CN203090111U - Metering type injector - Google Patents

Abstract

The utility model relates to a metering syringe, which comprises an injection sleeve group, an injection push rod and a dose display wheel ring, wherein the injection sleeve group which can be detachably assembled provides a medicine bottle and an injection needle group, the injection push rod and a dose display component are arranged inside the injection sleeve group, the outer peripheral surface of the ring body of the dose display wheel ring is provided with a dose value which can be displayed through a window of the injection sleeve group, the inner part of the ring body is provided with a plurality of passive threads of a forward spiral, the outer peripheral surface of the driving part of the injection push rod passing through the ring body is provided with a plurality of driving thread segments which are continuously arranged along the axial direction, the driving thread segments are meshed with the passive threads in the ring body with their forward spiral threads, and in the process of using the syringe for injection, the injection push rod is used to move linearly in the injection sleeve group, so that the rod body driving thread segment drives the dose display wheel ring and presents the dose value in the display window, so that the user can easily judge the injected dose.

Description

metered syringe

technical field

The utility model relates to a syringe, in particular to a metering syringe capable of displaying injection dosage values. 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, resulting in a heavy burden on the treatment, and the amount of syringe waste after use is too much. the

Furthermore, when the user uses the existing syringe to inject the injection medicine into the human body, because the syringe lacks an easy-to-read injection medicine dose display mechanism, it is inconvenient for the user to use the syringe. the

Utility model content

The main purpose of the utility model is to provide a metering syringe, hoping to improve the shortcomings of existing syringes that cannot directly display the injection dose value. the

In order to achieve the aforementioned purpose, the metered syringe system proposed in this creation 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 connecting end is used to provide an injection needle assembly on it, the other end of the first sleeve has an engaging end, the second sleeve includes a sleeve part and an extension tube connected to one end of the sleeve part, And the joint end of the first sleeve is detachably assembled with the socket pipe part, and a display window is provided on the socket pipe part of the second sleeve;

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 provided with a A plurality of driving thread segments, the plurality of driving thread segments are arranged continuously along the axial direction of the rod body, the driving thread segments include a plurality of adjacent parallel thread bars, and the plurality of thread bars in the adjacent drive thread segments are in a forward spiral articulation; and

A dose display wheel ring, which includes a ring body, 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, and several doses are arranged around the outer surface of the ring Numerical value, the dose numerical value corresponds to the display window, and the inner peripheral surface of the ring is provided with a plurality of forward spiral passive threads, and the passive threads are engaged with part of the driving thread section of the rod body driving part, through the injection push rod in the injection sleeve When the barrel group moves linearly, the rod body of the injection push rod is used to drive the threaded section to drive the ring body to rotate and display the dose value in the display window. the

Through the above-mentioned utility model metering syringe, its injection sleeve set, injection push rod, dose display wheel ring and other components have the function of being reusable for many times, and the syringe further makes the dose installed inside the injection sleeve set The outer peripheral surface of the ring of the display wheel ring is provided with the dose value that can pass through the display window of the injection sleeve group, and there are multiple forward-helical passive threads inside the ring body. When the rod body of the injection push rod passes through the ring body, it is driven The outer peripheral surface of the part is provided with a plurality of driving thread segments arranged continuously in the axial direction, and the forward helical thread bar of the driving thread segment is engaged with the passive thread in the ring body, passing through the injection sleeve group of the metering syringe After the medicine bottle is installed and the injection needle is connected, in the process of human injection, when the injection push rod is used to move linearly in the injection sleeve group to push the medicine in the medicine bottle, the rod body of the injection push rod is used to drive the threaded section The ring body is driven to rotate and the dose value is displayed in the display window, so that the user can easily judge the injected dose. the

Description of drawings

Fig. 1 is a three-dimensional exploded schematic diagram of a preferred embodiment of the metering syringe of the present invention, a medicine bottle and an injection needle. the

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

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

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

Fig. 5 is a schematic cross-sectional view of the combination of the preferred embodiment of the metering 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 the secant line 6-6 in FIG. 5 . the

FIG. 7 is a schematic cross-sectional view of the position of the secant line 7-7 in FIG. 5 . the

Fig. 8 is a combined cross-sectional schematic view of another viewing angle of the preferred embodiment of the metering injector shown in Fig. 1 combined with the medicament bottle and the injection needle. the

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

Fig. 10 is a reference diagram (1) of the usage state of the preferred embodiment of the metering syringe shown in Fig. 1 in combination with the medicament bottle and the injection needle. the

Fig. 11 is a reference diagram (2) of the usage state of the preferred embodiment of the metering syringe shown in Fig. 1 in combination with the medicament bottle and the injection needle. the

Explanation of reference numbers:

1 medicine bottle 1A piston

2 injection needles

3 injection sleeve set

31 The first sleeve 311 Needle connection end

312 joint end 313 hook

315 Wing Department

32 Second sleeve 321 Sleeve pipe part

322 extension pipe part 323 partition part

324 shaft tube part 3241 shrapnel part

3242 limit stopper 3243 raised strip

3244 guide bump 3245 abutment bump

326 card flange

327 Press shrapnel 328 Display window

329 ring part 3291 end bump

4 injection push rod

40 rod body 401 drive unit

402 rod connection part 403 rod body end block

404 drive thread section 405 ring flange

406 flange

41 Operating parts 411 Knob part

412 Fitting pipe part 413 Fixed hook

42 sliding sleeves 421 sleeves

422 fixed connection part 4221 card connection hole

423 guide groove 424 ring baffle

425 connecting part 426 chute part

5 dose display wheel ring 50 ring body

51 passive thread 52 hook piece

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

Please refer to FIG. 1 , which is a preferred embodiment of the metering syringe of the present invention. The metering syringe is assembled with a disposable medicament bottle 1 and a disposable injection needle 2 for medicament injection. The disposable medicine bottle 1 includes a transparent bottle body containing medicine for injection. One end of the bottle body is hermetically assembled with a closed end cap. The moving piston 1A; the disposable injection needle 2 is mainly an injection needle with a needle hole inside fixed in the socket part, and the section where the injection needle protrudes out of the socket part is the injection section. The section is the puncture section, and the puncture section is used to pierce through the closing cap of the medicament bottle 1 and extend into the medicament bottle 1 . the

Please refer to Fig. 1, the composition of the metering syringe of the present utility model mainly includes: an injection sleeve group 3, an injection push rod 4 and a dose display wheel ring 5, or further includes a protective cover 6, wherein :

Please refer to FIG. 1 and FIG. 2, the injection sleeve set 3 includes a first sleeve 31 and a second sleeve 32, and the first sleeve 31 is a hollow body with an axial penetration inside. , to provide the medicine bottle 1 set therein, one end of the first sleeve 31 has a needle connection end 311, and the other end has a joint end 312, please refer to FIG. 5, the needle connection end 311 is used to provide one end of the medicament bottle 1 with a closed cap to protrude into it, and to provide the socket part of the injection needle 2 to be sleeved on it, so that the injection needle 2 can be inserted into the medicament bottle 1 . In this preferred embodiment, the first sleeve 31 has a plurality of hooks 313 arranged at intervals on the side of the joint end 312, and the hooks 313 and the second sleeve 32 can be disassembled by means of snap-fit combination. Combined together, the outer peripheral surface of the joint end portion 312 has an outwardly protruding wing portion 315 . the

Please refer to FIG. 1 and FIG. 2, the second sleeve 32 is a hollow body that is axially penetrated inside, and the second sleeve 32 includes a socket pipe portion 321 and a sleeve pipe portion 321. The extension tube part 322 at one end, 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 The medicine bottle 1 is fixed therein. the

Please refer to Fig. 1, Fig. 4, Fig. 5 and Fig. 9, the inside of the second sleeve 32 has a partition 323 between the sleeve pipe part 321 and the extension pipe part 322 and has a The shaft tube part 324 of 323 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 Provide the position where the medicine bottle 1 abuts, the assembly space of the second sleeve 32 has an assembly opening at the outer end of the socket pipe part 321, and the socket pipe part 321 is provided with a locking protrusion adjacent to the assembly port in the movable space The edge 326 and the outer peripheral wall of the sleeve pipe part 321 have a plurality of pressing elastic pieces 327, and there are slots around the pressing elastic pieces 327, so that the end of the pressing elastic pieces 327 adjacent to the clamping 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 sleeve pipe portion 321 of the second sleeve 32, the hook 313 is hooked on the locking flange 326, and the pressing elastic piece 327 can be used to push the hook 313 out of the locking The flange 326 is made so that the joint end portion 312 of the first sleeve 31 can be disassembled from the socket pipe portion 321 of the second sleeve 32, and the second sleeve 32 is provided with at least one socket penetrating from the outer peripheral surface at the socket pipe portion 321. To the display window 328 of the internal assembly space, in this preferred embodiment, the display window 328 is located on the side of the pressing elastic piece 327 . 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. There is a ring portion 329 connecting the partition portion 323 on the periphery of the first section of 324, and the shaft tube portion 324 has a middle hole axially penetrated, and the ends of the second section of the shaft tube portion 324 have two radially corresponding and have Elastic shrapnel part 3241, each end of the shrapnel part 3241 has an abutment protrusion 3245, and the abutment protrusion 3245 has a single oblique slope, the ring part 329 on the periphery of the first section of the shaft tube part 324 The inner wall has one or more end protrusions 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, and the limit stoppers 3242 and the partition part There is a distance between 323, and the second sleeve 32 can also be provided with a plurality of axially extending and spaced protrusions 3243 on the inner wall of the extension tube 322, and there can be two protrusions 3243 on the inner wall of the extension tube 322 The radially corresponding guiding protrusions 3244 . the

Please refer to FIG. 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. The injection push rod 4 Including a rod body 40 and an operating part 41, wherein:

Please refer to FIG. 1 and FIG. 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 contact the medicine bottle 1 Piston 1A inside, or, driving part 401 is combined with a circular rod body end block 403, with this rod body end block 403 abutting against the piston 1A of medicine bottle 1, the rod connection part 402 of rod body 40 protrudes from the injection sleeve set 3 Outside the second sleeve 32, the rod body 40 has a plurality of driving thread segments 404 on the outer peripheral surface of the driving part 401, and these driving thread segments 404 are arranged continuously in at least one straight line along the axial direction of the rod body 40, and the driving thread segments 404 include A plurality of adjacent parallel and forward spiral thread strips, and the plurality of thread strips in the adjacent driving thread segment 404 are connected in a forward spiral, the number of segments of the driving thread segment 404 is adjusted according to the actual size of the pharmaceutical bottle installed, Please refer to FIG. 3 and FIG. 6 . In this preferred embodiment, the driving portion 401 of the rod body 40 has two straight and diametrically opposite 18 driving thread segments 404 . the

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

Please refer to Figure 1, Figure 4, Figure 8 and Figure 9, in this preferred embodiment, the injection push rod 4 also includes a sliding sleeve 42, the sliding sleeve 42 includes a sleeve body 421 and a molded in The fixed part 422 at one end of the sleeve body 421, the sleeve body 421 can movably extend into the activity space of the extension tube part 322 of the second sleeve 32 and is sleeved on the outside of the shaft tube part 324, the second sleeve 32 The plurality of protrusions 3243 in the extension 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, the outer peripheral surface of the sleeve body 421 is provided with two guide grooves 423, the straight groove parts of the two guide grooves 423 are arranged in a radial direction, and the spiral The grooves spiral 180 degrees along the direction and are connected between two adjacent straight grooves. Please refer to Fig. 1, Fig. 8 and Fig. 9, the two guide grooves 423 on the sleeve body 421 of the sliding sleeve 42 respectively provide two radially corresponding guides on the inner wall of the extension tube portion 322 of the second sleeve 32. The protrusion 3244 protrudes into it, and when the guide protrusion 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; After the push rod 4 pushes the piston 1A in the medicament bottle 1 to complete the injection, the guide protrusion 3244 moves to one end of the spiral groove of the guide groove 423. When the user wants to withdraw the injection push rod 4, he can rotate and pull out the injection push rod 4 , using the spiral method to rotate in the opposite direction reduces the resistance when the injection push rod 4 moves, and has less labor-saving operation convenience. the

Please refer to Fig. 1, Fig. 8 and Fig. 9, in this preferred embodiment, the inner peripheral surface of the sliding sleeve 42 has a plurality of single oblique chute portions 426, providing the shaft tube portion of the second sleeve 32 The abutment projection 3245 at the end of the elastic part 3241 of 324 is abutted in the chute 426, and the end of the sliding sleeve 42 used to connect the operating part 41 has an annular baffle plate 424 with an inner hole and a self-inner hole. The edge of the connecting part 425 extends toward the end of the fixed part 422. There is an assembly space between the connecting part 425 and the inner wall of the fixed part 422. The peripheral wall of the connecting part 425 is distributed with a plurality of slits extending axially from the end. , so that the connecting part 425 has the elasticity of expansion and recovery, and the fixed part 422 of the sliding sleeve 42 is provided with a plurality of clamping holes 4221 adjacent to the annular baffle 424, and the clamping holes 4221 communicate with the assembly space. There is a radially protruding ring flange 405 on the rod connecting portion 402 of 40, the end of the rod connecting portion 402 is provided with a flange 406, 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 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

Please refer to FIG. 1 , FIG. 5 and FIG. 8 , the operating member 41 is located outside the second sleeve 32 to assemble the rod connecting portion 402 and the sliding sleeve 42 of the rod body 40 , and the operating member 41 includes a knob portion 411 And a fitting pipe part 412 formed in the inside of the knob part 411 and protruding axially. There are a plurality of fixing hooks 413 at the end of the fitting pipe part 412. part 422 outside, and the sleeve pipe part 412 extends into the assembly space in the fixed part 422 and is sleeved on the outside of the connecting part 425, and the plurality of fixed hooks 413 are buckled on the fixed part 422 of the sliding sleeve 42 respectively. In the clamping hole 4221 , 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 also be provided with a concave-convex non-slip portion. the

Please refer to the preferred embodiment shown in FIG. 1 , the side end of the joint end 312 of the first sleeve 31 can further be provided with a plurality of alignment protrusions, and the alignment protrusions and the hooks 313 are arranged in a staggered manner; the socket pipe portion 321 of the second sleeve 32 can also be further provided with a plurality of alignment recesses corresponding to the alignment protrusions at its assembly port, through the alignment of the alignment protrusions and the alignment recesses The concavo-convex fits together, 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

Please refer to Figure 1 and Figure 3, the dose display wheel ring 5 includes a ring body 50, the ring body 50 is installed in the assembly space of the second sleeve 32, and sleeved on the injection push rod 4 outside the driving part 401 of the rod body 40, the outer peripheral surface of the ring body 50 encircles several dose values (such as: 0, 5, 10, 15, 20, 25, where 5 represents 0.5ml, and so on), the dose The value corresponds to the display window 328. There are a plurality of passive threads 51 on the inner peripheral surface of the ring body 50. The passive threads 51 are forward spiral, and the passive threads 51 are engaged with the part of the driving thread segment 404 of the rod driving part 401. In this way, when the injection push rod 4 moves linearly in the injection sleeve set 3 , each driving thread segment 404 continuously drives the ring body 50 to rotate. the

Please refer to Fig. 1, Fig. 3, Fig. 5 and Fig. 7. In the aforementioned dose display wheel ring 5, a plurality of hook pieces 52 protrude from the end ring of the ring body 50 facing the partition part 323, so that The plurality of hook pieces 52 are arranged at equal intervals, and the hook pieces 52 are hooked against the limit stopper 3242, so that the dose display wheel ring 5 can only rotate at a fixed point, and the end of the second sleeve 32 The bump 3291 abuts against the gap between the ends of two adjacent hook pieces 52, thereby serving as a scale function. For example, the side end of the ring body 50 has 36 pieces of hook pieces 52, that is, between every two hook pieces 52. The interval is 10 degrees to facilitate the setting of the injection stroke. the

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

When the preferred embodiment of the metering syringe of the present utility model is in use, please refer to Fig. 1 and Fig. 5 and shown in Fig. 8, the medicament bottle 1 containing the fixed-dose injection medicament is installed in the first sleeve 31 and the second In the injection sleeve group 3 composed of the sleeve 32, the rod body end block 403 on the rod body 40 of the injection push rod 4 assembled in the second sleeve 32 is abutted against the piston 1A in the medicine bottle 1, and then the The injection needle 2 is sleeved on the needle connection end 311 of the injection sleeve set 3, and the needle puncture section of the injection needle 2 pierces through the closing cap of the medicine bottle 1 and extends into the medicine bottle 1, providing the user with an injection. After the medicine bottle is used, it can also be taken out from the metering syringe, and the metering syringe can be used repeatedly. the

When the preferred embodiment of the metering syringe is used for injecting medicaments on the human body, the user pushes the piston 1A in the medicament bottle 1 by pushing the injection push rod 4, so that the medicament in the medicament bottle 1 enters the human body through the injection needle. The driving thread segment 404 on the rod body 40 cooperates with the passive thread 51 on the inner surface of the ring body 50 of the dose display wheel ring 5, and the dose display wheel ring 5 is rotated when the injection push rod 4 is pushed straight forward. Please refer to As shown in FIG. 9 and FIG. 10 , the dose value on the outer peripheral surface of the ring body 50 is displayed at the display window 328 of the second sleeve 32 , so that the user can directly see the injected dose. the

When the injection medicament in the medicament bottle 1 of the metering 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 threaded sections 404 on the outer peripheral surface of the rod body 40 of the rod 4 are all forward threads, so the rod body 40 of the injection push rod 4 slides through the ring body 50 of the dose display wheel ring 5, and the dose display wheel ring 5 does not rotate. the

As can be seen from the above description, in the metering syringe proposed by the utility model, only the safety needle and the medicament bottle containing the fixed-dose injection medicament are disposable components, and the rest of the combined injection sleeve group, injection pusher, etc. Both the rod and the protective cover can be reused many times, and when the metering syringe is in use, the injected dose value can be directly displayed in the injection sleeve set, so that the user can control the injected medicament. the

The above description is only the preferred embodiment of the present utility model, and is not to limit the present 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, any technical field Within the scope of the technical solution of the utility model, those skilled in the art should be able to use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the utility model, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model. the

Claims (7)

1. A metering 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 connecting end is used to provide an injection needle assembly on it, the other end of the first sleeve has an engaging end, the second sleeve includes a sleeve part and an extension tube connected to one end of the sleeve part, And the joint end of the first sleeve is detachably assembled with the socket pipe part, and a display window is provided on the socket pipe part of the second sleeve; 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 provided with a A plurality of driving thread segments, the plurality of driving thread segments are continuously arranged along the axial direction of the rod body, the driving thread segments include a plurality of adjacent parallel thread bars, and the plurality of thread bars in the adjacent drive thread segments are in a forward spiral articulation; and A dose display wheel ring, which includes a ring body, 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, and several doses are arranged around the outer surface of the ring Numerical value, the dose numerical value corresponds to the display window, there are a plurality of forward helical passive threads on the inner peripheral surface of the ring, and the passive threads are engaged with part of the driving thread section of the driving part of the rod body, through the injection push rod on the injection sleeve When moving linearly within the group, the rod body of the injection push rod is used to drive the threaded section to drive the ring body to rotate and display the dose value in the display window. the 2. The metering syringe according to claim 1, wherein a plurality of hooks arranged at intervals are provided on the side of the joint end of the first sleeve, and fins are provided on the outer peripheral surface of the joint end. part, the second sleeve has a partition between the sleeve pipe part and the extension pipe part and has a shaft tube part passing through the partition part, and the partition part divides the inner space of the second sleeve into a An assembly space in the socket pipe part and an activity space located in the extension pipe part, the assembly space of the second sleeve has an assembly opening at the outer end of the socket pipe part, and the socket pipe part has an assembly opening adjacent to the assembly opening in the activity space The clamping flange has a plurality of pressing shrapnels on the outer peripheral wall of the sleeve pipe and slots are arranged around the pressing shrapnels. The locking flange can be hooked to the hook at the joint end of the first sleeve, and the pressing shrapnels can be pressed and released. Push the hook to disengage from the locking flange. the 3. The metering syringe according to claim 2, wherein the shaft tube portion of the second sleeve comprises a first section located in the assembly space and a second section located in the activity space, the second The sleeve has a ring part connected to the partition part on the periphery of the first section of the shaft tube part. The shaft tube part has a middle hole axially penetrating through it. The end bump, the outer peripheral surface of the first section of the shaft tube part has two radially opposite limit stops, and there is a distance between the limit stoppers and the partition part; There are a plurality of hook pieces protruding from one end ring of the plate, and the plurality of hook pieces are arranged at equal intervals, and the hook pieces are hooked against the limit stopper, so that the dose display wheel ring can only rotate at a fixed point , the end projection of the second sleeve abuts against the gap between the ends of two adjacent hook pieces. the 4. The metering syringe according to claim 3, wherein the inner wall of the extension tube of the second sleeve has two radially corresponding guide projections; the injection push rod includes a sliding sleeve, and the sliding sleeve The sleeve has a sleeve body and a fixing part arranged 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 outside the shaft tube part. The fixing part The rod connection part of the rod body and the operating part are assembled 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 part and a spiral groove part, The straight groove portion has a first groove end and a second groove end respectively located at two ends of the axial direction, the spiral groove portion is respectively located between two adjacent straight groove portions, and from the two adjacent straight groove portions The first groove end of the straight groove part spirals 180 degrees and connects the second groove end of the other straight groove part adjacent to the side. The two guide grooves on the sleeve body of the sliding sleeve respectively provide two inner walls of the extension pipe part of the second sleeve. The radially corresponding guide projections protrude into it. the 5. The metering syringe according to claim 4, wherein the end of the second section of the shaft tube portion of the second sleeve has two radially corresponding shrapnel portions, and each end of the shrapnel portion has a The abutment protrusion has a single slope, and the inner peripheral surface of the sliding sleeve is provided with a plurality of single oblique chute parts, and the abutment protrusion at the end of the elastic part of the shaft tube part of the second sleeve abuts against the chute part middle. the 6. The metering syringe according to claim 5, wherein the sliding sleeve has an annular baffle with an inner hole inside one end of the connecting operation member and a ring extending from the edge of the inner hole toward the end of the fixed part. There is a connecting space between the connecting part and the inner wall of the fixed part, and a plurality of slits extending axially from the end of the connecting part are distributed on the surrounding wall of the connecting part, so that the connecting part has the elasticity of expansion and recovery. The fixed part of the sliding sleeve There are multiple clamping holes adjacent to the annular baffle on the connecting part, and the clamping holes communicate with the assembly space; There is a radially protruding ring flange on the rod connecting part of the rod body. There is a flange at the end of the rod connecting part. The rod body extends into the inside of the sliding sleeve. 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 fixing hooks are provided at the end of the sleeve pipe part. Outside the connecting part, the sleeve pipe part extends into the assembling space of the fixing part and is sleeved outside the connecting part, and the plurality of fixing hooks are respectively snapped into the fastening holes of the fixing part of the sliding sleeve. the 7. The metering syringe according to any one of claims 2 to 6, wherein a plurality of alignment protrusions are provided on the side of the joint end of the first sleeve, and the alignment protrusions The hooks are arranged in a staggered manner; the socket pipe part of the second sleeve is further provided with 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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