TWI541043B - The screw guide mechanism of the syringe - Google Patents

Description

Spiral guide mechanism for syringe

This creation is about a syringe, especially the spiral guide mechanism of the syringe.

At present, the syringe products of the prior art are divided into two types: a meter type syringe and a counting type syringe, in order to meet the purpose of quantitative injection, counting the number of injections, and limited re-use of the syringe. Wherein, in the composition of the metered syringe product, a pusher is mainly connected to a driving mechanism composed of a plurality of driving components in a syringe casing, thereby installing a medicine bottle in the syringe casing at the front end of the syringe casing. A needle is arranged, and the needle is connected to the medicine bottle. When the needle is injected, the needle penetrates into a predetermined part of the human body, and after pressing the rear end of the push rod, the push rod is controlled by the driving part driving the driving mechanism, thereby pushing the piston in the medicine bottle to move. The stroke is used to output a predetermined dose of the medicament through the needle.

The composition of the metered syringe disclosed in the prior art can be combined with the pharmaceutical bottle to achieve the purpose of quantitative injection of the medicament. However, during the operation of the syringe, the syringe is limited by the mutual interlocking between the driving components in the driving mechanism of the syringe, which causes the syringe to have troublesome operation when injecting the medicament, which is inconvenient for the user to operate.

The main purpose of this creation is to provide a screw guiding mechanism for a syringe, and to create a problem of improving the operation of the existing metering syringe.

In order to achieve the pre-existing purpose, the spiral guiding mechanism of the syringe proposed by the present invention includes: a bidirectional spiral guiding tube set comprising an outer spiral conduit and an inner spiral conduit, the outer spiral conduit comprising a spiral tube portion and a tube end formed at the front end of the spiral tube portion, the inner peripheral wall of the spiral tube portion forming a spiral guide a groove, the inner spiral conduit is disposed in the outer spiral conduit, and the outer circumferential surface of the inner spiral conduit is provided with a plurality of spiral guide blocks, and the spiral guide block is inserted into the spiral guide groove of the outer spiral conduit, so that the inner spiral conduit can The outer spiral conduit rotates for a predetermined stroke distance, and a unidirectional ratchet groove having a plurality of single oblique ratchet teeth is formed inside the rear portion of the inner spiral conduit; a screw ring is set in the tube end of the outer spiral conduit, a threaded hole is formed in the threaded ring; a one-way ratchet is mounted in the one-way ratchet groove of the inner spiral conduit, the one-way ratchet includes a wheel body and a plurality of single oblique ratchets formed on the outer circumference of the wheel body a spring piece, a middle hole is formed in the wheel body, the single oblique ratchet spring piece meshes with a single oblique ratchet tooth in the one-way ratchet groove; and a screw push rod includes a dose control section at a dose The outer circumference of the control section is threaded. a shaft hole is formed in the rotary push rod, and the screw push rod is installed in the bidirectional spiral guide tube group, and the dose control portion of the screw push rod is screwed through the inside of the screw ring, and is inserted into the medicine bottle to be applied And an injection pusher set comprising an injection pusher and a pusher end cover, the injection pusher comprising a rod body and a pressing end portion disposed at the rear end of the rod body, the rod of the injection push rod passing through The rod body is fixed in the hole of the one-way ratchet, and the rod body is axially slidably disposed in the shaft hole of the screw push rod, and the rear end and the pressing end portion of the rod of the injection push rod are located outside the inner spiral duct, and the push rod The end cap is sleeved on the outer side of the pressing end of the injection pusher, the rear end of the inner spiral conduit is pivoted in the push rod end cover, and the injection pusher set is combined with the one-way ratchet, the bidirectional spiral guiding tube set, the screw ring and the screw push The rod can be cycled open and closed.

Created by the aforementioned spiral guiding mechanism, when it is applied to a syringe, the spiral guiding mechanism mainly adopts a large pitch stroke combined structure of a bidirectional spiral guiding tube group, and is matched with a small pitch stroke between the screw ring and the screw push rod. The combined structure converts the direct pressing force of the pressing injection pusher group into a rotating force, and converts the injection thrust to the small stroke rotation through the large stroke rotary thrust, thereby achieving the effect of quantitatively injecting the medicament in a simple and labor-saving manner.

1‧‧‧Syringe

2‧‧‧Pharmaceutical bottles

2A‧‧‧Piston

3‧‧‧ needle

4‧‧‧ needle cover

5‧‧‧ pen cover

10‧‧‧ outer casing

11‧‧‧Binding end

20‧‧‧ Engagement collar

21‧‧‧Joint ring

210‧‧‧ card ring groove

211‧‧‧Shaped sheet

212‧‧‧Clamping bumps

22‧‧‧Group of Rings

23‧‧‧ Inner Ring Department

24‧‧‧ one-way ratchet groove

25‧‧‧ hook

26‧‧‧ Inner ring

260‧‧‧Shaped inner gasket

27‧‧‧Non-circular through holes

271‧‧‧Limited side

30‧‧‧Pill bottle cover

40‧‧‧Inner casing

41‧‧‧ card slot

42‧‧‧Check button

43‧‧‧Limited retaining edge

50‧‧‧Two-way spiral guiding tube set

51‧‧‧External spiral catheter

511‧‧‧Spiral Department

512‧‧‧ ring end wall

513‧‧‧ tube end

514‧‧‧Spiral guide

515‧‧‧ ratchet shrapnel

516‧‧‧ positioning recess

52‧‧‧Inside spiral catheter

521‧‧‧Spiral guide block

522‧‧‧Check the ring pattern

523‧‧‧Axis guide slot

524‧‧‧One-way ratchet groove

525‧‧‧ pivotal

60‧‧‧ screw ring

61‧‧‧ screw holes

62‧‧‧ positioning convex

70‧‧‧One-way ratchet

71‧‧‧ wheel body

72‧‧‧Single oblique ratchet

73‧‧‧Medium hole

80‧‧‧Auger

81‧‧‧Dose control section

82‧‧‧Limited flange

83‧‧‧Axis hole

84‧‧‧Piston top block

85‧‧‧ positioning edge

86‧‧‧Flange

90‧‧‧Injection putter group

91‧‧‧Injection putter

911‧‧‧ rod body

912‧‧‧ Pressing the end

913‧‧‧ Positioning stop

92‧‧‧Pushing end cap

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective exploded view of a preferred embodiment of a helical guiding mechanism of the present inventive syringe.

2 is a perspective exploded view showing another viewing angle of the preferred embodiment of the screw guiding mechanism shown in FIG. 1.

3 is a perspective exploded view of the preferred embodiment of the screw guiding mechanism of FIGS. 1 and 2 further including a coupling collar.

4 is a schematic cross-sectional view showing a preferred embodiment of the spiral guiding mechanism shown in FIGS. 1 to 3.

Fig. 5 is a schematic cross-sectional view showing the position A-A of the cut surface line shown in Fig. 4.

Figure 6 is a cross-sectional view showing the end of the cut line position B-B shown in Figure 4.

Fig. 7 is a perspective exploded view showing another preferred embodiment of the engaging collar of the spiral guiding mechanism of the present invention and a two-arc inner shim and an inner sleeve.

FIG. 8 is a perspective view showing the joint collar of FIG. 7 combined with the two-arc inner gasket assembly inner sleeve.

Figure 9 is a perspective exploded view of another preferred embodiment of the injection pusher set, the one-way ratchet, and the auger pusher in the helical guide mechanism of the present inventive syringe.

Figure 10 is a perspective exploded view of the preferred embodiment of the screw guiding mechanism shown in Figures 1 and 2 applied to a syringe and a needle and a needle cover.

Figure 11 is a perspective exploded view of another embodiment of the preferred embodiment of the helical guide mechanism of Figure 10 and a portion of the syringe.

Figure 12 is a schematic cross-sectional view showing the syringe of Figure 10 with the needle and needle attached thereto.

Fig. 13 is a schematic cross-sectional view showing the syringe of Fig. 10 without a needle and a needle cover and a cover.

Figure 14 is a schematic cross-sectional view showing the cut line position C-C shown in Figure 13.

Figure 15 is a schematic cross-sectional view showing the end face position D-D of Figure 13;

Fig. 16 is a schematic cross-sectional view showing the syringe of Fig. 10 with the needle cover removed and the pusher of the pusher to start the injection.

Figure 17 is a schematic cross-sectional view showing the syringe of Figure 10 when the pusher is injected with the dosing agent.

As shown in FIG. 1 and FIG. 2, a preferred embodiment of the spiral guiding mechanism of the present invention is disclosed. The spiral guiding mechanism comprises a bidirectional spiral guiding tube set 50, a screwing ring 60, and a screw guiding mechanism. A one-way ratchet 70, a screw pusher 80, and an injection pusher set 90.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , the bidirectional spiral guiding tube set 50 includes an outer spiral conduit 51 and an inner spiral conduit 52 . The outer spiral conduit 51 includes a screw portion 511 . A front end wall 512 and a tube end 513 projecting forwardly from the end wall 512 are formed at the front end of the tube portion 511. The inner peripheral wall of the screw portion 511 forms a spiral guide groove 514, and the outer peripheral surface of the tube end 513 forms a plurality of single oblique lines. To the ratcheting piece 515, the inner end of the tube end 513 is further provided with an axially extending positioning recess 516.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , in the two-way spiral guiding tube set 50 , the inner spiral duct 52 is installed in the outer spiral duct 51 , and the outer peripheral surface of the front section of the inner spiral duct 52 is provided. A plurality of spiral guide blocks 521 are inserted into the spiral guide grooves 514 of the outer spiral conduit 51 by the spiral guide blocks 521, and the inner spiral conduits 52 can be coupled to the outer spiral conduits 51 by the cooperation of the spiral guide blocks 521 and the spiral guide grooves 514. The inner spiral conduit 52 forms a one-way ratchet groove 524 having a plurality of single oblique ratchet teeth. The rear end of the inner spiral conduit 52 forms a pivoting portion 525, and the inner spiral conduit 52 is formed. The pivoting portion 525 can extend beyond the rear end of the inner sleeve 40. In the preferred embodiment, the outer peripheral surface of the inner section of the inner spiral conduit 52 further forms a plurality of check loops 522, and is provided with a predetermined length of the guide groove 523.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , the threaded ring 60 is mounted in the tube end 513 of the outer spiral conduit 51 . The threaded ring 60 defines a screw hole 61 , and the pitch of the screw hole 61 is smaller than that. The pitch of the spiral guide groove 514 of the outer spiral conduit 51. In the preferred embodiment, the outer peripheral surface of the threaded ring 60 forms an axis. The extending positioning projection 62 is fitted to the positioning recess 516 in the outer spiral conduit 51 so that the threaded ring 60 is coupled to the outer spiral conduit 51.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , the one-way ratchet 70 is mounted in a one-way ratchet groove 524 of the inner spiral conduit 52 . The one-way ratchet 70 includes a wheel body 71 and a plurality of shapes. A single oblique ratchet piece 72 is formed on the outer peripheral surface of the wheel body 71. A middle hole 73 is formed in the wheel body 71. The cross-sectional shape of the middle hole 73 corresponds to the non-circular shaft hole of the screw push rod 80, and the single-direction ratchet wheel 70 is single. The oblique ratchet spring 72 engages with the one-way ratchet of the one-way ratchet groove 524 in the inner helical tube 52.

As shown in FIG. 1, FIG. 2 and FIG. 4, the auger 80 has a dose control section 81, and a thread is arranged on the outer peripheral surface of the dose control section 81, and a middle section of the screw pusher 80 is formed on the side edge of the dose control section 81. The limiting flange 82 forms a non-circular shaft hole 83 in the screw push rod 80. The screw push rod 80 is disposed in the bidirectional spiral guiding tube set 50, and the dose control section 81 of the screw push rod 80 is screwed through the screw The inside of the ring 60 can be inserted into a medicament bottle to push against the piston, or a piston top block 84 is disposed at the front end of the dose control section 81 of the screw pusher 80, and the piston top block 84 is pushed against the medicament bottle. The piston inside.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , the injection pusher 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 rod body 911 . The pressing end portion 912 of the rear end, 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 non-circular middle hole 73 in the one-way ratchet 70, and the injection push rod 91 has its rod body. The 911 is axially slidably disposed through the shaft hole 83 of the screw push rod 80, and the rod body 911 is fixed through the hole 73 in the one-way ratchet 70, wherein a positioning block 913 is formed on the rod body 911. The one-way ratchet 70 is fixed to the rod body 911 by a positioning block 913. The rod body 911 of the injection push rod 91 has a pressing end portion 912 and a rear end protrudes out of the inner spiral duct 52. The push rod end cover 92 is sleeved. The pivoting portion of the rear end of the inner spiral conduit 52 is pivotally disposed in the push rod end cover 92 outside the pressing end portion 912 of the injection pusher 91.

The non-circular shape of the hole 73 of the one-way ratchet 70, the shaft hole 83 of the screw push rod 80 and the rod body 911 of the injection push rod 91 may be a gear shape (as shown in FIG. 2) or a polygon, etc. It has a straight side shape (as shown in FIG. 9) and the like on one side or diametrically opposite sides.

As shown in FIG. 3 and FIG. 4, the screw guiding mechanism further includes an engaging collar 20, and the engaging collar 20 includes an engaging ring portion 21, a set of connecting ring portions 22, and an inner ring portion 23. The assembly ring portion 22 and the engagement ring portion 21 are respectively located at the front end and the rear end of the engagement collar 20, and the inner ring portion 23 is located inside the engagement collar 20, and the inner ring portion 23 is formed with a plurality of single oblique directions. One-way ratchet groove 24 of the ratchet. The engaging collar 20 is further provided with a plurality of hooks 25 between the inner ring portion 23 and the engaging ring portion 21, and the tube end 513 of the outer spiral conduit 51 extends into the inner ring portion 23 of the engaging collar 20, The ratchet spring 515 of the outer peripheral surface of the outer end of the outer spiral conduit 51 abuts against the single oblique ratchet of the one-way ratchet groove 24 of the engaging collar 20, so that the outer spiral conduit 51 can only rotate in one direction. The auger 80 is threaded through the engagement collar 20 and is only linearly movable in the axial direction. In the preferred embodiment, a non-circular through hole 27 having a limiting edge 271 is formed in the engaging collar 20, and the outer peripheral shape of the cross section of the auger 80 corresponds to the shape of the non-circular through hole 27. And having a positioning edge 85 corresponding to the limiting edge 271, the auger 80 is inserted into the engagement collar 20 and can only move linearly in the axial direction.

As shown in FIG. 3 and FIG. 4, in the preferred embodiment, the engaging ring portion 21 of the engaging collar 26 is a full-circular annular body, and an inner ring ring 26 can be coupled to the inner side of the engaging ring portion 21. A snap ring groove 210 is formed on the outer peripheral surface of the joint ring portion 21 on the outer side of the hook 25. In another preferred embodiment, as shown in FIG. 7 and FIG. 8 , the engaging ring portion 21 of the engaging collar 26 forms a two-radially symmetric curved body 211 on which the two curved shaped bodies 211 are formed. Each of the arc-shaped inner spacers 260 is disposed on the outer side of the hooks 25 for assembling an inner sleeve 40, and at least one latching protrusion 212 is formed on the outer peripheral surface of the two curved sheet bodies 211 for An outer casing is snap-fitted.

When the spiral guiding mechanism of the present invention is applied to a syringe, the syringe 1 shown in FIG. 10 and FIG. 11 is taken as an example. In addition to the screw guiding mechanism, the syringe 1 further includes an outer casing 10 and a The vial casing 30, an inner sleeve 40 and a cover 5 for use in conjunction with the vial 2 with the needle 3 and the needle cover 4 are used.

Please refer to FIG. 10 and FIG. 11 , wherein the engaging collar 20 is disposed inside the outer casing 10 , and the vial casing 30 is detachably assembled to the engaging collar 20 . The front end, as shown in FIG. 10 and FIG. 12, is used for fixing a medicine bottle 2, wherein a front end of the medicine bottle casing 30 is provided with a set of needles 3, and the inner sleeve 40 is installed on the outer guard. Inside the casing 10, the front end of the inner sleeve 40 is assembled to engage the collar 20, and is engaged in the slot 41 of the front end of the inner sleeve 40 by the hook 25 in the engaging collar 20, the engaging collar 26 An inner ring ring 26 (or a two-arc block) is sleeved on the outer side of the hook 25 to fix the inner sleeve 40 and the joint collar 20, and the outer casing 10 is sleeved on the outer side of the joint collar 20, The rear end of the inner sleeve 40 extends out of the outer casing 10, and the bidirectional spiral guiding tube set 50 is installed in the inner sleeve 40. The rear end of the spiral conduit 52 in the bidirectional spiral guiding tube set 50 extends. Outside the rear end of the inner sleeve 40, the rear end of the inner sleeve 40 has a check button 42 that can be displaced between the check ring 522 and the shaft guide groove 523 of the rear portion of the inner spiral conduit 52. Wherein, as shown in FIG. 15, when the check button 42 protrudes into the shaft guiding groove 523, the inner spiral duct 52 can move forward in the axial direction, and when the check button 42 abuts against the back ring of the inner spiral duct 52 When the rib 522 is formed, the inner spiral conduit 52 can be prevented from being inadvertently moved linearly toward the front axial direction. The rear end of the inner sleeve 40 also has a limit retaining edge 43 for limiting the position of the inner spiral conduit 52 to move backward.

As shown in FIG. 10 to FIG. 11, the threaded ring 60 is mounted in the tube end 513 of the outer spiral conduit 51. The positioning of the screw ring 60 with the outer circumferential surface of the positioning projection 62 and the outer spiral conduit 51 is shown. The recess 516 is mated so that the threaded ring 60 is coupled to the outer spiral conduit 51. The tube end 513 of the outer spiral conduit 51 also extends into the engagement collar 20. As shown in FIG. 14, the outer spiral conduit 51 abuts the one-way spine in the engagement collar 20 with its ratcheting elastic piece 515, respectively. The single helical groove of the slot 24 allows the outer helical conduit 51 to rotate only in one direction. The one-way ratchet 70 is mounted in the one-way ratchet groove 524 of the inner spiral conduit 52. As shown in FIG. 15, the one-way ratchet 70 has a single oblique ratchet on the outer circumferential surface of the wheel body 71. The tab 72 engages the one-way ratchet of the one-way ratchet groove 524 in the rear portion of the inner helical conduit 52.

As shown in FIG. 10, FIG. 11 and FIG. 13, the auger 80 is mounted in the inner spiral conduit 51 of the bidirectional spiral guiding tube set 50, and the auger 80 has a threaded dose control section 81. Through the threaded screw ring 60, a front end of the dose control section 81 of the screw pusher 80 is provided with a piston top block 84, and the screw push rod 80 is pushed against the piston 2A in the vial 2 via the piston top block 84. The injection push rod 91 of the injection pusher set 90 can be axially slidably disposed in the shaft hole 83 of the screw push rod 80 and disposed in the one-way ratchet 70, the injection push rod The one-way ratchet 70 is fixed by a positioning stopper 913 on the rod body thereof. The injection push rod 91 has a rear end of the pressing end portion 912 protruding out of the inner spiral duct 52, and the push rod end cover 92 is sleeved. Outside the pressing end portion 912 of the injection pusher 91, the pivoting portion at the rear end of the inner spiral conduit 52 is pivotally disposed in the push rod end cover 92 to constitute a syringe 1.

In the case of using the syringe 1 having the screw guiding mechanism, as shown in FIG. 13, when the medicine bottle 2 is assembled, the medicine bottle 2 has one end of the piston 2A in a state where the medicine bottle casing 30 is detached. Positioned into the engagement collar 20, the piston top block 84 at the side end of the screw push rod 80 extends into the medicament bottle 2 to abut the piston 2A, and then the vial sleeve 30 is sleeved on the outside of the medicament bottle 2, by the vial sleeve The combination of the 30 and the binding collar 20 secures the vial 2 to the syringe 1. As shown in FIG. 13, when the needle 3 and the needle cover 4 are not assembled on the vial casing 30, the medicine bottle 2 is assembled, and the pen cover 5 can be first set on the vial case. 30 outside.

When preparing for injection, as shown in FIGS. 12 and 13, the pen cover 5 is removed, and the needle 3 and the needle cover 4 are attached. One end of the needle 3 is inserted into the drug bottle 2, and the needle cover 4 is covered on the outside of the needle 3 to avoid The user is mistakenly stabbed by the needle 3. Next, the injection pusher set 90 is quickly pulled straight back to the predetermined position in the axial direction until the spiral guide block 521 of the outer peripheral surface of the inner spiral conduit 52 is moved to contact the inner end of the inner sleeve 40 at the limit retaining edge 43. Stay stopped. As shown in FIG. 12, during the pulling process of the injection pusher group 90, the inner spiral conduit 52 is driven to move backward and the inner spiral conduit 51 is idly rotated, and the check button 42 at the rear end of the inner sleeve 40 can be The back of the inner spiral conduit 52 is bouncing to generate a sound, and the stop button 42 at the rear end of the inner sleeve 40 abuts against the limit of the inner loop conduit 52 to prevent the ring 522 from being restrained. Injection putter The group 90 is depressed to drive the linear motion of the inner spiral conduit 52 toward the front axial direction, so that the injection pusher set 90 is not retracted and retracted during the backward pulling process.

As shown in Fig. 16 and Fig. 17, during the injection process, the needle cover 4 is removed, the needle 3 is inserted into the predetermined injection site of the human body, and the injection pusher group 90 is pressed to start the injection, wherein the injection is pushed by pressing straight forward. The action of the rod set 90 pushes the inner spiral conduit 52 via the push rod end cap 92, wherein the check button 42 at the rear end of the inner sleeve 40 enters the axial guide groove 523 of the inner spiral conduit 52, so that the inner spiral conduit 52 The straight forward movement of the outer spiral conduit 51 can be driven by the spiral guide block 521 of the outer peripheral surface of the inner spiral conduit 52 until the inner spiral conduit 52 completes the travel of the outer spiral conduit 51. At a stroke distance, the injection pusher set 90 extends into the outer casing 10 to close. When the outer spiral conduit 51 rotates in the forward direction, the screw ring 60 is rotated together, and the screw push rod 80 is rotationally driven to rotate forward through the screw ring 60 to apply a thrust to the piston 2A in the drug bottle 2, so that the drug bottle 2 is rotated. The medicine inside is output through the needle 3.

As shown in FIGS. 16 and 17, in the above, the spiral guide groove 514 having a predetermined stroke distance inside the outer spiral conduit 51 is engaged with the spiral guide block 521 of the outer peripheral surface of the inner spiral conduit 52, and is attached to the outer spiral. The screwing ring 60 of the conduit 51 is screwed to the engagement of the screw push rod 80, so that the pressing injection pusher group 90 can only directly push the distance of the predetermined stroke at a time, and drives the screw ring 60 to drive the screw push rod 80 to rotate synchronously. The lap is stopped, and the drug bottle 2 is controlled to output the set injection dose. On the other hand, by the combination of the helical guide groove 514 of the outer spiral conduit 51 and the large pitch stroke of the spiral guide block 521 of the inner spiral conduit 52, the screw hole of the screw ring 60 and the thread of the screw push rod 80 are small pitches. The stroke combination structure, and the injection thrust of the large stroke rotary thrust to the small stroke rotation, makes the syringe 1 have a labor-saving effect during use.

As shown in FIG. 12, after the injection is completed, the needle cover 4 is first sleeved on the outer side of the needle 3, and then the needle 3 and the needle cover 4 are pulled out together from the syringe 1, and the pen cover 5 is closed to the vial cover of the syringe 1. The outside of the shell 30 ensures that the next needle can be replaced with a new needle.

As shown in FIG. 16 and FIG. 17, the syringe 1 is combined with the one-way ratchet 70, the bidirectional spiral guiding tube set 50, the screwing ring 60 and the auger 80 by the injection pusher set 90 during use. The linkage mechanism creates a labor-saving operation mode that can convert the large-stroke rotary thrust into a small-stroke rotation of the injection thrust during each quantitative injection operation, and is combined with the cycle opening and closing mode for the user to operate. In addition, the number of threads and the pitch of the outer peripheral surface of the dose control section 81 of the screw pusher 80 are used to set the number of injections and the injection dose according to the dosage of the medicine in the vial 2, so that the syringe 1 is provided with fixed dose injection and automatic counting. Features. When the number of uses of the syringe 1 containing the drug bottle 2 reaches a predetermined number of times, the medicine in the drug bottle 2 is just used up. At this time, the syringe 1 is discarded to prevent the syringe 1 from being overused.

50‧‧‧Two-way spiral guiding tube set

51‧‧‧External spiral catheter

511‧‧‧Spiral Department

512‧‧‧ ring end wall

513‧‧‧ tube end

514‧‧‧Spiral guide

515‧‧‧ ratchet shrapnel

52‧‧‧Inside spiral catheter

521‧‧‧Spiral guide block

525‧‧‧ pivotal

60‧‧‧ screw ring

61‧‧‧ screw holes

70‧‧‧One-way ratchet

71‧‧‧ wheel body

72‧‧‧Single oblique ratchet

73‧‧‧Medium hole

80‧‧‧Auger

81‧‧‧Dose control section

82‧‧‧Limited flange

83‧‧‧Axis hole

84‧‧‧Piston top block

85‧‧‧ positioning edge

90‧‧‧Injection putter group

91‧‧‧Injection putter

911‧‧‧ rod body

912‧‧‧ Pressing the end

913‧‧‧ Positioning stop

92‧‧‧Pushing end cap

Claims (10)

A spiral guiding mechanism for a syringe comprises: a bidirectional spiral guiding tube set comprising an outer spiral conduit and an inner spiral conduit, the outer spiral conduit comprising a screw portion and a front end formed on the screw portion a spiral guide groove is formed in the inner peripheral wall of the spiral tube portion, the inner spiral conduit is installed in the outer spiral conduit, and a plurality of spiral guide blocks are arranged on the outer peripheral surface of the front portion of the inner spiral conduit, and the spiral guide block is placed in the outer spiral conduit The spiral guide groove enables the inner spiral conduit to rotate in the outer spiral conduit for a predetermined stroke distance, and a unidirectional ratchet groove having a plurality of single oblique ratchet teeth is formed inside the rear portion of the inner spiral conduit; Set in the tube end of the outer spiral conduit, a screw hole is formed in the threaded ring; a one-way ratchet is installed in the one-way ratchet groove of the inner spiral conduit, the one-way ratchet includes a wheel body and a plurality of forming a single oblique ratchet spring on the outer peripheral surface of the wheel, a middle hole is formed in the wheel body, and the single oblique ratchet spring meshes with the single oblique ratchet in the one-way ratchet groove; Rod, which contains a dose control In the segment, a thread is arranged on the outer peripheral surface of the dose control section, a shaft hole is formed in the screw push rod, and the screw push rod is installed in the bidirectional spiral guide tube group, and the dose control section of the screw push rod is screwed through the inside of the screw ring. And for applying a pushing force into a medicine bottle; and an injection pusher group comprising an injection push rod and a push rod end cover, the injection push rod comprising a rod body and a pressing force disposed at the rear end of the rod body At the end, the rod of the injection push rod passes through the hole fixed in the one-way ratchet, and the rod body can be axially slidably disposed in the shaft hole of the screw push rod, and the rear end of the rod of the injection push rod and The pressing end is located outside the inner spiral conduit, the push rod end cover is sleeved outside the pressing end of the injection push rod, the rear end of the inner spiral conduit is pivotally disposed in the push rod end cover, and the injection push rod group is combined with the one-way ratchet and the bidirectional spiral The guiding tube set, the screw ring and the screw push rod can circulate. The screw guiding mechanism of the syringe according to claim 1, wherein the shaft hole of the screw push rod and the shape of the rod of the injection push rod are non-circular. The spiral guiding mechanism of the syringe according to claim 1, wherein the outer peripheral surface of the screw ring forms an axially extending positioning convex portion, and the inner wall of the outer end of the outer spiral conduit forms a positioning concave portion. The combination of the corresponding positioning protrusion and the positioning recess allows the threaded ring to be positioned within the tube end of the outer spiral conduit. The screw guiding mechanism of the syringe according to claim 2, wherein the outer peripheral surface of the screw ring forms an axially extending positioning convex portion, and the inner wall of the outer end of the outer spiral conduit forms a positioning concave portion. The combination of the corresponding positioning protrusion and the positioning recess allows the threaded ring to be positioned within the tube end of the outer spiral conduit. The screw guiding mechanism of the syringe according to claim 4, wherein a tip end of the dose control section of the screw pusher is provided with a piston top block. The spiral guiding mechanism of the syringe according to any one of claims 1 to 5, wherein the outer peripheral surface of the outer end of the outer spiral conduit forms a plurality of single oblique ratcheting elastic pieces, and the helical guiding mechanism further comprises a An engagement collar having an inner ring portion, an engagement ring portion and an inner ring disposed between the engagement ring portion and the inner ring portion, wherein the inner ring portion defines a plurality of single oblique spines The one-way ratchet groove of the tooth, the ratchet spring of the outer spiral catheter tube end abuts against the single oblique ratchet of the one-way ratchet groove of the engaging collar. The screw guiding mechanism of the syringe according to claim 6, wherein a non-circular through hole having a limiting edge is formed in the engaging collar, and a peripheral shape of the outer surface of the auger is corresponding to a non-circular opening. The shape of the hole has a positioning edge corresponding to the limit edge, and the screw push rod is disposed in the joint collar and can only move linearly along the axial direction. The screw guiding mechanism of the syringe according to claim 7, wherein the engaging collar is provided with a plurality of hooks between the inner ring portion and the engaging ring portion. The screw guiding mechanism of the syringe according to claim 8, wherein the engaging ring portion of the engaging collar is a full-circular annular body, and an inner ring is sleeved on the inner side of the engaging ring portion outside the hook. The screw guiding mechanism of the syringe according to claim 8, wherein the engaging ring portion of the engaging collar forms two arc-shaped plates arranged symmetrically, and each of the two curved pieces is provided with an arc shape. The inner gasket is sleeved on the outer side of the hook, and at least one snap protrusion is formed on the outer peripheral surface of the two curved sheets.