JP2925729B2 - Syringe with automatically retracting needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a medical syringe, for example, a hollow needle.
The present invention generally relates to a device for injecting a substance used for medical treatment into a body through an intramuscular blood vessel, a subcutaneous blood vessel, and a venous blood vessel.

This injection operation is performed by the medical staff or the patient himself, but the injection operation performed by the patient himself is called self-injection.

Today, so-called single-use syringes are common. These are sold sterile in sealed containers and will not be reused to prevent any accidental infection from one patient to another. However, such syringes cannot prevent accidental punctures by medical personnel and, indeed, cannot be re-used unless the user voluntarily breaks the syringe after use.

European Patent Application 0,307,367 describes a syringe with an automatically retracting needle.

Such a syringe includes a main body having a means for supporting an injection needle at one end, a plunger movable within the main body, a protective cylinder in which the main body slides, and a spring provided between the protective cylinder and the main body. Is provided. Further, the main body is provided with a protection cylinder catching means, which includes first and second shoulders provided on the outer wall of the main body and at least one of the protection cylinders. A flexible finger portion.

The finger contacts the first shoulder to move the body to the first position.
A first position of the body that blocks in the direction is formed, compressing the spring, and projecting the needle from the protective tube at the first position.

Then, the finger portion is brought into contact with the second shoulder to form a second block position for blocking the main body in the same direction. On this occasion,
The spring is at least partially released and the needle retracts into the protective tube in this second position.

The movement from the first position to the second position releases the finger of the first shoulder in the final step of the movement of the plunger by cooperation of the plunger and the first flexible finger, whereby the main body is moved. By the spring force until it blocks to the second position,
The main unit retracts into the protective cylinder.

The above structure is partially satisfactory. This is because at least the needle can be retracted into the protective cylinder.

However, this syringe is extremely complicated to manufacture and disadvantageous in price. Furthermore, the reliability is not sufficient.

In fact, the plunger does not cooperate directly with the block finger but rather operates via an additional piece of resilient ring, so that the unreachable person may be deformed and reused.

Furthermore, according to the above cited reference, the needle cannot be returned by a very small cylindrical hole.

That is, the hole is in an inclined state in advance,
Once retreated into the cylinder, it cannot return. Such a configuration has problems in the following points.

That is, the syringe cannot change the needle. For the connecting end of these needles cannot be displaced through the bore of the barrel.

In fact, it is convenient for the medical staff to be able to attach the needle of his or her choice to the syringe during actual surgery or the like.

For example, in order to aspirate a liquid into a syringe, use a large-diameter needle,
And it is necessary to attach a small diameter needle for the purpose of injection.

The main object of the present invention is to provide a new syringe that can solve this problem.

The syringe according to the invention is therefore of the type generally known in the above-mentioned documents. However, it comprises at least a second bent finger and a third shoulder provided in the direction opposite to the first finger and the two first shoulders, respectively, which are respectively provided on the sheath and the body wall. And holds the body in the barrel in the second locked position. Note that the second locking position is in a direction opposite to the first direction.

Thus, the second finger and the third shoulder seal the body in the sheath and prevent the needle from coming out. The operation is independent of the caliber of the outlet of the sheath.

According to the present invention, it is desirable that the lower part of the main body is provided with a needle mounting connecting part, and the lower part of the sheath is provided with an opening through which the connecting end can be inserted.

Preferably, at least some or all of the fingers have flexibility and are integrally formed with the sheath. For example, it is made of a plastic material such as polypropylene, polyethylene, and polystyrene. Of course, the sheath itself can be made of one piece or a plurality of assemblable parts to make the sheath more simple.

More preferably, at least some or all of the fingers are protected on their outer surface by a cylindrical wall separate from the sheath. The wall is attached to or formed integrally with the sheath. According to one embodiment, the wall is formed by the sheath itself (or a part of the sheath) and the fingers are formed inside the sheath.

According to the first embodiment, the finger portion can be formed from a portion cut out from the wall of the sheath body with a certain thickness, and the cutout portion is provided at an opposing position in a slot formed in the wall. The shoulders of the body are preferably substantially square edges (coll
ars) or lines, formed by the front of
It is arranged by molding at an appropriate position on a cylindrical body.

According to the second embodiment, a needle holding chuck is provided, and at least a certain finger is provided with a second, that is, a 'reverse locking' finger at an end in the sheath. In the first position, the above-mentioned chuck can be surrounded, released towards the second position and locked in the same position. Preferably, the needle holding chuck is provided with a beveled point having low resistance to breaking when a predetermined pressure or more is applied.

According to the third embodiment, the first and second finger portions are provided inside the mounting cylinder that forms the base end of the sheath.

One end of the spring is preferably fitted in a reduced diameter portion provided in the main body, to which a needle or a needle holding connection end is fixed, and the needle is separated from the main body when re-use is attempted. Can be done.

The plunger has a part which can be brought into direct contact with the first locking finger in the final stroke of the injection operation, which part is formed as an enlarged part of the plunger rod or a skirt part of the plunger.

Other features and advantages of the present invention will become apparent from the description of several preferred embodiments of the invention, as illustrated in the accompanying drawings.

In the drawing, FIG. 1 is a partial view of the syringe according to the first embodiment of the present invention taken along line II of FIG. 2 in a use state.

 FIG. 2 is a side view of the syringe.

FIG. 3 is a cross-sectional view of the syringe after the main body is retracted into the sheath.

FIG. 4 is a partial cross-sectional view of the distal end of the syringe according to the second embodiment in a use state.

FIG. 5 is a view similar to FIG. 4 in a non-use state.

FIG. 6 is a drawing similar to FIG. 5, showing a modified example in which the method of attaching the needle is changed.

FIG. 7 is a partial view of the proximal end of the main body of the syringe according to the third embodiment, taken along line VII-VII in FIG.

 FIG. 8 is a plan view of the same embodiment.

 FIG. 9 is a sectional view along IX-IX in FIG.

1 to 3, the syringe set comprises a substantially cylindrical body 1 having an open end and a partially closed end or bottom 3.

Connection ends 4, 5 are attached to the bottom portion 3, and these connection ends 4, 5 are connected to the cylindrical portion 4 and the cylindrical portion 4, and together with the tapered mounting piece 7, a normal needle is attached. And a tapered portion 5 serving as a mounting member to which the mounting member 6 can be mounted. Connection
A hole 8 is provided in each of the holes 4 and 5, and the hole 8 enables communication between the inside of the main body 9 and the hole of the needle 6.

Through the opening end 2 of the main body 1, the sealing member 1 is inserted into the main body 1.
0, a plunger 13 having a cross-shaped rod 11 and a pressing piece 12 is inserted, and the plunger 13 can slide freely in the main body 1. A peripheral hem 22 connected to the pressing piece 12 protects a portion of the main body 1.

A substantially cylindrical sheath 14 is slidably mounted along the body 1. The sheath 14 has at one end a hole 15 of sufficient size to narrow the wall and allow the needle mounting member 5 to pass through.
Is formed. The sheath 14 has a shape serving as a base for supporting one end of the compression spring 17, and the other end of the spring 17 is supported by the shoulder 16 of the main body 1 at the end 3. When compressed, the spring 17
Are held around the periphery 4 of the connecting portions 4 and 5.

The sheath 14 has a gripping flange 18 at the other end.

The peripheral wall of the sheath 14 is provided with two rectangular slots spaced in the circumferential direction, some of which are two elastically opposing opposing directions. It is formed from tongues or fingers 19,20.

The first finger 19 is a first annular shoulder provided on the outer peripheral wall of the main body 1.
In cooperation with 21, a first locking of the body 1 in the sheath 14 is performed. The first lock is in the position shown in FIGS. 1 and 2, the needle can be used, and the spring 17 is in a compressed state. When the plunger 13 is pushed into the main body 1, the finger 19 expands due to the action of the skirt 22. The spring 17 is then released, causing the sheath 14 to move away from the body 1 to the second locking position. In the second locked position, the fingers 19 cooperate with a second annular shoulder 23 (FIG. 3) located at the lower part of the body 1.

In this way, the finger 19 and the shoulder 23 can prevent the main body 1 and the needle 6 from being pulled out of the sheath 14 covering them.

The second finger 20 acting in the opposite direction to the finger 19 is
Is prevented from coming out of the sheath 14. That is, the width of the hole 15 alone is not enough to prevent the above. In order to provide sufficient protection, the second finger 20 is connected to the third shoulder 24 (shoulder
Confront in the opposite direction to 21 and 23). The third shoulder 24 is formed by the end of the support 16 of the spring 17. In this way, after the injection, the main body 1 is held at the position shown in FIG.
Can not be taken out. Of course, the completely conventional plunger 13 can be removed from the body 1 (not shown in FIG. 3).

The fingers 19, 20 preferably consist of bendable tongues,
The tongue piece has a constant thickness, forms a one-way locking ridge in one direction inside the sheath, and forms a slope (ra) in the other direction.
mp), and these tongues coincide with the outer cylindrical wall of the sheath 14 in the normal state. Thus, it is difficult to touch the finger portions 19 and 20 from the outside, and
Inadvertent handling by medical personnel can be completely prevented. Of course, to place the syringe in the use position,
Must be able to be temporarily released from the outside by an assembly device. That is, the shoulder 24 and any other shoulder facing in the same direction, for example, the shoulder 25 of FIG. 1, may be positioned along the lower stroke of the body below the level of the finger 20. Through the part.

If, after the first injection, an individual attempts to reuse by any means, a protective ring 26 may be attached to the end of the device by gluing, welding or otherwise securing the sheath 14 to the finger. It is also possible to coat 19,20. This makes it impossible for an individual to touch the fingers 19, 20 while the functions of the fingers 19, 20 can be completely ensured and separated if necessary. That is, the finger portion 19 becomes immobilized at the stroke end of the plunger to the syringe, and the finger portion 20 retreats from the main body to the sheath after the disabled state.

This protective ring 26 can preferably be made airtight, for example by using an airtight protective cap 27, and, like some insulin syringes, can be sterilized without having to individually package the syringes. can do.

Preferably, a recess 27 can be provided in the body, which allows the finger 20 when the syringe is in the use position.
Can be in a free state as in the case of the finger portion 19. That is, they are not in any pressed state. Thus, the integrity and resilience of the two opposing fingers can be maintained while the syringe is stored in the assembled state.

The second embodiment shown in FIGS. 4 to 6 is mainly characterized by the use of the second reverse lock locking finger portion with respect to the first embodiment.

In this embodiment, the syringe is likewise a body 1, a plunger 13 having a sliding close contact 10, an outer sliding sheath 14, a sheath
A spring 17 is held between the end of the body 14 and a shoulder 16 to the front of the body 1.

The main body 1 further has a front portion extending as a substantially cylindrical needle holding chuck 30 having a hole.
Has a length equal to the length of the needle 6 representing several mm. The chuck 30 has a reduced-diameter portion 31 at the base on the syringe side.

The sheath 14 has at its end a radially extending 6 around a hole 15.
It has a number of axial tabs 32 which attach radially inwardly directed fingers 33 to its inner ends.

Before use, the body 1 of the syringe is completely pushed into the sheath (FIG. 4). The needle holding chuck 30 is then glued to the end of the hole, while the tab 32 surrounds and supports the chuck 30. That is, the protruding finger portion 33 of the tab is fitted into the position of the reduced diameter portion 31 without difficulty. The spring 17 is coiled,
The syringe is ready for use.

The operation of the syringe is the same as in Example 1 with regard to the disabling. However, during the subsequent operation of retracting the body 1 into the sheath 14, the flexible tab 32 separates around the chuck 30 by the action of the finger 33, and then due to its elasticity at its stroke end ( 5) Take the new position again, at which point the body 1 of the syringe is locked on the shoulder 32 formed by the end of the chuck 30, and the finger 33 supports the body 1. The shoulder portion 34 and the finger portion 33 are complementarily formed in an uneven relationship, and the locking force is enhanced by increasing the pressing force. Further, when the pressing piece is pressed, the weakened reduced diameter portion 31 is broken, and the reuse is completely impossible.

FIGS. 4 and 5 show the needles which are fixedly adhered. In this embodiment, each of the connecting ends 7 (FIG. 6) is used.
The needle holding chuck 30 can be formed by the mounting piece 5 for the replaceable needle 6 having the following.

The syringe assembler requires a device that temporarily moves and separates the tab 32 to form an initial mounting passage for the chuck 30.

Also in the first to third embodiments, a weakened reduced diameter portion similar to the reduced diameter portion of the chuck 30 can be provided at the base of the connecting portions 4 and 5.

In this case, the last winding of the spring 17 can be firmly supported by the reduced diameter portion.

Thus, even if the sheath is cut open for re-use of the syringe and its needle, an attempt to remove the spring 17 from the reduced-resistance reduced diameter portion would break the syringe and cause the syringe body to break. The connection is separated. Therefore,
Reuse of the needle and / or syringe is not possible.

According to the embodiment shown in FIGS.
4 has been replaced by fingers 19 ', 20' held by a substantially cylindrical sleeve. In this case, the end 41 of the sheath 14 is supported in the end of the sheath 40 by appropriate means, for example, bonding, ultrasonic sealing, heat welding, or the like. Sheath body 40, on the other hand, supports gripping flange 18.

The finger portions 19 ′ and 20 ′ are provided inside the sheath 40, and are formed, for example, by integral molding with the sheath 40.

The finger 19 'is oriented towards the bottom and, for the use position, abuts and cooperates with an end 21' formed by the upper end of the body position. On the other hand, the same finger 19 ′ abuts and cooperates with a second shoulder (not shown) located below the main body 1 for the non-use position.

The disabled state is activated by cooperation with the inflatable portion 42 provided at the end of the plunger rod 13, which is displaced at the stroke end of the finger 19 ′, and supported by the end 21 ′ on the other hand.

The finger 20 'is located as a four-piece and opposite the finger 19' and cooperates with a suitable reverse locking shoulder located on the body 1 after the syringe body has been retracted.

 This embodiment is more effective in terms of assembly and safety.

In fact, a temporary device for moving and separating the finger is not required during assembly. The body 1 is completely fitted into the sheath 14, the assembly is fitted with a sheath 40, and the plunger is mounted in place.

The main body 1 according to the present embodiment has a very simple structure. That is, the cylindrical body supports the edge or the line forming the end 21 ′ of the first shoulder at or near the base end thereof,
Further on the body or from the tip, the peripheral line is
The shoulder forms a third shoulder on the other side.

Continuation of the front page (72) Inventor Polier, Dominic France F-92130 Issy-les-Moulineaux, Qué de Stalingrad 228 (58) Fields investigated (Int. Cl. ⁶ , DB name) A61M 5/178- 5/34 A61M 5/50

Claims (8)

(57) [Claims] 1. A body (1) having at one end a means (5) for supporting an injection needle (6), a plunger (13) movable in the body, and the body (1) having an interior. A sliding protective sheath (14), a spring (17) interposed between the sheath (14) and the body (1), and means for attaching the sheath (14) to the body (1). The first and second shoulders (21, 23) provided on the outer wall of the main body (1) and the sheath (14), which are in contact with the first shoulder (21). Cooperate to set the first locking position to the first position in relation to the sheath (14).
At least one bent finger (19) formed in the direction, and the spring (17) is compressed, the needle (6) protrudes to a first position, and the first finger (19) is Abutting against the second shoulder (23) to form a second locking position in the same direction, the spring (17) is at least partially released,
In the second position, the needle (6) is housed in the sheath (14), and the transition from the first position to the second position is performed by cooperation of the plunger (13) and the bending finger (19). , First shoulder (21)
Finger (19) is released at the stroke end of the plunger (13), whereby the body (1) is sheathed by the biasing force of the spring (17) until the body (1) is locked in the second position. A syringe having an automatically retracting needle adapted to be retracted into the body (14), wherein the syringe has at least a second bent finger (20, 20 ', 33) and a third shoulder (24); Each has a first bent finger (19) and two shoulders (21, 23) in opposite directions, and a second bent finger (20, 20 ', 33) and a third shoulder (24) , Each sheath body (1
4) and located on the wall surface of the main body (4) such that when the main body (1) is in the locking position, the main body (1) is locked in the sheath body (14) in a direction opposite to the first direction. A syringe having an automatically retracting needle, characterized in that the syringe is retracted. 2. A lower portion (5) of the main body (1) is configured to be able to support a connecting end (7) for holding a needle, and a bottom end of a sheath body is provided with a hole (15) for inserting the connecting end. 2. A syringe with an automatically retracting needle according to claim 1, characterized in that it comprises: 3. Automatically as claimed in claim 1, wherein at least some of the fingers (15, 19) are bendable and are formed integrally with the sheath (14). A syringe with a retracting needle. 4. The method according to claim 1, wherein at least some of the fingers are protected on the outer surface by a sheath-shaped wall fixed to the sheath. Syringe with automatically retracting needle. 5. The main body (1) has a needle holding chuck (30), and at least some of the fingers (33) have a sheath body (1).
The syringe having an automatically retracting needle according to any one of claims 1 to 4, wherein the syringe is provided inside of (4) and around the chuck. 6. A syringe having an automatically retractable needle according to claim 1, wherein the needle holding chuck (30) includes a regulating portion (31). 7. One end of the spring (17) is supported by a portion of the body (1) having a high resistance.
A syringe having an automatically retracting needle according to any one of the preceding claims. 8. The syringe plunger (13) includes portions (22, 42) configured to directly engage the first finger (19).
A syringe having an automatically retracting needle according to any one of claims 1 to 7, characterized in that it comprises: