the proximal end side, and a rib 30 that connects the gasket 26 and the pusher flange 28. Have The pusher flange 28 has an area that can be pushed by a thumb with a thumb and is appropriately thin, for example, about 1 to 2 mm. The rib 30 has a cross-sectional shape that is thick at the distal end and thin at the proximal end, and has a sufficient rigidity and a lightweight configuration. A plurality of sizes of syringes (for example, 5 mL type, 10 mL type, 20 mL type, 30 mL type, 50 mL type, 100 mL type) can be applied to the syringe pump 10, and the syringe 12a is the longest and maximum diameter type. (Maximum capacity type, for example, 100 mL type). The syringe 12b shown in FIG. 1 is the shortest and thinnest type (minimum capacity type, for example, 5 mL type). A syringe applicable to the syringe pump 10 is also typically referred to as a syringe 12.

Hereinafter, in the description of the syringe pump 10, the long width direction is referred to as the X direction, the short width direction is referred to as the Y direction, and the height direction is referred to as the Z direction. As necessary, with reference to FIG. 1, the left side in the X direction is also referred to as the X1 direction, and the right side is also referred to as the X2 direction.

As shown in FIGS. 1 to 3, the syringe pump 10 according to the present embodiment is configured on the basis of a box-shaped housing 11 that is slightly long in the X direction, and can be recognized in plan view (recognizable in FIG. 1). Therefore, the lower half of the operation section 32, the upper half of the syringe mounting section 34, and the upper half of the pusher drive section 36 are provided. . A handle 37 is provided at the left end of the syringe pump 10 and is excellent in portability. The substantially entire upper surface of the syringe pump 10 has a substantially planar shape that forms a very gentle arc with respect to the depth direction. The syringe pump 10 has a highly water-resistant structure in which each switch (for example, a tact switch) of the operation unit 32 is covered with a surface decorative sheet.

The syringe pump 10 has a basic structure because when the syringe 12 is set, the chemical solution in the syringe 12 may spill out, the instilled medicine provided above may spill out, or the disinfectant used in the vicinity may scatter and fall down. It has a splash-proof structure.

The syringe pump 10 is connected to an AC cable 39a at a power outlet (power terminal) 39 provided at the lower side of the side surface, and is supplied with power from an external power source (AC100V, AC200V, etc.).

In the following description, the vertical direction is defined as a state in which the syringe pump 10 is placed on a horizontal desk, but the actual direction of use is not limited to this, and for example, as shown in FIG. It may be used in a state where it is fixed and set obliquely. The mounting tool 402 can adjust the inclination angle and height while holding the syringe pump 10 stably. Further, it is preferable that the mounting tool 402 can supply power to a dedicated terminal (not shown) different from the power outlet 39.

1 to 3, the syringe mounting part 34 is a part for mounting and fixing the syringe outer cylinder 18 in the direction in which the discharge port 24 is on the left side. The syringe outer cylinder 18 ( A curved portion 38 having a concave arcuate surface corresponding to the diameter of the largest diameter) is provided. The bending portion 38 forms a concave circular arc column surface based on the axial direction (X direction) of the syringe outer cylinder 18 to be placed.

The curved portion 38 is located substantially in the right half of the syringe placement portion 34, and is constituted by wall portions provided on the near side and the far side. The curved portion 38 includes a narrow groove 38a extending in the axial direction on the lowermost surface, two axially adjacent detection switches (syringe outer tube detecting portions) 40a and 40b provided in the vicinity of the X2 direction, and the X2 direction. It has a longitudinal set groove 42 provided at the end and holding the outer cylinder flange 20, and a spring body 44 that elastically presses and stabilizes the mounted outer cylinder flange 20.

The set groove 42 is a shallow groove on which the outer cylinder flange 20 is mounted and placed, and has a shape in which the maximum radial direction of the outer cylinder flange 20 is vertical, and is a first groove that forms the slider 60 side. It is comprised by the wall 42a and the 2nd groove wall 42b which comprises the syringe mounting part side. Since the thickness of the outer cylinder flange 20 differs depending on the manufacturer, the groove width of the set groove 42 is formed to be about 3.5 mm with an appropriate margin. By this set groove 42, the syringe outer cylinder 18 is properly positioned in the axial direction.

When the syringe outer cylinder 18 is placed on the syringe placement section 34, the claw 44c of the spring body 44 abuts on the lowermost portion of the outer cylinder flange 20 attached to the set groove 42, and the side of the syringe placement section 34 (X1). To the end face of the second groove wall 42b. This eliminates the shakiness in the axial direction of the syringe outer cylinder 18 and enables stable liquid feeding, and when the slider 60 starts to push the pusher 16, the liquid feeding can be started immediately. The flow rate rise performance is improved.

The narrow groove 38a is intended to stabilize the small-diameter type syringe 12b.

The two

detection switches

40a and 40b slightly protrude from the lower surface, and can be detected when the syringe outer cylinder 18 is placed by being pushed in by correctly placing the syringe outer cylinder 18 respectively. . The axial distance between the two

detection switches

40a and 40b is preferably 5 mm to 10 mm, and is covered with a single ethylene / propylene rubber film, and has high water resistance and weather resistance. The ethylene / propylene rubber film and the curved portion 38 are preferably white so that the black-printed scale provided on the syringe outer cylinder 18 is easy to see. You may provide three or

more detection switches

40a and 40b within the range of the length in which the syringe outer cylinder 18 of the shortest type syringe 12 is mounted. The two

detection switches

40a and 40b do not necessarily have to be arranged in a straight line. If they are arranged at different positions in the axial direction of the syringe 12 to be placed, they are slightly shifted in the circumferential direction. Also good. The number may be three or more. When the number of detection switches is N (≧ 2), the CPU 110 determines that the syringe 12 is properly placed when N pieces are turned on, and is inappropriate when N−1 or less pieces are turned on. What is necessary is just to judge that it was mounted.

As shown in FIG. 3, the spring body 44 is made of resin, and includes a mounting plate 44a attached to the side surface of the curved portion 38, a spring plate portion 44b protruding upward from the mounting plate 44a, and the spring plate portion 44b. A short claw 44c that is bent at an acute angle from the tip of the pin and heads obliquely downward, and a pair of thin protrusions (projections) 44d that protrude downwardly upward on both sides of the connecting portion between the spring plate portion 44b and the claw 44c. The mounting plate 44a is attached to the side surface of the first groove wall 42a by a screw, and the claw 44c slightly enters the set groove 42. The pair of protrusions 44d forms an XZ plane and has a mountain shape when viewed from the Y direction.

A clamp 50 is provided on the border between the operation section 32 and the syringe mounting section 34 on the front side of the detection switches 40a and 40b. Yes. The clamp 50 includes an elevating rod 52 that protrudes from the upper surface of the operation unit 32, and a rotating lever 54 provided at the upper end of the elevating rod 52. The rotary lever 54 has a size and a shape that can be easily operated manually. When the syringe 12 is not placed, the elevating rod 52 is pulled down by an elastic body (not shown), and the rotating lever 54 is disposed substantially horizontally from the elevating rod 52 in the X1 direction.

After fixing the syringe outer cylinder 18 on the syringe mounting portion 34, when fixing the syringe 12, first, the clamp 50 is pulled up by holding the rotation lever 54 until the rotation is restricted by a predetermined stopper. Rotate 90 ° clockwise. Next, while holding the rotation lever 54, the entire clamp is lowered by the elastic force of the elastic body, the upper surface of the syringe outer cylinder 18 is elastically contacted by the lower surface of the rotation lever 54, and is pressed and fixed with an appropriate force. (See FIGS. 2 and 8). The rotation lever 54 presses and fixes the vicinity of the outer cylinder flange 20 in the syringe outer cylinder 18.

The raising / lowering rod 52 can detect the amount of lowering by a clamp sensor (clamp detection unit) 136 (see FIG. 5), and can identify the

syringes

12 a, 12 b and the like as objects fixed by the rotating lever 54. The reverse operation may be performed when releasing the fixation of the syringe outer cylinder 18. The clamp sensor 136 may detect the rotational state.

In the vicinity of the clamp 50 in the operation unit 32, a clamp confirmation LED 58 that switches from a light-off state to a blinking state when it is determined that the pair of detection switches 40 a and 40 b are off or the clamp 50 does not fix the syringe outer cylinder 18. Is provided. A symbol is drawn adjacent to the clamp confirmation LED 58, and the operator can conceptually understand the function.

The pusher drive unit 36 includes a step surface 36a lower than the operation unit 32, a substantially vertical wall surface 36b between the step surface 36a and the operation unit 32, and a substantially vertical wall surface between the syringe mounting unit 34. It is provided in a space section defined by 36c. The pusher drive unit 36 includes a slider 60 that moves in the X direction, and a flexible and extendable bellows cylinder 62 that connects the slider 60 and the wall surface 36c.

The slider 60 is a rounded box that is easy to operate at a position where the bottom is near the stepped surface 36a and the upper surface is appropriately higher than the operation surface of the operation unit 32. The slider 60 has a pusher detection switch (pushing detection unit) 64 provided at a position where the pusher flange 28 of the syringe 12 abuts on the connection surface 62a on the X1 direction side, and the pusher flange 28 contacts the connection surface 62a. A pair of levers 66 that are fixed in contact with each other, an arcuate support base 68 that is provided on the connection surface 62a and supports the pusher flange 28, and a lock lever 70 that fixes and releases the slider 60 in the sliding direction. Have.

The slider 60 has a function of holding the pusher flange 28 of the pusher 16 in the placed syringe 12 with a lever 66 and pushing out the pusher 16. The pusher detection switch 64 is turned on when the pusher flange 28 comes into contact therewith.

The lock lever 70 protrudes from the side surface of the slider 60 to the near side when not operated, and allows the slider 60 to be manually slid in the X direction by fixing the slider 60 and pressing it elastically. The operation state of the lock lever 70 is detected by a lock sensor 138.

The pair of levers 66 has an inward arc shape that is symmetrical with respect to the axis of the syringe 12, and is tilted about the lower shafts 66 a in conjunction with pushing the lock lever 70 so as to be separated from each other. The two sides of the pusher flange 28 can be gripped by elastically closing in conjunction with opening and releasing the lock lever 70. The lever 66 holds the outer peripheral surface of the pusher flange 28 and the surface on the X2 direction side, and can prevent the pusher flange 28 from coming off the slider 60. The pusher flange 28 is held and stabilized at three locations of the pair of levers 66 and the support base 68.

A slider confirmation LED 72 is provided on the upper surface of the slider 60. When the slider 60 is moved manually, the pusher flange 28 comes into contact with the side surface thereof, the pusher detection switch 64 is turned on, the lock lever 70 is released, and the lever 66 is fixed to the slider 60. When it is determined that the slider 60 is fixed, the slider confirmation LED 72 changes from the blinking state to the unlit state.

The slider 60 is provided in the bellows cylinder 62 in a state in which the clamp confirmation LED 58 and the slider confirmation LED 72 are turned off (that is, a state in which the syringe 12 is accurately placed; hereinafter referred to as a normal syringe placement state). Further, the drive rod 63 (see FIG. 5) can be automatically advanced in the X1 direction by the retraction operation.

The drive rod 63 determines the retraction speed based on the liquid feeding amount set by the setting dial 86 and the type of the syringe 12 detected by the clamp 50, and pushes the pusher 16 while accurately controlling the speed. Pump the solution.

The operation unit 32 includes a power switch 80, a green external power lamp 82, and a red battery lamp 84 regarding the power function. The external power lamp 82 is turned on when the external power source detecting unit 125 (see FIG. 5) determines that an external power source is connected to the power outlet 39. The battery lamp 84 blinks when the remaining charge of the lithium ion battery (secondary battery) 122 (also referred to as SOC (State of charge)) decreases. When the remaining amount of charge of the lithium ion battery 122 decreases, a warning by the buzzer 144 and a character display by the liquid crystal monitor 102 are also performed. The remaining charge amount of the lithium ion battery 122 is detected by a predetermined charge amount detection sensor 151 (see FIG. 5). By operating the power switch 80, the internal main contactor 152 (see FIG. 5) is turned on, and the power supply of the syringe pump 10 as a whole is turned on.

The operation unit 32 includes a setting dial 86 and a set liquid supply amount display unit 88 regarding the operation of the liquid supply amount. The setting dial 86 is rotatably arranged in the bottomed dial arrangement hole 91 on the side surface in the longitudinal direction of the syringe pump 10, and the side surface is exposed.

The dial arrangement hole 91 has a vertically long cutout portion 91a that exposes an upper portion of the setting dial 86 on the upper surface, and a tapered side recess portion 91b that has a predetermined width that widens toward the outer diameter side in the opening direction. In the setting dial 86, a dial rotation sensor 150 (see FIG. 5) in the main body reacts to a magnetic body provided in the setting dial 86 by rotating a portion exposed from the side surface or the vertically cutout portion 91a with a finger. Thus, the rotation direction and the rotation amount can be detected. The dial rotation sensor 150 is, for example, a hall element. The setting dial 86 can be rotated endlessly. The polarity of increase / decrease in the amount of liquid delivered by the setting dial 86 is positive in the upper direction (clockwise in a side view) and negative in the lower direction (counterclockwise in a side view), as indicated by a nearby polarity display symbol 87. The polarity display is also provided on the side surface of the main body (see FIG. 3). The liquid feeding amount set by the setting dial 86 may be recorded in the nonvolatile memory 116 and held even after the power is turned off.

The set liquid supply amount display unit 88 is provided with five 7-segment LEDs, and displays the set liquid supply amount [mL / h] set by the setting dial 86 with a maximum of five digits. The set liquid supply amount display unit 88 includes a four-digit integer part 88a that lights in green, a one-digit decimal part 88b that lights in red, and a red decimal point LED 88c arranged therebetween. The decimal part 88b is slightly smaller than the integer part 88a. According to such a configuration, the confirmation of the digit is further facilitated by the difference in color and size and the indication of the decimal point. In particular, since the decimal part 88b and the decimal point LED 88c are displayed in red having a warning effect, it is emphasized that the part indicated by these is a part related to the decimal, and the confirmation of the digit becomes easy. The set liquid supply amount display section 88 is arranged in the vicinity of the setting dial 86, and the correspondence relationship is easily understood by the operator.

The operation unit 32 includes a start switch 90a, a stop switch 90b, and a fast-forward switch 90c for the liquid feeding operation. The start switch 90a is effective when the syringe is in a normal state.

The operation unit 32 includes an operation indicator 92, an occlusion pressure monitor 94, and a remaining amount detection LED 96 as a display unit related to the liquid feeding state.

The operation indicator 92 protrudes into a low truncated cone shape as a whole, and consists of four LEDs in a 90 ° section in plan view. Each LED is a two-color type that can be lit in red and green. The operation indicator 92 is an image in which the rotating body is rotating according to the liquid feeding state, and the four LEDs are green and repeatedly light up in order in the clockwise direction. The operation indicator 92 flashes red when various abnormalities are detected, such as when it is determined that the tube 22 is blocked. Since the operation indicator 92 has a protruding shape, it is excellent in visibility from the side as well as the upper side.

The occlusion pressure monitor 94 indicates the occlusion state of the tube 22 determined from the pressure generated in the syringe outer cylinder 18 by four lit

symbols

94a, 94b, 94c and 94d. The symbols 94a to 94d are arranged from the left to the right. When the pressure is sufficiently low, all of the symbols 94a to 94d are turned off, and the

symbols

94a, 94b, and 94c are turned on in order as the pressure increases. When the specified pressure is reached from the state in which the .about.94c is lit, it is determined that the tube 22 is blocked, and the symbol 94d is blinked in the state in which the symbols 94a to 94c are lit.

The remaining amount detection LED 96 blinks as an alarm when it is determined that the liquid remaining in the syringe 12 is low. What is necessary is just to obtain | require the residual liquid amount in a syringe from the position of the slider 60. FIG.

The operation unit 32 includes, as information input / output means 100, a liquid crystal monitor 102,

function switches

104a, 104b, 104c, and an integration clear switch 106.

The liquid crystal monitor 102 has a reasonably wide area suitable for visual recognition at a position with good visibility. The LCD monitor 102 is a dot matrix type and can display various symbols and character strings arbitrarily while being simple, inexpensive and power-saving. Of course, different types of languages can be displayed depending on the destination. is there. The liquid crystal monitor 102 has a horizontally long shape corresponding to the operation unit 32, for example, 240 × 64 dots and a shape of 99.5 mm × 28.0 mm. The liquid crystal monitor 102 has a backlight function that can be turned on / off in red and white.

The integration clear switch 106 is a switch for clearing the value of the liquid supply integration amount displayed on the liquid crystal monitor 102 at that time, and a line connecting the two is printed to clearly show the relationship with the liquid crystal monitor 102. Yes.

The function switches 104a to 104c are arranged at equal intervals on the lower side of the liquid crystal monitor 102, and correspond to three option displays displayed on the lower part of the liquid crystal monitor 102.

As shown in FIG. 5, the syringe pump 10 is a computer (control unit) 110 that performs overall control, and the computer 110 is a one-chip microcomputer, for example, a ROM 112, a RAM 114, a nonvolatile memory (flash memory). Etc.) 116 and a clock 118. The computer 110 has an interface (not shown), and performs input / output processing for each sensor, each switch, and each lamp described above. The clock 118 can be corrected at present by a predetermined operation, and can acquire the current time, measure the elapsed time of a predetermined work, measure the reference time of speed control, and the like.

The syringe pump 10 is supplied with alternating-current (or direct-current) external power, and is supplied with power from the power outlet 39 through the power supply unit 120 and can be supplied with power from the power outlet 39 through the power supply unit 120. A lithium ion battery (secondary battery) 122 and an external power source detection unit 125 that detects a connection state of the external power source to the power outlet 39 are included. The power supply unit 120 generates stable DC power from AC and supplies it to each unit. The lithium ion battery 122 can operate for a considerably long time. The power supply unit 120 does not need to be built in the syringe pump 10 and may be provided outside as a DC adapter, for example.

The computer 110 displays information for prompting the connection of the external power source on the liquid crystal monitor 102 when it is determined that the external power source is not connected based on the signal obtained from the external power source detection unit 125 (see FIG. 5). ) The external power lamp 82 is turned off.

In the syringe pump 10, the drive rod 63 that slides the slider 60 is driven by the motor 128 in the housing 11, and the drive amount is detected by the encoder 130. The drive current of the motor 128 is detected by the current sensor 132. The motor 128 is driven via the motor driver 134 under the action of the computer 110. The computer 110 detects the pressure applied to the slider 60 with a strain gauge and controls lighting of the operation indicator 92 and the occlusion pressure monitor 94.

The displacement amount of the elevating rod 52 is detected by the clamp sensor 136, the operation state of the lock lever 70 is detected by the lock sensor 138, and each signal is supplied to the computer 110 to fix the syringe outer cylinder 18 by the clamp 50 and the slider. 60 is determined to be fixed. In the computer 110, when it is determined that the detection switches 40a and 40b are turned on and the clamp 50 has fixed the syringe outer cylinder 18, the clamp confirmation LED 58 is turned off, the pusher detection switch 64 is turned on, and the slider 60 is fixed. When the determination is made, the slider confirmation LED 72 is turned off.

The computer 110 controls the display of the liquid crystal monitor (display unit) 102 via the liquid crystal driver 140 and turns on the backlight 142 at a predetermined timing. In addition to the liquid crystal monitor 102, a buzzer 144, a speaker 146, a communication port 148, and a nurse call output unit 149 are connected to the computer 110 as general-purpose output means. The communication port 148 can input / output information to / from a predetermined external computer. In the following description, the buzzer 144 is sounded acoustically as a predetermined alarm and warning, but a predetermined sound or voice guidance may be provided from the speaker 146.

Next, the operation of the liquid crystal monitor 102 in the syringe pump 10 configured as described above will be described. In the syringe pump according to the present embodiment, information that is detailed, diverse, and easy to understand for those unfamiliar with the operation can be displayed as symbols and character strings on the liquid crystal monitor 102 according to the operating state. (1) Display at the time of setting the syringe 12 to the syringe pump 10, (2) Display regarding the power supply state, (3) Display when alarm is generated, and (4) When performing the specified inspection operation The display can be suitably performed. First, the display at the time of operation which sets the syringe 12 with respect to the syringe pump 10 of (1) term is demonstrated.

When the operator activates the syringe pump 10 by pressing the power switch 80, the computer 110 prompts three operations for setting the syringe 12, performs a predetermined initial process, confirms each operation, and displays a confirmation result. The three operations for setting the syringe 12 are the following a operation, b operation and c operation as a general and preferable operation order (the a operation, b operation and c operation are names for convenience). The order of the three operations for setting the syringe 12 may be performed, for example, by reversing the b operation and the c operation.

As shown in FIG. 6, the a operation is an operation of placing the syringe outer cylinder 18 of the syringe 12 on the syringe placement portion 34 with the outer cylinder flange 20 aligned with the set groove 42.

As shown in FIG. 7, the operation b is an operation of sliding the slider 60 to an appropriate position, setting the pusher flange 28 on the slider 60 by the lever 66, and fixing the slider 60. Strictly speaking, the b operation includes an operation for setting the pusher flange 28 on the slider 60 and two operations for fixing the slider 60. From the viewpoint of the operator, only the operation of the lock lever 70 is performed. It is appropriate to classify.

As shown in FIG. 8, in the c operation, the clamp 50 is pulled up moderately, the rotation lever 54 is rotated 90 ° clockwise and then lowered, and the upper surface of the syringe outer cylinder 18 is pressed and fixed by the rotation lever 54. It is.

In the computer 110, until the syringe is normally placed, a display to be described later is displayed on the liquid crystal monitor 102, and the backlight 142 of the liquid crystal monitor 102 is alternately blinked in red and white, and the corresponding clamp confirmation LED 58 and slider are displayed. The confirmation LED 72 is blinked and the buzzer 144 is intermittently sounded to prompt the operator to set the syringe 12. The backlight 142 has a psychological alerting effect on the operator by lighting or blinking in red. When the backlight 142 is of the red type, simple flashing may be performed.

Next, the effect | action of the syringe pump 10 in a operation which sets the syringe 12 to the syringe mounting part 34 is demonstrated.

As shown in FIGS. 9 and 10, when the outer cylinder flange 20 of the syringe outer cylinder 18 is mounted in the set groove 42 so that the large diameter direction thereof is horizontal, the syringe outer cylinder 18 is curved at least at the lower end ridge line portion. The two

detection switches

40a and 40b are turned on by contacting the bottom of the portion 38. Thereby, the computer 110 determines that the syringe outer cylinder 18 is correctly placed on the syringe placement portion 34, adds the condition of the state of the clamp 50 judged by the clamp sensor 136, and turns off the clamp confirmation LED 58 ( Predetermined output). Of course, depending on the design conditions, the determination by the detection switches 40a and 40b and the determination by the clamp sensor 136 may be individually output and displayed.

As described above, the detection switch 40a and the detection switch 40b are set to have an axial interval of 5 mm to 10 mm in consideration of the standard thickness of the outer cylinder flange 20 so that both are not pushed by the outer cylinder flange 20. It is good to. Thereby, a necessary and sufficient interval is ensured.

As shown in FIG. 10, a pair of thin protrusions 44d arranged at symmetrical positions with respect to the center line C of the syringe 12 protrude from the upper part of the spring body 44 provided in the first groove wall 42a. Depending on the type of the syringe 12, the lowermost part of the cross-shaped rib 30 of the pusher 16 reaches below the uppermost part of the protrusion 44d, but the end 30a of the cross-shaped part of the rib 30 has two parts. Since it enters between the protrusions 44d, there is no interference. When placing the syringe 12 on the syringe placement portion 34, when the pusher 16 moves downward, if the end 30a comes into contact with one of the two protrusions 44d, a virtual line As shown, the end 30a can be passively rotationally displaced so that interference is avoided.

Next, a case will be described in which the outer cylinder flange 20 of the syringe outer cylinder 18 is to be placed in a state where it is shifted to the syringe placement part 34 side from the set groove 42.

As shown in FIG. 11, in this case, since the outer cylinder flange 20 abuts on a high portion of the bending portion 38, the syringe outer cylinder 18 does not abut on the bottom surface of the bending portion 38, and the detection switch Also do not touch 40a and 40b. That is, the syringe mounting portion 34 is provided with a curved portion 38 that forms a concave arc column surface at a location where at least two

detection switches

40a and 40b are provided, and the outer cylinder flange 20 is substantially elliptical. In this case, the outer cylinder flange 20 is brought into contact with the upper end part or the middle height part of the curved part 38, so that the syringe outer cylinder 18 is moved. There is no contact with the detection switches 40a and 40b.

Thereby, in the computer 110, since both the detection switches 40a and 40b are OFF, it is not erroneously determined that the syringe outer cylinder 18 is properly placed on the syringe placement portion 34, and the outer cylinder flange 20 Can be prevented from being improperly placed at the location of the bending portion 38 of the syringe placement portion 34 or the location of the

detection switches

40a, 40b.

Referring to FIG. 11, it is understood that if the detection switches 40a and 40b are arranged in the curved portion 38 of the circular arc column surface, erroneous mounting of the syringe outer cylinder 18 can be considerably prevented even if either one is omitted. It will be.

As shown in FIG. 12, when the outer diameter of the outer cylinder flange 20 is substantially horizontal and the larger diameter direction is substantially vertical (Z direction), the outer cylinder flange 20 has an upper end portion or a middle height portion of the curved portion 38. Without contacting the bottom of the curved portion 38. However, since the outer cylinder flange 20 is reasonably thin, it does not contact both of the detection switch 40a and the detection switch 40b, which are slightly separated in the axial direction, even if they contact either one. Therefore, in the computer 110, since at least one of the detection switches 40a and 40b is off, it is not erroneously determined that the syringe outer cylinder 18 is properly placed on the syringe placement portion 34, and the outer cylinder flange 20 Can be prevented from being improperly placed at the location of the bending portion 38 of the syringe placement portion 34 or the location of the

detection switches

40a, 40b.

As shown in FIG. 13, in the syringe mounting part 34, the location where the detection switches 40a and 40b are provided is a flat surface, and the large diameter direction of the outer cylinder flange 20 is substantially horizontal and the small diameter direction. Even when the computer 110 is placed in a substantially vertical state, the computer 110 does not make an erroneous determination. That is, since the portion in the small diameter direction of the outer cylinder flange 20 slightly protrudes from the side surface of the syringe outer cylinder 18, the outer cylinder flange 20 may contact either one of the detection switches 40a and 40b. This is because the side surface of the syringe outer cylinder 18 does not contact any of the detection switches 40a and 40b.

Even if only one of the detection switches 40a and 40b is provided on the bending portion 38, the outer cylinder flange 20 is placed so that the large diameter direction thereof is substantially horizontal. As is clear from FIG. 11, the

detection switch

40a or 40b is not turned on, and there is virtually no erroneous determination.

As described above, when the two

detection switches

40 a and 40 b are provided at different positions in the axial direction of the syringe 12, the syringe outer cylinder 18 can be appropriately placed on the syringe mounting portion 34, whereby the syringe outer cylinder The 18 cylinder surfaces act on both of the two

detection switches

40a and 40b, and the computer 110 can detect that the syringe outer cylinder 18 is properly placed.

In contrast, if the syringe outer cylinder 18 is placed improperly, even if the outer cylinder flange 20 acts on one of the detection switches 40a or 40b, the other is not affected. In 110, it can be detected that the syringe outer cylinder 18 is improperly placed.

The two

detection switches

40a and 40b are respectively provided in the syringe mounting part 34 with easy layout, and no switches are required in the set groove that is narrow and difficult to arrange and assemble the equipment.

Next, a case where the shortest syringe 12b is to be placed in a state where the outer cylinder flange 20 of the syringe outer cylinder 18 is shifted to the slider 60 side with respect to the set groove 42 will be described.

As shown in FIG. 14, when the outer cylinder flange 20 of the syringe outer cylinder 18 slightly protrudes to the slider 60 side from the set groove 42, the syringe outer cylinder 18 is correctly placed by visual confirmation by the operator. Although both of the detection switches 40a and 40b are off, the computer 110 can determine that the syringe outer cylinder 18 is not placed.

As shown in FIG. 15, the outer cylinder flange 20 of the syringe outer cylinder 18 protrudes considerably toward the slider 60 from the set groove 42, and the distal end portion 18 a of the syringe outer cylinder 18 has reached a predetermined position P. In this case, the detection switch 40b on the side close to the position P is turned on. However, the side surface of the syringe outer cylinder 18 is held at a slightly higher position by the protrusion 44d provided on the spring body 44, and the syringe outer cylinder 18 is allowed to have an appropriate inclination so that the portions other than the distal end portion 18a are floated from the syringe mounting surface. The detection switch 40a remains off. Therefore, the computer 110 can determine that the syringe outer cylinder 18 is not properly placed.

For this reason, by providing the protrusion (protrusion part) 44d, it is possible to omit the detection switch 40b and prevent the outer cylinder flange 20 from being erroneously attached even if only the detection switch 40a is provided.

At this time, the distance between the outer cylinder flange 20 and the second groove wall 42b of the set groove 42 is a sufficiently long distance L1 that can be easily identified visually. The angle of the presser 16 with respect to the standard placement angle is θ1 that can be easily identified visually.

When the syringe outer cylinder 18 is further shifted to the left in FIG. 15, both the detection switches 40a and 40b can be turned on. In this case, the second groove wall of the outer cylinder flange 20 and the set groove 42 is used. Since the distance to 42b exceeds L1 and can be easily identified visually, it is recognized that the placement is improper without needing to be judged by the computer 110.

Further, since the angle of the presser 16 with respect to the standard mounting angle exceeds θ1 and can be easily identified visually, it is recognized that the mounting is inappropriate without needing to be judged by the computer 110, and the angle θ1. In this state, since the pusher flange 28 of the pusher 16 is not set on the slider 60, liquid feeding is not performed with improper placement.

Of the detection switches 40a and 40b, at least the position of the detection switch 40a on the side close to the set groove 42 (the length M in the figure) is the axis from the end face of the first groove wall 42a constituting the slider 60 side in the set groove 42. It is good to provide in the range of 12 mm about a direction. Moreover, the height H of the protrusion 44d is preferably 2 mm or more from the bottom surface of the syringe placement portion 34. In this way, by setting the position of the detection switch 40a and the height of the protrusion 44d, it is necessary to determine whether the computer 110 is appropriate or not when the outer cylinder flange 20 protrudes beyond the set groove 42 toward the slider 60. When this is done, the angle θ1 becomes reasonably large, and the detection switch 40a can be turned off. The lower limit value of the length M and the upper limit value of the height H are set within a reasonable range of design conditions.

As shown in FIG. 16, the interval W between the two protrusions 44d is desirably narrow enough to support the syringe outer cylinder 18 at a sufficiently lower portion, and may be set to 5 mm or less. The interval W may be set to 3 mm or more in consideration of the thickness which varies depending on the manufacturer so as not to interfere with the end 30a (see FIG. 10) of the cross-shaped portion of the rib 30. Further, the two protrusions 44d are arranged at symmetrical positions with respect to the center line C of the syringe 12b, and can support the syringe outer cylinder 18 in a balanced manner.

As shown in FIG. 17, when the maximum length syringe 12a (or a syringe other than the shortest syringe 12b) is used and the tip 18a reaches the position P or is on the left side, Since the distance between the outer cylinder flange 20 and the second groove wall 42b of the set groove 42 is a sufficiently long distance L2 (> L1), it is improperly placed without being judged by the computer 110. It is recognized.

As described above, according to the two protrusions 44d, when the outer cylinder flange 20 protrudes beyond the set groove 42 toward the slider 60 and is improperly disposed, the syringe outer cylinder 18 is provided with an appropriate inclination θ1. Therefore, it is possible to prevent the detection switches 40a and 40b from being turned on by floating the parts other than the tip 18a from the syringe mounting surface. Further, since the two protrusions 44d are arranged at symmetrical positions with respect to the center line C of the syringe 12, it is possible to prevent interference with the cross-shaped rib 30 in the pusher 16.

Further, the two protrusions 44d are integrally provided on the spring body 44, and have a simple configuration.

Of course, the syringe pump according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

Claims

A syringe mounting section (34) for mounting the outer cylinder (18) of the syringe (12a);
A slider (60) that holds the pusher (16) of the mounted syringe (12a);
A set groove (42) provided adjacent to the syringe placement portion (34) and fitted with an outer cylinder flange (20) of the outer cylinder (18);
A plurality of outer cylinders disposed at different positions in the axial direction of the syringe (12a) placed on the syringe placement section (34) and pressed down when the syringe (12a) is placed A detector (40a, 40b);
When the plurality of outer cylinder detection units (40a, 40b) detect the outer cylinder (18), respectively, it is determined that the outer cylinder (18) is properly placed on the syringe placement part (34). A control unit (110);
A syringe pump (10) characterized by comprising:
The syringe pump (10) according to claim 1,
The syringe pump (10), wherein the plurality of outer cylinder detectors (40a, 40b) are arranged at intervals of 5 mm to 10 mm.
The syringe pump (10) according to claim 1 or 2,
The syringe mounting part (34) has a concave arc column surface with respect to the axial direction,
A plurality of said outer cylinder detection parts (40a, 40b) are arrange | positioned at the said circular-arc column surface, The syringe pump (10) characterized by the above-mentioned.
The syringe pump (10) according to any one of claims 1 to 3,
The set groove (42) is composed of a first groove wall (42a) that constitutes the slider (60) side and a second groove wall (42b) that constitutes the syringe mounting part (34) side. ,
The outer cylinder flange (20) provided in the first groove wall (42a) and mounted in the set groove (42) is pressed toward the syringe mounting portion (34), and the outer cylinder flange (20 ) Has a spring body (44) that makes contact with the second groove wall (42b).
The syringe pump (10) according to any one of claims 1 to 4,
The set groove (42) is composed of a first groove wall (42a) that constitutes the slider (60) side and a second groove wall (42b) that constitutes the syringe mounting part (34) side. ,
When the syringe (12a) is placed with the outer cylinder flange (20) over the first groove wall (42a), the outer cylinder (18a) is provided on the first groove wall (42a). A syringe pump (10), characterized by having a protrusion (44d) that abuts the contact portion.
The syringe pump (10) according to claim 5,
Two said protrusion parts (44d) are arrange | positioned in the symmetrical position on the basis of the centerline of the said syringe (12a), The syringe pump (10) characterized by the above-mentioned.
The syringe pump (10) according to any one of claims 1 to 3,
The set groove (42) is composed of a first groove wall (42a) that constitutes the slider (60) side and a second groove wall (42b) that constitutes the syringe mounting part (34) side. ,
The outer cylinder flange (20) provided in the first groove wall (42a) and mounted in the set groove (42) is pressed toward the syringe mounting portion (34), and the outer cylinder flange (20 ) In contact with the second groove wall (42b),
A protrusion (44d) that contacts the outer cylinder (18) when the syringe (12a) is placed in a state where the outer cylinder flange (20) exceeds the first groove wall (42a);
Have
The protrusion (44d) is provided at the upper end of the spring body (44), and is a syringe pump (10).
A syringe mounting section (34) for mounting the outer cylinder (18) of the syringe (12a);
A slider (60) that holds the pusher (16) of the mounted syringe (12a);
An outer cylinder detection unit (40a, 40b) disposed on the syringe mounting unit (34) and pressed down when the syringe (12a) is mounted;
A control unit that determines that the outer cylinder (18) is properly placed on the syringe placement part (34) by the outer cylinder detection part (40a, 40b) detecting the outer cylinder (18); ,
Have
The syringe mounting part (34) has a concave arc column surface with respect to the axial direction,
The syringe pump (10), wherein the outer cylinder detector (40a, 40b) is disposed on the circular arc column surface.
A syringe mounting section (34) for mounting the outer cylinder (18) of the syringe (12a);
A slider (60) that holds the pusher (16) of the mounted syringe (12a);
A set groove (42) provided adjacent to the syringe placement portion (34) and fitted with an outer cylinder flange (20) of the outer cylinder (18);
An outer cylinder detection unit (40a, 40b) disposed on the syringe mounting unit (34) and pressed down when the syringe (12a) is mounted;
A control unit that determines that the outer cylinder (18) is properly placed on the syringe placement part (34) by the outer cylinder detection part (40a, 40b) detecting the outer cylinder (18); ,
Have
The set groove (42) is composed of a first groove wall (42a) that constitutes the slider (60) side and a second groove wall (42b) that constitutes the syringe mounting part (34) side. ,
When the syringe (12a) is placed with the outer cylinder flange (20) over the first groove wall (42a), the outer cylinder (18a) is provided on the first groove wall (42a). A syringe pump (10), characterized by having a protrusion (44d) that abuts the contact portion.