JP3107899U - Safety needle barrel retraction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly safe injection needle retraction structure of an injection needle cylinder that can retreat an injection needle with a simple structure.
SOLUTION: A cylinder 10 having a space of a different diameter, a connection base 20 accommodated in the cylinder 10 and joined to an injection needle 50, and a plunger 30 connectable to the connection base 20 are provided, and the plunger 30 is advanced. After the positioning of the connection base 20 and the cylinder 10 is released, the plunger 30 is retracted, and the injection needle 50 is drawn together with the connection base 20 into the cylinder 10 to store the injection needle 50 safely.
[Selection] Figure 4

Description

  The present invention relates to an injection needle retraction structure of an injection needle barrel, and in particular, it is possible to store liquid inside the injection needle barrel, and at the same time, after the injection needle barrel completely injects the stored liquid, the plunger of the injection needle barrel The injection needle is retracted into the hollow body of the cylinder by utilizing the above, and the injection needle retracting structure of the safety injection cylinder that can be safely stored.

  The general configuration of the injection needle cylinder includes a hollow cylinder and a plunger disposed in the cylinder. Among them, one end of the cylinder protrudes and can be connected to the injection needle. Then, by pushing the plunger, the liquid (for example, medicine) stored in the cylinder can be injected through the injection needle.

  A general syringe barrel does not have a function of storing a syringe needle. Therefore, it was necessary to remove the injection needle after covering the injection needle with the needle cover. As described above, since the needle cover must be covered with the injection needle, there is a problem that a dangerous situation that the needle is stuck by carelessness during the operation easily occurs.

In order to solve the problem of disposal of the used needle after use, the design standard is to pull the connecting base and the needle all together into the cylinder in the known technology, but the specific technology (means and The structure is all different.
That is, a technique is known in which the plunger is pushed out to the bottom surface of the connection base to couple the plunger and the connection base, and then the plunger is directly pulled outward to pull the connection base and the needle into the cylinder. In the known technology, no operation for releasing the positioning operation of the connection base is found.

  The first object of the present invention is to use the syringe needle by retracting the connection base and the syringe needle and pulling them into the cylinder while the plunger is in the retracting operation mainly after using the syringe barrel. Another object of the present invention is to provide a safety needle retraction structure for a safety syringe barrel that can avoid being stabbed into other related parties or objects.

  The second object of the present invention is to provide a connecting base having an elastic lever piece, one end is joined to an injection needle, and the other end is in contact with a stopper ring formed on the inner peripheral surface of the cylinder to form a positioning structure. When operating the injection needle, if the plunger is pushed forward and moved to a point approaching the end point position, it comes into contact with the elastic lever piece and moves it. It is to provide a safety needle barrel retracting structure that can be released.

  The third object of the present invention is that when the plunger moves in the forward direction to the end point position, it can exert a locking action with the connection base, so that when the plunger is pulled “backward”, the connection base and It is an object of the present invention to provide a safety needle retraction structure for a safety syringe barrel that can achieve the safety objective that the injection needle can be collectively pulled into the cylinder and the injection needle can be safely stored after use.

  In order to achieve the above-described problems, the first device of the present application is configured such that a syringe barrel is configured by arranging a reciprocating plunger in the cylinder, and the syringe needle can be retracted into the cylinder after the syringe needle is used. A safety needle barrel retracting structure, wherein a connecting base is disposed in the cylinder, and the connecting base is arranged at one end approaching the end point position of the plunger corresponding to the forward direction of the plunger. A protruding small tube that can be joined to the injection needle and has a flow path in the inner axial direction is formed, and the inner peripheral surface of the cylinder can be locked to the fitting portion formed at the other end of the connection base A plurality of elastic lever pieces are provided, and when the plunger is pushed out, at the location approaching the end point position, the tip of the plunger enters the fitting portion of the connection base to pry open each elastic lever piece. To release the locking state between the other end of each elastic lever piece and the inner peripheral surface of the cylinder, connect the plunger to the coupling base, and retract the injection needle connected to the coupling base when the plunger is retracted. It is characterized in that it can be moved back to the inside of the cylinder.

  The second device of the present application is the above-described safety needle barrel retracting structure according to the first device, wherein the inside of the cylinder is a hollow with different diameters having multi-stage diameters, and a stopper ring provided therein. Thus, the connection base accommodated in the cylinder is brought into contact with and positioned.

  According to a third device of the present application, in the injection needle retraction structure of the safety syringe barrel according to the first device described above, the coupling base has a hollow structure at the fitting portion, and each elastic lever piece is arranged in an annular shape. It is characterized by this.

  According to a fourth device of the present application, in the injection needle retraction structure of the safety syringe needle according to the first device described above, the fitting portion includes a plurality of fixed piece bodies and a plurality of elastic lever pieces, A connecting portion is installed between adjacent fixed pieces.

  According to a fifth device of the present application, in the injection needle retraction structure of the safety syringe needle according to the first device described above, each elastic lever piece has a flange formed at one end of the inner wall, and when the tip of the plunger contacts the flange Further, each elastic lever piece is configured to be able to exhibit this function.

  The sixth device of the present application is the above-described safety needle barrel retracting structure according to the first device, wherein the plunger is provided with a non-returning cylinder at the tip of the plunger, and the plunger moves forward so that the coupling base is fitted. When entering the joint part, the one end of the elastic lever piece is formed in a locked state, and the other end of the elastic lever piece is flipped to release the locked positioning state between the coupling base and the cylinder. It is characterized by this.

  In the seventh device of the present application, in the injection needle retraction structure of the safety syringe barrel according to the first device described above, an annular protrusion is provided at the tip of the plunger, and the plunger moves forward to the end point position. When the annular protrusion engages with the other end of the elastic lever piece, the coupling base and the plunger are coupled, and when the plunger is retracted, the coupling base is also retracted into the cylinder hollow body. is there.

In the present invention, the cylinder is formed in a hollow shape having a multi-stage diameter, and a stopper ring is formed on the inner peripheral surface thereof. The connection base is arranged inside the cylinder, a protruding small tube for joining the injection needle is provided at one end of the connection base, and a hollow body structure fitting portion is formed at the other end. In addition, a plurality of elastic lever pieces having a lever action are provided on the circumferential surface of the fitting portion, and the plurality of elastic lever pieces are in contact with the stopper ring in the cylinder to form a positioning state. . In addition, with a simple configuration in which an annular protrusion is provided at one end of the plunger, the plunger is pushed forward to enter the fitting portion of the connection base, and the elastic lever piece is repelled to exert a lever action. After releasing the locking state between the elastic lever piece and the outer cylinder of the cylindrical body, the connecting base and the injection needle can be simultaneously retracted and stored in the cylinder simply by retracting the plunger.
Further, according to the present invention, it is not necessary to drop the connection base and the needle into the cylinder by the repulsive force of the spring, and it is not necessary to release the connection state between the connection base and the cylinder by the rotation method.
Moreover, the stability of the connection base during normal use is good due to the positioning action between the connection base and the cylinder of the present invention. When the present invention is compared with the prior art, it has not only a different structural form, but also has a useful effect in terms of use that the disposal operation of the injection needle is simple.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 shows a safety needle cylinder according to the present invention, which includes a cylinder 10, a connecting base 20, and a plunger 30.

  As shown in FIG. 2, the cylinder 10 is a hollow column having both ends penetrating, and a hollow with a different diameter having a multistage structure is formed at a position close to the tip 12 inside thereof. A stopper ring 14 is formed on the peripheral surface. A cylinder blade 18 having a relatively large diameter is provided at the end 16 of the cylinder 10.

As shown in FIG. 3, the connection base 20 includes a protruding small tube 22 and a fitting portion 24 having a hollow body structure. The protruding small tube 22 forms a tube column for coupling with an injection needle (needle), and a flow channel 26 is provided through the inner axial direction.
The fitting portion 24 includes a plurality of elastic lever pieces 28. The elastic lever pieces 28 are arranged on the circumferential surface of the fitting portion 24. A connection 281 is provided between each elastic lever piece 28 and the adjacent fixed piece body 27, whereby each elastic lever piece 28 is positioned and has a function of being opened. A locking flange 282 extending outward is formed at the end of each elastic lever piece 28, and a flange 284 is formed on the surface side of the inner wall surface close to the protruding small tube 22.

  Further, as shown in FIG. 1, the plunger 30 is a long columnar body, and a flange-like annular protrusion 34 and a check cylinder 35 are formed at the end of the plunger 30.

  FIG. 4 shows a cross section of a safety needle cylinder in which each member is assembled. The connection base 20 is disposed inside the cylinder 10, and a locking flange 282 at one end of each elastic lever piece 28 provided in the fitting portion 24 abuts against a stopper ring 14 formed on the inner peripheral surface of the cylinder 10. Is positioned. The injection needle 50 is connected to the protruding small tube 22 of the connection base 20.

  The plunger 30 is inserted into the cylinder 10 so as to be reciprocally movable. The piston ring 32 that is externally mounted on the protruding small tube 22 of the connection base 20 is in close contact with and in contact with the inner peripheral surface of the cylinder 10. The connection base 20 that is locked to the stopper ring 14 and positioned in the cylinder 10 presses the piston ring 32 and exhibits the function of positioning the connection base 20 in the axial direction. Helps to strengthen the liquid leakage prevention effect.

  Next, the method of use will be described. As shown in FIG. 5, after the purpose of using the syringe needle is achieved, the user pushes the plunger 30 further forward so that one end of the plunger 30 enters the fitting portion 24 of the connection base 20. To do. The end of the plunger 30 is displaced to the position of the flange 284 on the inner wall surface of each elastic lever piece 28 to open each elastic lever piece 28. Then, the locking flange 282 at one end of each elastic lever piece 28 starts to separate from the stopper ring 14.

Further, as shown in FIG. 6, when the plunger 30 is continuously pushed to the end point position, the annular protrusion 34 provided at the tip of the plunger 30 opens the flange 284 of the elastic lever piece 28 and the flange 284 of the elastic lever piece 28 is moved. It straddles the annular protrusion 34 of the plunger 30 and stops at the non-return cylinder 35, and the contact positioning state between the locking flange 282 of the elastic lever piece 28 and the stopper ring 14 in the cylinder is released.
At the same time, since the flange 284 of the elastic lever piece 28 is connected to the annular protrusion 34 of the plunger 30, when the plunger 30 is pulled back, the connection base 20 and the plunger 30 retreat integrally.

  After the distal end portion of the plunger 30 is coupled to the connection base 20 as shown in FIG. 7, when the plunger 30 is pulled back “backward”, the injection needle 50 integrated with the connection base 20 is driven by the plunger 30 together with the cylinder. Retreat inside 10 Thereby, the injection needle 50 can be safely stored in the cylinder 10.

FIG. 8 shows a connection base 20 applicable to a syringe needle barrel according to another embodiment.
One end of the connection base 20 is formed with a protruding small tube 22 that can be connected to a cannula, and a channel 26 penetrating in the axial direction is provided inside the protruding small tube 22. A fitting part 24 having a hollow body structure is formed at another end of the connection base 20, and a plurality of elastic lever pieces 28 are provided on the circumferential surface of the fitting part 24. And a fixed piece body 27 adjacent to each other, a connecting portion 281 is provided. In addition, a locking flange 282 is formed at the end of each elastic lever piece 28, and a flange 284 is formed at the other end.

  As shown in FIG. 9, the connecting base 20 is mounted in the cylinder 10 by positioning it in contact with the stopper ring 14 by the locking flange 282 of the elastic lever piece 28. When the plunger 30 is pushed until it approaches the end point position, the annular protrusion 34 at the distal end of the plunger 30 not only opens the flange 284 of the elastic lever piece 28 but also the flange 284 of the elastic lever piece 28 moves the flange 284 of the plunger 30. It straddles the annular protrusion 34 and stops at the position where the non-return cylinder 35 is formed to release the contact positioning state between the locking flange 282 of the elastic lever piece 28 and the stopper ring 14 in the cylinder, and at the same time, the elastic lever Since the flange 284 of the piece 28 is connected to the annular protrusion 34 of the plunger 30, the connecting base 20 and the injection needle 50 can be drawn together into the cylinder 10 by pulling the plunger 30 “backward”.

Exploded view of the safety syringe barrel according to the present invention Cross section of cylinder Cross-sectional perspective view of connection base Cross section of safety syringe barrel Sectional view of the safety syringe barrel when the latching state between the elastic lever piece and the cylinder is released Sectional view of the safety syringe barrel when the elastic lever piece and the coupling base are fitted Sectional view of the safety syringe barrel when the needle is pulled back inside Sectional drawing of the connection base which concerns on another Example Sectional drawing of the safety injection cylinder when the elastic lever piece of another Example and the connection base are fitted.

Explanation of symbols

10: Cylinder 12: Tip 14: Stopper ring 16: End 18: Cylindrical blade 20: Connection base 22: Protruding small tube 24: Fitting portion 26: Channel 27: Fixed piece body 28: Elastic lever piece 281: Connection portion 282: Locking flange 284: Flange 30: Plunger 32: Piston ring 34: Annular projection 35: Non-return cylinder 50: Injection needle

Claims (7)

A syringe barrel is constructed by disposing a plunger that can reciprocate in a cylinder, and a safety needle barrel retracting structure for a safety syringe barrel that can retract the syringe needle into the cylinder after use of the syringe needle,
A connecting base is disposed in the cylinder,
The connection base is formed with a protruding small tube that can be joined to an injection needle at one end that approaches the end point position of the plunger corresponding to the advance direction of the plunger, and that has a flow path in the internal axial direction. The fitting portion formed at the other end of the base is provided with a plurality of elastic lever pieces that can be locked with the inner peripheral surface of the cylinder,
When the plunger is pushed out, the other end of each elastic lever piece and the inner circumferential surface of the cylinder are formed by the tip of the plunger entering the fitting portion of the coupling base and prying open each elastic lever piece at a location close to the end point position. And the plunger is coupled to the coupling base,
The syringe needle connected to the coupling base when the plunger is retracted is configured to be retractable to the inside of the cylinder by following the retract of the plunger.
The needle retraction structure of the safety syringe barrel.   The inside of the cylinder is a hollow with different diameters having multi-stage diameters, and a connecting base housed in the cylinder is abutted and positioned by a stopper ring provided inside the cylinder. The injection needle retraction structure of the safety injection cylinder according to Item 1.   2. The injection needle retraction structure of a safety injection needle cylinder according to claim 1, wherein the coupling base has a hollow structure and the elastic lever pieces are arranged in an annular shape.   The fitting portion has a plurality of fixed piece bodies and a plurality of elastic lever pieces, and a connecting portion is installed between each elastic lever piece and an adjacent fixed piece body. The injection needle retraction structure of the described safety injection cylinder.   2. Each elastic lever piece is formed with a flange at one end of an inner wall, and each elastic lever piece is configured to exhibit this function when the tip of the plunger contacts the flange. Needle retraction structure of the safety syringe barrel.   A non-return cylinder is provided at the tip of the plunger, and when the plunger moves forward and enters the fitting portion of the connection base, it forms a locking state with one end of the elastic lever piece, and the elastic lever piece 2. The injection needle retraction structure for a safety injection cylinder according to claim 1, wherein the other end of the injection base is bounced so that the locked positioning state between the connection base and the cylinder can be released.   An annular protrusion is provided at the tip of the plunger, and when the plunger moves forward to the end point position, the annular protrusion engages with the other end of the elastic lever piece, thereby connecting the connection base and the plunger. 2. The injection needle retraction structure for a safety injection cylinder according to claim 1, wherein the injection base retraction structure is combined and the connection base is also retracted into the hollow cylinder body when the plunger is retracted.

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