CN114870163B - Air spring mixed needleless injector - Google Patents
Air spring mixed needleless injector Download PDFInfo
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- CN114870163B CN114870163B CN202210629799.5A CN202210629799A CN114870163B CN 114870163 B CN114870163 B CN 114870163B CN 202210629799 A CN202210629799 A CN 202210629799A CN 114870163 B CN114870163 B CN 114870163B
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- outer sleeve
- gun body
- liquid medicine
- rear end
- gun
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- 239000003814 drug Substances 0.000 claims abstract description 87
- 239000007788 liquid Substances 0.000 claims abstract description 78
- 238000002347 injection Methods 0.000 claims abstract description 62
- 239000007924 injection Substances 0.000 claims abstract description 62
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000035515 penetration Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 230000002265 prevention Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 210000001519 tissue Anatomy 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 206010033675 panniculitis Diseases 0.000 description 3
- 210000004304 subcutaneous tissue Anatomy 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
-
- 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
- A61M5/2053—Media being expelled from injector by pressurised fluid or vacuum
-
- 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
-
- 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
- A61M2005/2026—Semi-automatic, e.g. user activated piston is assisted by additional source of energy
-
- 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
- A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
-
- 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
- A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
- A61M2005/3106—Plugs for syringes without needle
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/42—Reducing noise
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 discloses a gas spring mixed type needleless injector, which comprises a gun body, an outer sleeve, an injection head assembly, a liquid medicine rod, an inner sleeve, a push rod and a locking mechanism, wherein the outer sleeve is glidingly matched in the gun body, the injection head assembly is arranged at the front end part of the gun body and used for containing liquid medicine, the liquid medicine rod is arranged at the front end part of the outer sleeve and used for pushing the liquid medicine in the injection head assembly to inject under the pushing of the outer sleeve, the inner sleeve is glidingly matched in the outer sleeve in a sealing manner, the push rod is glidingly matched in the inner sleeve in a sealing manner and provided with a gas channel, and the locking mechanism is used for locking the position of the outer sleeve relative to the gun body after the outer sleeve moves to a locking position towards the rear end part of the gun body, and an elastic element is arranged between the inner sleeve and the outer sleeve; the rear end of the push rod is provided with a rear one-way valve, and the front end of the inner sleeve is provided with a front one-way valve. The invention takes the gas spring mixing action as a power source, completes the gas spring mixing action energy storage operation in a mode of compressing the elastic element and the gas, and carries out needleless injection by virtue of the mixing energy stored by the release gas spring, thereby having flexible operation and convenient use.
Description
Technical Field
The invention relates to the field of needleless injectors, in particular to a gas spring mixed needleless injector.
Background
Along with rapid development of technology, a needleless injector is more and more highly valued in medical treatment and epidemic prevention processes, and has wide application prospect, and the needleless injector mainly uses electric power to generate high-pressure gas through a high-pressure air pump to push a plunger rod on a piston to enable a liquid medicine rod in a liquid medicine cavity to extrude liquid medicine, and forms high-speed and high-pressure jet flow under the flow increasing and pressurizing effects of the injector and an injection head, so that the medicine flow penetrates through the outer layer of skin to reach tissue layers such as subcutaneous tissue layers, intradermal tissue layers and the like to release the liquid medicine, and a medical injector with a medicine treatment effect is formed; the needleless continuous injection apparatus mainly adopts the energy stored in a gas cylinder and a storage battery to convert into kinetic energy for controlling, compressing and releasing the needleless injection apparatus. In daily work, more air compressors or heavy gas cylinders or storage batteries are required to be carried with the user, so that the injection process of the medicine can be continuously finished on the injected body, and the convenience of injection operation is seriously affected; the storage battery and the air bottle are limited in energy storage, so that the equipment is replaced frequently, the labor intensity is increased, and the working efficiency is influenced; and the noise is big, and the problems of potential safety hazards of high-pressure air and power lines and the like are also existed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a gas spring mixed needleless injector which takes gas spring mixing action as a power source, completes gas spring mixed action energy storage operation in a mode of compressing an elastic element and gas, performs needleless injection by means of mixed energy accumulated by a release gas spring, and has flexible operation and convenient use.
In order to solve the technical problems, the technical scheme of the invention is as follows: a gas spring-loaded needleless injector comprising:
a gun body;
an outer sleeve slidably fitted within the gun body;
an injection head assembly installed at the front end of the gun body and used for accommodating the liquid medicine;
a medicine liquid rod installed at a front end portion of the outer sleeve and used for pushing medicine liquid in the injection head assembly to inject under the pushing of the outer sleeve;
an inner sleeve which is in sealing sliding fit with the outer sleeve, an elastic element is arranged between the inner sleeve and the outer sleeve, the elastic element is used for propping the inner sleeve against the rear end part of the gun body, and the inner sleeve is compressed by the outer sleeve in the process that the outer sleeve moves towards the rear end part of the gun body;
the outer air can sequentially enter a cavity formed by the outer sleeve and the inner sleeve through the rear one-way valve, the air channel and the front one-way valve;
and the locking mechanism is used for locking the position of the outer sleeve relative to the gun body after the outer sleeve moves to the locking position towards the rear end part of the gun body.
There is further provided a specific structure of a locking mechanism comprising:
at least one shoulder arranged on the outer peripheral wall of the inner sleeve, and the shoulder extends out of the gun body;
at least one catch is mounted on the outer sleeve and is adapted to snap into engagement with the shoulder when moved to a locked position.
Further provided is a specific structure of a gun body capable of controlling reciprocating stroke of an outer sleeve to control dosage of injection liquid medicine, the gun body comprising:
the gun body is in sliding fit with the outer sleeve, an axial groove corresponding to the shoulder is formed in the peripheral wall of the rear end part of the gun body, and the shoulder penetrates through the axial groove and can slide in the axial groove;
and the rear cover is in threaded connection with the rear end part of the gun main body, and the rear end surface of the shoulder is abutted against the rear cover by the inner sleeve under the action of the elastic force of the elastic element.
Further for improving the overall strength between the rear cover and the gun body, the rear cover is in threaded connection with the external threads of the rear end part of the gun body through the internal threads thereof; wherein,
the inner end face of the inner thread of the rear cover is provided with an outer chamfer face, the rear end face of the gun main body is provided with an inner chamfer face, and the outer chamfer face is propped against the inner chamfer face.
Further, in order to prevent misunlocking the locking mechanism and further avoid causing safety accidents, the gas spring mixed needleless injector further comprises a condom which is sleeved on the gun body in a sliding manner and a limiting mechanism for limiting the condom in a safety position so that the condom abuts against a lock catch positioned at the locking position to prevent the lock catch from being separated from the shoulder.
In order to further remove air resistance pressure in the early stage of energy storage and facilitate cavity pressurization in the later stage of energy storage, at least one through hole is formed in the peripheral wall of the outer sleeve; wherein,
the through hole is positioned in front of a sealing assembly between the outer sleeve and the inner sleeve in the process that the outer sleeve moves to a locking position towards the rear end part of the gun body;
the through hole is located behind the seal assembly between the outer sleeve and the inner sleeve during movement of the outer sleeve toward the rear end of the gun body to the locked position.
There is further provided a specific construction of an injector head assembly comprising:
a gun barrel with a rear end connected with the front end of the gun body, wherein the rear end of the gun barrel is provided with a liquid medicine cavity for accommodating liquid medicine, and at least one part of the liquid medicine rod stretches into the liquid medicine cavity;
a liquid medicine feeder communicated with the liquid medicine cavity and used for connecting a medicine bottle, wherein a liquid supply unidirectional mechanism used for allowing liquid medicine in the medicine bottle to enter the liquid medicine cavity is arranged in the liquid medicine feeder;
the injection head is arranged at the front end part of the gun barrel, and an injection one-way mechanism for allowing the liquid medicine in the liquid medicine cavity to enter the injection head is arranged between the liquid medicine cavity and the injection head.
Further, in order to prevent looseness between the injection head and the gun barrel and achieve the purpose of leakage prevention, the injection head is in threaded connection with the internal thread at the front end part of the gun barrel through the external thread; wherein,
the outer peripheral wall of the injection head is provided with a first step circle, the rear end face of the first step circle and the front end face of the gun barrel are respectively provided with a first annular groove, a plurality of first retaining grooves are arranged in the first annular grooves, and a rubber locking ring is embedded in a space spliced by the two first annular grooves.
The gun barrel is further in threaded connection with the internal thread at the front end part of the gun body through the external thread thereof in order to prevent the gun barrel from loosening with the gun body so as to achieve the purpose of leakage prevention; wherein,
the outer peripheral wall of the gun barrel is provided with a second step circle, the rear end face of the second step circle and the front end face of the gun body are respectively provided with a second annular groove, a plurality of second retaining grooves are arranged in the second annular grooves, and a rubber anti-loose pad is embedded in a space spliced by the two second annular grooves.
Further, in order to reduce the movement resistance and noise during axial movement, at least one guide ring is provided between the gun body and the outer sleeve and/or between the outer sleeve and the inner sleeve and/or between the inner sleeve and the push rod.
After the technical scheme is adopted, the invention has the following beneficial effects:
1. in the process that the outer sleeve moves towards the rear end part of the gun body, the outer sleeve compresses the elastic element, the cavity formed by the outer sleeve and the inner sleeve is also extruded together to form gas spring mixed energy storage, after the outer sleeve moves to a locked position, the locking mechanism locks the position of the outer sleeve relative to the gun body, so that gas spring double energy storage is completed, when injection is needed, the locking of the outer sleeve by the locking mechanism is released, the energy stored by the elastic element and the compressed gas accumulated in the cavity are released instantaneously, the outer sleeve is pushed, the liquid medicine rod is pushed by the outer sleeve, the liquid medicine rod extrudes the liquid medicine in the injection head assembly, the liquid medicine is sprayed at high speed and high pressure, so that the liquid medicine flows penetrate through the skin outer layer to reach tissue layers such as subcutaneous tissue layers and intradermal tissue layers to release the liquid medicine, and the aim of needleless injection is fulfilled, and the gas spring mixed needleless injector can be operated repeatedly to store and release energy, so that continuous needleless injection is formed, and the gas spring mixed needleless injector is not influenced by kinetic energy conditions such as use field electricity and gas, and the like, and the air injection is more energy-saving and environment-friendly, and wide in use and regional application;
2. in the injection process, if an injection body with a larger month age is encountered, under the condition that the penetration force required by injection is insufficient, the force generated by energy storage of an elastic element is relatively constant, at the moment, a push rod is pushed forward according to different requirements, so that external air sequentially enters a cavity formed by an outer sleeve and an inner sleeve through a rear one-way valve, an air channel and a front one-way valve, the air pressure intensity in the cavity is increased, the purpose of supplementing the penetration force required by penetrating different skin outer layers is achieved, and the air spring mixed needleless injector takes an air spring mixed action as a power source, so that the working efficiency is greatly improved, the working difficulty and the use cost of needleless injection are reduced, and the potential safety hazards possibly caused by dragging operation of high-pressure air and electric pipelines are effectively avoided; the invention has flexible operation and convenient use, enhances the application occasions and application areas of the gas spring mixed type needleless injector, and has high use value;
3. the invention controls the position of the inner sleeve at the rear end part of the gun body by controlling the precession amount of the rear cover, thereby controlling the distance of the reciprocating travel of the outer sleeve, and the ram on the outer sleeve drives the medicine liquid rod to absorb the medicine liquid amount of the corresponding travel, thereby achieving the purpose of controlling the medicine liquid injection dosage;
4. the rear cover is in fastening fit with the gun main body through the connection of the internal thread and the external thread, and the influence of the axial groove on the strength of the gun main body is compensated through the abutting of the internal chamfer surface and the external chamfer surface, so that the overall strength of the structure is remarkably improved;
5. in the process of using the gas spring mixed type needleless injector, when the injector needs to be suspended, the condom is moved backwards to the safety position, the condom is limited to the safety position through the limiting mechanism, the lock catch is abutted by the condom, and the locking mechanism is prevented from being mislocked, so that safety accidents caused by liquid medicine misinjection are avoided.
6. The through hole formed in the outer sleeve is beneficial to removing air resistance pressure of the elastic element in the initial stage of energy storage, so that air resistance phenomenon is avoided when the outer sleeve moves relative to the inner sleeve, primary pressurization of a cavity formed by the inner sleeve and the outer sleeve is conveniently formed when the sealing ring at the front end of the inner sleeve exceeds the through hole, and the aim of energy storage of gas by pushing the push rod is fulfilled;
7. a rubber anti-loosening ring is arranged in the first annular groove of the injection head and the gun barrel, and the rubber anti-loosening ring has the function of preventing the joint of the screw thread of the injection head and the gun barrel from loosening, forming a stopping function and achieving the purposes of preventing loosening of components and preventing leakage of liquid medicine;
8. rubber anti-loosening pads are arranged in two annular grooves II of the gun barrel and the gun body, and the rubber anti-loosening pads are used for preventing loosening phenomenon at the threaded connection part of the gun barrel and the gun body, so that a stopping effect is formed, and the purposes of component anti-loosening and liquid medicine anti-seepage are achieved;
9. at least one guide ring is respectively arranged between the gun body and the outer sleeve, between the outer sleeve and the inner sleeve and between the inner sleeve and the push rod, so that the movement resistance and noise when the outer sleeve moves axially relative to the inner sleeve and the gun body and when the push rod moves axially relative to the inner sleeve can be effectively reduced.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of a gas spring-loaded needleless injector of the present invention;
FIG. 2 is a front view of one embodiment of a gas spring-loaded needleless injector of the present invention;
fig. 3 is an enlarged view of a portion a of fig. 1;
fig. 4 is a cross-sectional view A-A of fig. 1.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, 2, 3, 4, a gas spring-mixed needleless injector, comprising:
a gun body;
an outer sleeve 1 which is in sliding fit with the gun body;
an injection head assembly 2 mounted at the front end of the gun body for accommodating the liquid medicine;
a medicine rod 3 mounted at a front end portion of the outer jacket 1 and for pushing the medicine in the injection head assembly 2 to be injected under the pushing of the outer jacket 1;
an inner sleeve 4 sealingly slidably fitted in the outer sleeve 1, an elastic member 5 being disposed between the inner sleeve 4 and the outer sleeve 1, the elastic member 5 abutting the inner sleeve 4 against a rear end portion of the gun body and being compressed by the outer sleeve 1 during movement of the outer sleeve 1 toward the rear end portion of the gun body;
a push rod 6 which is hermetically and slidingly arranged in the inner sleeve 4 and is provided with a gas channel 61, a rear one-way valve 62 is arranged at the rear end part of the push rod 6, a front one-way valve 41 is arranged at the front end part of the inner sleeve 4, and external gas can sequentially enter a cavity formed by the outer sleeve 1 and the inner sleeve 4 through the rear one-way valve 62, the gas channel 61 and the front one-way valve 41;
and a locking mechanism for locking the position of the outer cover 1 relative to the gun body after the outer cover 1 moves to a locking position toward the rear end of the gun body.
In this embodiment, sealing components are disposed between the inner sleeve 4 and the outer sleeve 1, and between the push rod 6 and the inner sleeve 4, and sealing rings can be used as the sealing components. The elastic element 5 can be a power spring.
In this embodiment, in order to facilitate pushing of the push rod 6, a handle is mounted at the rear end of the push rod 6.
Specifically, in the process that the outer sleeve 1 moves towards the rear end part of the gun body, the outer sleeve 1 compresses the elastic element 5, the cavity formed by the outer sleeve 1 and the inner sleeve 4 is also extruded together to form gas spring mixed motion energy storage, after the outer sleeve 1 moves to a locking position, the locking mechanism locks the position of the outer sleeve 1 relative to the gun body, gas spring double energy storage is completed, when injection is needed, the locking of the outer sleeve 1 by the locking mechanism is released, the energy accumulated by the elastic element 5 and compressed gas accumulated in the cavity are released instantaneously, the outer sleeve 1 is pushed, the liquid medicine rod 3 extrudes the liquid medicine in the injection head assembly 2, the liquid medicine is sprayed at high speed and high pressure, so that the liquid medicine flows penetrate through the skin outer layers to reach tissue layers such as subcutaneous tissue layers and intradermal tissue layers to release the liquid medicine, and the aim of needleless injection is fulfilled; in the injection process, if an injection body with a larger month age is encountered, under the condition that the penetration force required by injection is insufficient, the force generated by energy storage of the elastic element 5 is relatively constant, at the moment, the push rod 6 is pushed forward according to different requirements, so that external air sequentially enters a cavity formed by the outer sleeve 1 and the inner sleeve 4 through the rear one-way valve 62, the air channel 61 and the front one-way valve 41, the air pressure intensity in the cavity is increased, the purpose of supplementing the penetration force required by penetrating different skin layers is achieved, and the air spring mixed needleless injector takes an air spring mixed action as a power source, so that the working efficiency is greatly improved, the working difficulty and the use cost of needleless injection are reduced, and potential safety hazards possibly caused by high-pressure air and electric pipeline dragging operation are effectively avoided; the invention has flexible operation and convenient use, enhances the application occasions and application areas of the gas spring mixed needleless injector, and has high use value.
As shown in fig. 1 and 2, the locking mechanism includes:
at least one shoulder 71 provided on the outer peripheral wall of the inner sleeve 4, the shoulder 71 extending beyond the gun body;
at least one catch 72 is mounted on the outer sleeve 1 and adapted to snap into engagement with the shoulder 71 when moved to a locked position.
In the present embodiment, the shoulder 71 and the catch 72 are provided in two, respectively, but are not limited thereto.
As shown in fig. 1 and 2, in order to control the distance of the reciprocating stroke of the outer sleeve 1, so as to adjust the stroke of the liquid medicine rod 3 to achieve the corresponding medicine amount, and further achieve the purpose of controlling the injection liquid medicine dosage, the gun body comprises:
a gun body 81 in which the jacket 1 is slidably fitted, the gun body 81 having an axial groove provided in a peripheral wall of a rear end portion thereof in correspondence with the shoulder 71, the shoulder 71 passing through the axial groove and being slidable therein;
a rear cover 82 screwed to the rear end of the gun body 81, wherein the inner sleeve 4 abuts the rear end face of the shoulder 71 against the rear cover 82 by the elastic force of the elastic member 5.
Specifically, the invention controls the position of the inner sleeve 4 at the rear end part of the gun body by controlling the precession amount of the rear cover 82, thereby controlling the distance of the reciprocating stroke of the outer sleeve 1, and the ram on the outer sleeve 1 drives the medicine liquid rod 3 to absorb the medicine amount of the corresponding stroke, thereby achieving the purpose of controlling the medicine liquid injection dosage.
As shown in fig. 1, in order to improve the overall strength between the rear cover 82 and the gun body 81, the rear cover 82 is screw-coupled with the external screw thread of the rear end portion of the gun body 81 by the internal screw thread thereof; wherein,
the inner end surface of the internal thread of the rear cover 82 is provided with an external chamfer surface, the rear end surface of the gun body 81 is provided with an internal chamfer surface, and the external chamfer surface is abutted against the internal chamfer surface.
In this embodiment, the inner chamfer and the outer chamfer are each 45 °.
Specifically, the rear cover 82 and the gun main body 81 form a fastening fit through internal and external threaded connection, and the influence of the axial groove on the strength of the gun main body 81 is compensated through the butt joint of the internal and external chamfer surfaces, so that the overall strength of the structure is remarkably improved.
As shown in fig. 1, 2 and 4, in order to prevent misunlocking the locking mechanism and thus avoid safety accidents, the gas spring-mixed needleless injector further comprises a safety sleeve 9 slidably sleeved on the gun body and a limiting mechanism 91 for limiting the safety sleeve 9 to a safety position so that the safety sleeve 9 abuts against the lock catch 72 positioned at the locking position to prevent the lock catch 72 from being separated from the shoulder 71.
In this embodiment, the limiting mechanism 91 includes a spring plunger installed on the safety sleeve 9, a positioning hole is provided at a position of the gun body located at the safety position, the spring plunger is embedded into the positioning hole when the safety sleeve 9 moves to the safety position, three positioning holes are provided in the circumferential direction of the safety position of the gun body, and three spring plungers are also provided.
In this embodiment, in order to fix the position of the condom 9 without using the condom 9, so as to prevent the condom 9 from interfering with the operation of the gas spring-mixed needleless injector, a positioning hole is also provided in the non-safety region of the gun body, and the condom 9 does not interfere with the operation of the gas spring-mixed needleless injector when the condom 9 is moved to the positioning hole for embedding the spring plunger into the non-safety region.
Specifically, in the process of using the gas spring mixed type needleless injector, when the injector needs to be suspended, the condom 9 is moved backwards to a safety position, the condom 9 is limited to the safety position by the limiting mechanism, and the lock catch 72 is abutted against the condom 9, so that the locking mechanism is prevented from being misunlocked, and further, safety accidents caused by liquid medicine misinjection are avoided.
As shown in fig. 1, in order to remove air resistance pressure in the early stage of energy storage and facilitate cavity pressurization in the later stage of energy storage, at least one through hole 11 is formed in the peripheral wall of the outer sleeve 1; wherein,
during the front movement of the outer sleeve 1 towards the rear end of the gun body to the locked position, the through hole 11 is located before the sealing assembly between the outer sleeve 1 and the inner sleeve 4;
the through hole 11 is located behind the sealing assembly between the outer sleeve 1 and the inner sleeve 4 during the movement of the outer sleeve 1 towards the rear end of the gun body to the locked position.
Specifically, the through hole 11 formed on the outer sleeve 1 is beneficial to the elastic element 5 to remove air resistance pressure in the initial stage of energy storage, so that the air resistance phenomenon is avoided when the outer sleeve 1 moves relative to the inner sleeve 4, the primary pressurization of a cavity formed by the inner sleeve 4 and the outer sleeve 1 is also facilitated when the sealing ring at the front end of the inner sleeve 4 exceeds the through hole 11, and the aim of energy storage of gas by pushing the push rod 6 is also facilitated.
As shown in fig. 1, 2, 3, the injection head assembly 2 includes:
a gun barrel 21 with its rear end connected with the front end of the gun body, wherein the rear end of the gun barrel 21 is provided with a liquid medicine cavity for accommodating liquid medicine, and at least a part of the liquid medicine rod 3 extends into the liquid medicine cavity;
a medicine liquid supplier 23 connected with the medicine liquid cavity and used for connecting the medicine bottle 22, wherein a liquid supply unidirectional mechanism 24 used for allowing the medicine liquid in the medicine bottle 22 to enter the medicine liquid cavity is arranged in the medicine liquid supplier 23;
an injection head 25 mounted on the front end of the barrel 21, and an injection unidirectional mechanism 26 for allowing the chemical in the chemical cavity to enter the injection head 25 is mounted between the chemical cavity and the injection head 25.
In this embodiment, the chemical liquid feeder 23 is screwed to the port on the barrel 21 by an external thread at the lower end portion thereof, an anti-seepage ring is provided between the chemical liquid feeder 23 and the port, and an external thread for screwed connection with the medicine bottle 22 is provided at the upper end portion of the chemical liquid feeder 23.
In this embodiment, the medical fluid rod 3 includes a medical fluid push rod and a ram, the front end of the medical fluid push rod stretches into the gun barrel 21, and is sequentially sleeved with a silica gel sleeve and a sealing ring from front to back, the rear end of the medical fluid push rod is provided with an inner hook groove, the rear end of the ram is in threaded connection with the inner thread of the front end of the outer sleeve 1 through the outer thread thereof, the front end of the ram is provided with an outer hook groove, and the outer hook groove of the ram is connected with the inner hook groove of the medical fluid push rod, so that the ram and the medical fluid push rod become the same movable connector of axial movement, namely the medical fluid rod 3.
As shown in fig. 1 and 3, in order to prevent the looseness between the injection head 25 and the gun barrel 21 for the purpose of leakage prevention, the injection head 25 is screwed with the internal thread of the front end portion of the gun barrel 21 by the external thread thereof; wherein,
the outer peripheral wall of the injection head 25 is provided with a first step circle, the rear end face of the first step circle and the front end face of the gun barrel 21 are respectively provided with a first annular groove, a plurality of first retaining grooves are arranged in the first annular groove, and a rubber locking ring 27 is embedded in a space spliced by the two first annular grooves.
In this embodiment, the retaining grooves are equally distributed.
Specifically, rubber check rings 27 are arranged in the annular grooves I of the injection head 25 and the gun barrel 21, and the rubber check rings are used for preventing loosening at the threaded connection position of the injection head 25 and the gun barrel 21 to form a stopping effect, so that the purposes of preventing loosening of components and preventing leakage of liquid medicine are achieved.
As shown in fig. 1 and 3, in order to prevent the gun barrel 21 from loosening from the gun body for leakage prevention, the gun barrel 21 is screwed with the internal thread of the front end of the gun body by the external thread thereof; wherein,
the outer peripheral wall of the gun barrel 21 is provided with a second step circle, the rear end face of the second step circle and the front end face of the gun body are respectively provided with a second annular groove, a plurality of second retaining grooves are arranged in the second annular grooves, and a rubber locking pad 28 is embedded in a space spliced by the two second annular grooves.
In this embodiment, the retaining groove is arranged in half. The gun barrel 21 is sleeved with a conical sleeve at the position behind the second step circle, the diameter of the outer conical surface of the conical sleeve gradually decreases from front to back, and the outer conical surface of the conical sleeve is attached to the inner conical surface of the front end part of the gun body, so that the requirements of looseness prevention and leakage prevention are further met.
Specifically, rubber anti-loosening pads 28 are arranged in two annular grooves of the gun barrel 21 and the gun body, and the rubber anti-loosening pads are used for preventing loosening phenomenon at the threaded joint of the gun barrel 21 and the gun body, so that the anti-loosening effect of the component and the anti-seepage effect of the liquid medicine are achieved.
As shown in fig. 1 and 3, at least one guide ring 10 is respectively installed between the gun body and the outer sleeve 1, between the outer sleeve 1 and the inner sleeve 4, and between the inner sleeve 4 and the push rod 6 in order to reduce movement resistance and noise during axial movement.
In this embodiment, other guiding mechanisms may be used instead of the guiding ring 10.
The technical problems, technical solutions and advantageous effects solved by the present invention have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
Claims (10)
1. A gas spring mixed needleless injector is characterized in that,
it comprises the following steps:
a gun body;
a jacket (1) slidingly fitted in the gun body;
an injection head assembly (2) which is arranged at the front end part of the gun body and is used for containing liquid medicine;
a medicine rod (3) mounted at the front end of the outer sleeve (1) and used for pushing medicine liquid in the injection head assembly (2) to be injected under the pushing of the outer sleeve (1);
an inner sleeve (4) which is in sliding fit in the outer sleeve (1) in a sealing manner, wherein an elastic element (5) is arranged between the inner sleeve (4) and the outer sleeve (1), the elastic element (5) is used for propping the inner sleeve (4) against the rear end part of the gun body, and the inner sleeve is compressed by the outer sleeve (1) in the process that the outer sleeve (1) moves towards the rear end part of the gun body;
the push rod (6) is hermetically and slidingly arranged in the inner sleeve (4) and provided with a gas channel (61), a rear one-way valve (62) is arranged at the rear end part of the push rod (6), a front one-way valve (41) is arranged at the front end part of the inner sleeve (4), and external gas can sequentially enter a cavity formed by the outer sleeve (1) and the inner sleeve (4) through the rear one-way valve (62), the gas channel (61) and the front one-way valve (41);
a locking mechanism for locking the position of the outer cover (1) relative to the gun body after the outer cover (1) moves to a locking position toward the rear end of the gun body; wherein,
the push rod (6) acts to enable external air to enter the cavity formed by the outer sleeve (1) and the inner sleeve (4) sequentially through the rear one-way valve (62), the air channel (61) and the front one-way valve (41), so that the air pressure intensity in the cavity is increased, and the penetration force required for penetrating different skin outer layers is achieved.
2. A gas spring-mixing type needleless injector as claimed in claim 1, wherein,
the locking mechanism includes:
at least one shoulder (71) provided on the outer peripheral wall of the inner sleeve (4), the shoulder (71) extending beyond the gun body;
at least one catch (72) is mounted on the outer sleeve (1) and is adapted to snap into engagement with the shoulder (71) when moved to a locked position.
3. A gas spring-mixing type needleless injector as claimed in claim 2, wherein,
the gun body comprises:
the gun body (81), the overcoat (1) is in sliding fit in the gun body (81), the peripheral wall of the rear end part of the gun body (81) is provided with an axial groove corresponding to the shoulder (71), and the shoulder (71) passes through the axial groove and can slide along the axial groove;
and a rear cover (82) which is in threaded connection with the rear end part of the gun main body (81), wherein the inner sleeve (4) enables the rear end surface of the shoulder (71) to abut against the rear cover (82) under the action of the elastic force of the elastic element (5).
4. A gas spring-mixing type needleless injector as claimed in claim 3, wherein,
the rear cover (82) is in threaded connection with the external thread of the rear end part of the gun main body (81) through the internal thread thereof; wherein,
the inner end face of the inner thread of the rear cover (82) is provided with an outer chamfer face, the rear end face of the gun main body (81) is provided with an inner chamfer face, and the outer chamfer face is propped against the inner chamfer face.
5. A gas spring-mixing type needleless injector as claimed in claim 2, wherein,
the gun also comprises a condom (9) which is sleeved on the gun body in a sliding way and a limiting mechanism (91) which is used for limiting the condom (9) to a safety position so that the condom (9) is propped against a lock catch (72) positioned at a locking position to prevent the lock catch (72) from being separated from the shoulder (71).
6. A gas spring-mixing type needleless injector as claimed in claim 1, wherein,
the peripheral wall of the outer sleeve (1) is provided with at least one through hole (11); wherein,
during the front process of the outer sleeve (1) moving towards the rear end of the gun body to a locking position, the through hole (11) is positioned in front of a sealing assembly between the outer sleeve (1) and the inner sleeve (4);
the through hole (11) is located behind the sealing assembly between the outer sleeve (1) and the inner sleeve (4) during the movement of the outer sleeve (1) towards the rear end of the gun body to the locked position.
7. A gas spring-mixing type needleless injector as claimed in claim 1, wherein,
the injection head assembly (2) comprises:
a gun barrel (21) with the rear end connected with the front end of the gun body, wherein the rear end of the gun barrel (21) is provided with a liquid medicine cavity for containing liquid medicine, and at least one part of the liquid medicine rod (3) stretches into the liquid medicine cavity;
a liquid medicine feeder (23) which is communicated with the liquid medicine cavity and is used for connecting a medicine bottle (22), wherein a liquid supply unidirectional mechanism (24) for allowing the liquid medicine in the medicine bottle (22) to enter the liquid medicine cavity is arranged in the liquid medicine feeder (23);
an injection head (25) mounted at the front end of the gun barrel (21), and an injection unidirectional mechanism (26) for allowing the liquid medicine in the liquid medicine cavity to enter the injection head (25) is mounted between the liquid medicine cavity and the injection head (25).
8. The gas spring-loaded needleless injector of claim 7, wherein,
the injection head (25) is in threaded connection with the internal thread at the front end part of the gun barrel (21) through the external thread; wherein,
the outer peripheral wall of the injection head (25) is provided with a first step circle, the rear end face of the first step circle and the front end face of the gun barrel (21) are respectively provided with a first annular groove, a plurality of first retaining grooves are arranged in the first annular grooves, and a rubber check ring (27) is embedded in a space spliced by the two first annular grooves.
9. The gas spring-loaded needleless injector of claim 7, wherein,
the gun barrel (21) is in threaded connection with the internal thread at the front end part of the gun body through the external thread; wherein,
the gun barrel is characterized in that a second step circle is arranged on the peripheral wall of the gun barrel (21), annular grooves are respectively formed in the rear end face of the second step circle and the front end face of the gun body, a plurality of second retaining grooves are arranged in the second annular grooves, and a rubber anti-loose pad (28) is embedded in a space spliced by the two annular grooves.
10. A gas spring-mixing type needleless injector as claimed in claim 1, wherein,
at least one guide ring (10) is arranged between the gun body and the outer sleeve (1) and/or between the outer sleeve (1) and the inner sleeve (4) and/or between the inner sleeve (4) and the push rod (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629799.5A CN114870163B (en) | 2022-06-06 | 2022-06-06 | Air spring mixed needleless injector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629799.5A CN114870163B (en) | 2022-06-06 | 2022-06-06 | Air spring mixed needleless injector |
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| CN114870163A CN114870163A (en) | 2022-08-09 |
| CN114870163B true CN114870163B (en) | 2023-12-19 |
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| CN202210629799.5A Active CN114870163B (en) | 2022-06-06 | 2022-06-06 | Air spring mixed needleless injector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115591055B (en) * | 2022-08-24 | 2023-11-07 | 江苏乐聚医药科技有限公司 | Differential needleless injector |
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|---|---|
| CN114870163A (en) | 2022-08-09 |
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Effective date of registration: 20230525 Address after: Floor 8, Building 1, No. 22 Xiushui Road, Medical High tech Industrial Development Zone, Taizhou City, Jiangsu Province, 225300 Applicant after: Jiangsu Leju Pharmaceutical Technology Co.,Ltd. Address before: 225300 floor 8-9, building 1, No. 22, Xiushui Road, medical high tech Zone, Taizhou City, Jiangsu Province Applicant before: Jiangsu yimingrong pharmaceutical medical technology Co.,Ltd. |
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