TWI662976B - Propulsion device for syringe - Google Patents

Abstract

The utility model relates to a propulsion device for a syringe, which is arranged in a screw driving mechanism of a syringe and can be connected to a medicine cartridge. The propulsion device is arranged in a joint member by a pusher member combined with a one-way check member, and the rear end of the joint member The propelling rod is connected with an ejection member and a spring inside the front end of the propelling rod, a spiral collar is screwed on the outer side of the propelling rod, and an injecting push rod is installed in the propelling rod. The peripheral edge of the rear port of the cylinder presses the elastic buckle of the engaging member against the hook of the ejection member to be unlocked. The ejection member is driven forward by the spring, and the ejection member is used to push the ejection member forward to abut the piston in the medicine cartridge. The syringe combined with the medicine cartridge can be used directly, eliminating the emptying action of the manual operation of the ejector member of the syringe to abut the piston in the medicine cartridge, and improving the convenience of using the syringe.

Description

Propulsion device for syringe

The invention relates to a syringe, in particular to a propulsion device for a syringe. When the propulsion device is connected to a medicine cartridge filled with a medicinal solution, the push rod of the rotary driving mechanism can be automatically moved forward to contact the piston in the medicine cartridge. starting point.

In order to comply with safety regulations and enable the syringes to be reused for a limited number of times, there are two types of existing syringes: metering type syringes and metering type syringes. Among them, a known metering syringe is used to push a plunger at the rear end of a syringe after assembly of a medicine bottle, and the piston in the medicine bottle is moved by a certain travel distance through the linkage control of the internal driving mechanism, and the pre-dose is output through the needle. Pharmacy. At present, in order to achieve the purpose of labor-saving, the metering syringe uses a rotation driving mechanism combining a large-pitch stroke structure and a small-pitch stroke structure to convert the user's force of pressing the plunger of the syringe straight into a rotational force, and utilizes The rotation thrust of the large-pitch stroke is converted to the injection medicament thrust of the small-pitch stroke, which achieves the effects of quantitative injection and labor saving.

Although the aforementioned syringe can achieve the desired effects of quantitative injection and labor saving, however, after the propulsion device in the rotary driving mechanism of the syringe is connected to the drug cartridge, there is still a period between the push rod of the rotary driving mechanism and the piston in the drug cartridge. Therefore, before the human injection, the user must manually operate the rotary driving mechanism to perform an emptying action, and move the push rod of the rotary driving mechanism forward to the starting position of the piston in the contact with the drug cartridge, and then use it. Human body injection with a syringe in a medicament cartridge. The emptying operation of the manual operation rotary drive mechanism has inconveniences to the operation of the syringe, and it is necessary to improve it.

The purpose of the present invention is to provide a propulsion device for a syringe, which solves the problem of inconvenience of the operation that the user must first manually operate the rotary driving mechanism to perform the emptying operation after the syringe is combined with the drug cartridge.

In order to achieve the purpose of the previous disclosure, the propulsion device for a syringe provided by the present invention is used to be installed in a screw drive mechanism of a syringe and can be connected to a medicine cartridge. The propulsion device includes: an ejection member including a thread The pushing member and a pushing plate provided at the front end of the screw pushing member, an outer peripheral surface of the screw pushing member forms a thread portion, and the outer peripheral surface of the screw pushing member forms at least one groove; a one-way check member, Nested on the outside of the ejection member, the one-way check member includes a ring portion and at least one unidirectional ratchet elastic piece formed on the outer peripheral surface of the ring portion, an inner ring hole is formed in the ring portion, and the ring portion is formed in the ring portion and At least one flange of the hole wall of the inner ring hole, the thread pushing member of the pushing member is inserted into the inner ring hole of the ring portion, and the flange in the ring portion correspondingly extends into the groove of the thread pushing member. In the trench, the ejection member can move linearly along the front-rear axis in the one-way check member; an engaging member is installed outside the ejection member and the one-way check member, and the ejection member The push plate is located outside the front end of the engaging member. The joint base includes at least one elastic buckle formed at the rear end of the joint base. The joint base has a unidirectional ratchet ring groove with an opening facing forward and a joint plate portion at the rear end of the unidirectional ratchet ring groove. A screw hole is formed in the plate portion, and the screw pushing member of the ejecting member is screwed in the screw hole of the engaging plate portion. The tooth width of the screw hole of the engaging plate portion is smaller than that of the screw pushing member of the ejecting member. The pitch has a movable pitch. The ejection member can move linearly back and forth axially within the range of the movable pitch in the joint plate portion. The one-way check member is located in the one-way ratchet ring groove. A unidirectional ratcheting spring of the backstop member is engaged with the unidirectional ratcheting ring groove; a pushing rod is arranged at the rear end of the engaging member, the pushing rod includes a screw joint section, and the outer peripheral surface of the screw joint section An advance thread is formed. The advance thread is the same thread as the thread of the thread portion of the push-push member of the ejection member. The front end of the screwing section has a front rod end, and the advance rod has an opening toward Front front room and behind the front room A rear movable room with an opening facing rearward is provided with an abutment plate between the front movable room and the rear movable room. The push rod is provided with at least one slot hole in the end of the front rod, and the slot hole is from the front. The outer peripheral surface of the rod end is in radial communication with the front movable chamber, and the elastic buckle of the engaging member is located outside the front rod end portion of the thrust rod and corresponds to the position of the slot; a ejection member installed on the thrust rod In the front movable room, the ejection member includes a base plate portion, at least one hook, and an ejection pin. The hook and the ejection pin are formed on the front side of the base plate portion. In the slot corresponding to the rod, the position of the ejection pin corresponds to the rear end of the threaded pusher, and there is a gap between the front end of the ejection pin and the rear end of the threaded pusher; A spring is compressively installed in the front movable chamber of the push rod, and the front and rear ends of the spring respectively abut the base plate portion of the ejector and the abutment plate of the push rod; a spiral collar, the screw A screw connection hole is formed in the spiral collar on the push rod, and the screw connection of the push rod Spiro-based threaded holes provided in the collar of the spiral; and an injection plunger, which is mounted on the rear room of the push rod.

In the pushing device of the syringe as described above, the engaging member has two said snaps, and the two snaps form an equiangular distribution, and the front end of the pushing rod has two slotted holes, and the two slotted holes are respectively Corresponding to the two spring buckles, the ejection member has two hooks, and the two hooks are respectively engaged in corresponding slot holes.

In the pushing device of the syringe as described above, the engaging member forms two engaging portions at the rear end of the engaging base portion, each engaging portion forms an engaging hole, two of the engaging portions and two of the engaging portions. The elastic buckle forms a dislocation arrangement. The pushing rod is provided with two engaging projections in an end portion of the front rod. The engaging portion of the engaging member is engaged with the engaging projections of the driving rod by engaging holes.

In the pushing device of the syringe as described above, the outer circumferential surface of the screw pushing member forms two said grooves, and the two grooves are radially opposite to each other on the outer circumferential surface of the screw pushing member; the ring of the one-way check member Two said flanges are formed in the hole wall of the inner ring hole of the part, and the two flanges respectively extend into the two grooves respectively.

In the pushing device of the syringe as described above, the pushing rod has a rear rod section behind the screwing section, and the section of the rear rod section adjacent to the screwing section forms at least one elastic hook, and the rear rod of the pushing rod A segment is formed at the periphery of the elastic hook, a rear end of the elastic hook is connected to a rear rod segment, and a front end of the elastic hook is a free end.

With the invention of the propulsion device of the front-opening syringe, it is applied to the screw driving mechanism of the syringe. When the group is connected with the medicine cartridge filled with the medicinal solution, the propulsion device is provided with the ejection member and a one-way reverse The engaging member of the stopper member is inserted into the rear port of the drug cartridge with a needle. The rear port of the drug cartridge presses the buckle of the engaging member to bend inward, and the snap hook presses against the catch of the ejector to bend inward and disengage. The slot at the end of the front rod of the rod is in an unlocked state, and the elastic energy is released by the compressed spring to drive the ejection member to eject forward, and the ejection member is used to push the ejection member forward to abut the piston in the drug cartridge. The starting position enables the syringe combined with the medicine cartridge to be used directly, eliminating the need to manually push the ejector member of the syringe forward against the emptying action of the piston in the medicine cartridge, and improving the convenience of using the syringe.

In addition, the pushing device of the syringe of the present invention can further utilize the meshing structure between the one-way ratcheting elastic piece of the one-way backstop member and the one-way ratchet ring groove of the engaging member to prevent the pushing member from facing The backward movement ensures that the ejection member of the propulsion device and the piston in the medicament cylinder maintain the abutment state, and the dose of the injected medicament can be accurately controlled.

As shown in FIG. 1 to FIG. 3, it discloses a preferred embodiment of the propulsion device 1 of the syringe of the present invention. As can be seen from the drawings, the propulsion device 1 includes a pusher member 10 and a one-way check member. 20. An engaging member 30, a push rod 40, an ejection member 50, a spring 60, a spiral collar 70, and an injection push rod.

As shown in FIGS. 3 to 8, the ejection member 10 includes a threaded pushing member 11 and a pushing plate 12. The front and rear ends of the threaded pushing member 11 are a front end portion 111 and a rear end portion 112, respectively. A threaded portion 110 is formed on an outer peripheral surface of the thread pushing member 11, and at least one groove 113 extending linearly along the front-rear axis may be formed on the outer peripheral surface of the thread pushing member 11. In the preferred embodiment, the thread pushing member 11 Two grooves 113 are formed on the outer peripheral surface of the abutting member 11, and the two grooves 113 are radially opposite to each other on the outer peripheral surface of the screw pushing member 11. The pushing plate 12 is disposed at the front end portion 111 of the threaded pushing member 11, wherein a hole 121 is formed in the center of the pushing plate 12, and the front end portion 111 of the threaded pushing member 11 is inserted into the through hole 121 of the pushing plate 12. . As shown in FIG. 3, the threaded pushing member 11 and the pushing plate 12 are independent components and then combined. In addition, the threaded pushing member 11 and the pushing plate 12 may be integrally formed members (not shown). .

As shown in FIG. 3 to FIG. 8, the one-way check member 20 is sleeved on the outer side of the ejection member 10. The ejection member 10 can move linearly forward and backward axially in the one-way check member 20, and the pusher The top member 10 can rotate together with the one-way check member 20. The one-way check member 20 includes a ring portion 21 and at least one unidirectional ratchet spring piece 22. An inner ring hole 210 is formed in the ring portion. The hole wall of the hole 210 forms at least one flange 211 extending in the axial direction. In the preferred embodiment, two of the flanges 211 are formed in the hole wall of the inner ring hole 210, and the thread pushing member 11 of the ejection member 10 passes through. Provided in the inner ring hole 210 of the ring portion 21, the flange 211 of the ring portion 21 correspondingly extends into the groove 113 of the thread pushing member 11, and the one-way ratchet spring piece 22 is formed in the ring portion 21 On the outer peripheral surface, in the preferred embodiment, the one-way check member 20 forms two of the one-way ratchet spring pieces 22 on the outer peripheral surface of the ring portion. The one-way ratchet spring pieces 22 have one-way ratchet claws. 221.

As shown in FIG. 3 to FIG. 8, the engaging member 30 is installed on the outer side of the ejection member 10 and the one-way check member 20. The engaging member 30 includes an engaging base 31 and at least one elastic buckle 32. 31 has a unidirectional ratchet ring groove 311 with an opening facing forward and an engaging plate portion at the rear end of the unidirectional ratchet ring groove 311. The unidirectional ratchet ring groove 311 has a plurality of unidirectional ratchet teeth, which are engaged. A screw hole 313 is formed in the plate portion 312, and the tooth width of the screw hole 313 of the engaging plate portion 312 is smaller than the pitch of the thread pushing member 11 of the ejection member 10. The ejection plate 12 of the ejection member 10 is located at the engagement member 30. As shown in FIG. 9, the one-way check member 20 is located in the one-way ratchet ring groove 311, and the one-way ratchet spring piece 22 of the one-way check member 20 meshes with the one-way ratchet ring groove. In 311, the one-way check member 20 is rotated in the one-way direction only by the joint member 30. The thread pushing member 11 of the ejection member 10 is screwed in the screw hole 313 of the joint plate portion 312, and the joint The tooth width of the screw hole 313 of the plate portion 312 is smaller than the pitch of the screw pushing member 11 of the ejection member 10 and has a movable distance, so that the screw of the ejection member 10 The pushing member 11 can move linearly back and forth axially within the range of the movable distance in the engaging plate portion 312. The elastic buckle 32 is formed on the rear end of the engaging base 31 and projects rearwardly. The elastic buckle 32 has Bending elasticity. In this preferred embodiment, the joint member 30 has two of the spring buckles 32, and the two spring buckles 32 are arranged in an equiangular distribution. The engaging member 30 further forms two engaging portions 33 at the rear end of the engaging base portion 31. Each engaging portion 33 forms an engaging hole 331. The two engaging portions 33 and the two elastic buckles 32. A misalignment is formed.

As shown in FIG. 3 to FIG. 8, the push rod 40 is arranged at the rear end of the joint member 30. The push rod 40 includes a screw connection section 41, a front rod end 42 and a rear rod section 43. A screw thread is formed on the outer peripheral surface of the screw connection segment 41. The screw thread of the screw connection segment 41 is the same as the screw thread of the screw portion 110 of the screw pushing member 11 of the ejection member 10. The front rod end portion 42 is located at In front of the screw connection section 41, the rear rod section 43 is located behind the screw connection section 41. The front end of the push rod 40 has a front movable chamber 44 with an opening facing forward, and the push rod 40 is provided with an opening behind the front movable chamber 44. There is an abutment plate 46 between the rear activity room 45, the front activity room 44 and the rear activity room 45.

As shown in FIG. 3 to FIG. 8, in the present preferred embodiment, the abutting plate 46 of the pushing rod 40 is located inside the screw joint section 41 near the front end portion of the front rod end portion 42, and the front movable chamber 44 self-propelled the rod. The front end of 40 extends to the front end portion of the screw connection section 41 through the front rod end portion 42. The pushing rod 40 is provided with at least one slot hole 421 in the front rod end portion 42. The slot hole 421 communicates with the front movable chamber 44 radially from the outer peripheral surface of the front rod end portion. In the preferred embodiment, the front rod end portion 42 is provided with two said slot holes 421, and two engaging projections 422 are provided on the outer peripheral surface of the front rod end portion 42. The pushing rod 40 is a front rod end portion 42 which is connected to the rear end of the engaging member 30, wherein The engaging portion 33 of the engaging member 30 is engaged with the engaging hole 331 and the engaging projection 422 of the front rod end portion 42 of the pushing rod 40. The spring buckles 32 of the engaging member 30 respectively correspond to the slot holes of the pushing rod 40. 421 outside.

As shown in FIG. 3 to FIG. 8, in the present preferred embodiment, the rear movable chamber 45 extends from the screw joint section 41 to the rear end of the push rod 40 through the rear rod section 43, and the rear rod of the push rod 40 The section 43 adjacent to the screwing section 41 forms at least one elastic hook 47. The rear rod section 43 of the push rod 40 forms a through groove 48 around the elastic hook 47, and the elastic hook 47 The end is connected to the rear rod segment 43. The front end of the elastic hook 47 is a free end and has elasticity in bending.

As shown in FIG. 3 to FIG. 8, the ejection member 50 is installed in the front movable chamber 44 of the pushing rod 40. The ejection member 50 includes a base plate portion 51, at least one hook 52, and an ejection pin 53. The hook 52 and the ejection top post 53 are formed on the front side of the base plate portion 51 and protrude forward. In the preferred embodiment, the ejection member 50 has two hooks 52 in the initial state. Next, the hook 52 is correspondingly locked in the slot 421 of the pushing lever 40, so that the ejection member 50 is locked in the pushing lever 40, the ejection top post 53 is located in the center of the base plate portion 51, and the The position of the ejection jack 53 corresponds to the rear end portion 112 of the threaded pusher 11. In the initial state, there is a gap between the front end of the ejection jack 53 and the rear end 112 of the threaded pusher 11. . In this preferred embodiment, a positioning flange 54 may be formed on the rear side of the substrate portion 51 so as to protrude rearward.

As shown in FIG. 3 to FIG. 8, the spring 60 is installed in the front movable chamber 44 of the pushing rod 40. The front and rear ends of the spring 60 abut against the rear side of the substrate portion 51 of the ejection member 50 and the When the abutment plate 46 of the push rod 40 is set in the initial state of the pusher 40 in the front movable chamber 44 of the push rod 40, the spring 60 is in a compressed state and accumulates elastic energy. In this preferred embodiment, In the middle, the front end of the spring 60 is sleeved on the outer side of the positioning flange 54 on the rear side of the base plate portion 51 of the ejector 50 to limit the position.

As shown in FIG. 3 to FIG. 4 and FIG. 7 to FIG. 8, the spiral collar 70 is screwed on the pushing rod 40. A screw connection hole 71 is formed in the spiral collar 70. The connecting hole 71 is screwed outside the screwing section 41 of the pushing rod 40.

As shown in FIG. 3 to FIG. 4 and FIG. 7 to FIG. 8, the injection pusher 80 is installed in the rear movable chamber 45 of the push rod 40, and the front end of the injection push rod 80 faces the abutting plate of the push rod 40. 46.

As shown in FIG. 10 to FIG. 13, when the propulsion device 1 of the present invention is applied to a syringe, the propulsion device 1 is provided in a rotary driving mechanism of the syringe. The rotation driving mechanism includes a spiral catheter, a spiral sleeve, and a spiral advancement rod. The rotation driving mechanism may be a rotary drive mechanism of a known syringe. The composition structure of the spiral catheter, spiral sleeve, and spiral advancement rod is not the invention. Part, will not repeat them here. It should be noted that the spiral catheter set in the rotary driving mechanism is set in the spiral sleeve, and the spiral thrust rod is screwed in the spiral sleeve and the spiral conduit, and has the function of using a large pitch stroke to move. The invention advances One set of the device is set in a rotary driving mechanism. The spiral collar 70 is set in a spiral catheter, and can be driven to rotate at a fixed point. The spiral collar 70 and the push rod 40 have a screw connection structure with a small pitch stroke. It can use the large-pitch and long-pitch rotary thrust to convert to the small-pitch stroke of the injected pharmaceutical thrust. The injection pusher 80 of the propulsion device 1 extends from the rear end of the rotary drive mechanism and is connected to a pusher end cap. The pusher end cap is used to provide pressing The location.

As shown in FIG. 11 to FIG. 13, the propulsion device 1 of the present invention is applied to a syringe. When a medicine cartridge 2 filled with a medicinal solution is assembled, the ejection member 10 and the one-way check member 20 are assembled. The engaging member 30 of the medical device 2 is fitted with the rear port 2B of the drug cartridge 2 having a needle. The hook 52 is bent inward and separated from the slot hole 421 of the front rod end 42 of the push rod 40, and is in an unlocked state, that is, the spring 60 that is originally compressed and accumulates elastic energy provides elastic force, so that the ejection member 50 is acted by the elastic force. The ejection member 50 is ejected forward, and the ejection member 10 is used to push the ejection member 10 forward until the push plate 12 at the front end of the ejection member 10 abuts the piston 2A in the medicine cartridge 2, so that the user can immediately use the The syringe is used for human body injection, eliminating the need for manually operating the rotary drive mechanism of the syringe to drive the ejection member forward against the emptying action of the piston in the medicament cartridge, thereby improving the convenience of using the syringe.

When a user uses a syringe for human injection, the injection method of the syringe is almost the same as that of the existing syringes. Among them, the spiral collar 70 and the push rod 40 are screwed with a small pitch stroke to make the syringe The rotary drive mechanism of the invention uses a labor-saving rotary pitch with a large pitch to convert the thrust to drive the propelling lever 40 to generate a thrust of a straight injection with a small pitch stroke, and pushes the propelling lever by pushing the engaging member 30 and the ejecting member 10 forward. The medicinal solution in the squeezed medicine cartridge 2 is injected into the human body through a needle, wherein a forward-moving push rod 40 provides a forward thrust to the ejection member 10 via an engaging member 30, and a threaded pushing member 11 of the ejection member The ejection member 50 also receives a thrust force at the rear end of the thread pushing member 11 by the elastic force of the spring 60, and the ejection member 10 uses the one-way ratchet spring piece 22 of the one-way check member 20 and the one-way ratchet of the engaging member 30. The meshing structure between the ring gear grooves 311 can prevent the ejection member 10 from moving backwards and backwards, and ensure that the ejection member 10 of the propulsion device and the piston 2A in the medicine cartridge 2 maintain abutted states, and can be accurately controlled. Injected dose of medicament.

According to the foregoing description, it can be known that the propulsion device of the present invention can be applied to a screw drive mechanism of a syringe. When the medicine container filled with a medicinal solution is connected to the propulsion device, the propulsion device is provided with the ejection member and the one-way check member. The engaging member of the drug cartridge is inserted into the rear port of the drug cartridge with a needle, and the latch of the engaging member is bent inward by the peripheral edge of the drug cartridge, and the latch of the ejector is bent inward to disengage the push rod. The slot at the end of the front rod is in an unlocked state, and then the compressed spring releases the elastic energy, drives the ejection member to eject forward, and pushes the ejection member forward, until the push plate at the front of the ejection member pushes into the medicine barrel. The piston moves forward a predetermined distance, and the piston moves forward to push the liquid medicine in the medicine barrel to reduce the space. The air at the front of the medicine barrel is automatically forced out through the needle, so that the medicine barrel is completely in the state of the medicine liquid. After the syringe is combined with the medicine cartridge, there is no need to manually operate the syringe to perform the air emptying action in the medicine cartridge, thereby improving the convenience of using the syringe.

Furthermore, the pushing device of the syringe of the present invention utilizes a meshing structure between the unidirectional ratcheting elastic piece of the unidirectional backstop member and the unidirectional ratchet ring groove of the joint member to prevent the pushback member from being reversed backward. The movement ensures that the ejection member of the propulsion device and the piston in the medicament cylinder maintain a state of abutment, and the dose of the injected medicament can be accurately controlled.

1‧‧‧ propulsion device

2‧‧‧ Pharmacy Cartridge

2A‧‧‧Piston

2B‧‧‧ rear port

10‧‧‧ ejector

11‧‧‧ Thread Pusher

110‧‧‧Thread

111‧‧‧ front end

112‧‧‧back end

113‧‧‧Slot

12‧‧‧ Pusher

121‧‧‧ perforation

20‧‧‧ one-way backstop

21‧‧‧Ring

210‧‧‧Inner ring hole

211‧‧‧ flange

22‧‧‧One-way ratchet spring

221‧‧‧One-way ratchet

30‧‧‧Joint members

31‧‧‧Joint base

311‧‧‧One-way ratchet ring groove

312‧‧‧Joint plate

313‧‧‧Thread hole

32‧‧‧ spring buckle

33‧‧‧ Engagement Department

331‧‧‧ engagement hole

40‧‧‧thruster

41‧‧‧Screw joint

42‧‧‧ front rod end

421‧‧‧Slot

422‧‧‧ Engagement bump

43‧‧‧ rear pole

44‧‧‧ Former Activity Room

45‧‧‧ post-activity room

46‧‧‧Abutment board

47‧‧‧Elastic buckle

48‧‧‧ trough

50‧‧‧ ejector

51‧‧‧Substrate Department

52‧‧‧ card hook

53‧‧‧ ejection pillar

54‧‧‧ positioning flange

60‧‧‧Spring

70‧‧‧ spiral collar

71‧‧‧Screw hole

80‧‧‧ Injection putter

FIG. 1 is a schematic perspective view of a preferred embodiment of a propulsion device for a syringe of the present invention. FIG. 2 is a schematic perspective view of another viewing angle of the preferred embodiment of the pushing device of the syringe shown in FIG. 1. FIG. 3 is an exploded perspective view of a preferred embodiment of the pushing device of the syringe shown in FIG. 1. FIG. 4 is a schematic perspective sectional view of a preferred embodiment of a pushing device of the syringe shown in FIG. 1. FIG. 5 is a schematic exploded perspective view of some components in the preferred embodiment of the pushing device of the syringe shown in FIGS. 1 to 3. FIG. 6 is a schematic view of another viewing angle of FIG. 5. FIG. 7 is a schematic side sectional view of a preferred embodiment of the propulsion device of the syringe shown in FIG. 1. FIG. FIG. 8 is a partially enlarged schematic diagram of FIG. 7. Fig. 9 is a sectional view of the end of the cutting plane line A-A shown in Fig. 8. FIG. 10 is a schematic perspective view of a preferred embodiment of the pushing device of the syringe shown in FIG. 1 assembled with a medicine bottle. FIG. 11 is a schematic diagram (1) of assembling a medicine bottle in the preferred embodiment of the pushing device of the syringe shown in FIG. 1. FIG. FIG. 12 is an operation schematic diagram (2) of assembling a medicine bottle in the preferred embodiment of the pushing device of the syringe shown in FIG. 1. FIG. FIG. 13 is a schematic diagram of the operation of assembling a medicine bottle (3) in the preferred embodiment of the pushing device of the syringe shown in FIG. 1.

Claims (5)

The utility model relates to a pushing device of a syringe, which is arranged in a screw driving mechanism of a syringe and can be connected to a medicine cartridge. The pushing device comprises: a pushing member, which comprises a screw pushing member and a screw pushing member arranged on the screw. A push plate at the front end of the piece, the thread pushing part forming an outer peripheral surface of the thread, the thread pushing part forming at least one groove on the outer peripheral surface; a one-way check member, which is sleeved on the outer side of the pushing member, The one-way check member includes a ring portion and at least one unidirectional ratchet elastic piece formed on an outer peripheral surface of the ring portion, an inner ring hole is formed in the ring portion, and at least one protrusion formed on a hole wall of the inner ring hole. Edge, the thread pushing member of the pushing member penetrates the inner ring hole of the ring portion, and the flange in the ring portion correspondingly extends into the groove of the screw pushing member, and the pushing member can The one-way check member moves linearly along the front-rear axis; an engagement member is installed outside the ejection member and the one-way check member, and the push plate of the ejection member is located outside the front end of the engagement member , The joining member includes a joining base and is formed on the At least one elastic buckle at the rear end of the base, the joint base has a unidirectional ratchet ring groove with an opening facing forward, and a joint plate portion at the rear end of the unidirectional ratchet ring groove, a screw hole is formed in the joint plate portion, The thread pushing member of the ejection member is screwed in the screw hole of the joint plate portion, and the tooth width of the screw hole of the joint plate portion is smaller than the pitch of the thread pushing member of the ejection member and has a movable distance. The ejection member can move linearly back and forth axially within the range of the movable distance in the joint plate portion, the one-way check member is located in the one-way ratchet ring groove, and the one-way ratchet of the one-way check member A toothed elastic sheet is engaged with the one-way ratchet ring groove; a pushing rod is arranged at the rear end of the engaging member, the pushing rod includes a screw joint section, and an outer peripheral surface of the screw joint section forms a pushing thread, the pushing The screw thread is the same screw thread as that of the screw part of the screw pushing member of the ejection member. The front end of the screw connection section has a front rod end portion. The push rod has a front movable chamber with an opening facing forward and is located at the front. A rear activity room with an opening behind the front activity room, the front There is an abutment plate between the moving room and the rear moving room. The pushing rod is provided with at least one slot in the front rod end portion, and the slot hole is in radial communication with the front activity from the outer peripheral surface of the front rod end portion. A spring of the engaging member is located outside the front end of the push rod and corresponds to the position of the slot; a ejector is installed in the front movable chamber of the push rod, and the ejector includes a base plate Part, at least one hook and an ejection top post, the hook and the ejection top post are formed on the front side of the substrate part, and the hook is set in a slot corresponding to the pushing rod, and the ejection The position of the top post corresponds to the rear end of the screw pushing member, and there is a gap between the front end of the ejection top post and the rear end of the screw pushing member; a spring is compressively installed on the The front and rear ends of the push rod, the front and rear ends of the spring respectively abut the base plate portion of the ejector and the abutment plate of the push rod; a spiral collar, which is screwed on the push rod, in the spiral collar A screw connection hole is formed, and the screw connection section of the pushing rod is screwed in the screw connection hole of the spiral collar. ; And an injection plunger, which is mounted on the rear room of the push rod. The propulsion device for a syringe according to claim 1, wherein the engaging member has two spring buckles, and the two spring buckles form an equiangular distribution, and the front rod end of the push rod has two slotted holes, two The slotted holes respectively correspond to the two snap buckles, and the ejection member has two hooks, and the two hooks are respectively latched in corresponding slotted holes. The pushing device for a syringe according to claim 2, wherein the engaging member forms two engaging portions at the rear end of the engaging base, and each engaging portion forms an engaging hole, and the two engaging portions and The two spring buckles form a misaligned arrangement. The front end of the push rod is provided with two engaging projections. The engaging portion of the engaging member is engaged with the engaging projections of the push rod by engaging holes. . The propulsion device for a syringe according to claim 3, wherein the outer circumferential surface of the screw pushing member forms two of the grooves, and the two grooves are radially opposite to each other on the outer circumferential surface of the screw pushing member; the one-way reverse Two said flanges are formed in the inner ring hole wall of the ring portion of the stop member, and the two flanges respectively extend into the two grooves. The propulsion device for a syringe according to any one of claims 1 to 4, wherein the propulsion rod has a rear rod section behind the screw connection section, and the rear rod section forms at least one section adjacent to the screw connection section. An elastic hook, a rear rod section of the pushing rod forms a through groove at the periphery of the elastic hook, a rear end of the elastic hook is connected to the rear rod section, and a front end of the elastic hook is a free end.