CN115282402B - Spring automatic retraction type safety syringe - Google Patents
Spring automatic retraction type safety syringe Download PDFInfo
- Publication number
- CN115282402B CN115282402B CN202210727530.0A CN202210727530A CN115282402B CN 115282402 B CN115282402 B CN 115282402B CN 202210727530 A CN202210727530 A CN 202210727530A CN 115282402 B CN115282402 B CN 115282402B
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- Prior art keywords
- needle
- needle seat
- positioning
- spring
- push rod
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- 239000003814 drug Substances 0.000 claims abstract description 39
- 238000005452 bending Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 229920001971 elastomer Polymers 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 210000003811 finger Anatomy 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010253 intravenous injection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 210000003462 vein Anatomy 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
-
- 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
- A61M5/31—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
-
- 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
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/31566—Means improving security or handling thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/31566—Means improving security or handling thereof
- A61M5/31573—Accuracy improving means
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
- A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
-
- 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
- A61M2005/3114—Filling or refilling
-
- 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
- A61M2005/3114—Filling or refilling
- A61M2005/3115—Filling or refilling spring-assisted
-
- 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
- A61M2205/27—General characteristics of the apparatus preventing use
- A61M2205/273—General characteristics of the apparatus preventing use preventing reuse, e.g. of disposables
-
- 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
- A61M2205/27—General characteristics of the apparatus preventing use
- A61M2205/276—General characteristics of the apparatus preventing use preventing unwanted use
Abstract
The invention relates to the field of medical syringes, and discloses an automatic spring retraction type safety syringe which comprises a push rod, a syringe, a needle seat, a spring sleeve and a needle body, wherein the push rod stretches into the syringe, the syringe is connected with the spring sleeve, the needle seat is limited in the spring sleeve, the top end of the needle seat stretches into the syringe, and the bottom end of the needle seat stretches out of the spring sleeve and is fixedly connected with the needle body; the spring sleeve is internally provided with a needle seat positioning bending hole, the needle seat is provided with a needle seat positioning piece, the push rod pushes the needle seat to move downwards, the needle seat positioning piece moves into the needle seat positioning bending hole, the spring compression force releases and pushes the needle seat to move inwards, and the needle body is brought into the spring sleeve by the needle seat and is positioned in the spring. The injector exhausts thoroughly, and improves the precision of medicament extraction. Simultaneously, the medicament in the needle cylinder can be completely injected into a human body. After the needle body is pulled away from the human body, the force is continuously applied to the push rod, the spring pushes the needle seat to carry the needle body and the push rod, and the needle seat is pushed into the needle cylinder, so that the problem of secondary utilization is solved.
Description
Technical Field
The invention relates to the field of medical syringes, in particular to an automatic spring retraction type safety syringe.
Background
Injection is an indispensable means in medical procedures, and is developed from a traditional injector to a safe injector and then to a single-hand operated spring retraction type safe injector, but the single-hand operated spring retraction type safe injector also has some defects in operation and limited application range in use, and common problems are as follows:
the spring retraction type safety injector in the current market has the problems that the safety mechanism is to be activated when the rubber plug is pushed to the bottom of the syringe by careless design and structure, and the spring rebounds the needle body into the syringe; the air in the syringe hole cannot be completely exhausted before the medicament is extracted, and the precision operation of medicament extraction is affected.
For example, the application number is: a safety syringe of 20131030412. X. When the rubber plug of the injector is pushed to the bottom of the needle cylinder, air in the needle cylinder cannot be emptied, and the medicament extraction precision is affected.
The spring retraction type safety injector in the market activates a safety mechanism before the rubber plug is pushed to the bottom of the needle cylinder to contact at the end of medicament injection, and the spring rebounds the needle body into the needle cylinder, so that partial medicament cannot be completely injected into a human body.
The spring retraction type safety injector on the market is not suitable for intravenous injection application because the needle body is started to retract in muscle, and the cutting edge of the side face of the needle tip is safe for scratching the vein, so that the application range of the spring retraction type safety injector is limited.
Disclosure of Invention
The present invention addresses the shortcomings of the prior art by providing an automatic retracting spring safety syringe.
In order to solve the technical problems, the invention is solved by the following technical scheme:
the spring automatic retraction type safety injector comprises a push rod, a needle cylinder, a needle seat, a spring sleeve and a needle body, wherein the push rod stretches into the needle cylinder, the lower end part of the needle cylinder is connected with the spring sleeve, the needle seat is mounted in the spring sleeve with a spring limit, the top end of the needle seat stretches into the needle cylinder, and the bottom end of the needle seat stretches out of the spring sleeve and is fixedly connected with the needle body; the spring sleeve is internally provided with a mounting hole, a needle seat positioning bending hole and a spring positioning hole which are communicated in sequence and have gradually reduced pipe diameters, the needle seat is provided with a needle seat positioning piece, and the inner wall of the mounting hole is provided with an in-hole convex ring for limiting the needle seat positioning piece; when the needle body is retracted, the push rod pushes the needle seat to move downwards, the needle seat drives the positioning end of the needle seat positioning piece to move from the mounting hole to the needle seat positioning bending hole, the spring compression force releases and pushes the needle seat to move inwards of the needle cylinder, and the needle body is brought into the spring sleeve by the needle seat and is surrounded by the spring.
The push rod can be pushed to the bottom of the needle cylinder to be in close contact with the needle seat before extracting the medicament to perform exhausting, and then the quantitative medicament is extracted. When in injection, the push rod is pushed to the bottom of the needle cylinder to be in close contact with the needle seat to complete injection, and the medicament can be completely injected into a human body, so that the medicament quantity injected into the human body can be accurately judged. After the needle body is pulled away from the human body, the force is continuously applied to the push rod, and the needle seat positioning piece on the needle seat is sunk into the spring positioning hole of the spring sleeve to bend towards the axle center, so that the spring is released, the spring pushes the needle seat to push the needle body and the push rod together, and the needle seat is pushed into the needle cylinder, so that the problem of secondary utilization is solved. Because the spring only pushes the needle seat and the needle body into the needle cylinder, the elasticity of the spring is smaller than that of the traditional design, so that the cost of the spring is reduced, and the overall cost of the injector is further reduced.
As the needle file as an organic whole needle file, the needle file includes needle file pole, needle file locating seat, needle file sealing part, and needle file sealing part and needle file locating seat are all installed on the needle file pole, and the needle file locating seat is established in needle file sealing part below, is equipped with the seal groove on the needle file sealing part, installs the sealing washer in the seal groove, and the needle file sealing part stretches into in the cylinder, and needle file locating part integrated into one piece that quantity is a plurality of is on the needle file locating seat, is equipped with the medicament passageway that supplies the medicament to pass through on the needle file pole, and the lower tip of needle file pole is equipped with the needle body adhesion hole that is used for installing the needle body. The needle seat is sealed in the needle cylinder through the needle seat sealing part, so that the injector can not leak during air exhaust and injection, the air in the needle cylinder can be completely emptied during air exhaust, and meanwhile, the medicine can be completely injected into a human body during medicine injection.
Preferably, the upper end face of the needle seat positioning piece is a needle seat positioning end face, the needle seat positioning end face is positioned on the lower end face of the convex ring in the hole, a guide arc-shaped surface is arranged at the port of the needle seat positioning bending hole, the lower end face of the positioning end of the needle seat positioning piece is an inclined face, the needle seat positioning piece enters the needle seat positioning bending hole along the guide arc-shaped surface through the inclined face, and the positioning end of the needle seat positioning piece is inwards bent in the needle seat positioning bending hole. When the push rod continues to push the needle seat, the inclined plane of the needle seat positioning piece enters the needle seat positioning bending hole along the guiding arc surface of the needle seat positioning bending hole, and the needle seat positioning piece can smoothly enter the needle seat positioning bending hole due to the functions of the inclined plane and the guiding arc surface.
Preferably, the mounting hole is internally provided with a needle seat positioning sleeve, the hole inner convex ring is arranged on the inner wall of the needle seat positioning sleeve, the outer side wall of the lower end part of the needle seat positioning sleeve is provided with a first positioning sleeve convex rib, the mounting hole is a countersunk hole, the small hole end opening of the mounting hole is provided with a second positioning sleeve convex rib protruding inwards, and when the needle seat positioning sleeve is arranged in the mounting hole, the first positioning sleeve convex rib passes through the second positioning sleeve convex rib to position the needle seat positioning sleeve on the spring sleeve. The needle seat positioning sleeve facilitates the installation of the needle seat in the spring sleeve, and further facilitates the limit of the needle seat positioning piece on the convex ring in the hole. The needle seat positioning sleeve is arranged on the spring sleeve in a mode that the protruding ribs of the first positioning sleeve cross the protruding ribs of the second positioning sleeve, the needle seat positioning sleeve and the spring sleeve are convenient to assemble, and meanwhile, the needle seat positioning sleeve and the spring sleeve are not easy to loosen.
Preferably, the inner wall of the needle seat positioning sleeve is also provided with a first positioning convex rib, the first positioning convex rib is arranged above the hole convex ring, the outer side wall of the joint of the lower end of the needle cylinder is provided with a second positioning convex rib, and when the needle cylinder is inserted into the needle seat positioning sleeve, the second positioning convex rib passes through the first positioning convex rib to be limited between the first positioning convex rib and the hole convex ring. The needle cylinder and the needle seat positioning sleeve are assembled in a simple and convenient way, and are not easy to loosen.
Preferably, the inner wall of the needle seat positioning sleeve is provided with an internal thread, the internal thread is arranged above the convex ring in the hole, the outer side wall of the joint of the lower end of the needle cylinder is provided with an external thread, and the needle cylinder is in threaded connection with the internal thread of the needle seat positioning sleeve through the external thread. The needle cylinder and the needle seat positioning sleeve are simple and convenient to assemble, looseness is not easy to occur between the needle cylinder and the needle seat positioning sleeve, and meanwhile, the thread assembling mode is convenient for people to integrally replace the needle seat and the needle body.
Preferably, the push rod is a combined push rod, the push rod comprises a push rod handle part, a hollow pipe and a rubber plug, the rubber plug is fixed at the bottom end of the hollow pipe, a first convex rib and a second convex rib are arranged at the inner end of the hollow pipe, a clamping groove is formed between the first convex rib and the second convex rib, and a convex part is arranged at the lower end part of the push rod handle part; when the medicament is extracted and pushed, the push rod handle part is clamped in the clamping groove of the hollow tube through the bulge part, and the push rod handle part and the hollow tube synchronously lift; when the needle body is retracted, the protruding part of the handle part of the push rod passes over the second protruding rib and is retracted into the hollow tube. When the needle body is contracted in the needle cylinder, the push rod handle part is pushed continuously, the protruding part of the push rod handle part is separated from the clamping groove, and the push rod handle part can enter the hollow tube, so that people cannot push the push rod handle part, and the secondary utilization of the injector is further avoided.
Preferably, the push rod handle part is an integrated handle part, the push rod handle part comprises a handle, an upper push rod and a guide cone head, the upper push rod is arranged between the handle and the guide cone head, and the bulge part is arranged on the guide cone head; the needle cylinder is an integrated needle cylinder, the needle cylinder comprises a cylinder body and an operating handle, the operating handle is arranged at the top end of the cylinder body, and a groove for hiding the handle is formed in the operating handle. After the push rod handle part enters the hollow tube, the handle on the push rod handle part can be hidden on the operating handle of the syringe, so that the secondary utilization of the syringe is further avoided.
Preferably, the lower end part of the hollow pipe is integrally formed with a connector, a convex hull which bulges outwards is arranged on the connector, a plug hole is arranged on the rubber plug, an outwards concave cavity is formed in the inner wall of the plug hole, when the connector stretches into the plug hole of the rubber plug, the convex hull is limited on the cavity, a convex ring is arranged on the outer wall of the bottom end of the rubber plug, and the rubber plug is installed in the needle cylinder in a sealing manner through the convex ring. The hollow tube is connected with the rubber plug in a clamping way through the convex hull on the joint, the connection between the hollow tube and the rubber plug is firm, and the hollow tube and the rubber plug cannot be easily separated when the hollow tube moves up and down in the needle cylinder with the rubber plug.
Preferably, the spring sleeve is sleeved with a needle protecting cover for protecting the needle body, the outer side wall of the lower end of the spring sleeve is provided with a first sheath protruding rib, the inner hole wall of the needle protecting cover is provided with a second sheath protruding rib, and when the needle protecting cover is arranged on the spring sleeve, the first sheath protruding rib passes over the second sheath protruding rib. The needle protecting cover is used for protecting the needle body, and meanwhile, the needle protecting cover and the spring sleeve are convenient to assemble.
The invention has the remarkable technical effects due to the adoption of the technical scheme:
the rubber plug can be driven by the push rod to push the rubber plug to the bottom of the needle cylinder to be in close contact with the needle seat before extracting the medicament, so that the air of the needle cylinder can be exhausted thoroughly, and the medicament extraction precision is improved. When in injection, the rubber plug push rod is pushed to the bottom of the needle cylinder to be in close contact with the needle seat to complete injection, and the medicament can be completely injected into a human body, so that the medicament quantity injected into the human body can be accurately judged. After the needle body is pulled away from the human body, the force is continuously applied to the push rod, the needle seat positioning piece on the needle seat is sunk into the spring positioning hole of the spring sleeve to bend towards the axis, the push rod handle part is continuously pushed, the protruding part of the push rod handle part is separated from the clamping groove, and the push rod handle part enters into the hollow tube to release the spring, so that the spring is released, the spring pushes the needle seat to carry the needle body and the push rod, and the needle seat is pushed into the needle cylinder, so that the problem of secondary utilization is solved.
Drawings
FIG. 1 is a schematic diagram of a modular construction of the present invention.
Fig. 2 is a schematic diagram of an explosive structure according to a first form of the invention.
Fig. 3 is a schematic view of the structure of the push rod handle portion of fig. 2.
Fig. 4 is a schematic structural view of the hollow tube of fig. 2.
Fig. 5 is a schematic view of the structure of the rubber plug in fig. 2.
Fig. 6 is a schematic view of a partial structure of the junction of the push rod handle portion and the hollow tube.
Fig. 7 is a schematic view of the structure of the cylinder of fig. 2.
Fig. 8 is a schematic view showing the structure in which the push rod is fitted into the cylinder.
Fig. 9 is a schematic view of the structure of the hub of fig. 2.
Fig. 10 is a schematic view of the structure of the hub positioning sleeve of fig. 2.
Fig. 11 is a schematic view of the spring sleeve of fig. 2.
Fig. 12 is a schematic view of the structure of the needle shield of fig. 2.
Fig. 13 is a schematic diagram of the first embodiment of the present invention.
Fig. 14 is a partial schematic view of the needle cylinder installed at the location of the needle hub locating sleeve.
Fig. 15 is a schematic view of the first construction of the invention with the needle retracted within the spring sleeve.
Fig. 16 is a schematic view showing the structure of the cylinder in the second construction of the present invention.
Fig. 17 is a schematic view of a needle seat positioning sleeve in a second construction form of the present invention.
The names of the parts indicated by the numerical reference numerals in the above drawings are as follows:
1-push rod, 4-needle cylinder, 5-sealing ring, 6-needle seat, 7-spring, 8-needle seat positioning sleeve, 9-spring sleeve, 10-needle body and 11-needle protecting cover
1-push rod handle part, 1-2-hollow tube, 1-3-rubber plug, 1-1.1-bulge, 1-1.2-handle, 1-1.3-push rod, 1-1.4-guide cone head, 1-2.1-first convex rib, 1-2.2-second convex rib, 1-2.3-clamping groove, 1-2.4-connector, 1-2.5-convex hull, 1-3.1-plug hole, 1-3.2-cavity and 1-3.3-convex ring
4-1-cylinder, 4-2-operating handle, 4-6-second positioning convex rib, 4-7-external screw thread, 4-2.1-groove,
6-1-needle body adhesion hole, 6-2-medicament channel, 6-3-needle seat sealing part, 6-4-needle seat positioning piece, 6-5-needle seat positioning seat, 6-needle seat rod, 6-3.1-sealing groove, 6-4.1-needle seat positioning end face and 6-4.2-inclined face
8-2-first positioning convex rib, 8-3-first positioning sleeve convex rib, 8-5-hole convex ring, 8-6-internal thread,
9-1-mounting holes, 9-2-second positioning sleeve ribs, 9-3-needle seat positioning bending holes, 9-4-spring positioning holes, 9-7-first sheath ribs and 9-3.1-guiding arc surfaces
11-2-second sheath rib
Detailed Description
The invention is described in further detail below with reference to figures 1-17 and examples.
Example 1
The spring automatic retraction type safety injector comprises a push rod 1, a needle cylinder 4, a needle seat 6, a spring 7, a spring sleeve 9 and a needle body 10, wherein the push rod 1 stretches into the needle cylinder 4, so that the air exhaust and medicament extraction of the needle cylinder 4 are realized, the lower end part of the needle cylinder 4 is detachably connected with the spring sleeve 9, the needle seat 6 is mounted in the spring sleeve 9 in a limiting manner with the spring 7, the top end of the needle seat 6 stretches into the needle cylinder 4, the bottom end of the needle seat extends out of the spring sleeve 9 and is fixedly connected with the needle body 10, the upper end of the spring 7 is propped against the needle seat 6, the lower end of the spring 7 is supported in the spring sleeve 9, and when the injector is used for air exhaust or medicament extraction, the spring 7 is compressed in the spring sleeve 9 by the needle seat 6, and meanwhile, the needle seat 6 is limited on the spring sleeve 9. The spring sleeve 9 is internally provided with a mounting hole 9-1, a needle seat positioning bending hole 9-3 and a spring positioning hole 9-4 which are sequentially communicated and gradually reduced in pipe diameter, the needle seat positioning bending hole 9-3 and the spring positioning hole 9-4 are cylindrical holes, the needle seat 6 is provided with a needle seat positioning piece 6-4, the needle seat positioning piece 6-4 is integrally injection molded on the needle seat 6, and the inner wall of the mounting hole 9-1 is provided with an in-hole convex ring 8-5 for limiting the needle seat positioning piece 6-4. When the needle body 10 is retracted, the push rod 1 pushes the needle seat 6 to move downwards, the needle seat 6 drives the positioning end of the needle seat positioning piece 6-4 to move from the mounting hole 9-1 to the needle seat positioning bending hole 9-3, namely, the positioning end of the needle seat positioning piece 6-4 is bent in the needle seat positioning bending hole 9-3, so that the spring 7 can push the bent needle seat positioning piece 6-4 to pass through the hole inner convex ring 8-5. The compression force of the spring 7 is released and pushes the needle holder 6 into the barrel 4, and the needle body 10 is carried by the needle holder 6 into the spring sleeve 9 and within the envelope of the spring 7.
The needle seat 6 is an integrally injection molded needle seat, the needle seat 6 comprises a needle seat rod 6-6, a needle seat positioning seat 6-5 and a needle seat sealing part 6-3, the needle seat sealing part 6-3 and the needle seat positioning seat 6-5 are integrally molded on the needle seat rod 6-6, the needle seat positioning seat 6-5 is arranged below the needle seat sealing part 6-3, a sealing groove 6-3.1 is arranged on the needle seat sealing part 6-3.1, a sealing ring 5 is arranged in the sealing groove 6-3.1, the sealing ring 5 is an O-shaped rubber sealing ring, the needle seat sealing part 6-3 extends into the needle cylinder 4, a plurality of needle seat positioning pieces 6-4 are integrally molded on the needle seat positioning seat 6-5, the number of needle seat positioning pieces 6-4 is 2 in this embodiment, 2 needle seat positioning pieces 6-4 are symmetrically arranged on the needle seat positioning seat 6-5, a medicament channel 6-2 for medicament passing through is arranged on the needle seat rod 6-6, the medicament firstly enters the medicament channel 6-2 of the needle seat rod 6-6 through the needle body 10, then is sucked into the needle cylinder 4 through the channel 6-2, the needle seat 6-4 is provided with a lower end part for being adhered to the needle seat 6-1, and the needle seat 6-1 is not adhered to the needle seat body 6-1.
The upper end face of the needle seat positioning piece 6-4 is a needle seat positioning end face 6-4.1, the needle seat positioning end face 6-4.1 is positioned on the lower end face of the in-hole convex ring 8-5, a guide arc face 9-3.1 is arranged at the port of the needle seat positioning curved hole 9-3, the guide arc face 9-3.1 is a chamfer angle at the port of the top end of the needle seat positioning curved hole 9-3, the lower end face of the positioning end of the needle seat positioning piece 6-4 is an inclined face 6-4.2, the needle seat positioning piece 6-4 enters the needle seat positioning curved hole 9-3 along the guide arc face 9-3.1 through the inclined face 6-4.2, the positioning end of the needle seat positioning piece 6-4 is inwards bent in the needle seat positioning curved hole 9-3, after the needle seat positioning piece 6-4 is bent in the needle seat positioning curved hole 9-3, when the needle seat 6-5 is blocked downwards by the lower end face of the needle seat positioning curved hole 9-3, the boss 1-1.1 of the push rod handle part 1-1 breaks away from the clamping groove 1-2.3, the push rod handle part 1-1 enters the hollow tube 1-2, and accordingly the needle seat positioning piece 6-4 is not pushed by the spring 6-1-2, and the compression force of the needle seat positioning piece 6-4 is not limited by the convex ring is released when the needle seat positioning piece 6-4 is pushed into the hollow tube 7. When the needle seat positioning piece 6-4 enters the needle seat positioning bending hole 9-3, the compression force of the spring 7 is released, so that the spring 7 can push the needle seat 6 to move into the needle cylinder 4.
The push rod 1 is a combined push rod, the push rod 1 comprises a push rod handle part 1-1, a hollow tube 1-2 and a rubber plug 1-3, the hollow tube 1-2 is cylindrical, the rubber plug 1-3 is made of an elastomer material, the rubber plug 1-3 is fixed at the bottom end of the hollow tube 1-2, a first convex rib 1-2.1 and a second convex rib 1-2.2 are arranged at an in-tube port of the hollow tube 1-2, a clamping groove 1-2.3 is formed between the first convex rib 1-2.1 and the second convex rib 1-2.2, and a convex part 1-1.1 is arranged at the lower end part of the push rod handle part 1-1; when the medicament is extracted and pushed, the push rod handle part 1-1 is clamped in the clamping groove 1-2.3 of the hollow tube 1-2 through the bulge part 1-1.1, and the push rod handle part 1-1 and the hollow tube 1-2 synchronously lift; when the needle body 10 is retracted, the push rod handle part 1-1 is pushed by the force, so that the protruding part 1-1.1 of the push rod handle part 1-1 passes over the second protruding rib 1-2.2 and is retracted into the hollow tube 1-2, and the push rod handle part 1-1 and the hollow tube 1-2 cannot synchronously lift, thereby avoiding the secondary use of the injector by people.
The push rod handle part 1-1 is an integrally injection molded handle part, the push rod handle part 1-1 comprises a handle 1-1.2, an upper push rod 1-1.3 and a guide cone head 1-1.4, the upper push rod 1-1.3 is arranged between the handle 1-1.2 and the guide cone head 1-1.4, namely, the top end of the upper push rod 1-1.3 is fixedly connected with the handle 1-1.2, the bottom end of the upper push rod 1-1.3 is fixedly connected with the guide cone head 1-1.4, and the guide cone head 1-1.4 is used as an alignment axis center in the assembly process, so that the push rod handle part 1-1 can be smoothly installed in the hollow tube 1-2, the shape of the handle 1-1.2 is a disc type, the upper push rod 1-1.3 is the cross type upper push rod 1-1.3, the guide cone head 1-1.4 is a round table type, the protruding part 1-1.1 is arranged at the large end position of the guide cone head 1-1.4, and the guide cone head 1-1.4 is small in the downward direction. The needle cylinder 4 is an integrated needle cylinder, the front projection shape of the needle cylinder 4 is T-shaped, the needle cylinder 4 comprises a cylinder body 4-1 and an operating handle 4-2, the operating handle 4-2 is arranged at the top end of the cylinder body 4-1, a groove 4-2.1 for hiding the handle 1-1.2 is arranged on the operating handle 4-2, and the shape of the groove 4-2.1 is the same as that of the handle 1-1.2, namely, the groove 4-2.1 is a circular groove. When the medicament is injected, the middle finger and the index finger of a person clamp the cylinder body 4-1 and are limited on the lower end surface of the operating handle 4-2, and the thumb pushes the push rod 1 to move in the needle cylinder 4.
The lower end part of the hollow tube 1-2 is integrally formed with a joint 1-2.4, the joint 1-2.4 is provided with a convex hull 1-2.5 which bulges outwards, the rubber plug 1-3 is provided with a plug hole 1-3.1, the inner wall of the plug hole 1-3.1 is provided with a cavity 1-3.2 which is sunken outwards, when the joint 1-2.4 stretches into the plug hole 1-3.1 of the rubber plug 1-3, the convex hull 1-2.5 is limited on the cavity 1-3.2, the outer wall of the bottom end of the rubber plug 1-3 is integrally formed with a convex ring 1-3.3, the rubber plug 1-3 is arranged in the needle cylinder 4 in a sealing way through the convex ring 1-3.3, and the convex ring 1-3.3 ensures that medicament in the needle cylinder 4 cannot leak along the push rod 1.
The spring sleeve 9 is sleeved with a needle protecting cover 11 for protecting the needle body 10, the outer side wall of the lower end of the spring sleeve 9 is provided with a first protecting sleeve convex rib 9-7, the inner hole wall of the needle protecting cover 11 is provided with a second protecting sleeve convex rib 11-2, and when the needle protecting cover 11 is arranged on the spring sleeve 9, the first protecting sleeve convex rib 9-7 passes over the second protecting sleeve convex rib 11-2.
Using the operational flow (one), the step of exhausting is performed prior to extracting the medicament: the push rod 1 is pushed into the needle cylinder 4 until the rubber plug 1-3 contacts the bottom of the needle cylinder 4 and contacts the upper end of the needle seat 6, so that the residual air is completely exhausted.
Using operational flow (two), the extraction of the medicament step: the needle shield 11 is removed and the needle 10 is inserted into the medicament and the ram 1 is moved away from the barrel 4 to draw the medicament into the barrel 4 until the medicament is required.
Using operational procedure (iii), an injection step is performed: pushing the push rod handle part 1-1 until the bottom of the rubber plug 1-3 abuts against the end face of the top end of the needle seat 6, injecting all the medicament into the human body, and pulling out the needle body 10 from the human body to complete the injection operation.
Using the operational procedure (four), the step of activating the safety mechanism to retract the needle 10 inside the needle cylinder 4: the rubber plug 1-3 pushes the needle seat 6 to move downwards by applying force on the handle part 1-1 of the push rod with compression force larger than the spring 7, the inclined surface 6-4.2 of the needle seat positioning piece 6-4 is guided by the guide arc surface 9-3.1, so that the needle seat positioning piece 6-4 is bent, namely, the connection part of the needle seat positioning piece 6-4 and the needle seat positioning piece 6-5 is bent, the needle seat positioning end surface 6-4.1 is sunk into the spring sleeve 9, and the needle seat positioning piece 6-4 is bent towards the axis because the aperture of the needle seat positioning piece bending hole 9-3 is smaller, and when the needle seat positioning piece 6-5 is abutted against the bottom surface of the needle seat positioning bending hole 9-3, the needle seat positioning piece 6-4 is blocked; at this time, the force is transferred to the joint of the push rod handle part 1-1 and the hollow tube 1-2, the boss part 1-1.1 of the push rod handle part 1-1 is retracted into the hollow tube 1-2 beyond the second boss rib 1-2.2, the needle seat 6 is pushed into the needle cylinder 4 with the needle body 10 and the rubber plug 1-3 due to the release of the compression force of the spring 7, and the needle body 10 is protected at the center of the spring 7.
Example 2
Embodiment 2 is basically the same as embodiment 1 in characteristics, except that a needle seat positioning sleeve 8 is installed in a mounting hole 9-1, an in-hole convex ring 8-5 is arranged on the inner wall of the needle seat positioning sleeve 8, a first positioning sleeve convex rib 8-3 is arranged on the outer side wall of the lower end part of the needle seat positioning sleeve 8, the mounting hole 9-1 is a countersunk hole, a second positioning sleeve convex rib 9-2 protruding inwards is arranged at the small hole end opening of the mounting hole 9-1, and the small end hole diameter of the mounting hole 9-1 is larger than that of the needle seat positioning bending hole 9-3. When the needle seat positioning sleeve 8 is arranged in the mounting hole 9-1, the first positioning sleeve convex rib 8-3 passes over the second positioning sleeve convex rib 9-2 to position the needle seat positioning sleeve 8 on the spring sleeve 9. The needle seat positioning sleeve 8 is used for limiting the needle seat positioning piece 6-4, so that the needle seat 6 is conveniently and firstly arranged in the spring sleeve 9.
The inner wall of the needle seat positioning sleeve 8 is also provided with a first positioning convex rib 8-2, the first positioning convex rib 8-2 is arranged above the hole convex ring 8-5, the outer side wall of the joint of the lower end of the needle cylinder 4 is provided with a second positioning convex rib 4-6, and when the needle cylinder 4 is inserted into the needle seat positioning sleeve 8, the second positioning convex rib 4-6 passes through the first positioning convex rib 8-2 to be limited between the first positioning convex rib 8-2 and the hole convex ring 8-5. The lower end connection part of the needle cylinder 4 is in contact connection with the top end port of the needle seat positioning sleeve 8, so that the stability between the needle cylinder 4 and the needle seat positioning sleeve 8 is further ensured. The needle seat positioning sleeve 8 and the needle cylinder 4 are simply assembled, and are tightly matched, so that the needle seat positioning sleeve cannot shake easily.
Example 3
Embodiment 3 has substantially the same features as embodiment 2, except that the inner wall of the needle seat positioning sleeve 8 is provided with an internal thread 8-6, the internal thread 8-6 is arranged above the hole inner convex ring 8-5, the outer side wall of the joint of the lower end of the needle cylinder 4 is provided with an external thread 4-7, and the needle cylinder 4 is in threaded connection with the internal thread 8-6 of the needle seat positioning sleeve 8 through the external thread 4-7.
Claims (8)
1. The spring automatic retraction type safety injector comprises a push rod (1), a needle cylinder (4), a needle seat (6), a spring (7), a spring sleeve (9) and a needle body (10), wherein the push rod (1) stretches into the needle cylinder (4), the lower end part of the needle cylinder (4) is connected with the spring sleeve (9), the needle seat (6) is mounted in the spring sleeve (9) in a limiting way with the spring (7), the top end of the needle seat (6) stretches into the needle cylinder (4), and the bottom end of the needle seat stretches out of the spring sleeve (9) and is fixedly connected with the needle body (10); the method is characterized in that: a mounting hole (9-1), a needle seat positioning bending hole (9-3) and a spring positioning hole (9-4) which are communicated in sequence and have gradually reduced pipe diameters are arranged in the spring sleeve (9), a needle seat positioning piece (6-4) is arranged on the needle seat (6), and an in-hole convex ring (8-5) for limiting the needle seat positioning piece (6-4) is arranged on the inner wall of the mounting hole (9-1); when the needle body (10) is retracted, the push rod (1) pushes the needle seat (6) to move downwards, the needle seat (6) drives the positioning end of the needle seat positioning piece (6-4) to move from the mounting hole (9-1) to the needle seat positioning bending hole (9-3), the compression force of the spring (7) is released and pushes the needle seat (6) to move into the needle cylinder (4), and the needle body (10) is brought into the spring sleeve (9) by the needle seat (6) and is surrounded by the spring (7).
2. The spring-automatically retracting safety syringe of claim 1, wherein: the needle seat (6) is an integral needle seat, the needle seat (6) comprises a needle seat rod (6-6), a needle seat positioning seat (6-5) and a needle seat sealing part (6-3), the needle seat sealing part (6-3) and the needle seat positioning seat (6-5) are both arranged on the needle seat rod (6-6), the needle seat positioning seat (6-5) is arranged below the needle seat sealing part (6-3), a sealing groove (6-3.1) is arranged on the needle seat sealing part (6-3), a sealing ring (5) is arranged in the sealing groove (6-3.1), the needle seat sealing part (6-3) stretches into the needle cylinder (4), needle seat positioning pieces (6-4) with a plurality of needle seat positioning pieces are integrally formed on the needle seat positioning seat (6-5), a medicament channel (6-2) for a medicament to pass through is arranged on the needle seat rod (6-6), and a needle body adhesion hole (6-1) for installing a needle body (10) is arranged at the lower end part of the needle seat rod (6-6).
3. The spring-automatically retracting safety syringe of claim 1, wherein: the upper end face of the needle seat positioning piece (6-4) is a needle seat positioning end face (6-4.1), the needle seat positioning end face (6-4.1) is positioned on the lower end face of the convex ring (8-5) in the hole, a guide arc-shaped face (9-3.1) is arranged at the port of the needle seat positioning bending hole (9-3), the lower end face of the positioning end of the needle seat positioning piece (6-4) is an inclined face (6-4.2), the needle seat positioning piece (6-4) enters the needle seat positioning bending hole (9-3) along the guide arc-shaped face (9-3.1) through the inclined face (6-4.2), and the positioning end of the needle seat positioning piece (6-4) is inwards bent in the needle seat positioning bending hole (9-3).
4. A spring-automatically retracting safety syringe according to any one of claims 1 to 3, wherein: the mounting hole (9-1) is internally provided with a needle seat positioning sleeve (8), the hole inner convex ring (8-5) is arranged on the inner wall of the needle seat positioning sleeve (8), the outer side wall of the lower end part of the needle seat positioning sleeve (8) is provided with a first positioning sleeve convex rib (8-3), the mounting hole (9-1) is a countersunk hole, the small hole end opening of the mounting hole (9-1) is provided with a second positioning sleeve convex rib (9-2) protruding inwards, and when the needle seat positioning sleeve (8) is arranged in the mounting hole (9-1), the first positioning sleeve convex rib (8-3) passes over the second positioning sleeve convex rib (9-2) to position the needle seat positioning sleeve (8) on the spring sleeve (9).
5. The spring-automatically retracting safety syringe of claim 4, wherein: the needle seat positioning sleeve (8) is further provided with a first positioning convex rib (8-2), the first positioning convex rib (8-2) is arranged above the hole inner convex ring (8-5), the outer side wall of the joint of the lower end of the needle cylinder (4) is provided with a second positioning convex rib (4-6), and when the needle cylinder (4) is inserted into the needle seat positioning sleeve (8), the second positioning convex rib (4-6) passes through the first positioning convex rib (8-2) to be limited between the first positioning convex rib (8-2) and the hole inner convex ring (8-5).
6. The spring-automatically retracting safety syringe of claim 4, wherein: an inner thread (8-6) is arranged on the inner wall of the needle seat positioning sleeve (8), the inner thread (8-6) is arranged above the hole inner convex ring (8-5), an outer thread (4-7) is arranged on the outer side wall of the joint of the lower end of the needle cylinder (4), and the needle cylinder (4) is in threaded connection with the inner thread (8-6) of the needle seat positioning sleeve (8) through the outer thread (4-7).
7. The spring auto-retracting safety syringe of claim 1 or 2 or 3 or 5 or 6, wherein: the push rod (1) is a combined push rod, the push rod (1) comprises a push rod handle part (1-1), a hollow tube (1-2) and a rubber plug (1-3), the rubber plug (1-3) is fixed at the bottom end of the hollow tube (1-2), a first convex rib (1-2.1) and a second convex rib (1-2.2) are arranged at the inner end of the hollow tube (1-2), a clamping groove (1-2.3) is formed between the first convex rib (1-2.1) and the second convex rib (1-2.2), and a protruding part (1-1.1) is arranged at the lower end part of the push rod handle part (1-1); the push rod handle part (1-1) is clamped in the clamping groove (1-2.3) of the hollow tube (1-2) through the bulge part (1-1.1), and when the medicament is extracted and pushed, the push rod handle part (1-1) and the hollow tube (1-2) are lifted synchronously; when the needle body (10) is retracted, the protruding part (1-1.1) of the push rod handle part (1-1) passes over the second protruding rib (1-2.2) and is retracted into the hollow tube (1-2).
8. The spring-automatically retracting safety syringe of claim 7, wherein: the push rod handle part (1-1) is an integrated handle part, the push rod handle part (1-1) comprises a handle (1-1.2), an upper push rod (1-1.3) and a guide cone head (1-1.4), the upper push rod (1-1.3) is arranged between the handle (1-1.2) and the guide cone head (1-1.4), and the protruding part (1-1.1) is arranged on the guide cone head (1-1.4); the needle cylinder (4) is an integrated needle cylinder, the needle cylinder (4) comprises a cylinder body (4-1) and an operating handle (4-2), the operating handle (4-2) is arranged at the top end of the cylinder body (4-1), and a groove (4-2.1) for hiding the handle (1-1.2) is formed in the operating handle (4-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210727530.0A CN115282402B (en) | 2022-06-24 | 2022-06-24 | Spring automatic retraction type safety syringe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210727530.0A CN115282402B (en) | 2022-06-24 | 2022-06-24 | Spring automatic retraction type safety syringe |
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| Publication Number | Publication Date |
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| CN115282402B true CN115282402B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210727530.0A Active CN115282402B (en) | 2022-06-24 | 2022-06-24 | Spring automatic retraction type safety syringe |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2623253Y (en) * | 2003-06-18 | 2004-07-07 | 孙诗恒 | Disposable syringe with automatically retractable syringe needle |
| CN1635918A (en) * | 2000-01-04 | 2005-07-06 | 贝克顿迪肯森公司 | Retractable needle syringe |
| CN2892119Y (en) * | 2006-04-05 | 2007-04-25 | 刘文杰 | Exchangeable needle head structure for needle revertive back type injector and needle head revertive back type injector |
| CN201791197U (en) * | 2010-09-15 | 2011-04-13 | 徐昊华 | Disposable automatic retracting safety syringe with replaceable syringe needles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008522673A (en) * | 2004-12-14 | 2008-07-03 | グローバル メディセーフ ホールディングス リミテッド | Extendable automatic retractable medical syringe |
| US8951228B2 (en) * | 2009-03-12 | 2015-02-10 | Stat Medical Devices, Inc. | IV infusion system device having retractable needle and method of making and using the same |
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2022
- 2022-06-24 CN CN202210727530.0A patent/CN115282402B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635918A (en) * | 2000-01-04 | 2005-07-06 | 贝克顿迪肯森公司 | Retractable needle syringe |
| CN2623253Y (en) * | 2003-06-18 | 2004-07-07 | 孙诗恒 | Disposable syringe with automatically retractable syringe needle |
| CN2892119Y (en) * | 2006-04-05 | 2007-04-25 | 刘文杰 | Exchangeable needle head structure for needle revertive back type injector and needle head revertive back type injector |
| CN201791197U (en) * | 2010-09-15 | 2011-04-13 | 徐昊华 | Disposable automatic retracting safety syringe with replaceable syringe needles |
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| CN115282402A (en) | 2022-11-04 |
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