WO2019014895A1 - Precise linkage structure and micro liquid injector using same - Google Patents

Abstract

Disclosed are a precise linkage structure and a micro liquid injector using the structure, the structure comprising a micro-drive assembly (2) and a worm gear assembly (1), wherein the worm gear assembly (1) comprises a worm (11) connected to the micro-drive assembly (2) and a worm wheel (12) engaged with the worm (11); and the micro-drive assembly (2) rotates under the drive of a power device (A), so as to drive the worm (11) to rotate, and then drive the worm wheel (12) to rotate. The precise linkage structure and the liquid injector using the structure can realize the micro and accurate supply of medicine liquid, and are especially suitable for application in an insulin pump.

Description

 Title of Invention: A Precision Linked Structure and a Micro Liquid Syringe Using the Structure

 [0001] The present invention relates to the field of medical accessories, and more particularly to a precision interlocking structure and a liquid injector to which the structure is applied.

 Background technique

 [0002] Some special occasions require sustained, controllable, precise, and extremely small amounts of medication, such as insulin, anesthetics, laboratory reagents, and the like. Often this continuous and controllable supply of precision liquids requires the integration of precision mechanical parts, electronic control parts, and liquid injectors. There are many integrated medical liquid supply devices, such as insulin pumps, anesthesia pumps, medical micro pumps, micro-injection pumps for experimental analysis, and micro sample pipetting pumps. These devices require a liquid syringe to store the drug solution.

 [0003] The existing liquid injector mainly uses a micro servo motor to achieve precise control, and has the following disadvantages: 1. The micro servo motor needs to be decelerated, and requires a precise micro speed reduction mechanism, resulting in high cost and large volume of the product. 2. The servo motor requires the driver and the controller to be used together to complete the control and drive, which complicates the control circuit and increases the cost of the product. 3. Because the micro servo motor is sensitive to electromagnetic interference, the external electromagnetic field is disturbed. , may cause the motor to operate incorrectly, with serious consequences.

 technical problem

 The present invention provides a precision interlocking structure and a micro-liquid injector using the same, which can overcome the defects of the prior art and can realize a micro-precise supply of the liquid medicine, and is particularly suitable for the application of the insulin pump.

 Problem solution

 Technical solution

 [0005] To achieve the above object, the solution of the present invention is:

 [0006] A precision interlocking structure comprising a micro-transmission assembly and a worm gear assembly, the worm gear assembly comprising a worm coupled to the micro-transmission assembly and a worm gear meshing with the worm, the micro-transmission assembly Rotating under the driving of the power device, thereby driving the worm to rotate, and then driving the worm wheel to rotate.

[0007] The above micro-transmission assembly is provided with two sets, which are respectively disposed at two ends of the worm. [0008] The micro-transmission assembly includes a swing lever, an active pawl and a micro-actuating ratchet; one end of the swing rod is connected to the power device, and the other end is matched with the worm; the one end of the active pawl is disposed on the swing rod The other end is opposite to the teeth of the micro-rotation ratchet, and the micro-actuating ratchet is fixed coaxially with the worm; the power device drives the swing rod to swing, and then the active pawl is linked to push the micro-actuating ratchet to rotate.

 [0009] The micro-transmission assembly described above further includes a spring piece, the spring piece being disposed at one end of the rocker and the other end abutting against the active pawl.

 [0010] The above-mentioned precision interlocking structure further includes a limiting component for defining an upper and lower limit position of the swing lever

[0011] The above-mentioned limiting component includes an upper limit rod disposed above the swing rod and a lower limit rod disposed below the swing rod.

[0012] The above-mentioned precision interlocking structure further includes a non-return pawl, and the non-return pawl also abuts between the ratchet teeth of the micro-actuating ratchet and the orientation and orientation of the non-returning pawl The active pawl is reversed.

 [0013] A micro liquid injector comprising a liquid injection assembly and the above-mentioned precision interlocking structure, the liquid injection assembly comprising a syringe assembly, a liquid injection screw shaft and a liquid injection piston; the liquid injection screw shaft, a liquid injection piston and a precision interlocking structure are disposed in the syringe assembly; the injection screw shaft is provided with an external thread; and the liquid injection screw shaft is pushed by the precision linkage structure Next, the liquid injection screw is driven to move axially downward, and the liquid medicine is extruded from the lower end of the syringe assembly through the liquid injection piston.

 [0014] The external thread on the liquid injection screw shaft meshes with the internal thread on the liquid injection piston shaft.

 [0015] The liquid injection piston described above is provided with a sealing ring for preventing liquid leakage.

 [0016] The lower end of the liquid injection screw shaft is provided with a step, and the lower end of the syringe assembly is provided with a split projection that cooperates with the step.

 [0017] The above-mentioned micro liquid injector further includes a sleeve, the sleeve is fixed with the worm wheel of the precise interlocking structure, and the sleeve is opposite to the liquid injection screw shaft Cooperating, injecting the cymbal, the sleeve rotates together with the worm wheel to drive the liquid injection screw shaft to rotate.

 [0018] The center of the sleeve is provided with a square hole, and the upper end of the liquid injection screw shaft is formed into a square handle that cooperates with the square hole.

[0019] The above-mentioned micro-liquid injector further includes a sleeve, the sleeve center is provided with a threaded hole, and the external thread of the liquid injection screw shaft is opposite to the threaded hole in the center of the sleeve Engaged, the lower end of the liquid injection screw shaft abuts against the piston. [0020] The above-mentioned micro liquid injector further includes a gasket, and the gasket is disposed between the liquid injection screw shaft and the piston.

 [0021] Preferably, the above-mentioned syringe assembly includes a syringe body and a linkage box, and the liquid is installed in the syringe body, and the precision linkage structure according to any one of claims 1-7 is installed. It is arranged in the linkage box.

 [0022] The interlocking box body includes a bottom plate, a top plate, a front side plate and a rear side plate; the bottom plate is connected to the syringe body, the bottom plate is provided with a hole, and the worm wheel is disposed on the bottom plate; The two ends of the shaft of the worm are respectively mounted on the front and rear side plates, and the check pawls are also mounted on the bottom plate.

 [0023] A micro liquid injector as described above, further comprising a reset assembly for returning the injection screw shaft to the position, wherein the reset assembly is mounted on the top plate.

 [0024] The reset component includes: a reset lever and a reset motor; the reset lever cooperates with the liquid injection screw shaft, the reset motor rotates with the reset lever, and the reset lever drives the The injection screw shaft rotates.

 [0025] The reset rod is formed into a rod having a square cross section, and the liquid injection screw shaft is provided with a square hole matched with the shape of the reset rod, and the reset rod is inserted into the square hole. .

 Preferably, the resetting assembly further includes a reduction gear assembly, and the reset motor drives the reset lever to rotate through the reduction gear assembly.

 Advantageous effects of the invention

 Beneficial effect

 [0027] After adopting the above technical solution, in the use of the cymbal, the present invention reduces the rotational speed and increases the torque through the cooperation relationship of the swing lever, the active pawl, the micro-actuating ratchet, the worm and the worm wheel, and forms the secondary reduction transmission. In order to achieve a small and precise amplitude of each revolution of the worm wheel, the liquid injector can realize a precise supply of the liquid medicine, and is particularly suitable for the application of the insulin pump.

 Brief description of the drawing

 DRAWINGS

 1 is a schematic structural view 1 of a precision interlocking structure of the present invention;

 2 is a schematic structural view 2 of the precision interlocking structure of the present invention;

 3 is a schematic structural view of Embodiment 1 of the micro liquid injector of the present invention;

Figure 4 is a schematic cross-sectional view of Figure 3; 5 is a schematic structural view of a second embodiment of the micro liquid injector of the present invention;

6 is a schematic structural view of a third embodiment of the micro liquid injector of the present invention.

 BEST MODE FOR CARRYING OUT THE INVENTION

 BEST MODE FOR CARRYING OUT THE INVENTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Embodiment 1:

 Referring to Figures 1 and 2, the present invention discloses a precision interlocking structure comprising a worm gear assembly 1, a micro-transmission assembly 2, a limit assembly 3 and a check pawl 4, wherein:

[0037] The worm gear assembly includes a worm 11 and a worm gear 12 that meshes with the worm 11.

 [0038] The micro-transmission assembly includes a swinging rod 21, an active pawl 22, a micro-actuating ratchet 23, and a spring piece 24; the swinging rod 21-end is connected to the power unit A, and the other end is in clearance with the worm 11; the active pawl 22 The end is disposed on the swinging rod 21, and the other end is abutted between the teeth of the micro-rotating ratchet 23, and the micro-rotating ratchet 23 is coaxially fixed with the worm 11; the elastic piece 24-end is disposed on the swinging rod 21, and the other end is abutted against the active pawl On the 22nd, the spring 24 provides a continuous force to the active pawl 22 to ensure contact of the active pawl 22 with the ratchet on the ratchet 23.

 [0039] The output end of the power unit A is connected to the interlocking swing rod 21 of the precision interlocking structure; the power unit A may be driven by a memory alloy, a motor/cam drive, or other linear motor drive.

 [0040]

 [0041] As shown in FIG. 2, the micro-transmission assembly is provided with two sets, which are respectively disposed at two ends of the worm 12. It makes the drive smoother.

 [0042] a limiting component for defining an upper and lower limit position of the swinging rod 21. In the embodiment, the limiting component includes an upper limit position bar 31 disposed above the swinging bar 21 and a lower limit position disposed below the swinging bar 21 Rod 32.

[0043] The check pawl 4 is opposed to the ratchet of the micro-runner ratchet 23, and the direction of the check pawl 4 is opposite to that of the active pawl 22.

[0044] Using the cymbal, the power device A drives the swing lever 21 to swing, and then the active pawl 22 is driven to push the micro-actuating ratchet 23 to rotate; thereby driving the worm 11 fixed coaxially with the micro-actuating ratchet 23, and the worm 11 drives the meshing member 11 The worm wheel 12 rotates. According to the present invention, the rotation speed is increased and the torque is increased by the cooperation relationship of the swing lever 21, the active pawl 22, the micro-rotation ratchet 23, the worm 11 and the worm wheel 12, and the secondary reduction drive is formed to realize the final worm gear 12 The amplitude of each rotation is small and precise. [0045] Embodiment 2:

 Referring to FIG. 3, the present invention discloses a microfluidic liquid injector, a liquid injection assembly thereof and the above-described precision interlocking structure, wherein:

 [0047] The liquid injection assembly includes a syringe assembly, a liquid injection screw shaft 6, a liquid injection piston 7 and a sealing ring 8; the liquid injection screw shaft 6, the liquid injection piston 7 and the precision interlocking structure are all disposed in the syringe assembly 5 .

[0048] As shown in FIG. 6, the syringe assembly includes a syringe body 51 and a linkage housing 52. The liquid is disposed in the syringe body 51, and the precise interlocking structure is disposed in the linkage housing 52. Inside.

[0049] The interlocking box body 52 includes a bottom plate 521, a top plate 522, a front side plate 523 and a rear side plate 524; the bottom plate 521 is connected to the syringe body 51, the bottom plate 521 is provided with a hole 5211, the worm wheel 12 is disposed on the bottom plate 521; Both ends of the shaft of the worm 11 are respectively attached to the front and rear side plates 523 and 524, and the check pawls 4 are also mounted on the bottom plate 521.

[0050] The liquid injection screw shaft 6 is provided with an external thread; the center of the liquid injection piston 7 is provided with an internal thread that meshes with the external thread of the liquid injection screw shaft 6, and the upper end 61 of the liquid injection screw shaft 6 is connected with the worm wheel 12; The liquid piston 7 is disposed in the syringe body 51 and is in sealing contact with the inner wall of the syringe body 51.

[0051] A seal ring 71 is provided in the liquid injection piston 7 for preventing leakage of the chemical liquid from the threaded joint.

Referring to FIG. 4, in the present embodiment, the lower end of the liquid injection screw shaft 6 is provided with a step 62, and the lower end of the syringe body 51 is provided with a split projection 511 which cooperates with the step 62. The arrangement of the step 62 and the split projection 511 ensures that the liquid injection screw shaft 6 is at the center of the syringe body 51.

[0053] Using 吋, the worm wheel 12 of the precise interlocking structure rotates, and the liquid injection screw shaft 6 is rotated. When the liquid injection screw shaft 6 rotates, the liquid injection piston 7 is pushed downward to move the liquid medicine from the syringe body. The lower end of the 51 is extruded.

 [0054] Embodiment 3:

 Referring to FIG. 5, another embodiment of a microfluidic liquid injector is disclosed which differs from the second embodiment in that:

[0056] The utility model further comprises a sleeve 8 , which is assembled, and one end of the sleeve 8 passes through a hole 5211 in the bottom plate 521 , and the worm wheel 12 is sleeved at one end of the sleeve 8 to form a combination with the sleeve 8 , the sleeve The combination of 8 and worm gear 12 can rotate in bore 5211 but cannot move up and down. The center of the sleeve 8 is provided with a square hole 81. The upper end of the liquid injection screw shaft 6 is formed into a square handle 61 matched with the square hole, and the square structure is arranged, so that the sleeve 8 can rotate the injection screw shaft. [0057] Using the cymbal, the oscillating lever 21 is swung by the power device, so that the worm gear 11 and the worm wheel 12 are rotated by the micro-rotation ratchet 23, and then the rivet 12 is driven to rotate by the worm wheel 12, thereby driving the liquid injection screw When the shaft 6 rotates, the liquid injection piston 7 is pushed downward to push the liquid medicine out from the lower end of the syringe body 51, so that the movement of the medicine bag piston and the supply of the chemical liquid can be realized.

 In addition, in the present embodiment, for example, the gear number N of the wheel spine 23, the number of teeth of the worm wheel 12 is M, and the worm 11 is a single-head screw. If the swing lever 21 pushes a ratchet motion each time, the worm wheel 12 The angle of rotation of the combination with the sleeve 8 is

ω=360 Μ·Ν. If the pitch of the screw of the liquid injection screw shaft 6 is Τ, the swing lever 21 advances by a distance of _{8 =} Τ·ω/360 for each swing of the swing lever 21.

[0059] For example, the number of teeth of the ratchet 23 is Ν=30, the number of teeth of the worm wheel 13 is 48=48, the worm 11 is a single-headed screw, and the swing lever 21 pushes a ratchet motion each time, and the swing lever 21 swings once, which will push the worm wheel. 12 turns 0.25°. If the pitch of the liquid injection screw shaft 6 is 0.5 mm, the piston 7 will advance by about 0.0035 mm every time the pendulum rod 21 moves once.

 [0060] Embodiment 4:

 [0061] Referring to FIG. 6, a further embodiment of a microfluidic liquid injector is disclosed, which differs from the second embodiment in that:

 [0062] It further includes a sleeve 8, a reset assembly 9, and a reduction gear assembly 10, wherein:

[0063] As shown in the assembly, one end of the sleeve 8 passes through a hole 5211 in the bottom plate 521, and the worm wheel 12 is sleeved at one end of the sleeve 8 to form a combination with the sleeve 8. The combination of the sleeve 8 and the worm wheel 12 can be Rotate in the hole 5211 but cannot move up and down. The center of the sleeve 8 is provided with a threaded hole 82 which meshes with the external thread of the liquid injection screw shaft 6, and the lower end of the liquid injection screw shaft 6 abuts against the liquid injection piston 7. In a specific implementation, a gasket 72 may be provided between the liquid injection screw shaft 6 and the liquid injection piston 7.

 [0064] The liquid injection screw shaft 6 is formed into a hollow screw, and a through hole 63 having a square cross section is formed in the center.

[0065] The resetting assembly 9 includes: a reset lever 91 and a reset motor 92; the reset lever 91 is formed as a rod having a square cross section, the reset lever 91 is engaged with the through hole 63 provided in the liquid injection screw shaft 6, and the reset lever 91 is inserted. In the square through hole 63

[0066] The reduction gear assembly 10 includes a driving gear 101 and a driven gear 102 that mesh with each other; the driving gear 101 is coupled to the reset motor 92. The driven gear 102 is mounted on the upper end of the reset lever 91. [0067] The reset assembly 9 and the reduction gear assembly 10 are both mounted on the top plate 522 of the interlocking case 52.

[0068] In operation, the resetting assembly 9 is in a stopped state, the swing of the swinging lever 21 pushes the micro-actuating ratchet 23 to rotate by the active pawl 22, and the worm 11 is driven to rotate. Since the worm 11 meshes with the worm wheel 12, the worm wheel 12 and the shaft The sleeve 8 is fixedly connected, so that as the swinging lever 21 swings, the sleeve 8 is driven to rotate by a certain angle. Since the threaded hole 82 at the center of the sleeve 8 is engaged with the liquid injection screw shaft 6, and the center of the liquid injection screw shaft 6 is provided with a through hole 63 having a square cross section, the square-shaped return rod 91 and the through hole 63 are clearance-fitted, so that the injection is made. The liquid screw shaft 6 cannot rotate, so that when the sleeve 8 rotates, the liquid injection screw shaft 6 will be moved downward, and the sac piston 7 is pushed downward by the spacer 72 to squeeze out the liquid medicine, thereby realizing the medicine. A precise supply of liquid. After the end of the administration, the swing lever 21 will be in a stopped state, the reset motor 92 will rotate, and the drive gear 101 is fixedly coupled to the shaft of the motor 25, and the same as the driven gear 102, the driven gear 102 is fixedly mounted. The upper end of the reset lever 91 of the square cross section, thus the rotation of the reset motor 92, rotates the reset lever 91 that drives the square cross section. Further, since the square section shaft 22 is clearance-fitted with the square hole through hole 1801 of the hollow screw 18, the rotation of the reset shaft 91 of the square section drives the liquid injection screw shaft 6 to rotate at the same time. Since the liquid injection screw shaft 6 is engaged with the screw hole 82 of the sleeve 8, the liquid injection screw shaft 6 moves upward as the reset motor 92 rotates, thereby realizing the reset of the chemical supply mechanism.

The above embodiments are intended to be illustrative only and not to limit the invention, and the equivalents and modifications of the methods of the present invention are included in the scope of the present invention.

Claims

Claim  [Claim 1] A precision interlocking structure, comprising: a micro-transmission assembly and a worm gear assembly, the worm gear assembly comprising a worm coupled to the micro-transmission assembly and a worm gear meshing with the worm The micro-transmission assembly is rotated by the power unit to drive the worm to rotate, and then the worm wheel is rotated.  [Claim 2] A precision interlocking structure according to claim 1, wherein the micro-transmission assembly is provided with two sets, which are respectively disposed at two ends of the worm.  [Claim 3] A precision interlocking structure according to claim 1 or 2, wherein: the micro-transmission assembly includes a swing lever, an active pawl and a micro-actuating ratchet; The power device is connected, and the other end is matched with the worm gear; the active pawl is disposed at one end of the swinging bar, and the other end is abutted between the teeth of the micro-rotating ratchet, and the micro-actuating ratchet is coaxially fixed with the worm; The swinging lever swings, which in turn interlocks the active pawl to push the micro-actuating ratchet to rotate.  [Claim 4] A precision interlocking structure according to claim 3, wherein: the micro-transmission assembly further includes a spring piece, and one end of the elastic piece is disposed on the swing rod The other end is placed against the active pawl.  [Claim 5] A precision interlocking structure according to claim 4, further comprising a limit member for defining an upper and lower limit position of the swing link.  [Claim 6] A precision interlocking structure according to claim 5, wherein: the limiting component comprises an upper limit rod disposed above the swing rod and a lower limit rod disposed below the swing rod.  [Claim 7] A precision interlocking structure according to claim 3, further comprising: a check pawl, the check pawl also opposing the ratchet of the micro-rotation ratchet The direction of the non-return pawl is opposite to the active pawl. [Claim 8] A micro-liquid injector, comprising: a liquid injection assembly and the precision interlocking structure according to any one of claims 1 to 7, wherein the liquid injection assembly comprises a syringe assembly and a liquid injection screw a shaft and a liquid injection piston; the liquid injection screw shaft, the liquid injection piston and the precision interlocking structure are all disposed in the syringe assembly; the injection screw shaft is provided with an external thread; The liquid injection screw shaft drives the liquid injection screw to move axially downward under the pushing of the precision interlocking structure, and the liquid medicine is squeezed from the lower end of the syringe assembly through the liquid injection piston. Out [Claim 9] A micro liquid injector according to claim 8, wherein: the external thread on the screw shaft of the liquid injection meshes with the internal thread on the shaft of the liquid injection piston. [Claim 10] A micro-liquid injector according to claim 9, wherein: the liquid-filling piston is provided with a seal preventing liquid leakage. [Claim 11] The micro liquid injector according to claim 8, wherein: the lower end of the liquid injection screw shaft is provided with a step, and the lower end of the syringe assembly is provided with the step Fitted lobes  [Claim 12] A micro liquid injector according to any one of claims 8-11, further comprising: a sleeve, the sleeve and the worm wheel of the precision interlocking structure The sleeve is matched with the liquid injection screw shaft, and the sleeve is rotated together, and the sleeve rotates together with the worm wheel to drive the liquid injection screw shaft to rotate. [Claim 13] A micro liquid injector according to claim 12, wherein: the center of the sleeve is provided with a square hole, and the upper end of the liquid injection screw shaft is shaped to be square with the square hole Fitted square handle.  [Claim 14] A micro liquid injector according to claim 8, further comprising: a sleeve, the sleeve center is provided with a threaded hole, and the external thread of the liquid injection screw shaft Engaging with the threaded hole in the center of the sleeve, the lower end of the liquid injection screw shaft abuts against the piston.  [Claim 15] A micro-liquid injector according to claim 14, further comprising a spacer, the spacer being disposed between the liquid injection screw shaft and the piston.  [Claim 16] A micro-liquid injector according to claim 8, wherein: the syringe assembly includes a syringe body and a linkage housing, and a liquid is mounted on the syringe body The precision interlocking structure according to any one of claims 1 to 7 is installed in the linkage box [Claim 17] A micro liquid injector according to claim 16, wherein: the interlocking case comprises a bottom plate, a top plate, a front side plate and a rear side plate; the bottom plate and the syringe body Connected, the bottom plate is provided with a hole, and the worm wheel is disposed on the bottom plate; Both ends of the shaft of the rod are respectively installed on the front and rear side plates, and the check pawls are also mounted on the bottom plate.  [Claim 18] A micro liquid injector according to claim 17, further comprising: a resetting assembly for returning said liquid injection screw shaft to said position, said resetting assembly being mounted on said On the top plate.  [Claim 19] A micro liquid injector according to claim 18, wherein: said resetting assembly comprises: a reset lever and a reset motor; said reset lever is coupled to said liquid injection screw shaft The reset motor rotates with the reset rod, and the reset rod drives the liquid injection screw shaft to rotate.  [Claim 20] A micro liquid injector according to claim 19, wherein: the reset rod is formed into a rod having a square cross section, and the liquid injection screw shaft is provided with a shape of the reset rod The mating square holes are inserted into the square holes.  [Claim 21] A micro liquid injector according to claim 20, wherein: said resetting assembly further comprises a reduction gear assembly, said reset motor driving said resetting through said reduction gear assembly The rod rotates.