CN105288790B - Syringe with a needle - Google Patents

Abstract

The invention discloses a syringe, which is used in combination with a medicine bottle and a needle. The syringe comprises an outer protective shell, a coupling collar, a medicine bottle shell, an inner sleeve, a bidirectional spiral guide tube group, a screw connection ring, a one-way ratchet, a spiral push rod and an injection push rod group. The coupling collar is arranged at the front end of the outer protective shell, and the medicine bottle is arranged in combination with the medicine bottle shell group. The inner sleeve, the bidirectional spiral guide tube group, the screw connection ring, the one-way ratchet, the spiral push rod and the injection push rod group are arranged inside the outer protective shell, so that the injection push rod group can be pulled back quickly in a straight direction, and then the injection push rod group can be pressed in a straight direction for injection. The large pitch stroke structure of the bidirectional spiral guide tube group is used in combination with the small pitch stroke structure between the screw joint and the spiral push rod, so that the straight pressing force is converted into a rotational force, and the large stroke rotation thrust is converted into a small stroke rotation injection thrust, so that the purpose of quantitative injection of medicine is achieved, and the labor-saving effect is achieved in a simple operation mode of cyclic opening and closing.

Description

syringe

technical field

The invention relates to a syringe, in particular to a syringe with the function of safely controlling the injection dose and saving labor in operation.

Background technique

In order to cope with the purpose of quantitative injection of medicine, counting the number of injections, and limited reusability of the syringe, currently known syringes are divided into two types: metering syringes and counting syringes. Among them, in the composition structure of the known metering syringe, it mainly installs a group of driving mechanism composed of a plurality of driving parts in a syringe housing and connects a push rod, so that the medicine bottle is installed in the syringe housing, and the front end of the syringe housing The needle is installed, and the needle is connected to the medicine bottle. When injecting, the needle penetrates into the predetermined part of the human body. After pressing the rear end of the push rod, the push rod is controlled by the driving part of the driving mechanism, and then the piston in the medicine bottle is pushed to move to the predetermined position. A predetermined dose of medicament is delivered through the needle through the stroke of the needle.

Although the above-mentioned known metering syringe achieves the purpose of quantitatively outputting medicine, the syringe is limited by the linkage between the driving parts of the driving mechanism of the syringe during the use and operation of the syringe, causing the syringe to operate when injecting medicine. strenuous question.

Contents of the invention

The object of the present invention is to provide a syringe to solve the problem of laborious operation of existing metering syringes.

The technical solution proposed by the present invention is to provide a syringe for use in combination with a medicine bottle and a needle, and the syringe includes:

An outer shell, which is a hollow body with an opening formed at the front end and the rear end;

An engaging collar is assembled on the front end of the outer shell, and the engaging collar has an inner ring part inside, and a one-way ratchet groove with a plurality of single oblique ratchet teeth is formed in the inner ring part;

A medicine bottle casing is assembled on the front end of the joint collar for fixing the medicine bottle therein, and the front end of the medicine bottle casing can be detachably assembled with the needle;

An inner sleeve is installed in the outer protective shell, and the front end of the inner sleeve is fixed in the joint collar;

A two-way helical guide tube set, which includes an outer helical catheter and an inner helical catheter, the outer helical catheter is installed in the inner casing, the outer helical catheter includes a helical part and a tube formed at the front end of the helical part At the end, the inner peripheral wall of the spiral tube part forms a spiral guide groove, and the outer peripheral surface of the pipe end forms a plurality of single oblique ratchet shrapnel. Above, the outer helical catheter can only rotate in one direction, the inner helical catheter is installed in the inner casing and the outer helical catheter, the outer peripheral surface of the inner helical catheter is provided with a plurality of helical guide blocks, and the helical guide blocks are placed in the outer helical The helical guide groove of the catheter enables the inner helical catheter to rotate in the outer helical catheter for a predetermined travel distance, and a unidirectional ratchet groove with multiple single oblique ratchets is formed inside the rear section of the inner helical catheter;

A threaded ring is set in the pipe end of the outer helical conduit, and a threaded hole is formed in the threaded ring;

A one-way ratchet is installed in the one-way ratchet groove of the internal helical catheter. The one-way ratchet includes a wheel body and a plurality of single oblique ratchet shrapnel formed on the outer peripheral surface of the wheel body. In the middle hole, the single oblique ratchet shrapnel of the one-way ratchet meshes with the single oblique ratchet in the one-way ratchet groove of the internal helical catheter;

A screw push rod, which includes a dose control section, threaded on the outer peripheral surface of the dose control section, a shaft hole is formed in the screw push rod, the screw push rod is installed in the two-way helical guide tube group, the dose of the screw push rod The control segment is screwed through the inside of the screw ring, and is used to protrude into the medicine bottle to exert a thrust; and

An injection push rod set, which includes an injection push rod and a push rod end cover. The injection push rod includes a rod body and a pressing end arranged at the rear end of the rod body. The rod body of the injection push rod passes through the one-way ratchet In the middle hole, and the rod body can slide axially through the shaft hole of the screw push rod. The rear end of the rod body and the pressing end of the injection push rod are located outside the inner helical conduit, and the end cover of the push rod is sleeved on the injection push rod. On the outside of the pressing end of the rod, the rear end of the inner helical catheter is pivotally arranged in the end cover of the push rod, so that the injection push rod group can be combined with the one-way ratchet, the two-way helical guide tube group, the screw connection ring and the helical push rod to cycle open and close. .

In the above-mentioned syringe, a backstop key and a limit stop are formed at the rear end of the inner sleeve, and a plurality of backstop rings are formed on the outer peripheral surface of the rear section of the inner helical conduit, and an axial guide of a predetermined length is provided. groove, the backstop key can stop at the backstop ring of the inner helical catheter to prevent the inner helical catheter from moving forward, and the backstop key is transformed to the axial guide groove so that the inner helical catheter can be driven to move forward. The limit retaining edge limits the backward movement position of the inner helical conduit.

In the syringe described above, the shape of the shaft hole of the screw push rod and the rod body of the injection push rod are non-circular correspondingly.

In the above-mentioned syringe, the outer peripheral surface of the threaded ring forms an axially extending positioning protrusion, and the inner wall of the tube end of the outer helical catheter forms a positioning recess, and through the combination of the corresponding positioning protrusion and the positioning recess, The threaded ring is positioned within the tube end of the outer spiral catheter.

In the above-mentioned syringe, the front and rear ends of the adapter collar are respectively an adapter ring part and a set of adapter ring parts, and the adapter ring part is placed and assembled in the outer protective shell, and the adapter collar is connected between the inner ring part and a set of adapter ring parts. A plurality of hooks are provided between the engaging ring parts, and an inner ring is installed between the engaging ring part and the inner ring part on the engaging ring part; the front end of the inner sleeve protruding into the inside of the engaging ring part is provided with a card slot, The hook of the engaging collar is correspondingly snapped into the slot, and the inner ring is sheathed outside the hook, so that the inner sleeve and the engaging collar are joined and fixed.

In the above-mentioned syringe, a piston top block is installed at the front end of the dose control section of the screw push rod.

The beneficial effect that the present invention can achieve is that through the invention of the overall combined structure of the aforementioned syringe, after the syringe is assembled with a medicine bottle, and after the needle is installed, the injection push rod can be pulled to the ready-injection position quickly in a straight-back manner. , and when pressing the injection push rod group straightly, through the combination structure of the large pitch stroke of the helical guide groove of the outer helical catheter and the helical guide block of the inner helical catheter, the screw hole of the matching screw joint and the thread of the helical push rod are small pitch The combined stroke structure converts the vertical pressing force into rotational force, and converts the thrust of large stroke rotation into the injection thrust of small stroke rotation, which not only achieves the purpose of quantitative injection of medicines and good safety in use, but also when the syringe is in use, Through the invention of the linkage mechanism of the injection push rod group combined with the one-way ratchet, the two-way helical guide tube group, the screw connection ring and the helical push rod, it can be opened and closed in a simple and convenient way during the quantitative injection operation. Achieve labor-saving effect.

The present invention can also use the combined structure of the backstop key of the inner sleeve and the backstop ring pattern of the inner helical catheter, so that the injection push rod set of the syringe must be pulled back to a predetermined position before the injection push rod set can be pressed. Injection, and the backstop key at the back end of the inner sleeve and the backstop ring pattern on the outer surface of the inner helical catheter have the function of blocking and limiting, and the inner helical catheter will not be accidentally pressed in the middle of being pulled out along with the injection push rod group and retract to ensure that each injection dose of the syringe can reach the set injection dose.

In addition, the syringe of the present invention also includes a pen cap, so that the syringe can only be covered with a pen cap when the needle is removed, ensuring that the syringe can be replaced with a new needle every time it is used.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

Fig. 1 is a three-dimensional exploded schematic view of a preferred embodiment of the syringe, needle and needle cover of the present invention.

Fig. 2 is a three-dimensional exploded schematic diagram of another viewing angle of partial components in the syringe shown in Fig. 1 .

Fig. 3 is a schematic cross-sectional view of the preferred embodiment of the syringe shown in Fig. 1 and Fig. 2 when the needle is not installed and the pen cap is covered.

FIG. 4 is a schematic side sectional view of the cutting line A-A shown in FIG. 3 .

FIG. 5 is a schematic side sectional view of the cutting line B-B shown in FIG. 3 .

Fig. 6 is an exploded view of the preferred embodiment of the syringe shown in Fig. 1 to Fig. 3 with the medicine bottle casing removed, and the pen cap, needle and needle cap.

Fig. 7 is a schematic cross-sectional view of the preferred embodiment of the syringe shown in Fig. 1 to Fig. 3 when the pen cap is removed, the needle and the needle cap are installed, and the push rod is pulled out to a predetermined position.

Fig. 8 is a schematic cross-sectional view of the preferred embodiment of the syringe shown in Fig. 1 to Fig. 3 when the needle cover is removed and the push rod is pressed to start injection.

Fig. 9 is a schematic cross-sectional view of the preferred embodiment of the syringe shown in Fig. 1 to Fig. 3 when the push rod is pressed and the injection of the quantitative medicine is completed.

Explanation of reference numbers:

1 syringe 2 vials

2A piston 3 needles

4 needle caps 5 pen caps

10 Outer shell 11 Joint end

20 Coupling collar 21 Coupling ring part

22 sets of ring parts 23 inner ring parts

24 one-way ratchet slot 25 hook

26 inner ring

30 medicine bottle casing

40 inner casing 41 card slot

42 Backstop key 43 Limit retaining edge

50 two-way helical guide tube set 51 outer helical catheter

511 Spiral tube part 512 Ring end wall

513 pipe end 514 spiral guide groove

515 ratchet shrapnel 516 positioning recess

52 inner helical catheter 521 helical guide block

522 Backstop Ring 523 Axial Guide Groove

524 one-way ratchet slot 525 pivot joint

60 threaded ring 61 threaded hole

62 positioning convex part

70 one-way ratchet 71 wheel body

72 single oblique ratchet shrapnel 73 middle hole

80 screw push rod 81 dosage control section

82 limit flange 83 shaft hole

84 piston top block

90 injection push rod group 91 injection push rod

911 rod body 912 pressing end

913 positioning block 92 push rod end cover

Detailed ways

In the following, the technical means adopted by the present invention to achieve the intended purpose of the invention will be further described in conjunction with the accompanying drawings and preferred embodiments of the present invention.

As shown in Figure 1 and Figure 2, it discloses a preferred embodiment of the syringe of the present invention. The syringe 1 is used in combination with the medicine bottle 2, the needle 3, and the needle cover 4. The composition of the syringe 1 mainly includes an outer shield Shell 10, an engaging collar 20, a medicine bottle casing 30, an inner sleeve 40, a two-way helical guide tube set 50, a screw ring 60, a one-way ratchet 70, a helical push rod 80 and a The injection push rod set 90 , alternatively, the syringe 1 further includes a cap 5 .

As shown in FIG. 1 and FIG. 2 , the outer protective shell 10 is a hollow body with openings formed at both front and rear ends, and the front end of the outer protective shell 10 is a joint end 11 .

As shown in Figures 1 and 2, the adapter collar 20 includes an adapter ring portion 21, a set of adapter ring portions 22 and an inner ring portion 23, and the assembly ring portion 22 and the adapter ring portion 21 are respectively located at the joint The front end and the rear end of the collar 20, the inner ring part 23 is located inside the joint collar 20, and the joint collar 20 is combined with the joint end 11 of the outer shell 10 with the joint ring part 21, and the inner ring part 23 Then a one-way ratchet groove 24 with a plurality of single oblique ratchet teeth is formed. As shown in Figure 3, in this preferred embodiment, the engagement collar 20 is provided with a plurality of hooks 25 between the inner ring portion 23 and the engagement ring portion 21, and the engagement collar 20 is located between the engagement ring portion An inner ring 26 may be further installed between 21 and the inner ring portion 23 .

As shown in FIG. 1 and FIG. 2 , the medicine bottle casing 30 is assembled on the joint ring portion 21 at the front end of the joint collar 20 to fix a medicine bottle 2 therein. The front end of the medicine bottle casing 30 can be used for a set of 3 needles on it.

As shown in Figures 1 to 3, the inner sleeve 40 is installed inside the outer casing 10, the front end of the inner sleeve 40 extends into the joint ring part 21 of the joint collar 20, and is sleeved on the inner ring The outer part 23 is fixed. In this preferred embodiment, the front end of the inner sleeve 40 extending into the engagement collar 20 is provided with a slot 41, and the slot 41 provides the hook 25 of the engagement collar 20 to snap into it, and The inner ring 26 is sleeved on the outside of the hook 25, so that the inner sleeve 40 is engaged and fixed with the engagement ring 20, and the rear end of the inner sleeve 40 can extend out of the outer shell 10, and the rear end of the inner sleeve 40 forms a A backstop key 42 and a limit retaining edge 43 .

As shown in Figures 1 to 3, the two-way helical guide tube set 50 includes an outer helical catheter 51 and an inner helical catheter 52, the outer helical catheter 51 is installed in the inner sleeve 40, the outer helical catheter 51 includes a spiral tube portion 511, the front end of the spiral tube portion 511 forms a ring end wall 512 and a tube end 513 protruding forward from the ring end wall 512, the inner peripheral wall of the spiral tube portion 511 forms a spiral guide groove 514, and the tube end 513 A plurality of single oblique ratchet shrapnel 515 are formed on the middle and outer peripheral surface, and an axially extending positioning recess 516 is provided on the inner wall of the pipe end 513, as shown in Fig. 3 and Fig. 4 , the pipe end 513 of the outer helical conduit 51 extends into the joint collar In the inner ring portion 23 of 20, the ratchet shrapnel 515 abut against the single oblique ratchet teeth of the one-way ratchet groove 24 of the engaging collar 20, so that the outer helical catheter 51 can only rotate in one direction.

As shown in Figures 1 to 3, in the two-way helical guide tube set 50, the inner helical catheter 52 is installed in the inner sleeve 40 and the outer helical catheter 51, and the outer peripheral surface of the front section of the inner helical catheter 52 is set There are a plurality of helical guide blocks 521, and the helical guide blocks 521 are inserted into the helical guide groove 514 of the outer helical catheter 51, and through the cooperation of the helical guide blocks 521 and the helical guide groove 514, the inner helical catheter 52 can be aligned with the outer helical catheter 51. The middle rotation travels a predetermined travel distance, and a plurality of backstop rings 522 arranged at intervals are formed on the outer peripheral surface of the rear section of the inner helical conduit 52, and has an axial guide groove 523 of a predetermined length. The backstop rings 522 are single oblique A unidirectional ratchet groove 524 with a plurality of single oblique ratchets is formed inside the rear section of the inner helical conduit 52 , and the single oblique ratchet of the unidirectional ratchet groove 524 is engaged with the one-way ratchet in the collar 20 The single oblique ratchet teeth of the groove 24 are in the same oblique direction, and the rear end of the inner helical conduit 52 forms a pivot joint 525, and the pivot joint 525 of the inner helical conduit 52 can extend outside the rear end of the inner sleeve 40, behind the inner sleeve 40 The backstop key 42 at the end can switch positions between the backstop ring pattern 522 at the rear section of the inner helical conduit 52 and the axial guide groove 523 . As shown in Figure 3 and Figure 5, when the backstop key 42 extends into the axial guide groove 523, the inner helical conduit 52 can move forward in the axial direction, and the backstop key 42 abuts against the backstop ring pattern of the inner helical conduit 52 522, it can prevent the internal helical catheter 52 from being mispressed and moving forward in a straight line.

As shown in Figures 1 to 3, the threaded ring 60 can be installed axially in the pipe end 513 of the outer helical conduit 51. A threaded hole 61 is formed in the threaded ring 60, and the pitch of the threaded hole 61 is smaller than that of the helical pipe. The pitch of the guide groove 514. In this preferred embodiment, an axially extending positioning protrusion 62 is formed on the outer peripheral surface of the threaded ring 60 , which corresponds to the positioning recess 516 in the outer helical conduit 51 , so that the threaded ring 60 and the outer helical conduit 51 are combined together. .

As shown in Figures 1 to 3, the one-way ratchet 70 is installed in the one-way ratchet groove 524 of the internal helical conduit 52, and the one-way ratchet 70 includes a wheel body 71 and a plurality of wheels formed on The single oblique ratchet shrapnel 72 on the outer peripheral surface of the body 71 forms a middle hole 73 in the wheel body 71, and the shape of the middle hole 73 corresponds to the non-circular shaft hole of the screw push rod 80. The single oblique ratchet of the one-way ratchet 70 The toothed shrapnel 72 and the single oblique ratchet shrapnel 515 of the pipe end 513 of the outer helical catheter 51 are in the same oblique direction. As shown in FIG. The one-way ratchet in the one-way ratchet groove 524 of the 52 is engaged.

As shown in Figures 1 to 3, the screw push rod 80 has a dose control section 81, and the outer peripheral surface of the dose control section 81 is provided with threads, and the middle section of the screw push rod 80 forms a limit protrusion on the side edge of the dose control section 81 Edge 82, a non-circular shaft hole 83 is formed in the screw push rod 80, the screw push rod 80 is arranged in the bidirectional helical guide tube set 50, the dose control section 81 of the screw push rod 80 is screwed through the inside of the screw ring 60 , and can extend into the medicine bottle 2 and directly push against the piston 2A, or, the front end of the dose control section 81 of the screw push rod 80 can be equipped with a piston top block 84, so that the screw push rod 80 can be indirectly pushed through the piston top block 84 Arrest the piston 2A in the medicine bottle 2.

As shown in Figures 1 to 3, the injection push rod set 90 includes an injection push rod 91 and a push rod end cover 92, the injection push rod 91 includes a rod body 911 and a pressing end provided at the rear end of the rod body 911 912, the cross-sectional shape of the rod body 911 corresponds to the shape of the non-circular shaft hole 83 in the screw push rod 80 and the shape of the non-circular center hole 73 in the one-way ratchet 70. In this preferred embodiment, the non-circular center hole 73 of the rod body 911 The circular section shape is gear-shaped, polygonal, or other geometric shapes. The rod body 911 of the injection push rod 91 is axially slidable through the shaft hole 83 of the screw push rod 80, and the rod body 911 passes through the one-way ratchet 70 is fixed in the middle hole 73, wherein a positioning block 913 is formed on the rod body 911, and the one-way ratchet 70 is fixed on the rod body 911 by the positioning block 913. The rod body 911 of the injection push rod 91 has a pressing end 912 The rear end extends out of the inner helical conduit 52 . The push rod end cap 92 is sheathed outside the pressing end 912 of the injection push rod 91 .

Regarding the use of the syringe of the present invention, as shown in Figure 3 and Figure 6, when assembling the medicine bottle 2, it is in the state that the medicine bottle casing 30 is removed, and the end of the medicine bottle 2 with the piston 2A is inserted into the joint collar Positioned within 20, the piston top block 84 at the side end of the screw push rod 80 extends into the medicine bottle 2 to abut against the piston 2A, and then the medicine bottle casing 30 is set on the outside of the medicine bottle 2, and the medicine bottle casing 30 and the combined collar The combination of 20 makes the medicament bottle 2 fixed in the syringe 1. When not injecting, when the needle 3 and the needle cover 4 are not assembled on the medicine bottle casing 30 to assemble the medicine bottle 2 , first set the pen cap 5 on the outside of the medicine bottle casing 30 .

When preparing to inject, as shown in Figure 3 and Figure 7, remove the pen cap 5, install the needle 3 and the needle cover 4, insert one end of the needle 3 into the medicine bottle 2, and cover the outside of the needle 3 through the needle cover 4 to avoid using The patient was punctured by needle 3 by mistake. Secondly, quickly pull the injection push rod group 90 axially backward and straight to a predetermined position until the helical guide block 521 on the outer peripheral surface of the inner helical catheter 52 moves to the position where it contacts the limit stop edge 43 at the rear end of the inner sleeve 40 live stop. In the process of pulling back the injection push rod group 90, it simultaneously drives the inner helical catheter 52 to move backward and generates idling inside the outer helical catheter 51. Ring pattern 522 produces bounce and sound, and the backstop key 42 at the rear end of inner sleeve 40 abuts against the stop ring pattern 522 of inner helical catheter 52 to limit the position, preventing the injection push rod group 90 from being pressed by mistake. The function of driving the inner helical catheter 52 to move axially forward and linearly prevents the injection push rod set 90 from being retracted due to mispressing during the process of pulling it out backward.

When injecting, as shown in Figure 8 and Figure 9, pull out the needle cover, pierce the predetermined injection site of the human body with the needle 3, and then press the injection push rod group 90 to start injection, wherein the injection push rod group 90 is pushed straight forward action, and push the inner helical catheter 52 through the push rod end cap 92, wherein the backstop key 42 at the rear end of the inner sleeve 40 enters the axial guide groove 523 of the inner helical catheter 52, so that the inner helical catheter 52 can be connected with the injection push rod The group 90 moves straight forward together, and at the same time drives the outer helical catheter 51 to rotate forward at a fixed point through the helical guide block 521 on the outer peripheral surface of the inner helical catheter 52, until the inner helical catheter 52 completes a stroke distance on the outer helical catheter 51, and the injection pushes The rod group 90 extends into the outer casing 10 and closes. When the outer helical conduit 51 rotates in the forward direction, it also drives the screw ring 60 to rotate, and the screw push rod 80 is driven to rotate and advance through the screw ring 60 to move forward to the piston in the medicine bottle 2. 2A exerts a thrust to make the medicine in the medicine bottle 2 output through the needle 3 .

In the foregoing, through the cooperation of the helical guide groove 514 with a predetermined travel distance inside the outer helical catheter 51 and the helical guide block 521 on the outer peripheral surface of the inner helical catheter 52, and the screw connection ring 60 installed in the outer helical catheter 51 is screwed and pushed. The cooperation of the rod 80 makes the injection push rod group 90 only straightly advance the distance of the predetermined stroke at one time, and drives the screw connection ring 60 to drive the screw push rod 80 to rotate for one circle and then stop, thereby controlling the output of the medicine bottle 2. fixed injection dose. On the other hand, through the combined structure of the helical guide groove 514 of the outer helical conduit 51 and the helical guide block 521 of the inner helical conduit 52, the screw hole of the screw connection ring 60 and the screw thread of the helical push rod 80 form a small pitch stroke. Combined structure, and the large-stroke rotation thrust is converted into the injection thrust of small-stroke rotation, so that the syringe 1 has the effect of saving labor during use.

After the injection is completed, first fit the needle cap 4 on the outside of the needle 3, then pull out the needle 3 and the needle cap 4 from the syringe 1, and put the pen cap 5 on the outside of the medicine bottle casing 30 of the syringe 1 to ensure that the Once used, it can be replaced with a new needle 3 for use. When the syringe 1 is in use, the linkage mechanism invention of the injection push rod group 90 combined with the one-way ratchet wheel 70, the two-way helical guide tube group 50, the screw connection ring 60 and the helical push rod 80 makes it possible for each quantitative injection During the operation, it can be opened and closed in a cycle to facilitate the user's operation and use. In addition, the number of turns and pitch of the outer peripheral surface of the dose control section 81 of the screw push rod 80 is used to set the number of injections and the injection dose according to the volume of the medicine in the medicine bottle 2, so that the syringe 1 has the functions of fixed dose injection and automatic counting. . When the number of times of use of the syringe 1 equipped with the medicine bottle 2 reaches a predetermined number of times, the medicine in the medicine bottle 2 is just used up. At this time, the syringe 1 is discarded to avoid excessive use of the syringe 1 .

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this professional technology Personnel, without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solutions of the present invention.

Claims (6)

1. A syringe for use with a vial and a needle, the syringe comprising:

the outer protecting shell is a hollow body with openings formed at the front end and the rear end;

the joint lantern ring is assembled at the front end of the outer casing, an inner ring part is arranged in the joint lantern ring, and a unidirectional ratchet groove with a plurality of single inclined ratchets is formed in the inner ring part;

a vial housing assembled to the front end of the engagement collar for holding the vial therein, the needle being detachably assembled to the front end of the vial housing;

the inner sleeve is arranged in the outer casing, and the front end of the inner sleeve is fixed in the joint sleeve ring;

a bidirectional spiral guide pipe group which comprises an outer spiral guide pipe and an inner spiral guide pipe, wherein the outer spiral guide pipe is arranged in the inner sleeve, the external spiral conduit comprises a spiral pipe part and a pipe end formed at the front end of the spiral pipe part, the inner peripheral wall of the spiral pipe part forms a spiral guide groove, the outer peripheral surface of the pipe end forms a plurality of single inclined ratchet elastic pieces, the ratchet spring pieces are respectively abutted against the single inclined ratchets of the one-way ratchet tooth groove of the joint lantern ring, so that the outer spiral catheter can only rotate in one direction, the inner spiral conduit is arranged in the inner sleeve and the outer spiral conduit, the outer peripheral surface of the front section of the inner spiral conduit is provided with a plurality of spiral guide blocks, the spiral guide block is arranged in the spiral guide groove of the outer spiral conduit to ensure that the inner spiral conduit can rotate and advance in the outer spiral conduit, a unidirectional ratchet groove with a plurality of single inclined ratchets is formed in the rear section of the inner spiral conduit;

the screw connection ring is assembled and positioned in the pipe end of the external spiral conduit, and a screw hole is formed in the screw connection ring;

the unidirectional ratchet wheel is arranged in the unidirectional ratchet tooth groove of the inner spiral conduit and comprises a wheel body and a plurality of single-oblique ratchet elastic pieces formed on the peripheral surface of the wheel body, a middle hole is formed in the wheel body, and the single-oblique ratchet elastic pieces of the unidirectional ratchet wheel are meshed with single-oblique ratchets in the unidirectional ratchet tooth groove of the inner spiral conduit;

the spiral push rod comprises a dose control section, threads are arranged on the peripheral surface of the dose control section, a shaft hole is formed in the spiral push rod, the spiral push rod is arranged in the bidirectional spiral guide pipe group, and the dose control section of the spiral push rod is in threaded connection with the inside of the threaded connection ring and used for extending into the medicament bottle to apply thrust; and

an injection push rod group, it contains an injection push rod and a push rod end cover, the injection push rod contains a body of rod and one locates the tip of pressing of body of rod rear end, the injection push rod the body of rod pass the rigid coupling in one-way ratchet in the mesopore, just the body of rod is worn to locate with axially sliding in the screw rod in the shaft hole, the injection push rod the body of rod rear end reaches press the tip to be located outside the interior spiral pipe, push rod end cover is located the injection push rod press the tip outside, interior spiral pipe rear end pivot is located in the push rod end cover, make injection push rod group combine one-way ratchet two-way spiral guide nest of tubes the screw ring with screw rod can circulate the switching action.

2. The syringe of claim 1, wherein the rear end of the inner sleeve forms a check key and a limit stop edge, the outer peripheral surface of the rear section of the inner spiral conduit forms a plurality of check annular threads and is provided with an axial guide groove, the check key can be stopped at the check annular threads of the inner spiral conduit to prevent the inner spiral conduit from moving forward, the check key is converted to the axial guide groove to enable the inner spiral conduit to be driven to move forward, and the limit stop edge limits the position of the inner spiral conduit moving backward.

3. The injector of claim 1 or 2, wherein the axial bore of the helical ram and the stem of the injection ram are correspondingly non-circular in shape.

4. The syringe of claim 1 or 2, wherein the threaded ring has an axially extending positioning protrusion formed on an outer peripheral surface thereof, and a positioning recess formed on an inner wall of the tube end of the outer spiral conduit, and the threaded ring is positioned in the tube end of the outer spiral conduit by engagement of the corresponding positioning protrusion and positioning recess.

5. The syringe of claim 4, wherein the front and rear ends of the engagement collar are respectively an engagement ring portion and a set of engagement ring portions, the engagement ring portions are disposed and assembled in the outer casing, the engagement collar has a plurality of hooks between the inner ring portion and the engagement ring portion, and the engagement collar has an inner ring disposed between the engagement ring portion and the inner ring portion; the front end of the inner sleeve extending into the joint lantern ring is provided with a clamping groove, the clamping groove is used for clamping the clamping hook of the joint lantern ring correspondingly, the inner ring is sleeved outside the clamping hook, and the inner sleeve is fixedly connected with the joint lantern ring.

6. The syringe of claim 5 wherein the forward end of the dose control section of the helical ram houses a plunger tip.