CN110124158B - Reset assembly for syringe - Google Patents

Abstract

The invention relates to the technical field of syringes, in particular to a resetting component of a syringe, which comprises: resetting the core bar; a reset cylinder having an inner cavity for containing a fluid medium; resetting the piston; when the piston of the injector needs to be reset, the reset core rod is firstly moved downwards, so that the fluid medium in the inner cavity pushes the reset cylinder barrel to move upwards, then the reset core rod is inserted into the injector to be in contact with the piston, the injector is fixed relative to the reset assembly, and then the piston can be jacked upwards by the reset core rod only by pushing the reset cylinder barrel downwards, so that the piston is reset, and a certain distance is kept between the piston and the push rod after each injection, so that the piston impacts the push rod to form injection, and the liquid medicine in the same needle cylinder can be quantitatively injected for a plurality of times.

Description

Syringe reset component

Technical field

The invention relates to the technical field of syringes, and in particular to a reset assembly of a syringe.

Background technique

Existing pen-type needleless syringes usually include a piston assembly and a medicine core assembly. When used, the fluid medium pushes the piston in the piston assembly to hit the push rod in the medicine core assembly, and the push rod pushes the medicinal liquid in the syringe from the syringe. The injection hole fires out to form a high-pressure jet for injection. During the quantitative injection process of the syringe, the patient needs to reset the syringe after each quantitative injection using the syringe in preparation for the next quantitative injection. Currently, there are about syringes on the market. A separate tool for reset has not yet emerged, and the present invention aims to solve this problem.

Contents of the invention

The technical problem to be solved by the present invention is to solve the problem in the prior art that the piston of the needleless syringe cannot perform a quantitative stroke retreat after one injection, resulting in the inability to carry out multiple quantitative injections of the medicinal liquid in the same syringe. , now provides a reset component for a syringe.

The technical solution adopted by the present invention to solve the technical problem is: a reset assembly of a syringe, which includes:

Reset core rod, used to push the piston of the syringe to reset;

The reset cylinder has an inner cavity for accommodating fluid medium, and the reset core rod is slidably arranged at the upper end of the inner cavity;

A reset piston is inserted into the lower end of the inner cavity, and the inner cavity is slidingly connected to the reset piston;

and a base, the reset piston is fixed on the base, the inner cavity is filled with fluid medium between the reset core rod and the reset piston, and the inner cavity has a fluid medium for pushing the reset cylinder upward along the reset piston. The moving force-bearing surface, when the reset core rod pushes the fluid medium downward, the fluid medium pushes the reset cylinder barrel upward along the reset piston from the force-bearing surface of the inner cavity; when the reset cylinder barrel pushes the fluid medium downward, the fluid medium moves from The bottom of the reset core rod pushes the reset core rod to move upward along the inner cavity.

In this solution, when the piston of the syringe needs to be reset, the reset core rod is first moved downward, so that the fluid medium in the inner cavity pushes the reset cylinder upward, and then the reset core rod is inserted into the interior of the syringe so that it contacts the piston, and Fix the syringe relative to the reset component, and then just press the reset cylinder downward, and the reset core rod will push the piston upward to reset the piston; the downward stroke of the reset cylinder is controlled to control the reset core The upward stroke of the rod.

Further, the upper section of the inner cavity is thinner and the lower section is thicker. A step surface is formed between the thick section and the thin section of the inner cavity. The step surface is the force-bearing surface. The reset core rod is slidably arranged in the inner cavity. In the thin section, the reset piston is slidably arranged in the thick section of the inner cavity.

Further, a sealing ring is provided between the reset core rod and the inner cavity, and a sealing ring is also provided between the reset piston and the inner cavity.

In order to accurately control the upward movement of the reset core rod, further, a reset sleeve is provided outside the reset cylinder, and the reset sleeve is rotated on the base, and an adjustment sleeve is drivingly connected to the reset sleeve, so The adjusting sleeve is located below the reset cylinder. When the reset sleeve is rotated, the adjusting sleeve moves closer or farther away from the reset cylinder. By changing the distance between the adjusting sleeve and the reset cylinder, the reset cylinder at the highest point of the stroke is lowered. The stroke of the shift is quantitative, that is, when the reset cylinder moves downward and is blocked by the adjusting sleeve, the reset cylinder is at the lowest point of the stroke. By determining the stroke of the reset cylinder, the stroke of the reset core rod can also be determined.

Further, the inner wall of the reset sleeve is threadedly connected to the outer wall of the adjustment sleeve, and a guide rod is fixed on the base. The guide rod passes through the adjustment sleeve and is slidingly connected with the adjustment sleeve.

Further, the reset cylinder is provided with a guide hole, and the guide rod is slidably connected in the guide hole.

Further, the bottom of the reset rotary sleeve has a bottom edge extending outward, a pressure plate is fixed on the base through screws, the pressure plate is limited above the bottom edge, and the base holds the reset rotary sleeve.

In order to prevent the reset cylinder from sliding off the reset piston, further, an annular protrusion is provided on the outer peripheral surface of the reset cylinder, and a limiting surface is provided on the inner wall of the reset sleeve. The limiting surface is located on the annular protrusion. Right above it.

In order to make it easier to clearly grasp the downward stroke of the reset cylinder after adjustment during operation, further, a length scale mark is provided on the outer wall of the reset cylinder.

The beneficial effects of the present invention are: when the piston of the syringe needs to be reset, the reset assembly of the syringe of the present invention first moves the reset core rod downward, so that the fluid medium in the inner cavity pushes the reset cylinder to move upward, and then inserts the reset core rod into The inside of the syringe is brought into contact with the piston, and the syringe is fixed relative to the reset assembly. Then, just press the reset cylinder downward, and the reset core rod will push the piston upward to reset the piston, thus achieving the goal of resetting the piston every time. After injection, the piston is retreated to maintain a certain distance from the push rod so that the piston hits the push rod to form an injection, thereby enabling multiple quantitative injections of the medicinal liquid in the same syringe.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples.

Figure 1 is a three-dimensional schematic diagram of the reset assembly of the syringe of the present invention;

Figure 2 is a schematic cross-sectional view of the reset core rod of the reset assembly of the syringe of the present invention moving downward;

Figure 3 is a partially enlarged schematic diagram of A in Figure 2;

Figure 4 is a partially enlarged schematic diagram of B in Figure 2;

Figure 5 is a schematic cross-sectional view of the reset core rod of the reset assembly of the syringe of the present invention moving upward.

In the picture: 1. Reset core rod, 2. Reset cylinder, 2-1, inner cavity, 2-11, thin section, 2-12, thick section, 2-13, stress surface, 2-2, guide hole , 2-3. Annular protrusion, 3. Reset piston, 4. Base, 5. Seal ring, 6. Reset sleeve, 6-1. Bottom edge, 6-2. Limiting surface, 7. Adjustment sleeve, 8 , guide rod, 9. screw, 10. pressure plate, 11. length scale mark.

Detailed ways

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner. Therefore, they only show the components related to the present invention. The directions and references (for example, up, down, left, right, etc.) may only be Used to assist in the description of features in the drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

Example 1

As shown in Figure 1-5, a reset component of a syringe includes:

Reset core rod 1, used to push the piston of the syringe to reset;

The reset cylinder 2 has an inner cavity 2-1 for accommodating fluid medium, and the reset core rod 1 is slidably arranged at the upper end of the inner cavity 2-1;

The reset piston 3 is inserted at the lower end of the inner cavity 2-1, and the inner cavity 2-1 is slidingly connected to the reset piston 3;

And the base 4, the reset piston 3 is fixed on the base 4, the inner cavity 2-1 is filled with fluid medium between the reset core rod 1 and the reset piston 3, and the inner cavity 2-1 has a removable The force-bearing surface 2-13 is used for the fluid medium to push the reset cylinder 2 to move upward along the reset piston 3. When the reset core rod 1 pushes the fluid medium downward, the fluid medium is pushed from the force-bearing surface 2-13 of the inner cavity 2-1. The reset cylinder 2 moves upward along the reset piston 3; when the reset cylinder 2 pushes the fluid medium downward, the fluid medium pushes the reset core rod 1 from the bottom of the reset core rod 1 to move upward along the inner cavity 2-1.

In specific implementation, the fluid medium may be gas or hydraulic oil.

A length scale mark 11 is provided on the outer wall of the reset cylinder 2 so that the downward movement stroke of the reset cylinder 2 after adjustment can be clearly grasped during operation.

The upper section of the inner cavity 2-1 is thin and the lower section is thick. A step surface is formed between the thick section 2-12 and the thin section 2-11 of the inner cavity 2-1. The step surface is the force-bearing surface 2- 13. The reset core rod 1 is slidably disposed in the thin section 2-11 of the inner cavity 2-1, and the reset piston 3 is slidably disposed in the thick section 2-12 of the inner cavity 2-1.

A sealing ring 5 is provided between the reset core rod 1 and the inner cavity 2-1, and a sealing ring 5 is also provided between the reset piston 3 and the inner cavity 2-1.

The reset cylinder 2 is provided with a reset sleeve 6, which is rotatably mounted on the base 4. An adjustment sleeve 7 is connected to the reset sleeve 6, and the adjustment sleeve 7 is located on the reset cylinder. 2 below, when the reset sleeve 6 is rotated, the adjustment sleeve 7 moves closer or farther away from the reset cylinder 2. By changing the distance between the adjustment sleeve 7 and the reset cylinder 2, the reset cylinder 2 at the highest point of the stroke moves down. The stroke of the shift is quantitative, that is, when the reset cylinder 2 moves downward and is blocked by the adjusting sleeve 7, the reset cylinder 2 is at the lowest point of the stroke. By determining the stroke of the reset cylinder 2, the stroke of the reset core rod 1 can also be determined.

The inner wall of the reset sleeve 6 is threadedly connected to the outer wall of the adjustment sleeve 7. A guide rod 8 is fixed on the base 4. The guide rod 8 passes through the adjustment sleeve 7 and is slidingly connected to the adjustment sleeve 7. The reset cylinder The barrel 2 is provided with a guide hole 2-2, and the guide rod 8 is slidably connected in the guide hole 2-2.

The bottom of the reset sleeve 6 has a bottom edge 6-1 extending outward. A pressure plate 10 is fixed on the base 4 through screws 9. The pressure plate 10 is limited above the bottom edge 6-1. The base 4 The reset rotating sleeve 6 is held, thereby rotating the reset rotating sleeve 6 on the base 4 and limiting its axial position.

An annular protrusion 2-3 is provided on the outer peripheral surface of the reset cylinder 2, and a limiting surface 6-2 is provided on the inner wall of the reset sleeve 6. The limiting surface 6-2 is located on the annular protrusion 2-3. 3 directly above it can prevent the reset cylinder 2 and the reset piston 3 from being separated.

When the reset component of the above-mentioned syringe is used, first determine the required stroke of the piston to return based on the stroke required for the amount of medicinal liquid to be injected. After determining the downward stroke of the reset cylinder 2, the reset cylinder 2. Move down to the reading on the length scale mark 11 corresponding to the end surface of the reset rotating sleeve 6, and then rotate the reset rotating sleeve 6 to change the distance between the adjusting sleeve 7 and the reset cylinder 2 until the adjusting sleeve 7 reaches the reset position. Bottom of cylinder 2;

Then move the reset core rod 1 downward, so that the fluid medium in the inner cavity 2-1 pushes the reset cylinder 2 upward to the highest point of the stroke; then remove the medicine core assembly on the syringe so that the reset core rod 1 can be inserted into the syringe inside and in contact with the plunger of the syringe;

Then you can hold the syringe with your hand to fix it relative to the reset assembly. Finally, you only need to press the reset cylinder 2 downward until the bottom of the reset cylinder 2 is resisted by the adjusting sleeve 7, and the piston can be pushed upward by the reset core rod 1. , so that the piston can be accurately reset.

The above-mentioned ideal embodiments of the present invention serve as inspiration. Through the above description, relevant workers can make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the description, and must be determined based on the scope of the claims.

Claims (8)

1. A reset component of a syringe, characterized in that: the reset component includes: Reset core rod (1), used to push the piston of the syringe to reset; The reset cylinder (2) has an inner cavity (2-1) for accommodating fluid medium, and the reset core rod (1) is slidably arranged at the upper end of the inner cavity (2-1); The reset piston (3) is inserted at the lower end of the inner cavity (2-1), and the inner cavity (2-1) is slidingly connected to the reset piston (3); and a base (4), the reset piston (3) is fixed on the base (4), and the inner cavity (2-1) is filled with fluid between the reset core rod (1) and the reset piston (3). The inner cavity (2-1) has a force-bearing surface (2-13) for the fluid medium to push the reset cylinder (2) to move upward along the reset piston (3). When the reset core rod (1) moves toward When the fluid medium is pushed downward, the fluid medium pushes the reset cylinder (2) upward along the reset piston (3) from the force-bearing surface (2-13) of the inner cavity (2-1); when the reset cylinder (2) moves downward When pushing the fluid medium, the fluid medium pushes the reset core rod (1) from the bottom of the reset core rod (1) to move upward along the inner cavity (2-1); The upper section of the inner cavity (2-1) is thin and the lower section is thick. A step surface is formed between the thick section (2-12) and the thin section (2-11) of the inner cavity (2-1). The step surface As the force-bearing surface (2-13), the reset core rod (1) is slidably disposed in the thin section (2-11) of the inner cavity (2-1), and the reset piston (3) is slidably disposed in the thin section (2-11) of the inner cavity (2-1). in the thick section (2-12) of the inner cavity (2-1). 2. The reset assembly of the syringe according to claim 1, characterized in that: a sealing ring (5) is provided between the reset core rod (1) and the inner cavity (2-1), and the reset piston (3 ) and the inner cavity (2-1) are also provided with a sealing ring (5). 3. The reset assembly of the syringe according to claim 1, characterized in that: the reset cylinder (2) is provided with a reset sleeve (6), and the reset sleeve (6) is rotatably arranged on the base (4) ), the reset sleeve (6) is connected with an adjusting sleeve (7), and the adjusting sleeve (7) is located below the reset cylinder (2). When the reset sleeve (6) is rotated, the adjusting sleeve (7) (7) Approach or move away from the relative reset cylinder (2). 4. The reset assembly of the syringe according to claim 3, characterized in that: the inner wall of the reset sleeve (6) is threadedly connected to the outer wall of the adjustment sleeve (7), and a guide rod is fixed on the base (4). (8), the guide rod (8) passes through the adjusting sleeve (7) and is slidingly connected with the adjusting sleeve (7). 5. The reset assembly of the syringe according to claim 4, characterized in that: the reset cylinder (2) is provided with a guide hole (2-2), and the guide rod (8) is slidingly connected to the guide hole (2-2). 2-2) within. 6. The reset assembly of the syringe according to claim 3, characterized in that: the bottom of the reset sleeve (6) has a bottom edge (6-1) extending outward, and the base (4) is provided with screws ( 9) A pressure plate (10) is fixed, the pressure plate (10) is limited above the bottom edge (6-1), and the base (4) holds the reset sleeve (6). 7. The reset assembly of the syringe according to claim 3, characterized in that: an annular protrusion (2-3) is provided on the outer peripheral surface of the reset cylinder (2), and the reset sleeve (6) is provided with an annular protrusion (2-3). There is a limiting surface (6-2) on the inner wall, and the limiting surface (6-2) is located directly above the annular protrusion (2-3). 8. The reset assembly of the syringe according to claim 3, characterized in that: a length scale mark (11) is provided on the outer wall of the reset cylinder (2).