WO2020047841A1 - 注射器的推进装置 - Google Patents

注射器的推进装置 Download PDF

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Publication number
WO2020047841A1
WO2020047841A1 PCT/CN2018/104607 CN2018104607W WO2020047841A1 WO 2020047841 A1 WO2020047841 A1 WO 2020047841A1 CN 2018104607 W CN2018104607 W CN 2018104607W WO 2020047841 A1 WO2020047841 A1 WO 2020047841A1
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WO
WIPO (PCT)
Prior art keywords
rod
engaging
pushing
ejection
hole
Prior art date
Application number
PCT/CN2018/104607
Other languages
English (en)
French (fr)
Inventor
叶进民
帕蒂尔⋅沙特亚修翰
Original Assignee
群康生技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 群康生技股份有限公司 filed Critical 群康生技股份有限公司
Priority to PCT/CN2018/104607 priority Critical patent/WO2020047841A1/zh
Priority to EP18932964.2A priority patent/EP3848074B1/en
Priority to US16/965,999 priority patent/US11839748B2/en
Priority to JP2020535643A priority patent/JP6962623B2/ja
Publication of WO2020047841A1 publication Critical patent/WO2020047841A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M5/31515—Connection of piston with piston rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31525—Dosing
    • A61M5/31528—Dosing by means of rotational movements, e.g. screw-thread mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
    • A61M5/31578—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31521—Pistons with a forward extending skirt at their front end

Definitions

  • the invention relates to a syringe, in particular to a propulsion device for a syringe.
  • the propulsion device When the propulsion device is connected to a medicine cartridge filled with a medicinal solution, the pusher of the rotary driving mechanism can be automatically moved forward to contact a piston in the medicine cartridge The starting position.
  • metering type syringes 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.
  • 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 then the needle is output in advance. Dose of medicament.
  • the metering syringe uses a combination of a large-pitch stroke structure and a small-pitch stroke structure to rotate the driving force of a user's direct push of the syringe's push rod into a rotational force.
  • the rotary thrust of the pitch stroke is converted to the injection medicament thrust of the small pitch stroke, which achieves the effects of quantitative injection and labor saving.
  • 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 a period between the push rod of the rotary driving mechanism and the piston in the drug cartridge. The distance, therefore, the user must manually operate the rotary drive mechanism to perform an emptying action before human injection, so that the push rod of the rotary drive mechanism moves forward to the starting position of the piston in the contact with the drug cartridge, and then can be used. Human body injection with a syringe in a medicament cartridge. The emptying operation of the manually operated rotary driving mechanism has inconveniences to the operation of the syringe, and it is necessary to improve it.
  • the technical problem to be solved by 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 medicine cartridge.
  • the technical solution provided by the present invention is to provide 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 includes:
  • An ejection member includes a screw pushing member and a pushing plate provided at a front end of the screw pushing member, an outer peripheral surface of the screw pushing member forms a threaded portion, and an outer peripheral surface of the screw pushing member forms at least A groove
  • a one-way check member is sleeved on the outer side 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, and the hole wall of the inner ring hole forms at least one flange.
  • the thread pushing member of the ejection member passes through the inner ring hole of the ring portion, and the flange in the ring portion extends correspondingly. In the groove of the thread pushing member, the pushing member can move linearly in the axial direction in the one-way check member;
  • An engaging member is installed on the outer side of the ejection member and the one-way check member.
  • the ejection plate of the ejecting member is located outside the front end of the engaging member.
  • the engaging member includes an engaging base and is formed on the engaging base. At least one elastic buckle at the rear end, the engagement 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, and the pusher
  • the screw pushing member of the top member is screwed in the screw hole of the engaging plate portion, and the tooth width of the screw hole of the engaging plate portion is smaller than the pitch of the screw pushing member of the pushing member to form a movable distance.
  • the member can move linearly along the axial direction of the joint plate portion within the range of the movable distance.
  • the one-way check member is located in the one-way ratchet ring groove.
  • the one-way ratchet spring of the one-way check member engages. In the unidirectional ratchet ring groove;
  • An advancing rod is arranged at the rear end of the engaging member.
  • the advancing rod includes a screw connection section, and an outer peripheral surface of the screw connection section forms an advancing thread, and the advancing thread is pushed against a thread of the ejecting member.
  • the thread of the threaded portion is the same rotation thread.
  • the front end of the screwed section has a front rod end.
  • the push rod has a front movable chamber with an opening forward and a rear opening with a rearward opening.
  • An activity room the abutment plate is provided between the front activity room and the rear activity room, and the push rod is provided with at least one slot hole in the front rod end portion, and the slot hole is from the outer peripheral surface of the front rod end portion
  • the front movable chamber is communicated radially, and the elastic buckle of the engaging member is located outside the front rod end of the pushing rod and corresponds to the position of the slot hole;
  • An ejection member is installed in the front movable room of the push rod.
  • 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 base plate portion.
  • the hook is correspondingly latched in the slot of the pushing rod, the ejection pin position corresponds to the rear end of the threaded pusher, and the front end of the ejection pin and the threaded pusher There is a gap between the rear ends;
  • a spring compressively installed in the front movable chamber of the pushing rod, the front and rear ends of the spring respectively abutting the base plate portion of the ejector and the abutting plate of the pushing rod;
  • a spiral collar which is screwed on the thrust rod, a screw connection hole is formed in the spiral collar, and a screw connection section of the thrust rod is screwed in the screw connection hole of the spiral collar;
  • An injection push rod is installed in the rear movable chamber of the push rod.
  • the engaging member has two said snaps, and the two snaps form an equiangular distribution, and the front rod end of the pushing rod has two said slot holes and two said slots.
  • the holes respectively correspond to the two spring buckles, and the ejection member has two of the hooks, and the two hooks are respectively engaged in the corresponding slot holes.
  • the engaging member forms two engaging portions at a rear end of the engaging base, each of the engaging portions forms an engaging hole, and the two engaging portions and two
  • the elastic buckles form an offset arrangement
  • the push rod is provided with two engaging projections in an end portion of the front rod, and the engaging portion of the engaging member is engaged with the engaging projection of the push rod through the engaging hole.
  • the outer circumferential surface of the thread pushing member forms two of the grooves, and the two grooves are radially opposite to each other on the outer circumferential surface of the thread pushing member;
  • the one-way backstop Two of the flanges are formed in the hole wall of the inner ring hole of the ring portion of the component, and the two flanges respectively extend into the two grooves correspondingly.
  • the pushing rod has a rear rod section behind the screwing section, and a section of the rear rod section adjacent to the screwing section forms at least one elastic buckle.
  • a rod section forms a through groove on 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.
  • the beneficial effect achieved by the present invention is that the propulsion device of the front-opening syringe is applied to the screw drive mechanism of the syringe.
  • the propulsion device When its assembly is connected with a drug cartridge filled with a medicinal solution, the propulsion device is provided with the ejection member and The coupling member of the one-way check member is inserted into the rear port of the drug cartridge with a needle, and the spring member of the drug cartridge is pressed in by the peripheral edge of the rear port of the drug cartridge to bend inward, and the snap hook pressed against the ejector is bent inward to disengage.
  • the slot at the end of the front rod of the push 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 the abutment of 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.
  • the pushing device of the syringe of the present invention can further utilize the meshing structure between the unidirectional ratcheting elastic piece of the unidirectional backstop member and the unidirectional ratchet ring groove of the engaging member by the pushing member, so as to prevent the pushing member Backward and backward movements ensure that the ejection member of the propulsion device maintains abutment with the piston in the medicament cartridge, and the dose of medicament injected can be accurately controlled.
  • FIG. 1 is a schematic perspective view of a preferred embodiment of a syringe propulsion device 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 propulsion device of the syringe shown in FIG. 1.
  • FIG. 4 is a schematic perspective sectional view of a preferred embodiment of the propulsion device of the syringe shown in FIG. 1.
  • FIG. 5 is an exploded perspective view of some components in a preferred embodiment of the propulsion 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 cross-sectional side view of a preferred embodiment of the propulsion device of the syringe shown in FIG. 1.
  • 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 medicine bottle assembled in a preferred embodiment of the pushing device of the syringe shown in FIG. 1.
  • 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. 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. 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.
  • the propulsion device 1 includes a pusher member 10 and a one-way check member. 20.
  • 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.
  • the thread pushing 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 push plate 12 is disposed at the front end portion 111 of the screw pushing member 11, wherein a hole 121 is formed in the center of the push plate 12, and the front end portion 111 of the screw pushing member 11 is inserted into the through hole 121 of the push plate 12. .
  • the threaded pushing member 11 and the pushing plate 12 are independent components and then combined.
  • the threaded pushing member 11 and the pushing plate 12 may be integrally formed members (not shown). .
  • 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 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 ring 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.
  • 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
  • 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.
  • 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 312 at the rear end of the unidirectional ratchet ring groove 311.
  • the unidirectional ratchet ring groove 311 has a plurality of unidirectional oblique ratchet teeth.
  • a screw hole 313 is formed in the engaging plate portion 312. 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 on the engagement member. Outside the front end of 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 is engaged with the one-way ratchet ring. In the groove 311, the one-way check member 20 is rotated in the reverse direction only within 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 passes through the hole.
  • 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 and has a movable distance, so that the ejection member 10
  • the thread pushing member 11 can move linearly along the front-rear axial direction of the engaging plate portion 312 within the range of the movable distance.
  • the elastic buckle 32 is formed at the rear end of the engaging base 31 and protrudes rearward. 32 has bending elasticity.
  • the joint member 30 has two of the spring buckles 32, and the two spring buckles 32 are arranged in an equiangular distribution, that is, the two spring buckles 32 are along the radial direction of the coupling member 30. Relative settings.
  • 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.
  • 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.
  • An advancing thread is formed on the outer peripheral surface of the connecting section 41.
  • the advancing thread of the screwing section 41 is the same as the thread of the threading portion 110 of the thread 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 lever section 43 is located behind the screw connection section 41.
  • the front end of the push rod 40 has a front movable chamber 44 which is opened forward.
  • the push rod 40 is provided behind the front movable chamber 44.
  • the abutment plate 46 of the pushing rod 40 is located at the front end portion of the screwing section 41 adjacent to the front rod end portion 42, and the front movable chamber 44 is pushed from the pushing rod 40.
  • the front end of the front end extends to the front end of the screw connection section 41 through the front rod end portion 42.
  • the push rod 40 is provided with at least one slot hole 421 in the front rod end portion 42, and the slot hole 421 communicates with the front movable chamber 44 radially from the outer peripheral surface of the front rod end portion.
  • 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 front rod end portion 42 of the push rod 40 is assembled with 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, and the buckles 32 of the engaging member 30 correspond to the slot holes of the pushing rod 40, respectively. 421 outside.
  • the rear movable chamber 45 extends from the screw connection section 41 through the rear lever section 43 to the rear end of the push rod 40, and the rear lever section 43 of the push rod 40
  • the section adjacent to the screwing section 41 forms at least one elastic hook 47.
  • the rear rod section 43 of the pushing rod 40 forms a through slot 48 on the periphery of the elastic hook 47, and the rear end of the elastic hook 47 Connected to the rear rod section 43, the front end of the elastic buckle 47 is a free end and has a curved elasticity.
  • 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 toward the front.
  • the ejection member 50 has two hooks 52 in the initial state.
  • 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.
  • a positioning flange 54 may be formed on the rear side of the substrate portion 51 and project rearwardly.
  • 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 base plate portion 51 of the ejection member 50 and the pushing.
  • the spring 60 is in a compressed state and accumulates elastic energy.
  • the front end of the spring 60 is sleeved on the outer side of the positioning flange 54 on the rear side of the substrate portion 51 of the ejector 50 to limit the position.
  • the spiral collar 70 is screwed on the pushing rod 40.
  • a screw connection hole 71 is formed in the spiral collar 70.
  • the connection hole 71 is screwed outside the screw connection section 41 of the pushing rod 40.
  • 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 46 of the push rod 40. .
  • the propulsion device 1 of the present invention 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 as an example.
  • the 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 constituent structure of the spiral catheter, spiral sleeve, and spiral advancement rod is not a creative part of the present invention. , I will not repeat them here.
  • the spiral catheter set in the rotary driving mechanism is set in the spiral sleeve
  • 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.
  • One set of the propulsion device is set in the rotation driving mechanism.
  • the set of spiral collars 70 is set in the spiral duct and can be driven to rotate at a fixed point.
  • the spiral collar 70 and the propelling rod 40 have a screw connection structure with a small pitch stroke. It can make use of the large-pitch and long-pitch rotary thrust to convert to the small-pitch stroke of the injection medicament 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 place to press.
  • the propulsion device 1 of the present invention is applied to a syringe.
  • the propulsion device 1 is provided with the ejection member 10 and a one-way check.
  • the engaging member 30 of the member 20 is inserted into the rear port 2B of the drug cartridge 2 having a needle, and the elastic member 32 of the engaging member 30 is pressed by the peripheral edge of the rear port 2B of the drug cartridge 2 to bend inward, and the elastic member 32 is pressed against the ejection member 50.
  • the hook 52 is bent inward and separated from the slot 421 of the front rod end 42 of the push rod 40, and is in an unlocked state, that is, the spring 60 that was originally compressed to accumulate elastic energy provides elastic force, so that the ejection member 50 is directed toward Ejecting in front, and using the ejection member 50 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 cylinder 2, so that the user can immediately use the syringe combined with the medicine cylinder 2 Performing human body injection, eliminating the need to manually operate the rotary drive mechanism of the syringe to drive the ejector member forward against the emptying action of the piston in the medicament cartridge, thereby improving the convenience of using the syringe.
  • the injection method of the syringe is almost the same as that of the existing syringes, and the syringe is configured with a small pitch stroke between the spiral collar 70 and the pushing rod 40 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 of a small pitch stroke, and pushes the propelling lever 30 and the propelling member 10 forward to push
  • the medicinal solution in the medicine cartridge 2 is injected into the human body through a needle, wherein the forward-moving push rod 40 provides a forward thrust to the ejection member 10 via the engaging member 30, and the threaded pushing member 11 of the ejection member also
  • the ejection member 50 receiving the elastic force of the spring 60 provides thrust at the rear end of the thread pushing member 11, and the ejection member 10 passes the unidirectional ratchet spring piece 22 of the uni
  • the meshing structure between the ring grooves 311 can prevent the ejection member 10 from moving backwards and backwards, ensuring that the ejection member 10 of the propulsion device and the piston 2A in the drug cartridge 2 maintain an abutment state, and can accurately control Preparation of the dose of medicament for injection.
  • the propulsion device of the present invention can be applied to a screw drive mechanism of a syringe.
  • the propulsion device When a medicine cartridge 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 buckle of the engaging member is pressed in by the peripheral edge of the rear port of the drug cartridge to bend inward.
  • the slot at the end is in an unlocked state, and the elastic energy is released by the compressed spring, which 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 against the piston in the cartridge.
  • Move a predetermined distance forward use the piston to move forward to push the liquid medicine in the medicine barrel to shrink the space, automatically force the air at the front of the medicine barrel to be completely discharged through the needle, so that the medicine barrel is completely in the state of the medicine liquid, and the syringe is combined with the medicine After the cartridge, there is no need to manually operate the syringe to perform the air emptying action in the drug cartridge, thereby improving the convenience of using the syringe.
  • the pushing device of the syringe of the present invention utilizes the engaging structure of the ejection member combined with the unidirectional ratcheting elastic piece of the unidirectional backstop member and the unidirectional ratchet ring groove of the engaging member to prevent the ejection member from facing backwards.
  • the reverse movement ensures that the ejection member of the propulsion device and the piston in the medicament can maintain abutted state, and the dose of the injected medicament can be accurately controlled.

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
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Abstract

一种注射器的推进装置(1)，其用以装设于注射器的螺旋驱动机构中，并能连接药剂筒(2)，推进装置(1)以推顶构件(10)结合单向逆止构件(20)组设于接合构件(30)中，接合构件(30)的后端连接推进杆(40)，推进杆(40)的前端内部设置弹射件(50)与弹簧(60)，推进杆(40)的外侧螺设螺旋套环(70)，且推进杆(40)中装设注射推杆(80)，推进装置(1)以接合构件(30)装入药剂筒(2)的后端口(2B)，通过药剂筒(2)的后端口(2B)周缘压迫接合构件(30)的弹扣(32)压抵弹射件(50)的卡勾(52)而呈解锁状态，通过弹簧(60)驱动弹射件(50)朝前弹射，并利用弹射件(50)推动推顶构件(10)向前运动至抵接药剂筒(2)中的活塞(2A)，使结合药剂筒(2)的注射器即能直接使用，免除手动操作注射器的推顶构件(10)向前抵接药剂筒(2)内的活塞(2A)的排空动作，增进注射器使用的方便性。

Description

注射器的推进装置 技术领域
本发明涉及一种注射器，尤指一种注射器的推进装置，该推进装置与装填有药液的药剂筒连接时，能够使旋转驱动机构件的推杆自动往前运动至接触药剂筒内的活塞的起始位置。
背景技术
为了符合安全的规范，使注射器与能够有限次数的重复使用，现有的注射器有计量型注射器与计次型注射器两种型式。其中，已知计量型注射器于组装药剂瓶后，其利用按压注射器后端的推杆动作，通过内部的驱动机构的连动控制来推动药剂瓶内的活塞移动一定行程距离，进而通过针头输出预出剂量的药剂。目前计量型注射器为了进一步达到操作省力的目的，该注射器即利用大螺距行程构造与小螺距行程构造组合的旋转驱动机构，将用户直向按压注射器的推杆的力量转变为旋转力量，并利用大螺距行程的旋转推力转换至小螺距行程的注射药剂推力，达到定量注射和省力的功效。
前述注射器虽能达到预期的定量注射和省力等功效，然而，该注射器的旋转驱动机构中的推进装置连接药剂筒后，因为旋转驱动机构的推杆相对于药剂筒内的活塞之间还有一段间距，因此，使用者于进行人体注射前，必须手动操作旋转驱动机构执行排空动作，使旋转驱动机构件的推杆往前运动至接触药剂筒内的活塞的起始位置，之后，才能使用结合药剂筒的注射器进行人体注射。此手动操作旋转驱动机构的排空动作，对于注射器的操作有其不便之处，实有加以改善的必要。
发明内容
本发明所要解决的技术问题是：提供一种注射器的推进装置，解决注射器结合药剂筒后，须由使用者先行手动操作旋转驱动机构执行排空动作的操作不便问题。
本发明所提出的技术解决方案是：提供一种注射器的推进装置，其用以装设于一注射器的螺旋驱动机构中，并能连接一药剂筒，该推进装置包括：
一推顶构件，其包括一螺纹推抵件与设于该螺纹推抵件前端的一推板，该螺纹推抵件的外周面形成一螺纹部，且该螺纹推抵件的外周面形成至少一槽沟；
一单向逆止构件，其套设于该推顶构件的外侧，该单向逆止构件包括一环部以及形成于该环部的外周面的至少一单向棘齿弹片，该环部中形成一内环孔，该内环孔的孔壁形成至少一凸缘，该推顶构件的螺纹推抵件穿设于该环部的内环孔中，该环部中的凸缘对应伸入该螺纹推抵件的槽沟中，该推顶构件能于该单向逆止构件中沿着轴向直线运动；
一接合构件，其装设于该推顶构件与该单向逆止构件的外侧，该推顶构件的推板位于该接合构件的前端外侧，该接合构件包括一接合基部以及形成于该接合基部后端的至少一弹扣，该接合基部具有一开口朝前的单向棘齿环槽以及位于该单向棘齿环槽后端的一接合板部，该接合板部中形成一螺孔，该推顶构件的螺纹推抵件螺设于该接合板部的螺孔中，该接合板部的螺孔的齿宽小于该推顶构件的螺纹推抵件的螺距而形成一活动间距，该推顶构件能于所述活动间距的范围内沿该接合板部的轴向直线运动，该单向逆止构件位于该单向棘齿环槽中，该单向逆止构件的单向棘齿弹片啮合于该单向棘齿环槽；
一推进杆，其组设于该接合构件的后端，该推进杆包括一螺接段，该螺接段的外周面形成一推进螺纹，所述推进螺纹与该推顶构件的螺纹推抵件的螺纹部的螺纹为相同旋向螺纹，该螺接段的前端具有一前杆端部，该推进杆具有一开口朝前的前活动室以及位于该前活动室后方的一开口朝后的后活动室，该前活动室与该后活动室之间具有一抵靠板，该推进杆于该前杆端部中设有至少一槽孔，所述槽孔自该前杆端部的外周面径向连通该前活动室，该接合构件的弹扣位于该推进杆的前杆端部的外侧且对应于所述槽孔的位置；
一弹射件，其装设于该推进杆的前活动室内，该弹射件包括一基板部、至少一卡勾以及一弹射顶柱，所述卡勾与所述弹射顶柱形成于该基板部的前侧，所述卡勾对应卡设于该推进杆的槽孔中，所述弹射顶柱位置对应于该螺纹推抵件的后端部，且所述弹射顶柱的前端与螺纹推抵件的后端部之间具有一间距；
一弹簧，其能压缩地装设于该推进杆的前活动室内，该弹簧的前后两端分别抵接该弹射件的基板部与该推进杆的抵靠板；
一螺旋套环，其螺设于该推进杆上，该螺旋套环中形成一螺接孔，该推进杆的螺接段螺设于该螺旋套环的螺接孔中；以及
一注射推杆，其装设于该推进杆的后活动室中。
如上所述的注射器的推进装置中，该接合构件具有两所述弹扣，两所述弹扣形成等角度分布排列，该推进杆的前杆端部具有两所述槽孔，两所述槽孔分别对应于两所述弹 扣，该弹射件具有两所述卡勾，两所述卡勾分别卡接于相对应的所述槽孔中。
如上所述的注射器的推进装置中，该接合构件于该接合基部的后端形成两个卡合部，每一所述卡合部中形成一卡合孔，两个所述卡合部与两个所述弹扣形成错位排列，该推进杆于所述前杆端部中设有两卡合凸块，该接合构件的卡合部通过所述卡合孔与该推进杆的卡合凸块卡接组合。
如上所述的注射器的推进装置中，该螺纹推抵件的外周面形成两所述槽沟，两所述槽沟于所述螺纹推抵件的外周面径向相对设置；该单向逆止构件的环部的内环孔的孔壁中形成两所述凸缘，两所述凸缘分别对应伸入两述槽沟中。
如上所述的注射器的推进装置中，该推进杆于该螺接段的后方具有一后杆段，该后杆段邻近该螺接段的区段形成至少一弹性扣勾，该推进杆的后杆段于所述弹性扣勾的周边形成一穿槽，所述弹性扣勾的后端连接所述后杆段，所述弹性扣勾的前端为自由端。
本发明可达成的有益功效是，通过前揭注射器的推进装置应用于注射器的螺旋驱动机构中，当其组接装填有药液的药剂筒时，该推进装置以组设有该推顶构件与单向逆止构件的接合构件装入具有针头的药剂筒的后端口，通过药剂筒的后端口周缘压迫接合构件的弹扣朝内弯曲，通过弹扣压抵弹射件的卡勾向内弯曲而脱离推进杆的前杆端部的槽孔，呈解锁状态，进而通过被压缩的弹簧释放弹性能驱动弹射件朝前方弹射，且利用弹射件推动推顶构件向前运动至抵接药剂筒中的活塞的起始位置，使结合药剂筒的注射器即能直接使用，免除手动操作注射器的推顶构件向前抵接药剂筒内的活塞的排空动作，增进注射器使用的方便性。
此外，本发明的注射器的推进装置还能进一步利用推顶构件结合单向逆止构件的单向棘齿弹片与接合构件的单向棘齿环槽之间的啮合构造，而能阻止推顶构件朝后逆向运动，确保推进装置的推顶构件与药剂筒内的活塞维持抵接的状态，而能精确控制注射的药剂剂量。
附图说明
下面结合附图对本发明的具体实施方式作进一步详细的说明。
图1是本发明的注射器的推进装置的一优选实施例的立体外观示意图。
图2是图1所示注射器的推进装置优选实施例另一观视角度的立体示意图。
图3是图1所示注射器的推进装置优选实施例的立体分解示意图。
图4是图1所示注射器的推进装置优选实施例的立体剖面示意图。
图5是图1至图3所示注射器的推进装置优选实施例中的部分部件的立体分解示意图。
图6是图5的另一观视角度的示意图。
图7是图1所示注射器的推进装置优选实施例的侧视剖面示意图。
图8是图7的局部放大示意图。
图9是图8所示割面线A-A位置端视断面图。
图10是图1所示注射器的推进装置优选实施例组接药剂瓶的立体示意图。
图11是图1所示注射器的推进装置优选实施例组接药剂瓶的操作示意图(一)。
图12是图1所示注射器的推进装置优选实施例组接药剂瓶的操作示意图(二)。
图13是图1所示注射器的推进装置优选实施例组接药剂瓶的操作示意图(三)。
附图标号说明：
1推进装置
2药剂筒           2A活塞
2B后端口
10推顶构件        11螺纹推抵件
110螺纹部         111前端部
112后端部         113槽沟
12推板         121穿孔
20单向逆止构件    21环部
210内环孔         211凸缘
22单向棘齿弹片    221单向棘齿爪
30接合构件        31接合基部
311单向棘齿环槽   312接合板部
313螺孔           32弹扣
33卡合部          331卡合孔
40推进杆          41螺接段
42前杆端部        421槽孔
422卡合凸块       43后杆段
44前活动室        45后活动室
46抵靠板          47弹性扣勾
48穿槽
50弹射件      51基板部
52卡勾     53弹射顶柱
54定位凸缘
60弹簧
70螺旋套环    71螺接孔
80注射推杆
具体实施方式
以下配合图式及本发明的优选实施例，进一步阐述本发明为达成预定发明目的所采取的技术手段。
如图1至图3所示，其揭示本发明的注射器的推进装置1的一优选实施例，由附图中可以见及，该推进装置1包括一推顶构件10、一单向逆止构件20、一接合构件30、一推进杆40、一弹射件50、一弹簧60、一螺旋套环70以及一注射推杆。
如图3至图8所示，该推顶构件10包括一螺纹推抵件11与一推板12，该螺纹推抵件11的前后两端分别为一前端部111与一后端部112，螺纹推抵件11的外周面形成一螺纹部110，该螺纹推抵件11的外周面还可形成沿着前后轴向直线延伸的至少一槽沟113，于本优选实施例中，该螺纹推抵件11的外周面形成两所述槽沟113，两所述槽沟113于螺纹推抵件11的外周面径向相对设置。该推板12设置于该螺纹推抵件11的前端部111，其中，推板12的中央形成一穿孔121，该螺纹推抵件11的前端部111穿设于该推板12的穿孔121中。如图3所示，该螺纹推抵件11与该推板12分别为独立部件再予以组合，此外，该螺纹推抵件11与该推板12亦可为一体成型的构件(图未示)。
如图3至图8所示，该单向逆止构件20套设于该推顶构件10的外侧，该推顶构件10能于单向逆止构件20中前后轴向直线运动，且该推顶构件10能与该单向逆止构件20一同旋转，该单向逆止构件20包括一环部21以及至少一单向棘齿弹片22，该环部中形成一内环孔210，该内环孔210的孔壁形成轴向延伸的至少一凸缘211，于本优选实施例中，内环孔210的孔壁中形成两所述凸缘211，该推顶构件10的螺纹推抵件11穿设于该环部21的内环孔210中，环部21的凸缘211对应伸入该螺纹推抵件11的槽沟113中，所述单向棘齿弹片22形成于该环部21的外周面，于本优选实施例中，该单向逆止构件20于环部的外周面形成两个所述单向棘齿弹片22，所述单向棘齿弹片22 具有一单向棘齿爪221。
如图3至图8所示，该接合构件30装设于该推顶构件10与单向逆止构件20的外侧，该接合构件30包括一接合基部31以及至少一弹扣32，该接合基部31具有一开口朝前的单向棘齿环槽311以及位于该单向棘齿环槽311后端的一接合板部312，该单向棘齿环槽311中具有多个单斜向棘齿，接合板部312中形成一螺孔313，该接合板部312的螺孔313的齿宽小于该推顶构件10的螺纹推抵件11的螺距，该推顶构件10的推板12位于接合构件30的前端外侧，如图9所示，该单向逆止构件20位于该单向棘齿环槽311中，该单向逆止构件20的单向棘齿弹片22啮合于单向棘齿环槽311中，使单向逆止构件20仅于接合构件30内逆向单向旋转，该推顶构件10的螺纹推抵件11螺设于该接合板部312的螺孔313中，且通过该接合板部312的螺孔313的齿宽小于该推顶构件10的螺纹推抵件11的螺距而有一活动间距，使推顶构件10的螺纹推抵件11能于活动间距的范围内沿该接合板部312中的前后轴向直线运动，所述弹扣32形成于该接合基部31的后端并朝后凸伸，所述弹扣32具有弯曲弹性，于本优选实施例中，该接合构件30具有两个所述弹扣32，两个所述弹扣32形成等角度分布排列，即两弹扣32沿结合构件30的径向相对设置。该接合构件30于接合基部31的后端还形成两个卡合部33，每一卡合部33中形成一卡合孔331，两个所述卡合部33与两个所述弹扣32形成错位排列。
如图3至图8所示，该推进杆40组设于该接合构件30的后端，该推进杆40包括一螺接段41、一前杆端部42与一后杆段43，该螺接段41的外周面形成一推进螺纹，该螺接段41的推进螺纹与该推顶构件10的螺纹推抵件11的螺纹部110的螺纹为相同旋向螺纹，该前杆端部42位于螺接段41的前方，该后杆段43位于螺接段41的后方，该推进杆40的前端具有一开口朝前的前活动室44，该推进杆40于该前活动室44的后方设有一开口朝后的后活动室45，前活动室44与后活动室45之间具有一抵靠板46。
如图3至图8所示，于本优选实施例中，该推进杆40的抵靠板46位于螺接段41内部邻近前杆端部42的前端部位处，前活动室44自推进杆40的前端通过前杆端部42而延伸至螺接段41的前端部位。该推进杆40于前杆端部42中设有至少一槽孔421，所述槽孔421自前杆端部的外周面径向连通该前活动室44，本优选实施例中，前杆端部42设有两个所述槽孔421，于前杆端部42的外周面设有两个卡合凸块422，该推进杆40以前杆端部42组接该接合构件30的后端，其中，接合构件30的卡合部33以卡合孔331与推进杆40的前杆端部42的卡合凸块422卡接组合，接合构件30的弹扣32分别 对应位于推进杆40的槽孔421外侧。
如图3至图8所示，于本优选实施例中，该后活动室45自螺接段41通过后杆段43而延伸至推进杆40的后端，该推进杆40的后杆段43邻近螺接段41的区段形成至少一弹性扣勾47，该推进杆40的后杆段43于所述弹性扣勾47的周边形成一穿槽48，且所述弹性扣勾47的后端连接后杆段43，所述弹性扣勾47的前端为自由端且具有弯曲的弹性。
如图3至图8所示，该弹射件50是装设于该推进杆40的前活动室44内，该弹射件50包括一基板部51、至少一卡勾52以及一弹射顶柱53，所述卡勾52与所述弹射顶柱53是形成于基板部51的前侧并朝前凸伸，于本优选实施例中，该弹射件50具有两所述卡勾52，于起始状态下，所述卡勾52对应卡设于该推进杆40的槽孔421中，使弹射件50位于推进杆40中呈锁定状态，所述弹射顶柱53位于基板部51的中央，且所述弹射顶柱53的位置对应于该螺纹推抵件11的后端部112，于起始状态下，所述弹射顶柱53的前端与螺纹推抵件11的后端部112之间具有一间距。于本优选实施例中，该基板部51的后侧还可形成朝后凸伸的一定位凸缘54。
如图3至图8所示，该弹簧60装设于该推进杆40的前活动室44内，该弹簧60的前后两端分别抵接该弹射件50的基板部51的后侧面以及该推进杆40的抵靠板46，当弹射件50于卡设定位于该推进杆40的前活动室44内的起始状态，该弹簧60是呈压缩状态而蓄积弹性能，于本优选实施例中，该弹簧60的前端套设于弹射件50的基板部51后侧的定位凸缘54的外侧而限位。
如图3至图4及图7至图8所示，该螺旋套环70是螺设于该推进杆40上，该螺旋套环70中形成一螺接孔71，该螺旋套环70以螺接孔71螺设于该推进杆40的螺接段41外侧。
如图3至图4及图7至图8所示，该注射推杆80装设该推进杆40的后活动室45中，该注射推杆80的前端朝向该推进杆40的抵靠板46。
如图10至图13所示，本发明的推进装置1应用于注射器时，以应用于具有药剂定量注射功能的注射器为例，该推进装置1设置于该注射器的一旋转驱动机构中，该旋转驱动机构包括螺旋导管、螺旋套管与螺旋推进杆等，该旋转驱动机构可选用已知注射器的旋转驱动机构，所述螺旋导管、螺旋套管与螺旋推进杆等的组成构造非本发明创作部分，于此不再赘述。惟须说明的是，该旋转驱动机构中的螺旋导管组设于该螺旋套管中，螺旋推进杆螺设于螺旋套管与螺旋导管中，且具备利用大螺距行程运动的功能，本发明 的推进装置1组设于旋转驱动机构中，该螺旋套环70组设于螺旋导管中，而能被驱动定点旋转，该螺旋套环70与推进杆40之间为小螺距行程的螺接构造，使其能利用大螺距行距的旋转推力转换至小螺距行程的注射药剂推力，该推进装置1的注射推杆80伸出旋转驱动机构的后端连接一推杆端盖，利用推杆端盖提供按压的部位。
如图11至图13所示，本发明的推进装置1应用于注射器中，于组接装填有药液的药剂筒2时，推进装置1以组设有该推顶构件10与单向逆止构件20的接合构件30装入具有针头的药剂筒2的后端口2B，通过药剂筒2的后端口2B的周缘压迫接合构件30的弹扣32朝内弯曲，通过弹扣32压抵弹射件50的卡勾52向内弯曲而脱离推进杆40的前杆端部42的槽孔421，呈解锁状态，即原被压缩而蓄积弹性能的弹簧60提供弹力，使弹射件50通过弹力作用而朝前方弹射，并利用弹射件50推动推顶构件10向前运动，直至推顶构件10的前端的推板12抵接药剂筒2中的活塞2A，让使用者能够立即使用结合药剂筒2的注射器进行人体注射，免除手动操作注射器的旋转驱动机构带动推顶构件向前抵接药剂筒内的活塞的排空动作，增进注射器使用的方便性。
当使用者使用注射器进行人体注射，使注射器的注射方式概与现有注射器的使用方式相同，其中，通过该螺旋套环70与该推进杆40之间为小螺距行程的螺接构造，使注射器的旋转驱动机构利用省力的大螺距行距的旋转推力转换至驱动推进杆40产生小螺距行程的直向注射药剂推力，并通过推进杆推顶接合构件30与推顶构件10往前运动而推挤药剂筒2中的药液通过针头注射至人体中，其中，朝前运动的推进杆40经由接合构件30对该推顶构件10提供朝前的推力，该推顶构件的螺纹推抵件11还受到由弹簧60弹力作用的弹射件50于螺纹推抵件11的后端提供推力，且推顶构件10通过单向逆止构件20的单向棘齿弹片22与接合构件30的单向棘齿环槽311之间的啮合构造，而能阻止推顶构件10朝后逆向运动，确保推进装置的推顶构件10与药剂筒2内的活塞2A维持抵接的状态，而能精确控制注射的药剂剂量。
经由前述说明可知，本发明的推进装置能应用于注射器的螺旋驱动机构中，当其组接装填有药液的药剂筒时，该推进装置以组设有该推顶构件与单向逆止构件的接合构件装入具有针头的药剂筒的后端口，通过药剂筒的后端口周缘压迫接合构件的弹扣朝内弯曲，通过弹扣压抵弹射件的卡勾向内弯曲而脱离推进杆的前杆端部的槽孔，呈解锁状态，进而通过被压缩的弹簧释放弹性能，驱动弹射件朝前方弹射而推动推顶构件向前运动，直至推顶构件前端的推板推抵药剂筒中的活塞朝前运动一预定距离，利用活塞朝前运动而推挤药剂筒中的药液而减缩空间，自动迫使药剂筒前端的空气通过针头完全排出，使 药剂筒内完全为药液的状态，让注射器结合药剂筒后，无须手动操作注射器进行药剂筒内的空气排空动作，增进注射器使用的方便性。
再者，本发明的注射器的推进装置利用推顶构件结合单向逆止构件的单向棘齿弹片与接合构件的单向棘齿环槽之间的啮合构造，而能阻止推顶构件朝后逆向运动，确保推进装置的推顶构件与药剂筒内的活塞维持抵接的状态，而能精确控制注射的药剂剂量。
以上所述仅是本发明的优选实施例而已，并非对本发明做任何形式上的限制，虽然本发明已以优选实施例揭露如上，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案的范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明保护的范围内。

Claims (5)

  1. 一种注射器的推进装置，其用以装设于一注射器的螺旋驱动机构中，并能连接一药剂筒，其特征在于，该推进装置包括：
    一推顶构件，其包括一螺纹推抵件与设于该螺纹推抵件前端的一推板，该螺纹推抵件的外周面形成一螺纹部，且该螺纹推抵件的外周面形成至少一槽沟；
    一单向逆止构件，其套设于该推顶构件的外侧，该单向逆止构件包括一环部以及形成于该环部的外周面的至少一单向棘齿弹片，该环部中形成一内环孔，该内环孔的孔壁形成至少一凸缘，该推顶构件的螺纹推抵件穿设于该环部的内环孔中，该环部中的凸缘对应伸入该螺纹推抵件的槽沟中，该推顶构件能于该单向逆止构件中沿着轴向直线运动；
    一接合构件，其装设于该推顶构件与该单向逆止构件的外侧，该推顶构件的推板位于该接合构件的前端外侧，该接合构件包括一接合基部以及形成于该接合基部后端的至少一弹扣，该接合基部具有一开口朝前的单向棘齿环槽以及位于该单向棘齿环槽后端的一接合板部，该接合板部中形成一螺孔，该推顶构件的螺纹推抵件螺设于该接合板部的螺孔中，该接合板部的螺孔的齿宽小于该推顶构件的螺纹推抵件的螺距而形成一活动间距，该推顶构件能于所述活动间距的范围内沿该接合板部的轴向直线运动，该单向逆止构件位于该单向棘齿环槽中，该单向逆止构件的单向棘齿弹片啮合于该单向棘齿环槽；
    一推进杆，其组设于该接合构件的后端，该推进杆包括一螺接段，该螺接段的外周面形成一推进螺纹，所述推进螺纹与该推顶构件的螺纹推抵件的螺纹部的螺纹为相同旋向螺纹，该螺接段的前端具有一前杆端部，该推进杆具有一开口朝前的前活动室以及位于该前活动室后方的一开口朝后的后活动室，该前活动室与该后活动室之间具有一抵靠板，该推进杆于该前杆端部中设有至少一槽孔，所述槽孔自该前杆端部的外周面径向连通该前活动室，该接合构件的弹扣位于该推进杆的前杆端部的外侧且对应于所述槽孔的位置；
    一弹射件，其装设于该推进杆的前活动室内，该弹射件包括一基板部、至少一卡勾以及一弹射顶柱，所述卡勾与所述弹射顶柱形成于该基板部的前侧，所述卡勾对应卡设于该推进杆的槽孔中，所述弹射顶柱位置对应于该螺纹推抵件的后端部，且所述弹射顶柱的前端与螺纹推抵件的后端部之间具有一间距；
    一弹簧，其能压缩地装设于该推进杆的前活动室内，该弹簧的前后两端分别抵接该弹射件的基板部与该推进杆的抵靠板；
    一螺旋套环，其螺设于该推进杆上，该螺旋套环中形成一螺接孔，该推进杆的螺接段螺设于该螺旋套环的螺接孔中；以及
    一注射推杆，其装设于该推进杆的后活动室中。
  2. 根据权利要求1所述的注射器的推进装置，其特征在于，该接合构件具有两所述弹扣，两所述弹扣形成等角度分布排列，该推进杆的前杆端部具有两所述槽孔，两所述槽孔分别对应于两所述弹扣，该弹射件具有两所述卡勾，两所述卡勾分别卡接于相对应的所述槽孔中。
  3. 根据权利要求2所述的注射器的推进装置，其特征在于，该接合构件于该接合基部的后端形成两个卡合部，每一所述卡合部中形成一卡合孔，两个所述卡合部与两个所述弹扣形成错位排列，该推进杆于所述前杆端部中设有两卡合凸块，该接合构件的卡合部通过所述卡合孔与该推进杆的卡合凸块卡接组合。
  4. 根据权利要求3所述的注射器的推进装置，其特征在于，该螺纹推抵件的外周面形成两所述槽沟，两所述槽沟于所述螺纹推抵件的外周面径向相对设置；该单向逆止构件的环部的内环孔的孔壁中形成两所述凸缘，两所述凸缘分别对应伸入两述槽沟中。
  5. 根据权利要求1至4中任一项所述的注射器的推进装置，其特征在于，该推进杆于该螺接段的后方具有一后杆段，该后杆段邻近该螺接段的区段形成至少一弹性扣勾，该推进杆的后杆段于所述弹性扣勾的周边形成一穿槽，所述弹性扣勾的后端连接所述后杆段，所述弹性扣勾的前端为自由端。
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JP6962623B2 (ja) 2021-11-05

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