CN118059349A - Needleless injector and use method thereof - Google Patents
Needleless injector and use method thereof Download PDFInfo
- Publication number
- CN118059349A CN118059349A CN202410399762.7A CN202410399762A CN118059349A CN 118059349 A CN118059349 A CN 118059349A CN 202410399762 A CN202410399762 A CN 202410399762A CN 118059349 A CN118059349 A CN 118059349A
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- Prior art keywords
- piece
- movable
- clamping
- medicine
- piston rod
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 239000003814 drug Substances 0.000 claims description 143
- 230000008569 process Effects 0.000 claims description 25
- 238000009434 installation Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 7
- 238000005381 potential energy Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 2
- 229940079593 drug Drugs 0.000 description 9
- 238000005086 pumping Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- NOESYZHRGYRDHS-UHFFFAOYSA-N insulin Chemical compound N1C(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(NC(=O)CN)C(C)CC)CSSCC(C(NC(CO)C(=O)NC(CC(C)C)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CCC(N)=O)C(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC(N)=O)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CSSCC(NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2C=CC(O)=CC=2)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2NC=NC=2)NC(=O)C(CO)NC(=O)CNC2=O)C(=O)NCC(=O)NC(CCC(O)=O)C(=O)NC(CCCNC(N)=N)C(=O)NCC(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC(O)=CC=3)C(=O)NC(C(C)O)C(=O)N3C(CCC3)C(=O)NC(CCCCN)C(=O)NC(C)C(O)=O)C(=O)NC(CC(N)=O)C(O)=O)=O)NC(=O)C(C(C)CC)NC(=O)C(CO)NC(=O)C(C(C)O)NC(=O)C1CSSCC2NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(NC(=O)C(N)CC=1C=CC=CC=1)C(C)C)CC1=CN=CN1 NOESYZHRGYRDHS-UHFFFAOYSA-N 0.000 description 2
- 229930192334 Auxin Natural products 0.000 description 1
- 102000004877 Insulin Human genes 0.000 description 1
- 108090001061 Insulin Proteins 0.000 description 1
- 239000002363 auxin Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 description 1
- 229940125396 insulin Drugs 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 206010033675 panniculitis Diseases 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 210000004304 subcutaneous tissue Anatomy 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 229960005486 vaccine Drugs 0.000 description 1
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
- A61M5/30—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
-
- 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
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
-
- 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
- A61M5/3129—Syringe barrels
-
- 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
Landscapes
- 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)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention provides a needleless injector and a use method thereof, which relate to the technical field of needleless injection and comprise an injector body and an injector head detachably connected with the injector body.
Description
Technical Field
The invention relates to the technical field of needleless injection, in particular to a needleless injector and a using method thereof.
Background
At present, insulin, auxin, vaccine and the like are injected in a needleless way, a needle is not required to puncture the skin of a human body in the needleless way, high pressure is applied to liquid medicine, and the medicine in the injector forms high-speed and high-pressure jet flow through a nozzle by utilizing the instantaneous high pressure generated by a power source, so that the medicine is injected into subcutaneous equipment of a patient through micropores at the end part, and the medicine penetrates through the outer layer of the skin to subcutaneous tissue layers, intradermal tissue layers and the like to release the medicine effect.
The existing needleless injector generally comprises a medicine tube and a pusher, when in use, the pressure is stored and pressurized through a pressurizing device in the pusher, then the end of the medicine tube is connected with a medicine storage bottle through a needle connector, the medicine liquid in the medicine storage bottle is sucked into the medicine tube through a sucking piston rod, the needle connector is separated, the medicine tube is arranged at the end of the pusher, and when injection is needed, the pressurizing device is released, and the pressurizing device pushes the piston rod to finish the injection of the medicine liquid in the medicine tube. Because the medicine tube is used for manually sucking the piston rod to generate negative pressure in the medicine sucking process, on one hand, the sucking amount cannot be controlled easily due to human factors in the process, and on the other hand, the piston rod is small in size and is troublesome to operate.
In some related art, there are needleless injectors that mount a cartridge directly at the end of a pusher at the time of use and perform pressurizing, aspiration and injection actions sequentially by the pusher. The push rod and piston rod of the pressurizing device are typically end-on connected, and the pressurizing operation is typically accomplished by rotating a housing member on the pusher to compress the spring of the push rod. The pumping operation of the piston rod is realized through a pumping structure arranged in the pusher, however, the pumping structure is required to clamp the piston rod when pumping force is applied to the piston rod, and the pumping structure is required to release clamping force to the piston rod after pumping is completed, so that the pushing rod in the pressurizing device can smoothly push the piston rod to move in the injection process, and thus, the pumping structure is required to be provided with a relatively complex structure to realize the functions, so that the whole needleless injector has the defects of multiple operation steps and inconvenient use.
Disclosure of Invention
In view of this, the present invention provides a needleless injector and a method for using the same, which solves the problems of complex aspiration structure, multiple operation steps and inconvenient use of the existing needleless injector.
The technical scheme of the invention is realized as follows:
In a first aspect, the present invention provides a needleless injector comprising an injector body and an injector head detachably connected to the injector body, wherein,
The injector body comprises a barrel, a pressurizing assembly, a pushing piece, a first movable piece and a second movable piece, wherein the barrel is provided with a first end and a second end which are oppositely arranged, the pressurizing assembly is arranged at the first end of the barrel, the pushing piece is arranged inside the barrel, the first movable piece is sleeved at the first end of the barrel and the outer side of the pressurizing assembly, the first movable piece is in threaded connection with the barrel, the first movable piece can linearly move relative to the barrel and can move together with the pushing piece in the process of moving towards the second end far away from the barrel, the second movable piece is sleeved at the outer side of the second end of the barrel, the second movable piece is in threaded connection with the barrel, and a first clamping structure is arranged at the position, close to the second end, inside the barrel;
The injection head comprises a medicine tube and a piston rod, a medicine storage cavity with an opening at the rear end is arranged in the medicine tube, an injection micropore which is communicated with the medicine storage cavity and the outside is formed at the front end of the medicine tube, the rear end of the medicine tube is detachably connected with the end part of the second movable part, one end of the piston rod is positioned in the medicine storage cavity, the other end of the piston rod extends out of the medicine storage cavity and stretches into the cylinder body, the piston rod can move back and forth in the medicine storage cavity, and one end of the piston rod stretching out of the medicine storage cavity is provided with a second clamping structure which is connected with the first clamping structure;
the second movable part can move linearly relative to the cylinder body and drives the medicine tube to move in the process of moving in the direction away from the first movable part, so that the piston rod moves relative to the medicine tube in the medicine storage cavity and realizes medicine sucking operation;
the pushing piece is provided with a first state and a second state which can be switched, when the pushing piece is in the first state, the pushing piece is clamped with the pressurizing assembly to realize pressurizing operation, and when the pushing piece is in the second state, the pushing piece is separated from the pressurizing assembly and moves towards the second end direction of the cylinder body so as to push the piston rod to move in the medicine storage cavity, so that medicine liquid in the medicine storage cavity is ejected out of the injection micropores.
On the basis of the technical scheme, preferably, the first clamping structure comprises a clamping plate fixedly arranged on the inner wall of the cylinder body, a through hole matched with the outer diameter of the piston rod is formed in the central axis of the clamping plate, and an annular clamping groove is formed in the inner wall of the through hole;
The second clamping structure comprises a clamping piece and a first elastic piece, a first installation cavity is formed in the center of the inside of the piston rod, one or two movable channels communicated with the first installation cavity are formed in the outer wall of the piston rod along the radial direction, the clamping piece comprises a clamping portion and a limiting portion which are connected with each other, the inner diameter of the movable channel is matched with the outer diameter of the clamping portion, the outer diameter of the limiting portion is larger than the outer diameter of the clamping portion, the clamping portion penetrates through the movable channel and extends out of the outside of the piston rod, and the first elastic piece is arranged in the first installation cavity and used for propping against the limiting portion to enable one end, away from the limiting portion, of the clamping portion to be clamped with the annular clamping groove.
Further, preferably, the end part of the piston rod is further provided with a release assembly for disengaging the clamping part from the annular clamping groove, and the release assembly comprises a pressing piece, a second elastic piece and a first fixing ring;
The center of the end part of the piston rod is provided with a second mounting cavity, the pressing piece is arranged in the second mounting cavity, and the second elastic piece is arranged between the second mounting cavity and the pressing piece;
A pressing hole communicated with the first mounting cavity is formed in the center of the bottom surface of the second mounting cavity, a pushing part penetrating through the pressing hole is arranged on the bottom surface of the pressing piece, and a guide surface connected with the pushing part is obliquely arranged on one surface of the limiting part away from the first elastic piece;
The side wall of the pressing piece is provided with a guide block, the axial direction of the inner wall of the second installation cavity is provided with a guide groove matched with the guide block, and the first fixing ring is sleeved on the outer side of the installation piece and fixedly connected with the end part of the piston rod.
On the basis of the technical scheme, preferably, the pressurizing assembly comprises an end cover, a third elastic piece, a locking device and a traction device;
The end cover is detachably arranged at the second end of the cylinder body, the locking device is positioned at one side of the end cover far away from the cylinder body, and a movable hole is formed in the center of the end cover;
The pushing piece comprises a first push rod, a connecting block and a second push rod which are sequentially connected, one end of the first push rod, which is far away from the connecting block, is used for supporting the piston rod to move, the second push rod penetrates through the movable hole and extends to the outer side of the end cover, and the outer edge of the top end of the second push rod is provided with a clamping protrusion connected with the locking device;
The third elastic piece is sleeved on the second push rod between the connecting block and the end cover;
The traction device comprises a traction rod and a second fixed ring, wherein the central axis of one end of the second push rod, which is far away from the connecting block, is provided with a containing hole, one end of the traction rod is fixedly connected with the inner wall of one end of the first movable part, which is far away from the cylinder, the other end of the traction rod is inserted into the containing hole, the traction rod can linearly move in the containing hole, the traction rod is fixedly provided with a limiting protrusion at one end of the containing hole, the second fixed ring is sleeved on the traction rod and is fixedly connected with the end face of the second push rod, and the depth of the containing hole is larger than the length of the traction rod.
On the basis of the technical scheme, preferably, the locking device comprises a mounting plate, locking pieces and a fourth elastic piece, wherein the mounting plate is of a semicircular structure, the mounting plate is vertically and fixedly arranged on one surface of the end cover, which is far away from the cylinder, the central axis of the mounting plate is coaxial with the axis of the second push rod, the locking pieces are respectively arranged on two horizontal side walls of one end of the end cover, which is far away from the mounting plate, the two locking pieces are positioned at the same height of the mounting plate, the locking pieces are provided with opposite clamping ends and driving ends, a rotating pin which is rotationally connected with the horizontal side walls of the mounting plate is arranged between the clamping ends and the driving ends, and a stop block is arranged on the horizontal side walls of the mounting plate and used for driving the clamping ends to rotate towards the inner side of the mounting plate so as to be clamped with the clamping protrusions.
Further, preferably, a blocking portion is provided on a side of the stopper facing the clamping protrusion, and is used for abutting against an end face of the clamping protrusion.
On the basis of the technical scheme, the device preferably further comprises a driving assembly, wherein the driving assembly comprises a first driving piece, a second driving piece and a fifth elastic piece;
The first driving piece is arranged on one side of the annular flange, which is close to the opening of the first moving piece, the second driving piece penetrates through the annular flange and is fixedly connected with the first driving piece, and one end of the traction rod, which is far away from the accommodating hole, is fixedly connected with the second driving piece;
The bottom of the second driving piece is provided with a propping part propping against the bottom surface of the annular flange, the fifth elastic piece is arranged between the annular flange and the first driving piece, one end of the second driving piece, which is far away from the first driving piece, is provided with a horn-shaped driving part, and under the action of external force, the first driving piece and the second driving piece can move towards the direction, which is close to the locking piece, so that the driving part on the second driving piece drives the locking piece to turn over towards the direction, which is far away from the clamping protrusion.
Preferably, the outer side wall of the cylinder is provided with an isolation protrusion, the two sides of the isolation protrusion along the axial direction of the cylinder are respectively extended to form an annular sleeve, and an annular cavity for the first movable piece and the second movable piece to be inserted is formed among the annular sleeve, the isolation protrusion and the cylinder.
In a second aspect, the present invention also provides a method of using a needleless injector, comprising the steps of:
S1, rotating a first movable part to enable the first movable part to move towards one side far away from a second movable part relative to a cylinder body, enabling the first movable part to drive a pushing part to linearly move through a traction device, enabling the pushing part to compress a third elastic part to store energy, and after the pushing part moves in place, clamping with a locking device through a clamping protrusion at the outer edge of the top end of a second push rod to complete pressurizing operation of a needleless injector;
S2, mounting a medicine tube of the injection head on the second movable piece, enabling a piston rod in the medicine tube to extend into the cylinder body, enabling a second clamping structure on the piston rod to be connected with a first clamping structure in the cylinder body, and connecting one end of the medicine tube with injection micropores with a medicine storage bottle through a needle head connector;
S3, rotating the second movable piece, and driving the medicine tube to move in the process that the second movable piece moves away from the first movable piece, so that the piston rod moves relative to the medicine tube in the medicine storage cavity and realizes medicine sucking operation;
S4, after the medicine sucking operation is finished, removing the needle head connector and the medicine storage bottle, rotating the first movable piece to enable the first movable piece to move towards the direction close to the second movable piece relative to the barrel body, and finishing resetting of the first movable piece on the barrel body;
S5, separating the pushing piece from the locking device through a driving assembly at the end part of the first movable piece, moving the pushing piece towards the direction of the second movable piece under the action of the pressurized elastic potential energy, pushing the piston rod to move in the medicine storage cavity, and enabling medicine liquid in the medicine storage cavity to be ejected out of the injection micropores to finish medicine injection operation.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the needleless injector disclosed by the invention, the injector body and the injector head are structurally arranged, when the injector body and the injector head are pressurized, the first movable part is rotated to enable the first movable part to move relative to the cylinder body in a direction away from the second movable part, so that the energy storage pressurizing operation of the pushing part can be realized, the clamping relationship is established between the piston rod and the inside of the cylinder body, when medicine is sucked, the second movable part is rotated to enable the second movable part to move relative to the cylinder body in a direction away from the first movable part, the medicine sucking operation of the injector head can be realized, the pressurizing and medicine sucking processes are mutually independent, and the injector has a simple sucking structure, is convenient to operate and is easy to use.
(2) Through still being provided with the release subassembly that is used for making joint portion and annular draw-in groove break away from the joint at the piston rod tip, when the tip of piston rod is impacted to the impeller, the impeller is at first impacted the push piece, makes the compression second elastic component of push piece, and the push part of push piece bottom surface is through the guide surface cooperation on with spacing portion, makes joint portion follow the interior translation of first installation cavity of moving channel, and joint portion breaks away from smoothly with annular draw-in groove, and the convenience impeller is when impacting the piston rod, does not receive joint resistance, improves the kinetic energy of piston rod at the impact in-process.
(3) Through keeping away from the one end and the second driving piece fixed connection of impeller with the traction rod, first moving part, drive assembly and traction rod are as a whole from this, in carrying out the rotatory translation in-process of first moving part, can realize the pressurization energy storage of impeller to can accomplish impeller and locking device separation through drive assembly, and then realize the medicine injection operation, whole syringe body inner structure is compact, and collaborative operation is strong.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a syringe body and a syringe head according to the present disclosure;
FIG. 2 is an exploded view of the syringe body of the present disclosure;
FIG. 3 is an exploded view of a first movable member, a pressing assembly and a driving assembly according to the present disclosure;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is an enlarged view of a portion of FIG. 3 at B;
FIG. 6 is a schematic view of the syringe body of the present disclosure in an unpressurized state;
FIG. 7 is a schematic view showing a state of the syringe body according to the present invention when the syringe body is pressurized and locked;
FIG. 8 is a schematic diagram of a first movable member after being reset according to the present invention;
FIG. 9 is a schematic view of the injector head of the present invention after being connected to the injector body;
FIG. 10 is a schematic view showing a state of the injection head according to the present invention after sucking the liquid medicine;
FIG. 11 is a schematic view showing a state after a needleless injector of the present invention injects a medicine;
FIG. 12 is an enlarged view of a portion of FIG. 7 at C;
FIG. 13 is an enlarged view of a portion of FIG. 8 at D;
FIG. 14 is an enlarged view of a portion of FIG. 11 at E;
reference numerals:
1. A syringe body; 2. an injection head; 11. a cylinder; 12. a pressurizing assembly; 13. a pushing member; 14. a first movable member; 15. a second movable member; 111. a first clamping structure; 21. a medicine tube; 22. a piston rod; 210. a drug storage cavity; 211. injecting micropores; 221. a second clamping structure; 1111. a clamping plate; 1112. a through hole; 1113. an annular clamping groove; 2211. a clamping piece; 2212. a first elastic member; 22a, a first mounting cavity; 22b, an active channel; 2211a, a clip connection; 2211b, a limit part; 224. releasing the assembly; 2241. a pressing member; 2242. a second elastic member; 2243. a first fixing ring; 22c, a second mounting cavity; 22d, pressing the hole; 2241a, a pushing part; 2211b-1, guide surfaces; 2241b, guide blocks; 22f, guide grooves; 121. an end cap; 122. a third elastic member; 123. a locking device; 124. a pulling device; 1211. a movable hole; 131. a first push rod; 132. a connecting block; 133. a second push rod; 1331. the clamping bulge; 1241. a pulling rod; 1242. a second fixing ring; 1330. a receiving hole; 1243. a limit protrusion; 1231. a mounting plate; 1232. a locking member; 1233. a fourth elastic member; 1232a, a clamping end; 1232b, driving end; 1232c, rotation pins; 1234. a stop block; 1234a, a barrier; 16. a drive assembly; 161. a first driving member; 162. a second driving member; 163. a fifth elastic member; 141. an annular flange; 1621. a holding portion; 1622. a driving section; 110. isolation bumps; 111. an annular sleeve; 113. an annular cavity.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1 and fig. 2-14, an embodiment of the present invention discloses a needleless injector, which comprises an injector body 1 and an injector head 2, wherein the injector head 2 is detachably connected with the injector body 1 to realize needleless injection of a liquid medicine.
The syringe body 1 includes a barrel 11, a pressurizing assembly 12, a pushing member 13, and a first movable member 14.
The cylinder 11 has a straight cylinder structure with two open ends, and has a first end and a second end which are oppositely arranged. The pushing member 13 is provided inside the cylinder 11 as a member for applying an impact force. The pressurizing assembly 12 is disposed at a first end of the cylinder 11, and the pressurizing assembly 12 is used for realizing pressurizing and energy storage of the pushing member 13.
The first movable part 14 is a cylindrical structure with one end open, the first movable part 14 is sleeved on the first end of the cylinder 11 and the outer side of the pressurizing assembly 12, the first movable part 14 is in threaded connection with the cylinder 11, the first movable part 14 can linearly move relative to the cylinder 11, and the pushing part 13 is driven to move together in the process of moving in the direction away from the second end of the cylinder 11.
Specifically, the first movable member 14 is rotated, so that the first movable member 14 moves towards the first end direction of the barrel 11 relative to the barrel 11, the first movable member 14 drives the pushing member 13 to translate in the barrel 11, the pushing member 13 has a switchable first state and a switchable second state, when the pushing member 13 is in the first state, the pushing member 13 is clamped with the pressurizing assembly 12 to realize pressurizing operation, and when the pushing member 13 is in the second state, the pushing member 13 is separated from the pressurizing assembly 12 and moves towards the second end direction of the barrel 11 to realize injection of the liquid medicine in the injection head 2.
The injection head 2 is used for storing liquid medicine and matched with the injector body 1 to realize needleless injection, specifically, the injection head 2 comprises a medicine tube 21 and a piston rod 22, a medicine storage cavity 210 with an opening at the rear end is arranged in the medicine tube 21, an injection micropore 211 which is communicated with the medicine storage cavity 210 and the outside is formed at the front end of the medicine tube 21, one end of the piston rod 22 is positioned in the medicine storage cavity 210, and the other end extends out of the medicine storage cavity 210. The medicine tube 21 is sucked by the suction negative pressure generated by the piston rod 22 moving relative to the medicine tube 21 in the medicine storage chamber 210, and the medicine can be sucked into the medicine storage chamber 210 by sucking the piston rod 22 by connecting the medicine storage bottle to the front end of the medicine tube 21 via the needle connector during suction.
In order to realize that the injection head 2 can be detachably connected with the injector body 1, and meanwhile, after the injection head 2 is connected with the injector body 1, medicine sucking operation can be realized, the embodiment further provides the following technical scheme.
Specifically, the injector body 1 of the present embodiment further includes a second movable member 15, where the second movable member 15 is a cylinder 11 with an opening at one end, the second movable member 15 is sleeved on the outer side of the second end of the cylinder 11, and the second movable member 15 is in threaded connection with the cylinder 11, and the second movable member 15 can rotate and translate relative to the cylinder 11. The rear end of the medicine tube 21 is detachably connected with the end part of the second movable part 15, specifically, one end, far away from the first movable part 14, of the second movable part 15 is provided with a threaded hole for connecting the medicine tube 21, and the side wall of the rear end of the medicine tube 21 is provided with external threads, so that the medicine tube 21 and the second movable part 15 can be conveniently and detachably connected in a threaded mode. The barrel 11 is provided with a first clamping structure 111 at a position close to the second end, one end of the piston rod 22 extending out of the medicine storage cavity 210 is provided with a second clamping structure 221, and when the injection head 2 is installed on the needleless injector body 1, the piston rod 22 passes through the second movable piece 15 to enter the barrel 11, and connection is established between the second clamping structure 221 and the first clamping structure 111 in the barrel 11.
After the pressurization of the syringe body 1 is completed and the connection between the syringe head 2 and the syringe body 1 is completed, the second movable member 15 moves linearly relative to the barrel 11 by rotating the second movable member 15, and drives the medicine tube 21 to move in the moving process in the direction away from the first movable member 14, at this time, since the position between the piston rod 22 and the barrel 11 is kept fixed, when the medicine tube 21 and the second movable member 15 integrally translate relative to the barrel 11, the piston rod 22 can move relative to the medicine tube 21 in the medicine storage cavity 210 and realize medicine sucking operation. After the drug inhalation is completed, when the pushing member 13 is in the second state, the pushing member 13 is separated from the pressurizing assembly 12 and moves towards the second end direction of the cylinder 11, so as to push the piston rod 22 to move in the drug storage cavity 210, and the drug liquid in the drug storage cavity 210 is ejected from the injection micropores 211.
According to the needleless injector disclosed by the invention, the injector body 1 and the injector head 2 are structurally arranged, when the injector body is pressurized, the first movable piece 14 is rotated, so that the first movable piece 14 moves relative to the cylinder 11 in a direction away from the second movable piece 15, the energy storage pressurizing operation of the pushing piece 13 can be realized, the clamping connection relationship is established between the piston rod 22 and the inside of the cylinder 11, when the injector is used for sucking medicine, the second movable piece 15 is rotated, so that the second movable piece 15 moves relative to the cylinder 11 in a direction away from the first movable piece 14, the medicine sucking operation of the injector head 2 can be realized, the pressurizing and medicine sucking processes are mutually independent, and the injector has the advantages of simple structure, convenience in operation and easiness in use.
In order to achieve a detachable connection between the piston rod 22 and the cylinder 11, the present embodiment shows a specific embodiment of the first and second clamping structures 111, 221, with reference to fig. 1, 9, 10, 11 and 14. The first clamping structure 111 includes a clamping plate 1111 fixedly disposed on an inner wall of the cylinder 11, a through hole 1112 adapted to an outer diameter of the piston rod 22 is formed at a central axis of the clamping plate 1111, and an annular clamping groove 1113 is formed in an inner wall of the through hole 1112.
The second clamping structure 221 includes a clamping member 2211 and a first elastic member 2212, a first installation cavity 22a is formed in the center of the interior of the piston rod 22, one or two movable channels 22b communicated with the first installation cavity 22a are formed in the outer wall of the piston rod 22 along the radial direction, the clamping member 2211 includes a clamping portion 2211a and a limiting portion 2211b which are connected with each other, the inner diameter of the movable channel 22b is matched with the outer diameter of the clamping portion 2211a, the outer diameter of the limiting portion 2211b is larger than the outer diameter of the clamping portion 2211a, the clamping portion 2211a penetrates through the movable channel 22b and extends out of the piston rod 22, the first elastic member 2212 is arranged in the first installation cavity 22a and is used for abutting against the limiting portion 2211b so that one end, away from the limiting portion 2211b, of the clamping portion 2211a is clamped with the annular clamping groove 1113.
In this embodiment, the end of the clamping portion 2211a away from the limiting portion 2211b is in a ball structure, and the corresponding annular clamping groove 1113 is adapted to the clamping portion 2211a, preferably, the length of the clamping joint extending out of the movable channel 22b is smaller than 1/2 of the radius of the ball. In this way, after the piston rod 22 passes through the through hole 1112, the clamping portion 2211a is horizontally extruded and then moves towards the first mounting cavity 22a in the movable channel 22b, so as to compress the first elastic member 2212, at this time, the clamping portion 2211a is retracted into the movable channel 22b, and when the clamping portion 2211a corresponds to the annular clamping groove 1113 in position, under the action of the first elastic member 2212, the clamping portion 2211a pops up and smoothly enters into the annular clamping groove 1113, so as to realize the clamping between the clamping portion 2211a and the annular clamping groove 1113.
As some preferred embodiments, the edge of the through hole 1112 where the side of the clamping plate 1111 away from the first movable member 14 is provided with a guiding surface with a tapered structure, so that when the clamping portion 2211a presses the guiding surface, the clamping portion can easily enter the annular clamping groove 1113, so as to facilitate the establishment of the clamping connection between the piston rod 22 and the cylinder 11. When the medicine tube 21 and the syringe body 1 are required to be disassembled, the piston rod 22 is only required to be pulled with force, so that the clamping part 2211a can be separated from the annular clamping groove 1113.
Because the piston rod 22 is inserted into the cylinder 11, after passing through the through hole 1112 on the connecting plate, the connection is established between the clamping part 2211a on the piston rod 22 and the annular clamping groove 1113, when the drug sucking is finished, and in the injection process, the pushing member 13 needs to impact the piston rod 22, so that the piston rod 22 moves towards the drug storage cavity 210, and meanwhile, the clamping part 2211a on the piston rod 22 needs to be separated from the annular clamping groove 1113, because the clamping part 2211a and the annular clamping groove 1113 are clamped, a certain clamping force exists, impact potential energy can be consumed in the impact process of the pushing member 13, and the energy and the speed in the needleless injection process are insufficient.
For this purpose, in this embodiment, a release assembly 224 for disengaging the engagement portion 2211a from the annular engagement groove 1113 is further provided at an end portion of the piston rod 22, and as shown in fig. 11 and 14, the release assembly 224 includes a pressing member 2241, a second elastic member 2242, and a first fixing ring 2243.
The center of the end part of the piston rod 22 is provided with a second mounting cavity 22c, the pressing piece 2241 is arranged in the second mounting cavity 22c, and the second elastic piece 2242 is arranged between the second mounting cavity 22c and the pressing piece 2241; a pressing hole 22d communicated with the first mounting cavity 22a is formed in the center of the bottom surface of the second mounting cavity 22c, a pushing part 2241a penetrating through the pressing hole 22d is formed in the bottom surface of the pressing piece 2241, and a guiding surface 2211b-1 connected with the pushing part 2241a is obliquely arranged on one surface of the limiting part 2211b away from the first elastic piece 2212; the pressing member 2241 is provided with a guide block 2241b on a side wall thereof, a guide groove 22f engaged with the guide block 2241b is provided in an axial direction of an inner wall of the second installation chamber 22c, and the first fixing ring 2243 is fitted over an outer side of the installation member and fixedly connected with an end portion of the piston rod 22.
With the above technical solution, when the pushing member 13 impacts the end of the piston rod 22, the pushing member 13 first impacts the pressing member 2241, so that the pressing member 2241 compresses the second elastic member 2242, and the pushing portion 2241a on the bottom surface of the pressing member 2241 is matched with the guiding surface 2211b-1 on the limiting portion 2211b, so that the clamping portion 2211a translates along the movable channel 22b toward the inside of the first mounting cavity 22a, and the clamping portion 2211a and the annular clamping groove 1113 are smoothly separated, so that the pushing member 13 is not subjected to clamping resistance when impacting the piston rod 22, and kinetic energy of the piston rod 22 in the impact process is improved.
In order to implement the energy-storing and pressurizing operation of the pushing member 13, this embodiment shows a specific structural manner of the pressurizing assembly 12, and referring to fig. 3 to 5, the pressurizing assembly 12 includes an end cap 121, a third elastic member 122, a locking device 123, and a pulling device 124.
The end cover 121 is detachably arranged at the second end of the cylinder 11, the locking device 123 is positioned at one side of the end cover 121 far away from the cylinder 11, and a movable hole 1211 is formed in the center of the end cover 121; the pushing member 13 includes a first push rod 131, a connecting block 132, and a second push rod 133 sequentially connected, wherein one end of the first push rod 131 away from the connecting block 132 is used for supporting the piston rod 22 to move, the second push rod 133 passes through the movable hole 1211 and extends to the outside of the end cover 121, and a clamping protrusion 1331 connected with the locking device 123 is provided at the outer edge of the top end of the second push rod 133; the third elastic member 122 is sleeved on the second push rod 133 between the connecting block 132 and the end cover 121.
The pulling device 124 includes a pulling rod 1241 and a second fixing ring 1242, the central axis of one end of the second push rod 133 away from the connecting block 132 is provided with a receiving hole 1330, one end of the pulling rod 1241 is fixedly connected with the inner wall of one end of the first movable member 14 away from the cylinder 11, the other end of the pulling rod 1241 is inserted into the receiving hole 1330, the pulling rod 1241 can linearly move in the receiving hole 1330, a limiting protrusion 1243 is fixedly arranged at one end of the pulling rod 1241 located in the receiving hole 1330, and the second fixing ring 1242 is sleeved on the pulling rod 1241 and is fixedly connected with the end face of the second push rod 133.
By adopting the above technical scheme, when the injector body 1 is required to store energy and pressurize, the first movable part 14 is rotated to enable the first movable part 14 to translate relative to the cylinder 11 in a direction away from the second movable part 15, the first movable part 14 drives the pull rod 1241 to linearly move, and the limit protrusion 1243 on the pull rod 1241 is matched with the second fixed ring 1242 to drive the whole pushing part 13 to translate in a direction away from the second movable part 15, and the first movable part 14 is rotated and translated, so that the pull rod 1241 can rotate in the accommodating hole 1330 and drive the whole pushing part 13 to move by pushing the second fixed ring 1242 in the translation process. In the translation process of the pushing member 13, the connecting block 132 compresses the third elastic member 122, so that the third elastic member 122 is compressed and stores energy, and when the pushing member 13 moves to a proper position, the clamping protrusion 1331 at the top end of the second push rod 133 is clamped with the locking device 123, so that the pressurization and energy storage operation of the pushing member 13 is completed.
In this embodiment, the depth of the accommodating hole 1330 is greater than the length of the pull rod 1241, so that the first movable member 14 is reset during the pressing process, so as to drive the pull rod 1241 to translate inside the accommodating hole 1330, thereby ensuring that the accommodating hole 1330 matches the moving stroke of the pull rod 1241 with a sufficient space.
In order to realize the position locking of the pushing member 13 after pressurization, this embodiment shows a preferred embodiment of the locking device 123, and specifically, referring to fig. 6-8 and 12, the locking device includes a mounting plate 1231, a locking member 1232 and a fourth elastic member 1233, where the mounting plate 1231 is in a semicircular structure, the mounting plate 1231 is vertically and fixedly disposed on a surface of the end cover 121 far away from the barrel 11, a central axis of the mounting plate 1231 is coaxial with an axis of the second push rod 133, the locking member 1232 is rotatably disposed on two horizontal side walls of one end of the mounting plate 1231 far away from the end cover 121, the two locking members 1232 are located at the same height of the mounting plate 1231, the locking member 1232 has a clamping end 1232a and a driving end 1232b disposed opposite to each other, a rotation pin 1232c rotationally connected to the horizontal side wall of the mounting plate 1231 is disposed between the driving end 1232b and the stopper 1234, and the fourth elastic member 1233 is horizontally disposed between the driving end 1232b and the stopper 1234, so as to drive the clamping end 1232a to rotate toward the inner side of the mounting plate 1331 to be clamped with the clamping boss 1331.
By adopting the technical scheme, the traction rod 1241 and the mounting plate 1231 with the semicircular structure are coaxially arranged, the traction rod 1241 cannot interfere with the locking device 123 in the process of pulling the pushing piece 13 to translate, when the pushing piece 13 is pressed and moved in place, the clamping protrusion 1331 abuts against the clamping end 1232a, the locking piece 1232 is enabled to overturn in the direction away from the clamping protrusion 1331, meanwhile, the driving end 1232b compresses the fourth elastic piece 1233, after the clamping protrusion 1331 passes over the clamping end 1232a, the driving end 1232b is pushed under the action of the fourth elastic piece 1233, the clamping end 1232a is overturned towards the direction of the clamping protrusion 1331, and the clamping operation of the pushing piece 13 and the locking device 123 is established through the clamping of the clamping end 1232 a.
Preferably, a blocking portion 1234a is provided on a side of the stopper 1234 facing the engaging protrusion 1331, for abutting against an end surface of the engaging protrusion 1331. Therefore, when the clamping protrusion 1331 passes over the clamping end 1232a, the blocking part 1234a on the stop block 1234a is blocked in the continuous moving process, and the pressurizing position of the pushing piece 13 is restrained, so that the transitional pressurizing of the pushing piece 13 is avoided.
When the pushing member 13 is pressurized and locked, the pushing member 13 and the locking device 123 need to be separated when injection is required, and for this purpose, a driving assembly 16 is further provided, and the driving assembly 16 is mounted at an end of the first movable member 14 away from the second movable member 15 as shown in fig. 8, 10,11 and 13. The driving assembly 16 includes a first driving member 161, a second driving member 162, and a fifth elastic member 163.
The end of the first movable part 14 far away from the cylinder 11 is provided with an opening, the inner wall of the first movable part 14 is provided with an annular flange 141, the first driving part 161 and the second driving part 162 are respectively positioned at two sides of the annular flange 141, the first driving part 161 is arranged at one side of the annular flange 141 close to the opening of the first movable part 14, the second driving part 162 penetrates through the annular flange 141 and is fixedly connected with the first driving part 161, and one end of the traction rod 1241 far away from the accommodating hole 1330 is fixedly connected with the second driving part 162;
The bottom of the second driving member 162 is provided with a supporting portion 1621 supporting against the bottom surface of the annular flange 141, the fifth elastic member 163 is disposed between the annular flange 141 and the first driving member 161, one end of the second driving member 162 away from the first driving member 161 is provided with a bell-mouth-shaped driving portion 1622, and under the action of external force, the first driving member 161 and the second driving member 162 can move in a direction approaching to the locking member 1232, so that the driving portion 1622 on the second driving member 162 drives the locking member 1232 to turn in a direction away from the locking protrusion 1331.
With the above technical solution, after the pushing member 13 is pressurized and locked, the first movable member 14 is rotated to make the first movable member 14 move and reset towards the second movable member 15 relative to the cylinder 11, at this time, the pull rod 1241 extends into the bottom end of the accommodating hole 1330, after the first movable member 14 is reset, the bottom end of the second driving member 162 is close to the driving end 1232b of the locking member 1232, by pressing the first driving member 161, the first driving member 161 compresses the fifth elastic member 163 along with the second driving member 162, the second driving member 162 translates towards the locking member 1232, the driving portion 1622 on the bottom surface of the second driving member 162 touches the driving end 1232b on the locking member 1232, the driving end 1622 extrudes the driving end 1232b, the driving end 1232b compresses the fourth elastic member 1233, the locking member 1232 is turned over towards a direction away from the locking protrusion 1331, so that the locking protrusion 1331 is separated from the locking end 1232a, under the action of elastic potential energy of the third elastic member 122, the pushing member 13 moves towards the piston rod 22 at a high speed, thereby impacting the piston rod 22, so that the piston rod 22 moves at a high speed in the medicine tube 21, and the injection liquid medicine is ejected from the micro-holes 211.
In the above embodiment, the annular flange 141 is disposed on the inner wall of the first movable member 14, so that the first driving member 161 and the second driving member 162 can be disposed inside the first movable member 14 and are respectively located at two sides of the annular flange 141, meanwhile, the bottom of the second driving member 162 is provided with the supporting portion 1621 that abuts against the bottom surface of the annular flange 141, the fifth elastic member 163 is disposed between the annular flange 141 and the first driving member 161, and in the initial state, the first driving member 161 is not driven by an external force, and the supporting portion 1621 at the bottom of the second driving member 162 always abuts against the bottom surface of the annular flange 141 due to the elastic potential energy of the fifth elastic member 163, so that the whole driving assembly 16 can be limited on the annular flange 141 of the second movable member 15, and the first driving member 161 and the second driving member 162 can move synchronously toward the locking device 123 only when the first driving member 161 receives a pressing force.
It is noted that, the end of the pulling rod 1241 far away from the pushing member 13 is fixedly connected with the second driving member 162, so that the first movable member 14, the driving assembly 16 and the pulling rod 1241 are integrated, and in the process of rotating and translating the first movable member 14, the pressurizing energy storage of the pushing member 13 can be realized, the pushing member 13 and the locking device 123 can be separated through the driving assembly 16, the medicine injection operation can be further realized, the whole syringe body has a compact internal structure, and the cooperation operation is strong.
As some alternative embodiments, the outer side wall of the cylinder 11 is provided with a separation protrusion 110, two sides of the separation protrusion 110 along the axial direction of the cylinder 11 are respectively extended to form an annular sleeve 111, and an annular cavity 113 for inserting the first movable piece 14 and the second movable piece 15 is formed between the annular sleeve 111, the separation protrusion 110 and the cylinder 11. Therefore, when the first movable piece 14 and the second movable piece 15 rotate, the annular sleeve 111 is conveniently and manually maintained, so that the cylinder 11 is kept at a fixed position, the corresponding first movable piece 14 and second movable piece 15 are conveniently operated according to different working conditions, and after the first movable piece 14 and the second movable piece 15 are completely reset, opposite ends of the first movable piece 14 and the second movable piece 15 can be respectively inserted into the annular cavity 113 through the arrangement of the annular cavity 113, so that the whole injector body 1 is stored.
The invention also provides a use method of the needleless injector, which comprises the following steps:
S1, rotating the first movable piece 14 to enable the first movable piece 14 to move towards one side far away from the second movable piece 15 relative to the cylinder 11, enabling the first movable piece 14 to drive the pushing piece 13 to linearly move through the traction device 124, enabling the pushing piece 13 to compress the third elastic piece 122 for energy storage, enabling the pushing piece 13 to be clamped with the locking device 123 through the clamping protrusion 1331 at the outer edge of the top end of the second push rod 133 after moving in place, and completing pressurizing operation of the needleless injector;
S2, mounting a medicine tube 21 of the injection head 2 on the second movable piece 15, enabling a piston rod 22 in the medicine tube 21 to extend into the barrel 11, enabling a second clamping structure 221 on the piston rod 22 to be connected with a first clamping structure 111 in the barrel 11, and enabling one end of the medicine tube 21 with injection micropores 211 to be connected with a medicine storage bottle through a needle connector;
S3, rotating the second movable piece 15, so that the second movable piece 15 drives the medicine tube 21 to move in the process of moving away from the first movable piece 14, and the piston rod 22 moves relative to the medicine tube 21 in the medicine storage cavity 210 and realizes medicine sucking operation;
S4, after the medicine sucking operation is finished, removing the needle head connector and the medicine storage bottle, rotating the first movable piece 14 to enable the first movable piece 14 to move towards the direction close to the second movable piece 15 relative to the cylinder 11, and finishing resetting of the first movable piece 14 on the cylinder 11;
S5, the pushing member 13 is separated from the locking device 123 through the driving assembly 16 at the end part of the first movable member 14, the pushing member 13 moves towards the second movable member 15 under the action of the pressurized elastic potential energy, and the piston rod 22 is pushed to move in the medicine storage cavity 210, so that the medicine liquid in the medicine storage cavity 210 is ejected from the injection micropores 211, and the medicine injection operation is completed.
It should be noted that, in the needleless injector of the present invention, during the use process, the pushing member 13 needs to be pressurized by energy storage, at this time, the injector head 2 cannot be mounted on the injector body 1, so when the injector head 2 is mounted, the pushing member 13 is inserted through the through hole 1112, the pushing member is compressed, and only after the pushing member 13 is pressurized and locked by energy storage, the pushing member is separated from the through hole 1112, so that the injector head 2 is mounted on the second movable member 15 conveniently, and the clamping portion 2211a on the piston rod 22 is also conveniently clamped with the annular groove 1112 of the through hole 1112.
The needleless injector disclosed by the invention can correspondingly rotate the corresponding movable parts during pressurizing and drug sucking, the pressurizing and drug sucking operations are mutually independent, and the needleless injector is convenient to use.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The needleless injector comprises an injector body (1) and is detachably connected with the injector body (1), and is characterized in that:
The injector body (1) comprises a cylinder body (11), a pressurizing assembly (12), a pushing piece (13), a first movable piece (14) and a second movable piece (15), wherein the cylinder body (11) is provided with a first end and a second end which are oppositely arranged, the pressurizing assembly (12) is arranged at the first end of the cylinder body (11), the pushing piece (13) is arranged inside the cylinder body (11), the first movable piece (14) is sleeved at the first end of the cylinder body (11) and the outer side of the pressurizing assembly (12), the first movable piece (14) is in threaded connection with the cylinder body (11), the first movable piece (14) can linearly move relative to the cylinder body (11) and drives the pushing piece (13) to move together in the moving process of moving towards the second end far away from the cylinder body (11), the second movable piece (15) is sleeved at the outer side of the second end of the cylinder body (11), the second movable piece (15) is in threaded connection with the cylinder body (11), and a first clamping structure (111) is arranged at the position, close to the second end, inside the cylinder body (11).
The injection head (2) comprises a medicine tube (21) and a piston rod (22), a medicine storage cavity (210) with an opening at the rear end is arranged in the medicine tube (21), an injection micropore (211) which is communicated with the medicine storage cavity (210) and the outside is formed at the front end of the medicine tube (21), the rear end of the medicine tube (21) is detachably connected with the end part of the second movable part (15), one end of the piston rod (22) is positioned in the medicine storage cavity (210), the other end extends out of the medicine storage cavity (210) and stretches into the cylinder body (11), the piston rod (22) can move back and forth in the medicine storage cavity (210), and one end of the piston rod (22) stretching out of the medicine storage cavity (210) is provided with a second clamping structure (221) which is connected with the first clamping structure (111);
the second movable part (15) can move linearly relative to the cylinder (11) and drives the medicine tube (21) to move in the process of moving away from the first movable part (14), so that the piston rod (22) moves relative to the medicine tube (21) in the medicine storage cavity (210) and realizes medicine sucking operation;
The pushing piece (13) is provided with a first state and a second state which can be switched, when the pushing piece (13) is in the first state, the pushing piece (13) is clamped with the pressurizing assembly (12) to realize pressurizing operation, when the pushing piece (13) is in the second state, the pushing piece (13) is separated from the pressurizing assembly (12) and moves towards the second end direction of the cylinder body (11), so that the piston rod (22) is pushed to move in the medicine storage cavity (210), and the medicine liquid in the medicine storage cavity (210) is ejected by the injection micropores (211).
2. The needleless injector of claim 1, wherein: the first clamping structure (111) comprises a clamping plate (1111) fixedly arranged on the inner wall of the cylinder body (11), a through hole (1112) matched with the outer diameter of the piston rod (22) is formed in the central axis of the clamping plate (1111), and an annular clamping groove (1113) is formed in the inner wall of the through hole (1112);
The second clamping structure (221) comprises a clamping part (2211) and a first elastic part (2212), a first installation cavity (22 a) is formed in the center of the inside of the piston rod (22), one or two movable channels (22 b) which are communicated with the first installation cavity (22 a) are formed in the outer wall of the piston rod (22) along the radial direction, the clamping part (2211) comprises a clamping part (2211 a) and a limiting part (2211 b) which are connected with each other, the clamping part (2211 a) penetrates through the movable channels (22 b) and extends out of the piston rod (22), the first elastic part (2212) is arranged in the first installation cavity (22 a) and is used for propping against the limiting part (2211 b) so that one end, away from the limiting part (2211 b), of the clamping part (2211 a) is clamped with the annular clamping groove (1113).
3. The needleless injector of claim 2, wherein: the end part of the piston rod (22) is also provided with a release assembly (224) for enabling the clamping part (2211 a) to be separated from the annular clamping groove (1113), and the release assembly (224) comprises a pressing piece (2241), a second elastic piece (2242) and a first fixing ring (2243);
the center of the end part of the piston rod (22) is provided with a second installation cavity (22 c), the pressing piece (2241) is arranged in the second installation cavity (22 c), and the second elastic piece (2242) is arranged between the second installation cavity (22 c) and the pressing piece (2241);
A pressing hole (22 d) communicated with the first mounting cavity (22 a) is formed in the center of the bottom surface of the second mounting cavity (22 c), a pushing part (2241 a) penetrating through the pressing hole (22 d) is arranged on the bottom surface of the pressing piece (2241), and a guide surface (2211 b-1) connected with the pushing part (2241 a) is obliquely arranged on one surface, far away from the first elastic piece (2212), of the limiting part (2211 b);
the side wall of the pressing piece (2241) is provided with a guide block (2241 b), the axial direction of the inner wall of the second installation cavity (22 c) is provided with a guide groove (22 f) matched with the guide block (2241 b), and the first fixing ring (2243) is sleeved on the outer side of the installation piece and fixedly connected with the end part of the piston rod (22).
4. The needleless injector of claim 1, wherein: the pressurizing assembly (12) comprises an end cover (121), a third elastic piece (122), a locking device (123) and a traction device (124);
the end cover (121) is detachably arranged at the second end of the cylinder body (11), the locking device (123) is positioned at one side of the end cover (121) far away from the cylinder body (11), and a movable hole (1211) is formed in the center of the end cover (121);
the pushing piece (13) comprises a first push rod (131), a connecting block (132) and a second push rod (133) which are sequentially connected, one end of the first push rod (131) far away from the connecting block (132) is used for supporting the piston rod (22) to move, the second push rod (133) passes through the movable hole (1211) and extends to the outer side of the end cover (121), and the outer edge of the top end of the second push rod (133) is provided with a clamping protrusion (1331) connected with the locking device (123);
the third elastic piece (122) is sleeved on the second push rod (133) between the connecting block (132) and the end cover (121);
The traction device (124) comprises a traction rod (1241) and a second fixing ring (1242), a containing hole (1330) is formed in the position, away from the central axis of one end of the connecting block (132), of the second push rod (133), one end of the traction rod (1241) is fixedly connected with the inner wall of one end, away from the cylinder (11), of the first movable part (14), the other end of the traction rod (1241) is inserted into the containing hole (1330), the traction rod (1241) can linearly move in the containing hole (1330), a limit protrusion (1243) is fixedly arranged at one end, located at the containing hole (1330), of the traction rod (1241), of the second fixing ring (1242) is sleeved on the traction rod (1241) and fixedly connected with the end face of the second push rod (133), and the depth of the containing hole (1330) is larger than the length of the traction rod (1241).
5. The needleless injector as in claim 4, wherein: locking device (123) are including mounting panel (1231), locking piece (1232) and fourth elastic component (1233), mounting panel (1231) are semi-circular structure, vertical fixed setting of mounting panel (1231) is kept away from the one side of barrel (11) in end cover (121), the axis of central axis and second push rod (133) of mounting panel (1231) is coaxial, and mounting panel (1231) is kept away from and is provided with on two horizontal lateral walls of one end of end cover (121) rotation respectively locking piece (1232), and two locking pieces (1232) are located mounting panel (1231) same altitude department, and locking piece (1232) have joint end (1232 a) and drive end (1232 b) that set up relatively, are provided with in the middle of joint end (1232 a) and drive end (1232 b) with mounting panel (1231) horizontal lateral wall rotation connection's rotation round pin (1232 c), be provided with dog (1234) on mounting panel (1231) horizontal lateral wall, fourth elastic component (1233) level sets up in order about between drive end (1232 b) and dog (1234) inboard for joint end (1231) joint with (1331).
6. The needleless injector as in claim 5, wherein: one side of the stop block (1234) facing the clamping protrusion (1331) is provided with a blocking part (1234 a) used for abutting against the end face of the clamping protrusion (1331).
7. The needleless injector as in claim 5, wherein: the device further comprises a driving assembly (16), wherein the driving assembly (16) comprises a first driving piece (161), a second driving piece (162) and a fifth elastic piece (163);
One end of the first movable part (14) far away from the cylinder body (11) is provided with an opening, the inner wall of the first movable part (14) is provided with an annular flange (141), the first driving part (161) and the second driving part (162) are respectively positioned at two sides of the annular flange (141), the first driving part (161) is arranged at one side of the annular flange (141) close to the opening of the first movable part (14), the second driving part (162) penetrates through the annular flange (141) and is fixedly connected with the first driving part (161), and one end of the traction rod (1241) far away from the accommodating hole (1330) is fixedly connected with the second driving part (162);
the bottom of the second driving part (162) is provided with a supporting part (1621) supporting against the bottom surface of the annular flange (141), the fifth elastic part (163) is arranged between the annular flange (141) and the first driving part (161), one end of the second driving part (162) far away from the first driving part (161) is provided with a horn-shaped driving part (1622), under the action of external force, the first driving part (161) and the second driving part (162) can move towards the direction close to the locking part (1232), so that the driving part (1622) on the second driving part (162) drives the locking part (1232) to turn over towards the direction far away from the clamping protrusion (1331).
8. The needleless injector of claim 1, wherein: the cylinder body (11) outer side wall is provided with isolation protrusions (110), the isolation protrusions (110) are respectively formed by extending annular sleeves (111) along two sides of the cylinder body (11) in the axial direction, and annular cavities (113) for inserting the first movable pieces (14) and the second movable pieces (15) are formed among the annular sleeves (111), the isolation protrusions (110) and the cylinder body (11).
9. A method of using the needleless injector of claim 7, comprising the steps of:
S1, rotating a first movable part (14), enabling the first movable part (14) to move towards one side far away from a second movable part (15) relative to a cylinder body (11), enabling the first movable part (14) to drive a pushing part (13) to move linearly through a traction device (124), enabling the pushing part (13) to compress a third elastic part (122) for energy storage, and after the pushing part (13) moves in place, clamping and connecting a clamping protrusion (1331) at the outer edge of the top end of a second push rod (133) with a locking device (123) to finish pressurizing operation of the needleless injector;
S2, mounting a medicine tube (21) of the injection head (2) on the second movable piece (15), enabling a piston rod (22) in the medicine tube (21) to extend into the cylinder body (11), enabling a second clamping structure (221) on the piston rod (22) to be connected with a first clamping structure (111) in the cylinder body (11), and connecting one end of the medicine tube (21) with injection micropores (211) with a medicine storage bottle through a needle connector;
S3, rotating the second movable piece (15), and driving the medicine tube (21) to move in the process that the second movable piece (15) moves away from the first movable piece (14), so that the piston rod (22) moves relative to the medicine tube (21) in the medicine storage cavity (210) and realizes medicine sucking operation;
S4, after the medicine sucking operation is finished, removing the needle head connector and the medicine storage bottle, rotating the first movable piece (14) to enable the first movable piece (14) to move towards the direction close to the second movable piece (15) relative to the cylinder body (11), and finishing resetting of the first movable piece (14) on the cylinder body (11);
S5, the pushing piece (13) is separated from the locking device (123) through the driving assembly (16) at the end part of the first movable piece (14), the pushing piece (13) moves towards the second movable piece (15) under the action of the pressurized elastic potential energy, and the piston rod (22) is pushed to move in the medicine storage cavity (210), so that medicine liquid in the medicine storage cavity (210) is ejected out through the injection micropores (211), and medicine injection operation is completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410399762.7A CN118059349B (en) | 2024-04-03 | 2024-04-03 | Needleless injector and use method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116271341A (en) * | 2023-03-23 | 2023-06-23 | 浙江理工大学 | A pneumatic semi-automatic needle-free injector |
| CN117323508A (en) * | 2023-11-15 | 2024-01-02 | 安徽宏宇五洲医疗器械股份有限公司 | Intelligent automatic loading high-pressure needleless injector |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116271341A (en) * | 2023-03-23 | 2023-06-23 | 浙江理工大学 | A pneumatic semi-automatic needle-free injector |
| CN117323508A (en) * | 2023-11-15 | 2024-01-02 | 安徽宏宇五洲医疗器械股份有限公司 | Intelligent automatic loading high-pressure needleless injector |
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