CN105903104B - Reusable Cartridge Injection Holder - Google Patents

Abstract

The invention provides a reusable cartridge-type bottle injection bracket, which can solve the problems that the existing reusable syringe cannot meet the requirements for one-time injection of special drugs and the existing disposable syringe is not suitable for self-injection by patients. The front end of the cartridge-type bottle compartment is detachably installed with a needle assembly, and the rear end is installed on the front end of the sleeve-type pen body; the tubular push rod can move in the sleeve-type pen body, and its rear end is rotatably installed with an exhaust knob, The exhaust screw barrel is set in the tubular push rod and its rear end is locked and connected with the exhaust knob. The ejector rod penetrates the sleeve-type pen body and its front end extends into the cassette bottle compartment, and the rear end extends into the exhaust screw barrel. It is threadedly connected with the inner wall of the exhaust screw barrel, the outer circumference of the front end of the ejector rod is matched with the flat through hole in the center of the cartridge holder, and the outer circular surface of the front end of the exhaust screw barrel is a regular variable diameter outer circular surface and is connected with the tubular push rod. The inner circle of the front end of the tubular push rod is matched with the inner circle, so that the front end of the tubular push rod can radially expand outward to realize the tension locking or relative movement with the sleeve-type pen body.

Description

Reusable Cartridge Injection Holder

technical field

The invention relates to the field of medical devices, in particular to a reusable cartridge-type bottle injection support.

Background technique

Existing cartridge syringes include reusable syringes and disposable syringes. Among them, reusable syringes are mostly used for multiple injections of a single cartridge, such as an insulin injection pen, which is characterized in that a cartridge can be injected several times or even dozens of times as needed; the problem is that each injection will have Air enters the cartridge, and for some special medicines, because air is not allowed to be mixed, it needs to be injected in a single time. The existing reusable cartridge syringes cannot meet the one-time injection requirements of such special medicines; However, the existing disposable syringe needs to extract the medicine from the medicine bottle before injecting it. The preparation for injection is cumbersome, the injection time is long, and the medicine is easily polluted during the extraction and injection of the medicine. Injection anywhere is not suitable for patients to inject themselves; in addition, when using a disposable syringe for injection, it is necessary to manually press and visually check to exhaust the medicine in the cartridge, otherwise the air in the cartridge will enter the human body. The efficacy of the drug can even cause harm to the patient's body, but ordinary patients are prone to omit the exhausting step when injecting themselves, and it is difficult for patients to correctly grasp the exhausting force during the exhausting process, and they often end up with exhausted air or exhausted due to exertion. In addition, the disposable syringe also has the problem of inconvenience to carry, and the disposable syringe needs to be professionally recycled after use, otherwise the patient will cause environmental pollution if it is discarded arbitrarily after self-injection.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides a reusable cartridge-type bottle injection support, which can solve the problem that the existing reusable syringe cannot meet the requirements of one-time injection of special drugs, and can also solve the problem that the existing disposable syringe is not suitable for patients. The problem of self-injection.

Its technical scheme is a reusable cartridge-type bottle injection support, which comprises a cartridge-type bottle compartment, a sleeve-type pen body and a push rod device, and the cartridge-type bottle compartment is used for accommodating a cartridge-type bottle prefilled with medicine, The front end of the cartridge-type bottle compartment is detachably installed with a needle assembly, and the rear end is mounted on the front end of the sleeve-type pen body through the cartridge-type bottle holder, characterized in that: the push rod device includes a tubular push rod, a top A rod and an exhaust screw barrel, the tubular push rod is sleeved in the sleeve-type pen body and can move back and forth in the sleeve-type pen body, and the rear end of the tubular push rod is rotatably installed with an exhaust knob , the exhaust screw barrel is arranged in the tubular push rod and its rear end is locked and connected with the exhaust knob, the ejector rod penetrates the sleeve-type pen body and its front end passes through the cartridge-type bottle The seat extends into the cartridge-type bottle bin, and the rear end extends into the exhaust screw barrel and is threadedly connected with the inner wall of the exhaust screw barrel. The center of the cartridge-type bottle seat has a flat through hole. The outer circumference of the front end of the ejector rod is matched with the flat through hole, the outer circular surface of the front end of the exhaust screw barrel is a regular outer circular surface of variable diameter, and the outer circular surface of the variable diameter is matched with the inner circle of the front end of the tubular push rod. In cooperation, the front end of the tubular push rod can expand radially outward under the cooperation with the outer circular surface of the reducing diameter, so as to realize the tension locking or relative movement with the sleeve-type pen body.

Further, the front end of the exhaust screw barrel is provided with a head cam, the outer circular surface of the head cam is the outer circular surface of the variable diameter, and the outer circular surface of the variable diameter is tightened and locked by two groups of outer surfaces. The circular surface and the two groups of relatively movable outer circular surfaces are formed by enclosing them in turn in a clockwise direction, and the circumferential direction of each of the tightening and locking outer circular surfaces and the relatively movable outer circular surface at the front end in the clockwise direction are between each other. The outer diameter of the outer circular surface is locked by the tightening, and the outer diameter of the outer circular surface is locked by the tightening. The outer diameter is larger than the outer diameter of the relatively movable outer circular surface.

Further, the inner wall of the front end of the tubular push rod is provided with two mirror-symmetrical limit half-rings, and the side wall opening of the tubular push rod between the two limit half-rings forms two symmetrical elastic A clip, the outer side of the front end of the elastic clip is provided with claws, the inner side is provided with an inward flange, the bottom surface of the flange is flush with the top surface of the limiting half ring, the row The bottom surface of the head cam at the front end of the gas screw is limited by the limiting half ring, the flange is fitted with the outer circular surface of the head cam, and the flange can fit with the radial groove The inner wall of the sleeve-type pen body is symmetrically provided with two anti-retraction racks, and the claws on the elastic clips can cooperate with the anti-retraction teeth on the anti-retraction racks. The tooth top surface of the backstop tooth is tangent to the radial direction of the sleeve-type pen body, and the tooth bottom surface is inclined toward the rear end and is tapered.

Further, the bottom surface of the head cam of the exhaust screw barrel is provided with indexing holes uniformly distributed in the circumferential direction, and the top surfaces of the two limit half rings are respectively provided with indexing convex points, and the indexing convex The points can form a fit with the indexing holes.

Further, a damping spring is installed in the sleeve-type pen body, and the damping spring is sleeved on the outer periphery of the ejector rod. The top surface of the front end of the head cam abuts against the limit.

Further, the outer wall of the tubular push rod is provided with two parallel vertical guide grooves, and a guide block is fixed on the inner wall of the rear end of the sleeve-type pen body, and the guide block is fitted in the vertical guide. in the slot.

Further, the rear end of the exhaust screw barrel is a flat end, the flat end is embedded in the flat groove of the exhaust knob, and the rear end of the exhaust screw is connected to the exhaust. The knobs are locked by knob locks.

Further, the rear end of the exhaust screw barrel is provided with a central countersunk hole, the bottom surface of the flat groove of the exhaust knob is provided with a through hole, and the front end surface of the knob lock is provided with an elastic hook, so The elastic hook of the knob locking buckle extends into the through hole and is hooked with the central counterbore to lock the exhaust screw barrel and the exhaust knob.

Furthermore, a circumferential snap groove is formed on the outer side wall of the rear end of the tubular push rod, and a convex rib is provided on the inner peripheral surface of the exhaust knob, and the convex rib is fitted into the snap groove.

Further, the cartridge-type bottle holder includes a front end screw sleeve, a positioning ring and a rear end clamping sleeve which are arranged concentrically in sequence, and the cartridge-type bottle holder is threadedly connected to the outer circle of the front end screw sleeve and is connected by the positioning ring. The front end face is limited, the front end of the sleeve-type pen body is provided with a limit groove, the rear end ferrule is provided with a limit block, and the front end of the sleeve-type pen body is clamped outside the rear end ferrule on the circle and is limited by the rear end face of the positioning ring, and at the same time the limit block is embedded in the limit groove.

The beneficial effects of the cartridge injection holder of the present invention are that it can not only be used repeatedly, but also can quickly and conveniently inject all the medicines in the cartridge at one time in each use process, and can inject all the medicines in the cartridge before injection. The air inside is quantitatively and accurately exhausted, which prevents the patient from missing the exhaust operation or the exhaust is not in place during the self-injection, and ensures the safety of the injection; at the same time, it is easy to store and carry, and is more suitable for the patient's self-injection. injection.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the reusable cartridge-type bottle injection support of the present invention;

Fig. 2 is the perspective schematic diagram of the front view of the reusable cartridge-type bottle injection support of the present invention;

3 is a schematic structural diagram of a sleeve-type pen body in the reusable cartridge-type bottle injection support of the present invention;

4 is a schematic structural diagram of a tubular push rod in the reusable cartridge-type bottle injection support of the present invention;

Fig. 5 is the A-direction structural schematic diagram of Fig. 4;

Fig. 6 is the B-direction structural schematic diagram of Fig. 4;

Fig. 7 is the structural schematic diagram of the exhaust screw barrel in the reusable cartridge-type bottle injection support of the present invention;

FIG. 8 is a schematic view of the C-direction structure of FIG. 7;

FIG. 9 is a schematic three-dimensional structure diagram of the exhaust knob in the reusable cartridge-type bottle injection support of the present invention in the first view direction;

FIG. 10 is a schematic three-dimensional structure diagram of the exhaust knob in the reusable cartridge-type bottle injection support of the present invention in the second view direction;

Figure 11 is a schematic three-dimensional structural diagram of a knob lock in the reusable cartridge-type bottle injection support of the present invention;

12 is a schematic structural diagram of a cartridge holder in the reusable cartridge injection support of the present invention;

FIG. 13 is a schematic view of the D-direction structure of FIG. 12;

Fig. 14 is a partial enlarged schematic view of the stopper rack in the reusable cartridge-type bottle injection holder of the present invention.

Among them, 10-cartridge type bottle compartment, 20-sleeve type pen body, 21-limiting groove, 22-backstop rack, 231-tooth top surface, 232-tooth bottom surface, 24-damping spring, 25-guide block , 26-vertical installation groove, 30-cartridge bottle seat, 31-flat through hole, 32-front screw sleeve, 33-positioning ring, 34-rear end sleeve, 35-limiting block, 40-tubular push rod , 41-card groove, 42-limiting half ring, 421-indexing bump, 43-elastic clip, 44-jaw, 45-flange, 46-vertical guide groove, 50-top rod, 60-row Gas screw barrel, 61-flat end, 62-center counterbore, 63-head cam, 631a-tightening and locking outer circular surface, 631b-tightening and locking outer circular surface, 632a-relatively movable outer circular surface , 632b-relatively movable outer circular surface, 633-step surface, 634-radial groove, 635-indexing hole, 70-exhaust knob, 71-rib, 72-flat groove, 73-through hole, 80-knob lock, 81-elastic hook, 90-pen cap.

Detailed ways

1 and 2, the reusable cartridge injection holder of the present invention includes a cartridge case 10 for accommodating prefilled cartridges, a sleeve-type pen body 20 and a push rod device, The front end of the cartridge-type bottle holder 10 is detachably installed with the needle assembly, and the rear end is mounted on the front end of the sleeve-type pen body 20 through the cartridge-type bottle holder 30. The ring 33 and the rear end ferrule 34, the cartridge-type bottle compartment 10 is threadedly connected to the outer thread of the front-end screw sleeve 32 and is limited by the front-end surface of the positioning ring 33, and the front end of the sleeve-type pen body 20 is opened with a limit slot 21, The rear end ferrule 34 is provided with a limit block 35 , the front end of the sleeve-type pen body 20 is clamped on the outer circle of the rear end ferrule 34 and is limited by the rear end surface of the positioning ring 33 , and the limit block 35 is embedded in the limit. Position slot 21, so as to ensure that there is no relative rotation between the sleeve-type pen body 20 and the cartridge-type bottle holder 30.

The push rod device includes a tubular push rod 40, a top rod 50 and an exhaust screw 60. The outer circle of the tubular push rod 40 is sleeved with the inner circle of the sleeve type pen body 20 and the tubular push rod 40 can be inside the sleeve type pen body 20. Moving back and forth, the outer side wall of the rear end of the tubular push rod 40 is provided with a circumferential slot 41, as shown in Figures 4 and 6, and a convex rib 71 is provided on the inner peripheral surface of the exhaust knob 70, as shown in Figure 9, the convex rib 71 Fitted in the slot 41, so that the relative rotation between the exhaust knob 70 and the tubular push rod 40 can be achieved; the exhaust screw 60 is arranged in the tubular push rod 40 and its rear end is connected to the exhaust knob through the knob lock 80 70 locking connection, the rear end of the exhaust screw 60 is the flat end 61, see Figure 7, the flat end 61 is embedded in the flat groove 72 of the exhaust knob 70, so the exhaust screw 60 can be discharged with The air knob 70 rotates synchronously, the rear end of the exhaust screw cylinder, that is, the flat end 61, is provided with a central counterbore 62, the bottom surface of the flat groove 72 of the air release knob 70 is provided with a through hole 73, and the front end of the knob lock 80 is provided with a hole 73. There are elastic hooks 81, and the elastic hooks 81 of the knob locks extend into the through holes 73 and hook with the stepped surface of the central counterbore 62, so that the knob locks 80 lock the exhaust screw 60 and the exhaust knob 70; The rod 50 penetrates the sleeve-type pen body 20 and its front end passes through the cartridge-type bottle holder 30 and then extends into the cartridge-type bottle compartment 10, and the rear end extends into the exhaust screw barrel 60 and is threadedly connected with the inner wall of the exhaust screw barrel 60, A flat through hole 31 is formed in the center of the positioning ring 33 of the cartridge holder 30, and the outer periphery of the front end of the ejector rod 50 is matched with the flat through hole 31. When the exhaust screw 60 rotates synchronously with the exhaust knob 70, due to the The rear end is threadedly connected to the inner wall of the exhaust screw 60 , and the front end of the ejector rod 50 is matched with the flat through hole 31 of the cartridge holder 30 , so the ejector rod 50 can only translate back and forth.

The front end of the exhaust screw barrel 60 is provided with an integrated head cam 63, the outer circular surface of the head cam 63 is a regular variable diameter outer circular surface, and the variable diameter outer circular surface is formed by two sets of tightening and locking outer circular surfaces 631a, 631b and the two groups of relatively movable outer circular surfaces 632a and 632b are formed to be enclosed and spaced in turn in the clockwise direction, and the circumferential direction of each tightening and locking outer circular surface and the relatively movable outer circular surface at the front end in the clockwise direction are formed. The stepped surface 633 is engaged with the relatively movable outer circular surface at the rear end in the clockwise direction through a radial groove 634. The outer diameter R1 of the tightening and locking outer circular surface is larger than the outer diameter of the relatively movable outer circular surface. R2; the inner wall of the front end of the tubular push rod 40 is provided with two mirror-symmetric limit half rings 42, and the side wall opening of the tubular push rod 40 between the two limit half rings 42 forms two symmetrical elastic clips Strip 43, the outer side of the front end of the elastic clip 43 is provided with a claw 44, and the inner side is provided with an inward flange 45, the bottom surface of the flange 45 is flush with the top surface of the limiting half ring 42, and the exhaust screw 60 The bottom surface of the front-end head cam is limited by two limit half rings 42, the flange 45 is in contact with the outer surface of the variable diameter of the head cam 63, and the flange 45 can be inserted into the radial groove 634, the sleeve The inner wall of the pen body 20 is provided with two mutually symmetrical vertical installation grooves 26, and the two vertical installation grooves 26 are respectively fitted with the anti-retraction racks 22. The backstop teeth on the rack 22 can be matched, the tooth top surface 231 of the backstop tooth is tangent to the radial direction of the sleeve-type pen body, and the tooth bottom surface 232 is inclined toward the rear end and is tapered. During the synchronous rotation of the exhaust screw cylinder 60 with the exhaust knob 70 , when the front-end head cam 63 of the exhaust screw cylinder 60 rotates to tighten the outer circular surface 631 a or 631 b and the flange 45 on the inner side of the elastic clip 43 . When fitting, the elastic clip 43 expands outwardly due to the pushing action of the tightening and locking outer circular surface 631a or 631b and the elastic action of the elastic clip 43 so that the outer claw 44 and the inner wall of the sleeve-type pen body 20 The upper anti-return rack 22 is completely engaged, so that the tubular push rod 40 and the sleeve-type pen body 20 are completely tightened and locked. When the front-end head cam 63 of the exhaust screw barrel 60 rotates until the relatively movable outer circular surface 632a or 632b is in contact with the flange 45, the elastic clip 43 is affected by the relatively movable outer surface 632a or 632b. The push of the round surface 632a or 632b expands outwards so that the claws 44 can just hook on the tooth top surface 231 of the anti-retraction teeth on the back-stop rack 22 on the inner wall of the sleeve-type pen body 20. There is a gap between the tooth bottom surfaces of the adjacent front-end backstop teeth, so if a forward thrust is applied to the tubular push rod 40 at this time, the claws 44 will be squeezed by the oblique tooth bottom surface and under the action of its own elastic deformation. 40 can move forward relative to the sleeve-type pen body 20, and since the tooth top surface 231 of each backstop tooth is tangent to the radial direction of the sleeve-type pen body, if the tubular push rod 40 is pulled backward at this time, the claw 44 The tubular push rod 40 cannot move backward relative to the sleeve-type pen body 20 due to the resistance of the tooth top surface of the anti-retraction teeth; when the front-end head cam 63 of the exhaust screw 60 rotates until the flange 45 is embedded in the radial groove 634 At this time, the elastic clip 43 does not undergo elastic deformation to expand outward, and the clip 44 is completely disengaged from the backstop rack 22. At this time, the tubular push rod 40 can move freely on the sleeve-type pen body 20.

The bottom surface of the head cam of the exhaust screw barrel 60 is provided with indexing holes 635 uniformly distributed in the circumferential direction, and the top surfaces of the two limiting half rings 42 are respectively provided with indexing bumps 421. Since the tubular push rod 40 does not rotate with the exhaust screw barrel 60, each time the exhaust screw barrel 60 rotates through a fixed angle α (α is the central angle between the two adjacent indexing holes ) The indexing convex point 421 will fall from the former indexing hole along the rotation direction into the latter indexing hole, and there is a quantitative proportional relationship between the rotation angle of the exhaust screw 60 and the linear moving distance of the ejector rod 50 Therefore, by setting the number of the indexing holes 635, the moving distance of the ejector rod 50 driven by the exhaust screw 60 can be accurately controlled, and the ejector rod 50 can be pushed to the plunger of the cartridge. The amount of exhaust gas is accurately controlled; in this embodiment, there are twelve indexing holes 635 in total.

A damping spring 24 is installed in the sleeve-type pen body 20 and the damping spring 24 is sleeved on the outer periphery of the ejector rod 50 . The top surface of the front end of the cam 63 abuts against the limit. When the flange 45 on the inner side of the elastic clip 43 is embedded in the radial groove 634 on the outer circle of the head cam 63, the exhaust screw cylinder 60 and The whole tubular push rod 40 can be quickly moved backward and reset.

The outer wall surface of the tubular push rod 40 is provided with two parallel vertical guide grooves 46, and a guide block 25 is fixed on the inner wall of the rear end of the sleeve type pen body 20. The guide block 25 is fitted in the vertical guide groove 46, thereby ensuring The reliability of the movement between the tubular push rod 40 and the sleeve-type pen body 20 avoids relative rotation between the two due to a gap.

For ease of understanding, the front end and the rear end representing the orientation in the present invention are based on the sleeve-type pen body 20, the end facing the needle assembly is the front end, and the opposite direction is the rear end.

Describe the use process of the present invention in detail below:

(1) Rotate the exhaust knob 70 counterclockwise to the end, and the exhaust screw 60 rotates synchronously with the exhaust knob 70 to drive the ejector rod 50 to retreat to the initial position, and make the flange 45 on the inner side of the elastic clip 43 of the tubular push rod embedded in the exhaust valve. In the radial groove 634 of the head cam 63 at the front end of the air screw barrel 60, the exhaust screw barrel 60 and the tubular push rod 40 as a whole are quickly ejected from the sleeve-type pen body 20 under the rebound action of the damping spring 24. When the flange 45 on the inner side of the elastic clip of the tubular push rod is in contact with the tightening and locking outer circumferential surfaces 631a and 631b of the head cam 63 at the front end of the exhaust screw cylinder 60, the tubular push rod 40 and the sleeve-type pen are in contact with each other. The bodies 20 can only be moved slightly with a small gap but cannot be moved relatively large, that is to say, the injection can not be performed by pushing the tubular push rod 40 in this state;

(2) Unscrew the cartridge case 10 from the front end screw sleeve 32 of the cartridge holder 30 , put the prefilled cartridges into the cartridge case 10 , and then put the cartridge case 10 The rear end is threadedly assembled with the front end screw sleeve 32 of the cartridge holder 30, and the needle assembly is assembled on the front end of the cartridge holder;

(3) Gently press the tubular push rod 40 forward, and the tubular push rod 40 drives the exhaust screw 60 and the ejector rod 50 to move forward together until the front end of the ejector rod 50 contacts the top surface of the bottle plunger. The flange 45 on the inner side of the elastic clip is still in contact with the tightening and locking outer surfaces 631a and 631b of the outer circle of the head cam 63 at the front end of the exhaust screw barrel 60, so that the tubular push rod 40 cannot be pushed for injection; then clockwise Turn the exhaust knob 70 to drive the exhaust screw 60 to rotate, and the exhaust screw 60 drives the ejector rod 50 to move forward to push the cartridge plunger to complete the exhaust. In this embodiment, the exhaust can be exhausted according to the needs of exhaust. The knob 70 is rotated 1/12th to 3/12ths of a turn clockwise, and 2 units of exhaust can be achieved for each 1/12th turn; In the process of moving forward, the head cam 63 rotates synchronously, so that the flange 45 on the inner side of the elastic clip of the tubular push rod changes from the state of being in contact with the outer circular surface 631a/631b of the tightening and locking to the relatively movable outer circle. The state in which the surfaces 632a/632b are attached;

(4) Hold the sleeve type pen body 20 tightly and press the tubular push rod 40 forward. At this time, since the flange 45 inside the elastic clip of the tubular push rod is in contact with the relatively movable outer circular surface 632a/632b In this state, the claws 44 are squeezed by the bottom surface of the inclined teeth and under the action of their own elastic deformation, as well as the structure of the stop teeth on the stop rack, the tubular push rod 40 can only move forward but cannot be withdrawn in the reverse direction, thereby completing the injection. And no matter how many doses are injected, the tubular push rod 40 will not be pushed back by the damping spring;

(5) After the injection is completed, the claw 44 of the elastic clip on the tubular push rod is locked at the front end of the anti-retraction rack, remove the needle assembly from the front end of the cassette bottle holder 10, and then put the cap 90 on the cassette. On the bottle compartment 10, the entire cartridge-type bottle injection bracket has the shortest length at this time, which is convenient for storage;

Repeat the above steps when the cartridge injection holder needs to be reused.

Claims (4)

1. Reusable card bottle injection support, it includes card bottle storehouse, telescopic body of a brush and push rod device, card bottle storehouse is used for holding the card bottle that has filled the medicament in advance, the front end detachably in card bottle storehouse install the syringe needle subassembly, the rear end through card bottle seat install in the front end of telescopic body of a brush, its characterized in that: the push rod device comprises a tubular push rod, a push rod and an exhaust screw barrel, the tubular push rod is sleeved in the sleeve type pen body and can move back and forth in the sleeve type pen body, an exhaust knob is rotatably installed at the rear end of the tubular push rod, the exhaust screw barrel is arranged in the tubular push rod, the rear end of the exhaust screw barrel is connected with the exhaust knob in a locking manner, the push rod penetrates through the sleeve type pen body, the front end of the push rod extends into the clamping type bottle bin through the clamping type bottle seat, the rear end of the push rod extends into the exhaust screw barrel and is in threaded connection with the inner wall of the exhaust screw barrel, a flat through hole is formed in the center of the clamping type bottle seat, the periphery of the front end of the push rod is matched with the flat through hole, the outer circle surface of the front end of the exhaust screw barrel is a regular reducing diameter outer circle surface, the outer circle surface is matched with the inner circle of the front end of the tubular push rod, and the front end of the sleeve type push rod can radially expand outwards under the matching action of the reducing diameter outer circle surface to realize the pen body The bodies are locked by tension or can move relatively;

the front end of the exhaust screw cylinder is provided with a head cam, the outer circular surface of the head cam is the variable-diameter outer circular surface, the variable-diameter outer circular surface is formed by sequentially enclosing two groups of tensioning locking outer circular surfaces and two groups of relatively movable outer circular surfaces at intervals along a clockwise direction, the circumferential direction of each tensioning locking outer circular surface is in stepped surface joint with the relatively movable outer circular surface at the front end along the clockwise direction and is in radial groove joint with the relatively movable outer circular surface at the rear end along the clockwise direction, and the outer diameter of each tensioning locking outer circular surface is larger than that of the relatively movable outer circular surface;

two mirror-symmetrical limiting semi-rings are arranged on the inner wall of the front end of the tubular push rod, two symmetrical elastic clamping strips are formed at the side wall opening of the tubular push rod between the two limiting semi-rings, the outer side surface of the front end of the elastic clamping strip is provided with a clamping jaw, the inner side surface is provided with an inward flange, the bottom surface of the flange is flush with the top surface of the limit semi-ring, the bottom surface of the cam at the front end of the exhaust screw cylinder is limited by the limiting half ring, the flange is attached to the reducing outer circular surface of the cam at the head part and can be embedded and matched with the radial groove, two backstop racks are symmetrically arranged on the inner wall of the sleeve type pen body, the claws on the elastic clamping strips can be matched with the backstop teeth on the backstop racks, the tooth top surface of the stopping tooth is tangent to the radial direction of the sleeve type pen body, and the tooth bottom surface is inclined towards the rear end and is in a tapered shape;

the bottom surface of the head cam of the exhaust screw cylinder is provided with indexing holes which are uniformly distributed in the circumferential direction, and the top surfaces of the two limit semi-rings are respectively provided with indexing convex points which can be matched with the indexing holes;

the rear end of the exhaust screw cylinder is a flat end which is embedded in a flat groove of the exhaust knob, and the rear end of the exhaust screw cylinder and the exhaust knob are locked through a knob lock catch;

a damping spring is arranged in the sleeve type pen body and sleeved on the periphery of the ejector rod, and two ends of the damping spring are respectively abutted and limited by the top surfaces of the clamping type bottle seat and the front end of the head cam of the exhaust screw cylinder;

the outer wall surface of the tubular push rod is provided with two parallel vertical guide grooves, the inner wall of the rear end of the sleeve type pen body is fixedly provided with a guide block, and the guide block is embedded in the vertical guide grooves.

2. The reusable cartridge injection rack of claim 1, wherein: the rear end of the exhaust screw cylinder is provided with a central counter bore, the bottom surface of the flat groove of the exhaust knob is provided with a through hole, the front end surface of the knob lock catch is provided with an elastic hook, and the elastic hook of the knob lock catch is hooked with the central counter bore after extending into the through hole so as to lock the exhaust screw cylinder and the exhaust knob.

3. The reusable cartridge injection rack of claim 2, wherein: the outer side wall of the rear end of the tubular push rod is provided with a circumferential clamping groove, the inner circumferential surface of the knob lock catch is provided with a convex rib, and the convex rib is embedded in the clamping groove.

4. The reusable cartridge injection rack of claim 1, wherein: the clamping type bottle seat comprises a front end screw sleeve, a positioning ring and a rear end clamping sleeve which are concentrically arranged in sequence, the clamping type bottle bin is in threaded connection with the excircle of the front end screw sleeve and is limited by the front end face of the positioning ring, the front end part of the sleeve type pen body is provided with a limiting groove, the rear end clamping sleeve is provided with a limiting block, the front end of the sleeve type pen body is clamped on the excircle of the rear end clamping sleeve and is limited by the rear end face of the positioning ring, and meanwhile, the limiting block is embedded into the limiting groove.

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