CN203090106U - Time counting type injector - Google Patents

Abstract

A counted syringe comprises an injection sleeve assembly, an injection push rod and a counting wheel ring, wherein the injection sleeve assembly is detachably assembled to provide a medicine bottle and an injection needle assembly, the injection push rod and a dose indicator component are installed inside the injection sleeve assembly, a plurality of interference threads are formed inside the ring body of the counting wheel ring, and the injection push rod forms one or two radially corresponding driving thread segments on the outer peripheral surface of the driving portion through the ring body, the driving thread segments can selectively engage with the interference threads in the counting wheel ring, so that each time the syringe is used for injection, that is, when the injection push rod is used to move straight in the injection sleeve assembly, the driving thread segments drive the counting wheel ring to rotate one grid for counting, and when the number of times the syringe is reused reaches a set number, the counting wheel ring is stuck in the injection sleeve assembly, so that the syringe function is invalid and can no longer be used.

Description

counting syringe

technical field

The utility model relates to a syringe, in particular to a counting type syringe which can control the times of repeated use. the

Background technique

At present, such as insulin injection, small needle beauty, etc., all use a small syringe to extract a predetermined dose of medicine from a medicine bottle containing the injection medicine, and then penetrate the human body through the needle at the front end of the syringe to inject the medicine into the human body. the

When the existing general syringe is in use, because its components are all in contact with the drug, based on the safety of the injection, all the components of the entire syringe need to be discarded after use, so the cost of the syringe is high for patients. Not less, causing a heavy burden on the treatment, and the amount of waste of used syringes is too much. the

In order to solve the problem that the entire injection must be completely discarded after the existing syringe is used, the applicant of the utility model has previously proposed a syringe that can be partially reused. The syringe mainly utilizes the reusable structure of the syringe body, and only the drug container and the needle containing the fixed-dose injection drug are disposable components, so as to meet the safety of the injection drug and achieve material saving , the function of reducing unnecessary material waste. the

However, based on the safety of the syringe, the reusable components in the aforementioned syringe should also consider the number of reasonable reuses to maintain the safety of the syringe. However, the composition of the syringe does not provide a limit on the number of uses. mechanism, there is a need for further improvement. the

Utility model content

The main purpose of the utility model is to provide a counting syringe, hoping that the utility model can improve the existing reusable syringes that cannot automatically limit the number of times of repeated use. the

In order to achieve the aforementioned purpose, the counting syringe proposed by the utility model includes:

An injection sleeve set, which includes a hollow first sleeve and a hollow second sleeve, the first sleeve is used to provide a medicine bottle, one end of the first sleeve has a needle connection end, the needle The connecting end is used to provide an injection needle assembly thereon, the other end of the first sleeve has an engaging end, the second sleeve includes a socket pipe part and an extension pipe part connected to one end of the socket pipe part, and The joint ends of the first sleeve are detachably assembled with the socket pipe part, a partition part is formed inside the second sleeve between the socket pipe part and the extension pipe part, and a partition part passes through the partition part and There is a shaft tube part with a middle hole, and the second sleeve forms a ring part connecting the partition part on the periphery of the shaft tube part facing the first sleeve part, the inner wall of the ring part forms at least one end protrusion, and the shaft tube part faces The outer peripheral surface of one end section of the first sleeve has two radially opposite limit stops, and there is a distance between the limit stops and the partition;

An injection push rod is movably installed in the injection sleeve group and can be connected to the piston in the medicine bottle. The injection push rod includes a rod body and an operating part, and one axial end of the rod body is a The other end of the rod body in the axial direction is a rod connection part, the rod connection part of the rod body protrudes outside the second sleeve, the operating part is located outside the second sleeve to connect the rod connection part, and the rod body is formed on the outer peripheral surface of the drive part. a driving thread segment, the plurality of driving thread segments are arranged in succession along the axial direction of the rod body, the driving thread segment comprises a plurality of adjacent parallel thread bars, and the plurality of thread bars in the adjacent driving thread segments are connected in a forward spiral; as well as

A counting wheel ring, including a ring body, a plurality of hooks and a locking part, the ring body is installed in the second sleeve, and sleeved on the outside of the driving part of the rod body of the injection push rod, the ring A plurality of forward-helical interference threads are formed on the peripheral surface of the body, and the interference threads can selectively engage the driving thread section of the driving part of the rod body. The side end of the part, the plurality of hook pieces are arranged at equal intervals, the hook pieces are hooked against the limit stopper, so that the counting wheel ring can only rotate at a fixed point, and the end protrusion of the second sleeve is against the The gap between the ends of two adjacent hook pieces, the end of the locking part has a locking concave edge, the linear movement of the injection push rod in the injection sleeve group can make the rod body drive the threaded section to drive the counting ring to rotate one grid, and The counting wheel ring is rotated until the end projection is locked at the locking concave edge of the locking part and is locked and fixed. the

Through the utility model of the counting syringe described above, the components such as the injection sleeve group, the injection push rod and the counting ring can maintain the function of being reusable for many times, and the counting syringe further enables the A plurality of forward spiral interference threads are formed inside the counting wheel ring inside the group, and the rod body of the injection push rod passes through the outer peripheral surface of the driving part of the counting wheel ring to form corresponding driving thread segments along one or two radial directions, and the driving thread The forward helical thread strip of the segment can selectively engage the interference thread in the counting ring, so that every time the syringe is used for injection, the linear movement of the injection plunger in the injection sleeve group drives the counting via the drive thread segment The ring rotates one grid to count the number of times. When the number of repeated use of the syringe reaches the set number of times, the counting ring is stuck on the injection sleeve group, so that the function of the syringe becomes invalid and cannot be used again, ensuring that the counting syringe is free from Excessive reuse to maintain the safety of syringe use. the

Description of drawings

Fig. 1 is a three-dimensional exploded schematic view of a preferred embodiment of the counting syringe of the present invention, a medicament bottle and an injection needle. the

Fig. 2 is a schematic diagram of the combined appearance of the preferred embodiment of the counting syringe shown in Fig. 1 in combination with the medicament bottle and the injection needle. the

Fig. 3 is a three-dimensional exploded schematic diagram of the rod body and dose display ring of the injection push rod in the preferred embodiment of the counting syringe shown in Fig. 1 . the

Fig. 4 is a three-dimensional exploded cross-sectional schematic view of the second sleeve and the sliding sleeve in the preferred embodiment of the counting syringe shown in Fig. 1 . the

Fig. 5 is a schematic cross-sectional view of the combination of the preferred embodiment of the counting syringe shown in Fig. 1 combined with the medicament bottle and the injection needle. the

Fig. 6 is a schematic cross-sectional view at the position of section line 6-6 in Fig. 5 . the

Fig. 7 is a schematic cross-sectional view at the position of section line 7-7 in Fig. 5 . the

Fig. 8 is a combined cross-sectional schematic view of another angle of the preferred embodiment of the counting syringe shown in Fig. 1 combined with the medicine bottle and the injection needle. the

Fig. 9 is a schematic cross-sectional view at the position of section line 9-9 in Fig. 8 . the

Description of reference numbers

1 medicine bottle 1A piston

2 injection needles

3 injection sleeve sets

31 first sleeve 311 needle connection end

312 joint end 313 hook

314 alignment convex part

322 extension pipe part 323 partition part

324 shaft tube part 3241 shrapnel part

3242 limit stop 3243 raised strip

3244 guide bump 3245 abutment bump

325 Wing Department

326 clamping flange 327 pressing shrapnel

329 ring department

3291 end bump

4 injection push rod 40 rod body

401 Driving part 402 Rod connecting part

403 Rod body end block 404 Driving threaded section

405 ring flange 406 flange

41 Operating part 411 Knob part

412 fitting pipe part 413 fixing hook

42 sliding sleeve 421 sleeve body

422 fixed part 4221 card connection hole

423 guide groove 424 annular baffle

425 connecting part 4251 slit

426 chute

5 count wheel ring 50 ring body

51 interference thread 52 hook piece

53 locking part 531 locking concave edge

6 cover

Detailed ways

Below, in conjunction with the accompanying drawings and preferred embodiments of the utility model, the technical means adopted by the utility model to achieve the intended purpose of the utility model will be further elaborated. the

As shown in FIG. 1 , the counting syringe of the present invention is used to provide a disposable medicament bottle 1 and a disposable injection needle 2 assembled thereon for medicament injection. The disposable medicine bottle 1 includes a bottle body containing medicine for injection. One end of the bottle body is hermetically assembled with a closed end cap. Piston 1A; the disposable injection needle 2 is mainly an injection needle with a needle hole inside fixed in the socket part, the section where the injection needle protrudes out of the socket part is the injection section, and the section inside the socket part The segment is a puncture segment, and the puncture segment is used to puncture through the closing cap of the medicament bottle 1 and extend into the medicament bottle 1 . the

As shown in Figure 1, the composition of the counting syringe of the present utility model mainly includes: an injection sleeve group 3, an injection push rod 4 and a counting ring 5, or further includes a protective cover 6, wherein:

As shown in Figures 1 and 2, the injection sleeve set 3 includes a first sleeve 31 and a second sleeve 32, the first sleeve 31 is a hollow body with an axially penetrating interior for use in The first sleeve 31 has a needle connecting end 311 at one end and an engaging end 312 at the other end. The needle connecting end 311 is used to provide the medicine bottle 1 with a closed One end of the cover protrudes into it, and provides a socket for the injection needle 2 to be sleeved on it, so that the injection needle 2 can be inserted into the medicine bottle 1 . In this preferred embodiment, a plurality of hooks 313 arranged at intervals are formed on the side end of the joint end 312 of the first sleeve 31, and the hooks 313 and the second sleeve 32 can be combined by snapping. Disassembled and put together. the

As shown in Figures 1 and 2, the second sleeve 32 is a hollow body with an axially penetrating interior, and the second sleeve 32 includes a socket pipe part 321 and a socket connected to one end of the socket pipe part 321. The extension tube part 322, the sleeve tube part 321 is detachably assembled to the joint end part 312 of the first sleeve 31, and the injection sleeve set 3 combined with the first sleeve 31 and the second sleeve 32 injects the medicine Bottle 1 is fixed therein. the

As shown in Fig. 1, Fig. 4, Fig. 5 and Fig. 9, a baffle part 323 is formed inside the second sleeve 32 between the sleeve pipe part 321 and the extension pipe part 322 and has a baffle part 323 passing through it. The shaft tube part 324 divides the inner space of the second sleeve 32 into an assembly space located in the sleeve tube part 321 and an activity space located in the extension tube part 322 through the partition part 323, and the partition part 323 provides Where the drug bottle 1 abuts, the outer peripheral surface of the socket pipe portion 321 forms an outwardly protruding fin portion 325 , and the assembly space of the second sleeve 32 forms an assembly port at the outer end of the socket pipe portion 321 The sleeve pipe portion 321 forms a clamping flange 326 adjacent to the assembly port in the movable space, and a plurality of pressing elastic pieces 327 are formed on the outer peripheral wall of the sleeve pipe portion 321, and grooves are formed around the pressing elastic pieces 327, so that the pressing elastic pieces 327 are adjacent to the card. One end of the flange 326 is a free end and has the elasticity of radial movement and recovery, so that the joint end 312 of the first sleeve 31 is inserted into the socket pipe portion 321 of the second sleeve 32, and the hook 313 is hooked on the hook. At the locking flange 326 , the hook 313 can be pushed against the locking flange 326 by the pressing elastic piece 327 , so that the joint end 312 of the first sleeve 31 can be disassembled from the socket pipe portion 321 of the second sleeve 32 . the

In the aforementioned second sleeve 32, the shaft tube part passing through the partition part 323 includes a first section located in the assembly space and a second section located in the activity space, and the second sleeve 32 is located in the shaft tube part. 324, a ring portion 329 connecting the partition portion 323 is formed on the periphery of the first section, and the shaft tube portion 324 forms an axially penetrating middle hole, and the end of the second section of the shaft tube portion 324 forms two radially corresponding And there is an elastic elastic part 3241, each end of the elastic part 3241 forms an abutment protrusion 3245, and a single oblique slope is formed on the abutment protrusion 3245, and the outer periphery of the first section of the shaft tube part 324 The inner wall of the ring part 329 forms one or more end projections 3291. In this preferred embodiment, the outer peripheral surface of the first section of the shaft tube part 324 has two radially opposite limit stops 3242. The limit stoppers 3242 There is a distance between the second sleeve 32 and the partition part 323, and a plurality of axially extending and spaced ribs 3243 can be formed on the inner wall of the extension tube part 322 of the second sleeve 32, and the inner wall of the extension tube part 322 is still Two radially corresponding guiding protrusions 3244 can be formed. the

As shown in Figure 1, the injection push rod 4 is movably installed in the first sleeve 31 and the second sleeve 32, and can be connected to the piston 1A of the medicine bottle 1, and the injection push rod 4 includes A rod body 40 and an operating part 41, wherein:

As shown in Figures 1 and 3, one axial end of the rod body 40 is a driving part 401, and the other axial end of the rod body 40 is a rod connecting part 402, and the driving part 401 can directly abut against the drug bottle 1. The piston 1A, or the driving part 401 is combined with a circular rod body end block 403, so that the rod body end block 403 abuts against the piston 1A of the medicine bottle 1, and the rod connection part 402 of the rod body 40 protrudes from the second end of the injection sleeve set 3. Outside the sleeve 32, the rod body 40 forms a plurality of driving thread segments 404 on the outer peripheral surface of its driving part 401, and the driving thread segments 404 are arranged in succession along the axial direction of the rod body 40, and the driving thread segments 404 include a plurality of adjacent and juxtaposed and a threaded strip that spirals forward, and a plurality of threaded strips in the adjacent driving threaded section 404 are connected in a forward spiral. The number of sections of the driving threaded section 404 is adjusted according to the actual size of the pharmaceutical bottle installed. In this preferred embodiment Among them, the driving portion 401 of the rod body 40 forms 18 driving thread segments 404 . the

As shown in FIG. 1 , the operating member 41 is assembled to the end of the rod connecting portion 402 protruding from the outside of the second sleeve 32 of the rod body 40 . the

As shown in Figure 1, Figure 4, Figure 8 and Figure 9, in this preferred embodiment, the injection push rod 4 still includes a sliding sleeve 42, and the sliding sleeve 42 includes a sleeve body 421 and a sleeve body 421 The fixed part 422 at one end, the sleeve 421 is movably extended into the activity space of the extension tube part 322 of the second sleeve 32 and sleeved on the outside of the shaft tube part 324, where the second sleeve 32 extends A plurality of protrusions 3243 formed in the tube portion 322 can contact the outer peripheral surface of the sliding sleeve 42 , and the fixing portion 422 is assembled with the rod connecting portion 402 of the rod body 40 and the operating member 41 to be able to move together. the

A plurality of guide grooves 423 are distributed on the outer peripheral surface of the sleeve body 421, each of the guide grooves 423 has a straight groove portion extending axially and a spiral groove portion, and the straight groove portion has a first groove end and a first groove end. The two groove ends are respectively located at both ends of the axial direction, and the spiral groove parts are respectively located between two adjacent straight groove parts, and the first groove end of the straight groove part in the two adjacent straight groove parts spirals at an angle to connect the adjacent sides The second groove end of the other straight groove part, in this preferred embodiment, two guide grooves 423 are formed on the outer peripheral surface of the sleeve body 421, and the straight groove parts of the two guide grooves 423 are arranged in a radial direction, and the spiral groove part It spirals 180 degrees in the forward direction and is connected between two adjacent straight grooves. As shown in Figure 1, Figure 8 and Figure 9, the two guide grooves 423 on the sleeve body 421 of the sliding sleeve 42 respectively provide two radially corresponding guide projections on the inner wall of the extension tube portion 322 of the second sleeve 32 3244 protrudes into it, so that when the guide projection 3244 is located in the straight groove part of the guide groove 423 of the sliding sleeve 42, the injection push rod 4 can push the piston 1A in the medicine bottle 1 axially forward; When the guiding protrusion 3244 moves to the helical groove portion of the guide groove 423, the injection push rod 4 can move in the opposite direction in a helical manner, which has less labor-saving operation convenience. the

As shown in Fig. 1, Fig. 4, Fig. 8 and Fig. 9, in this preferred embodiment, the inner peripheral surface of the sliding sleeve 42 forms a plurality of single oblique chute portions 426, providing the shaft tube of the second sleeve 32 The abutting projection 3245 at the end of the elastic part 3241 of the part 324 is abutted in the chute part 426, and the inside of one end of the sliding sleeve 42 used to connect the operating part 41 forms an annular baffle 424 with an inner hole and a self-inner The edge of the hole extends towards the connecting portion 422 towards the end of the fixed portion 422. A connecting space is formed between the connecting portion 425 and the inner wall of the fixed portion 422. The surrounding wall of the connecting portion 425 is distributed with a plurality of cutouts extending axially from its end. Slits 4251, so that the connecting part 425 has the elasticity of expansion and recovery. The fixed part 422 of the sliding sleeve 42 is adjacent to the annular baffle 424 to form a plurality of clamping holes 4221. The clamping holes 4221 communicate with the assembly space. A radially protruding ring flange 405 is formed on the rod connecting portion 402 of the rod body 40, and a flange 406 is formed at the end of the rod connecting portion 402. The rod body 40 extends into the inside of the sliding sleeve 42, and the rod connecting portion 402 of the rod body 40 is correspondingly inserted. In the connecting portion 425 in the sliding sleeve 42 , the ring flange 405 abuts against the side end of the annular baffle 424 , and the flange 406 abuts against the end of the connecting portion 425 to form a combination. the

As shown in Figure 1, Figure 5 and Figure 8, the operating part 41 is located outside the second sleeve 32 to assemble the rod connecting part 402 of the rod body 40 and the sliding sleeve 42, the operating part 41 includes a knob part 411 and a The inside of the knob part 411 is an axially protruding fitting pipe part 412, and a plurality of fixing hooks 413 are formed at the end of the fitting pipe part 412. And the fitting pipe part 412 protrudes into the assembling space in the fixing part 422 and is sleeved on the outside of the connecting part 425, and the plurality of fixing hooks 413 are respectively snapped into the locking holes 4221 of the fixing part 422 of the sliding sleeve 42 Among them, the operating member 41 , the sliding sleeve 42 and the rod body 40 are fixedly connected together, and the outer peripheral surface of the knob portion 411 of the operating member 41 can still form a concave-convex anti-slip part. the

In the preferred embodiment shown in Figure 1, the side end of the joint end 312 of the first sleeve 31 can further form a plurality of alignment protrusions 314, and the alignment protrusions 314 and the hooks 313 It is arranged in a staggered manner; the socket pipe part 321 of the second sleeve 32 can further form a plurality of alignment concave parts 3211 corresponding to the alignment convex parts 314 at its assembly port, through the alignment convex parts 314 and the alignment concave parts 3211, so that the joint end portion 312 of the first sleeve 31 and the socket pipe portion 321 of the second sleeve 32 are assembled together firmly. the

As shown in Figures 1, 3 and 4, the counting ring 5 includes a ring body 50, a plurality of hooks 52 and a locking portion 53, and the counting ring 5 is mounted on the second sleeve 32. In the assembly space, and sleeved on the outside of the driving part 401 of the rod body 40 of the injection push rod 4, a plurality of interference threads 51 are formed on the inner peripheral surface of the ring body 50, and the interference threads 51 are helical in a forward direction, and the interference threads 51 The thread 51 can selectively engage the driving thread section 404 of the rod body driving part 401, so that when the injection push rod 4 moves linearly in the injection sleeve group 3, the driving thread section 404 can be used to drive the counting wheel ring 5 to rotate; The hook pieces 52 and the locking portion 53 are formed in an annular arrangement on one end of the ring body 50 facing the partition portion 323. The plurality of hook pieces 52 are arranged at equal intervals, and are hooked by the hook pieces 52. Butt against the limit block 3242, so that the counting ring 5 can only rotate at a fixed point, and the end protrusion 3291 of the second sleeve 32 is against the gap between the ends of two adjacent hook pieces 52, and the locking part 53 The end is formed with a clamping concave edge 531, so that when the clamping concave edge 531 is clamped by the end protrusion 3291, the counting wheel ring 5 is clamped in the injection sleeve set 3 and cannot rotate, and can prevent the injection push rod 4 straight forward. the

As shown in Figure 1, the protective cover 6 includes a cover body, one end of the cover body is an open end, and the other end is a closed end, which is used to be sleeved on the outside of the injection needle and the first sleeve 31 of the injection sleeve set 3 , to prevent the user or others from being stabbed by the injection needle 2. In this preferred embodiment, the protective cover 6 can still form a strip-shaped clamping part on the side of the cover, so that the protective cover 6 can be clamped clamped on the object. the

The preferred embodiment of the utility model counting type syringe is in use, as shown in Fig. 1 and Fig. 5, Fig. 8, is that the medicament bottle 1 that fixed-dose injection medicament is housed is installed in the first sleeve 31 and the second sleeve. In the injection sleeve group 3 composed of the barrel 32, and make the rod body end block 403 on the rod body 40 of the injection push rod 4 in the second sleeve 32 abut against the piston 1A in the medicine bottle 1, and then inject The needle 2 is sleeved on the needle connection end 311 of the injection sleeve set 3, and the needle body puncture section of the injection needle 2 pierces through the closing cap of the medicine bottle 1 and extends into the medicine bottle 1 for injection by the user. After the medicine bottle is used, it can also be taken out from the counting syringe, and the counting syringe can be used repeatedly. the

When the preferred embodiment of the counting syringe injects medicaments on the human body, the user pushes the injection push rod 4 to push the piston 1A in the medicament bottle 1, so that the medicament in the medicament bottle 1 enters the human body through the injection needle. When the rod 4 is pushed straight forward, the driving thread segment 404 on the rod body 40 is driven by the engagement of the interference thread 51 on the inner surface of the ring body 50 of the counting ring 5 to make the counting ring 5 rotate by one grid (that is, spanning one grid). hook piece 52), counted as one use. the

When the injection medicine in the medicine bottle 1 of the counting syringe is used up, the injection push rod 4 can be used to rotate and pull out in the opposite direction in a labor-saving manner. The driving thread section 404 on the outer peripheral surface of the rod body 40 of the rod 4 is a forward thread, so the rod body 40 of the injection push rod 4 slides through the ring body 50 of the counting ring 5, and the counting ring 5 does not rotate. the

In this way, the counting syringe can be used repeatedly, and each time the syringe is used for injection, the linear movement of the injection push rod 4 in the injection sleeve set 3 is used to drive the counting ring 5 to rotate by one cycle through the driving thread segment 404. When the number of repeated use of the syringe reaches the set number of times, the counting ring 5 is stuck on the injection sleeve set 3, so that the function of the syringe becomes invalid and cannot be used again. the

As can be seen from the above description, in the counting syringe proposed by the utility model, only the needle related to the safety of use and the medicament bottle containing the fixed-dose injection medicament are used as disposable components, and the rest of the combined injection sleeve group, The injection push rod and the protective cover can be reused many times, and when the number of times of use of the counting syringe reaches the predetermined number of times, the efficacy of the syringe will be invalidated and it cannot be used, ensuring that the counting syringe is free from Excessive reuse to preserve the safety of syringe use. the

The above description is only the preferred embodiment of the present utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with the preferred embodiment, it is not intended to limit the utility model. Skilled persons, within the scope of the technical solution of the utility model, should be able to use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes. The technical essence of the utility model makes any simple modifications, equivalent changes and modifications to the above embodiments, all still belong to the scope of the technical solutions of the utility model. the

Claims (6)

1. A counting syringe, characterized in that it comprises: An injection sleeve set, which includes a hollow first sleeve and a hollow second sleeve, the first sleeve is used to provide a medicine bottle, one end of the first sleeve has a needle connection end, the needle The connecting end is used to provide an injection needle assembly thereon, the other end of the first sleeve has an engaging end, the second sleeve includes a socket pipe part and an extension pipe part connected to one end of the socket pipe part, and The joint ends of the first sleeve are detachably assembled with the socket pipe part, a partition part is formed inside the second sleeve between the socket pipe part and the extension pipe part, and a partition part passes through the partition part and There is a shaft tube part with a middle hole, and the second sleeve forms a ring part connecting the partition part on the periphery of the shaft tube part facing the first sleeve part, the inner wall of the ring part forms at least one end protrusion, and the shaft tube part faces The outer peripheral surface of one end section of the first sleeve has two radially opposite limit stops, and there is a distance between the limit stops and the partition; An injection push rod is movably installed in the injection sleeve group and can be connected to the piston in the medicine bottle. The injection push rod includes a rod body and an operating part, and one axial end of the rod body is a The other end of the rod body in the axial direction is a rod connection part, the rod connection part of the rod body protrudes outside the second sleeve, the operating part is located outside the second sleeve to connect the rod connection part, and the rod body is formed on the outer peripheral surface of the drive part. a driving thread segment, the plurality of driving thread segments are arranged in succession along the axial direction of the rod body, the driving thread segment comprises a plurality of adjacent parallel thread bars, and the plurality of thread bars in the adjacent driving thread segments are connected in a forward spiral; as well as A counting wheel ring, including a ring body, a plurality of hooks and a locking part, the ring body is installed in the second sleeve, and sleeved on the outside of the driving part of the rod body of the injection push rod, the ring A plurality of forward-helical interference threads are formed on the peripheral surface of the body, and the interference threads can selectively engage the driving thread section of the driving part of the rod body. The side end of the part, the plurality of hook pieces are arranged at equal intervals, the hook pieces are hooked against the limit stopper, so that the counting wheel ring can only rotate at a fixed point, and the end protrusion of the second sleeve is against the The gap between the ends of two adjacent hook pieces, the end of the locking part has a locking concave edge, the linear movement of the injection push rod in the injection sleeve group can make the rod body drive the threaded section to drive the counting ring to rotate one grid, and The counting wheel ring is rotated until the end projection is locked at the locking concave edge of the locking part and is locked and fixed. the 2. The counting syringe according to claim 1, wherein a plurality of hooks arranged at intervals are formed on the side end of the joint end of the first sleeve, and the partition part connects the second sleeve The inner space of the cylinder is divided into an assembly space located in the sleeve pipe part and an activity space located in the extension pipe part. The outer peripheral surface of the sleeve pipe part forms an outwardly protruding fin part. The assembly space of the second sleeve is in the An assembly port is formed at the outer end of the socket pipe part, and a clamping flange is formed adjacent to the assembly port in the movable space of the socket pipe part, and a plurality of pressing spring pieces are formed on the outer peripheral wall of the socket pipe part and slots are formed around the pressing spring pieces, The clamping flange can be hooked with the hook at the joint end of the first sleeve, and the pressing elastic piece can be pressed to push against the clamping hook and disengage from the clamping flange. the 3. The counting syringe according to claim 2, wherein the shaft tube portion of the second sleeve includes a first section located in the assembly space and a second section located in the activity space, so The inner wall of the extended tube part of the second sleeve forms two radially corresponding guide projections; the injection push rod includes a sliding sleeve, and the sliding sleeve has a sleeve body and a fixed part formed at one end of the sleeve body. The sleeve body can movably extend into the activity space of the extension tube part of the second sleeve and is sleeved on the outside of the shaft tube part, and the fixed part is combined with the rod connection part of the rod body and the operating part to be able to move together; Two guide grooves are distributed on the outer peripheral surface of the sleeve, and each of the guide grooves has an axially extending straight groove portion and a spiral groove portion, and the straight groove portion has a first groove end and a second groove end respectively Located at both ends of the axial direction, the spiral grooves are respectively located between two adjacent straight grooves, and from the first groove end of the straight groove in the two adjacent straight grooves, the first groove spirals 180 degrees to connect to the other adjacent straight groove The second groove end of the part, the two guide grooves on the sleeve body of the sliding sleeve respectively provide two radially corresponding guide projections on the inner wall of the extension tube part of the second sleeve to extend into it. the 4. The counting syringe according to claim 3, characterized in that, the end of the second section of the shaft tube portion of the second sleeve forms two radially corresponding shrapnel portions, and the ends of the shrapnel portions each An abutment protrusion with a single slope is formed, and a plurality of single oblique chute parts are formed on the inner peripheral surface of the sliding sleeve, and the abutment protrusion at the end of the elastic part of the shaft tube part of the second sleeve abuts against the chute Ministry. the 5. The counting syringe according to claim 4, characterized in that, the sliding sleeve forms an annular baffle with an inner hole inside one end of the connecting operation member and a ring from the edge of the inner hole to the end of the fixed part. The connection part extending in the direction of the connection part forms a joint space between the connection part and the inner wall of the fixed part. A plurality of slits extending axially from the end of the connection part are arranged on the peripheral wall of the connection part, so that the connection part has the elasticity of expansion and recovery. The sliding sleeve A plurality of clamping holes are formed adjacent to the annular baffle on the fixed part of the joint, and the clamping holes communicate with the assembly space; A radially protruding ring flange is formed on the rod connecting part of the rod body, and a flange is formed at the end of the rod connecting part. The flange abuts against the side end of the annular baffle, and the flange abuts against the end of the connecting part to form a combination; The operating part includes a knob part and an axially protruding sleeve pipe part formed inside the knob part, a plurality of fixed hooks are formed at the end of the sleeve pipe part, and the operation part is sleeved on the fixing part of the sliding sleeve by the knob part On the outside, the fitting pipe part extends into the assembling space of the fixing part and is sleeved on the outside of the connecting part, and the plurality of fixing hooks are respectively buckled in the locking holes of the fixing part of the sliding sleeve. the 6. The counting syringe according to any one of claims 2 to 5, characterized in that, a plurality of alignment protrusions are formed on the side of the joint end of the first sleeve, each alignment protrusion The hooks are arranged in a staggered manner; the socket pipe part of the second sleeve further forms a plurality of alignment concave parts corresponding to the alignment convex parts at the assembly port, and the alignment convex parts and the alignment concave parts are concave-convex. Cooperate. the

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