JP2001252355A - Puncturing appliance and indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puncturing appliance and an indwelling needle assembly improved in safety in the case of waste processing by covering the tip of a used puncturing needle body through a simple operation without complicating the structure and expanding the diameter. SOLUTION: This puncturing appliance has an inner puncturing needle 4 having a tip 41 at the top end, an inner acupuncture hub 5 installed on the base end side of the inner puncturing needle 4 and a protector 6 for covering the tip 41. The protector 6 is provided with a main body 7 of protector having a puncturing needle body passage 71 capable of inserting the inner puncturing needle 4 and an elastic member 8A composed of a coil spring. The elastic member 8A is housed inside a recessed part 72A. When the tip 41 of the inner puncturing needle 4 is passed toward the base end closely to the recessed part 72A, the elastic member is extended, and a movable end 82 is inserted through the recessed part 74 and turned into attitude crossing the puncturing needle body passage 71. In this attitude, the pass of the tip 41 toward the top end is blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a puncture device and an indwelling needle assembly. More specifically, for example, the present invention relates to a puncture device used for puncturing a blood vessel during infusion or blood collection, and an indwelling needle assembly provided with the puncture device.

[0002]

2. Description of the Related Art When an infusion is performed on a patient, an indwelling needle connected to an infusion line is punctured into a patient's blood vessel, and is indwelled. Such an indwelling needle has a hollow outer needle,
An outer needle hub fixed to the proximal end of the outer needle, an inner needle inserted into the outer needle and having a sharp needle tip at a distal end, and an inner needle hub fixed to the proximal end of the inner needle. ing.

When puncturing the indwelling needle into a patient's blood vessel, the inner needle is inserted into the outer needle, and the puncture operation is performed with the needle tip of the inner needle protruding from the tip of the outer needle. When the needle tip of the inner needle reaches the inside of the blood vessel, the blood flowing from the opening of the needle tip flows through the inner lumen of the inner needle and flows into the inside of the transparent inner needle hub (flashback). Thereby, it can be confirmed that the inner needle has secured the blood vessel.

[0004] After confirming the flashback, the inner needle and the outer needle are advanced slightly, and the tip of the outer needle is inserted into the blood vessel. Next, while grasping the outer needle by hand, the inner needle is pulled out from the outer needle, and the connector of the infusion line is connected to the outer needle hub. Then, the infusion is administered through the connected infusion line and the outer needle.

By the way, the inner needle extracted from the outer needle is
Since it becomes unnecessary, it is disposed of, but if it is discarded as it is, there is a possibility that an accident may occur in which a discarding worker or the like accidentally points a finger or the like with the tip of the inner needle. In particular, since blood adheres to and remains on the surface and inside of the inner needle, infection may occur due to such a stab.

Accordingly, measures have been taken such as disposing of the used inner needle in the opened packaging material containing the indwelling needle kit, or disposing the inner needle with a cap. I have.

However, even when such an inner needle is wrapped with a wrapping material or covered with a cap, blood adhering to or remaining on the inner needle may reach the operator's hand or work may be performed with the needle of the inner needle. In order to prevent erroneous stabbing of the hand of a patient, great care must be taken, and there is a problem that disposal of the inner needle after use requires a great deal of trouble.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to cover the needle tip of a used needle body by a simple operation without complicating the structure and enlarging the diameter, and to provide safety in disposal processing and the like. It is an object of the present invention to provide a puncture device and an indwelling needle assembly with high reliability.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (12).

(1) A puncture device having a needle body having a needle tip at a distal end and a protector for covering the needle tip, wherein the protector has a protector body having a needle body passage through which the needle body can be inserted. An elastic member provided facing the needle body passage, wherein the elastic member has a first posture retracted from the needle body passage so that the needle body can be inserted into the needle body passage, A part of the elastic member enters the needle body passage, and is capable of deforming to a second posture for blocking a part of the needle body passage and preventing the needle body from passing through the needle tip. Puncture device characterized by the following.

(2) The puncture device according to (1), wherein a recess is formed in an inner wall in the middle of the needle body passage, and the elastic member is housed in the recess when in the first posture.

(3) In the above (1) or (2), a locking portion for locking an end of the elastic member which has entered the needle body passage in the second posture is formed on an inner wall of the needle body passage. 2)
The puncture device according to 1.

(4) The puncture device according to any one of (1) to (3), wherein the elastic member is a linear body or a band-like body.

(5) The puncture device according to any one of (1) to (3), wherein the elastic member is a torsion spring.

(6) The elastic member is capable of expanding and contracting and is in the second posture by being extended, and a part of the extended elastic member is arranged in a longitudinal direction of the needle passage. The puncture device according to the above (1) or (2), which enters along the puncture device.

(7) The puncture device according to any one of (1) to (3) or (6), wherein the elastic member is a coil spring having a fixed end and a movable end.

(8) The puncture device according to the above (7), wherein the coil spring has a portion on the movable end side where the winding diameter is reduced continuously or stepwise.

(9) The outer diameter of the needle is D₁, The needle body
The inner diameter of the passage is D_TwoAnd 1 <D _Two/ D₁≦ 1.2
Any of the above (1) to (8) that satisfy the following relationship
The puncture device described.

(10) The puncture device according to any one of the above (1) to (9), wherein the needle body is a tubular inner needle, and has an inner needle hub at a base end side of the inner needle.

(11) The puncture device according to (10), a hollow outer needle into which the inner needle can be inserted, and an outer needle hub provided at a base end of the outer needle. Indwelling needle assembly.

(12) The indwelling needle assembly according to (11), wherein the protector and the outer needle hub can be fitted.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a puncture device and an indwelling needle assembly of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a side view showing a first embodiment in which the puncture device of the present invention is applied to an indwelling needle assembly, and FIGS. 2 and 3 are partial perspective views of the puncture device shown in FIG. 1, respectively. FIG. In the following description, the right side in FIGS. 1 to 3 is referred to as a “proximal end” and the left side is referred to as a “distal end”.

The indwelling needle assembly 1 shown in FIG. 1 includes an outer needle and an inner needle, and particularly constitutes an indwelling needle assembly for infusion. The outer needle 2 is an indwelling needle. An outer needle hub 3 provided at a base end of the outer needle 2, an inner needle (needle body) 4 used by being inserted into the outer needle 2, and an inner needle provided at a base end of the inner needle 4 A hub 5 and a protector 6 that covers the needle tip 41 of the inner needle 4 are provided. Of these, the inner needle 4, the inner needle hub 5, and the protector 6 constitute the puncture device of the present invention. Hereinafter, the configuration of each unit will be described.

The outer needle 2 preferably has a hollow shape and has a certain degree of flexibility. The constituent material of the outer needle 2 is not particularly limited.
Various soft resins such as tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferred.

Such an outer needle 2 may have all or part of its internal visibility. Further, an X-ray contrast agent such as barium sulfate or barium carbonate may be blended in the constituent material of the outer needle 2 to provide a contrast function.

The distal end of the outer needle 2 has a tapered shape whose outer diameter gradually decreases toward the distal end in order to puncture the living body easily and with minimal invasion.

An outer needle hub 3 is fixed to the proximal end of the outer needle 2 in a liquid-tight manner, and the inner cavity of the outer needle 2 communicates with the inside of the outer needle hub 3. The outer needle hub 3 is a substantially cylindrical member, and has a tapered shape whose outer diameter and inner diameter gradually increase toward the base end. The tapered portion is fitted with a tip portion of the protector 6 described later.

A flange 32 is formed on the outer periphery of the proximal end of the outer needle hub 3. For example, at the time of removing the protector 6 from the outer needle hub 3, this operation can be performed more reliably by hooking a finger on the flange 32 and performing this operation.

The outer needle hub 3 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured.

In this embodiment, the outer needle 2 is swaged and fixed to the outer needle hub 3 by a swaging member 31 (see FIG. 1). However, the method of fixing the outer needle 2 and the outer needle hub 3 is not limited to this, and may be, for example, a method of fusion (heat fusion, high frequency fusion, or the like), a method of bonding with an adhesive, or a method of these methods. And the above-mentioned caulking fixation may be used in combination.

The inner needle 4 is a hollow needle and is made of, for example, a metal material such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy.
A sharp needle tip 41 is formed at the tip of the inner needle 4. The shape of the needle tip 41 is not particularly limited, and in the present embodiment, the blade surface 42 inclined at a predetermined angle with respect to the axis of the inner needle 4.
It has the shape having.

The inner needle 4 is inserted into the inner cavity of the outer needle 2,
Further, the protector 6 is located at the most proximal side, and the outer needle hub 3 is fitted to the protector 6, that is, FIG.
Used in the state shown in Hereinafter, this state is referred to as an “assembled state”.

The length of the inner needle 4 is such that at least the needle tip 41 projects from the distal end opening 21 of the outer needle 2 in the assembled state.

The distal end of the inner needle hub 5 is fixed to the proximal end of the inner needle 4, and the lumen of the inner needle 4 communicates with the inner space of the inner needle hub 5. The inner needle hub 5 is formed of a substantially cylindrical hollow member.

The method of fixing the inner needle 4 to the inner needle hub 5 is as follows.
For example, a method such as fitting, caulking, fusion, or bonding with an adhesive, or a method using these in combination is exemplified.

The inner needle hub 5 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured. Thus, when the needle tip 41 secures a blood vessel, it is possible to visually check the flashback of blood flowing through the inner needle 4.

A flange 51 is provided on the outer periphery of the distal end of the inner needle hub 5.
Are formed. For example, when the operation of pulling out the inner needle 4 from the outer needle 2 is performed by hooking a finger on the flange 51 and performing this operation, this operation can be performed more reliably.

A ventilation filter 52 is provided at an opening on the proximal end side of the inner needle hub 5. This ventilation filter 5
No. 2 has a property of transmitting gas but blocking liquid.

Specific examples of the ventilation filter 52 include various sintered porous bodies, hydrophobic nonwoven fabrics, and other porous bodies. In this case, as the sintered porous body, a material obtained by sintering a material containing a polymer material (powder) such as polyethylene and a hydrophilic (water-soluble, water-swellable) polymer is preferable. When this sintered porous body is used, ventilation is blocked by contact with a liquid (blood), so that invasion of air from the outside can be prevented.

The constituent materials of the outer needle hub 3, the inner needle hub 5, and the protector body 7 described later are not particularly limited, and are, for example, polyolefins such as polyethylene, polypropylene, polybutadiene, ethylene-vinyl acetate copolymer, and the like, respectively. PVC, polyurethane, polystyrene,
Polymethyl methacrylate, polycarbonate, polyamide, polyester such as polyethylene terephthalate, polybutylene terephthalate, acrylic resin, ABS
Various resin materials such as resin, AS resin, ionomer, polyacetal, polyphenylene sulfide, and polyetheretherketone are exemplified.

The protector 6 has a protector body 7 composed of a substantially cylindrical member and an elastic member 8A. A needle passage 71 through which the inner needle 4 is inserted is formed at the center of the protector main body 7 so as to penetrate from the base end to the distal end of the protector main body 7.

The cross-sectional shape of the needle passage 71 is circular, and the inner diameter of the needle passage 71 is equal to the outer diameter of the inner needle 4.
Or it is set to a slightly larger value.

A concave portion (elastic member accommodating portion) 72A is formed in the inner wall of the needle body passage 71 in the middle. This recess 72
A has a cylindrical internal space.

A recess 74 is formed in the inner wall of the needle passage 71 at a position facing the recess 72A with the needle passage 71 interposed therebetween. The concave portion 74 has the same shape as the concave portion 72A, and constitutes a locking portion that extends and locks the end (movable end 82) of the elastic member 8A that has entered the needle body passage 71. .

The distal end of the protector body 7 is connected to the outer needle hub 3.
And a shape that can be fitted. For example, it has a tapered shape whose outer diameter gradually decreases toward the tip.

The proximal end of the protector main body 7 is configured to simply contact the distal end of the inner needle hub 5. However, the present invention is not limited to this. It may be configured so as to be able to fit with the part.

The elastic member 8A is capable of expanding and contracting, and is provided facing the needle body passage 71. One end of the elastic member 8A is a fixed end 81 always located on the bottom surface 73 of the concave portion, and the other end is a movable end 82 that moves as the elastic member 8A is deformed (contracted). The fixed end 81 may be fixed to the vicinity of the bottom surface 73 of the concave portion by, for example, a method such as fitting, caulking, or bonding with an adhesive, or may be simply pressed.

When the inner needle 4 is inserted (penetrated) through the needle body passage 71, the elastic member 8A is kept in a contracted state by the movable end 82 coming into contact with the inner needle 4, and almost the entirety of the recess 72A. In the first position (the position shown in FIG. 2). In other words, the elastic member 8A is attached to the needle body passage 7 so that the inner needle 4 can be inserted into the needle body passage 71.
1 has been evacuated.

When the inner needle 4 is not inserted into the needle passage 71, the elastic member 8A extends until the movable end 82 contacts the concave bottom surface 75, and the movable end 82 is inserted into the concave 74. (The posture shown in FIG. 3).
In this state, since a part of the elastic member 8A has entered (traversed) the needle body passage 71, the needle tip 41 of the inner needle 4
Is blocked by the elastic member 8A,
You cannot pass near A.

The elastic member 8A is urged by its own elastic force in the direction from the first posture to the second posture. Therefore, the elastic member 8A can be deformed from the first posture to the second posture by its own elastic force.

The elastic member 8A in this embodiment is formed by a coil spring. This coil spring, for example,
It is preferably formed by spirally forming a thin metal wire such as a superelastic alloy wire, a piano wire, a stainless steel wire, or a thin wire made of a relatively hard or resilient resin material such as polyacetal, polyphenylene sulfide, and polycarbonate. Such a coil spring expands and extends the needle body passage 71.
, The inner needle 4 can be deformed into a posture in which the inner needle 4 is effectively prevented from passing through the needle tip 41 and a posture in which the inner needle 4 is housed in a narrow space to allow the inner needle 4 to be inserted. By using a coil spring, the protector 6
Contributes to downsizing.

The coil spring in this embodiment is
Although the winding diameter is constant over the entirety, the present invention is not limited to this, and a coil spring (see FIG.
As shown in FIG. 4 and FIG. 4), the movable end 82 may have a portion in which the winding diameter decreases continuously or stepwise. If the coil spring has such a part,
When deforming from the first position to the second position, the movable end 82 of the coil spring can be more reliably inserted into the recess 74.

The concave portion 74 is provided as needed, and may not be formed. However, when the concave portion 74 is formed, the inner needle 4 can pass through the needle tip 41 more reliably. Can be blocked.

[0055] in D ₁ and the outer diameter of the needle 4, when the inner diameter of the needle body passageway 71 and a D _2, the ratio D ₂ / D ₁ of the inner diameter of the outer diameter and the needle body passageway 71 of the inner needle 4 is particularly Although not limited, 1 <D ₂ / D ₁
≦ 1.2, preferably 1 <D ₂ / D ₁ ≦ 1.05
Is more preferable. Within such a range,
Since the gap between the inner needle 4 and the needle body passage 71 is reduced, it is possible to more reliably prevent the inner needle 4 from pushing the elastic member 8A into this gap and unintentionally passing. Therefore, when D ₂ / D ₁ is within the above range, it is possible to more reliably prevent the inner needle 4 from passing through the needle tip 41 in the second posture.

Next, an example of a method of using the indwelling needle assembly 1 will be described in detail.

[1] While holding the indwelling needle assembly 1 in the assembled state, the inner needle 4 and the outer needle 2 are punctured into a blood vessel (vein or artery) of the patient.

When the needle tip 41 of the inner needle 4 is punctured into a blood vessel,
The blood flows backward in the inner needle 4 in the proximal direction due to the internal pressure (blood pressure) of the blood vessel, is introduced into the inner needle hub 5, and the flashback can be visually recognized through the inner needle hub 5 having visibility. . This makes it possible to know that the needle tip 41 of the inner needle 4 has secured a blood vessel.

Incidentally, with the inflow of the blood, the inner needle hub 5
The air inside is discharged through the ventilation filter 52,
Blood cannot pass through the ventilation filter 52 and does not leak to the outside.

[2] When the inner needle 4 and the outer needle 2 are further advanced in the distal direction by a small distance, the distal opening 21 of the outer needle 2 is inserted into the blood vessel. Thereby, the outer needle 2 secures a blood vessel.

[3] While holding down the outer needle 2 placed in the blood vessel by hand, grasp the inner needle hub 5 with the other hand and pull in the proximal direction. Thereby, the inner needle 4 is withdrawn from the outer needle 2. At this time, the protector 6 is connected to the outer needle hub 3.
Is maintained.

[4] According to the step [3], the inner needle 4
Moves in the proximal direction from the assembled state, but until the needle tip 41 of the inner needle 4 passes near the concave portion 72A inside the protector 6, the elastic member 8A has its movable end 82 The compressed state is maintained by engaging with the outer peripheral surface of the first member, and the first posture is maintained (see FIG. 2).

[5] When the inner needle 4 further moves in the proximal direction and the needle tip 41 passes near the concave portion 72A, the engagement is released, so that the elastic member 8A has its own urging force (elastic force). ), The movable end 82 enters the concave portion 74 after crossing the needle body passage 71, and contacts the concave bottom surface 75. As a result, the elastic member 8A assumes the second posture (see FIG. 3).

As described above, when the elastic member 8A is in the second posture, since the elastic member 8A intersects the needle body passage 71, even if the needle tip 41 attempts to move back to the tip direction, the The tip 41 contacts the elastic member 8A and cannot return.

In particular, since the movable end 82 is inserted into and locked in the concave portion 74, even when the force of the needle tip 41 pushing the elastic member 8A toward the distal end is increased to some extent, the elastic member 8A is connected to the concave portion 72A. Needle 41 to support at two places
Can be more reliably prevented from passing through. Further, since the movable end 82 is inserted into the concave portion 74, the blade surface 42 of the needle tip 41 presses the movable end 82 back to the inside of the concave portion 72A with the movement of the needle tip 41 in the distal direction, and the needle tip 41 does not unintentionally pass through the needle body passage 71.

In order to prevent the inner needle 4 from further moving in the proximal direction from this state and coming out of the protector 6, a restricting means for restricting the inner needle 4 from moving more than necessary in the proximal direction. (Not shown) is preferably provided.
As the restricting means, for example, a string of a predetermined length for connecting the inner needle hub 5 and the protector 6, or a foldable or contractible link for connecting the inner needle hub 5 and the protector 6 so as to cover the inner needle 4 is provided. A tube of a predetermined length, engagement by a convex portion provided on one of the outer surface of the inner needle 4 and the inner wall of the needle body passage 71 and a concave portion provided on the other, and a shape displacement portion provided on the inner needle 4 (particularly, , At the portion where the cross-sectional shape has changed) with the protector 6.

[6] When the needle tip 41 passes near the concave portion 72A and the elastic member 8A assumes the second position, the outer needle hub 3
The protector 6 fitted on the outer needle hub 3 is removed. Thus, the needle tip 41 is covered by the protector 6.

Further, an infusion set connector or the like (not shown) is quickly connected to the outer needle hub 3 of the outer needle 2 from which the inner needle 4 has been removed, and administration of the infusion is started according to a standard method.

After the inner needle 4 is extracted from the outer needle 2 in this way, the puncture device (the inner needle 4 and the inner needle hub 5) becomes unnecessary and is disposed of. This puncture device has a needle tip 4
1 is covered with the protector 6, and in particular, the needle tip 41 moves beyond the elastic member 8A to the distal end side and does not protrude from the distal end of the protector 6, so that a person who performs disposal processing needs the needle or the like. An accident in which a finger or the like is accidentally stabbed at the tip 41 is prevented.

FIGS. 4 and 5 are partial longitudinal sectional views showing a second embodiment of the puncture device (indwelling needle assembly) of the present invention.

Hereinafter, the configuration of the puncture device according to the second embodiment of the present invention will be described with reference to these drawings, but the description will focus on the differences from the above-described embodiment, and the same items will not be described. I do. In the following description, the right side in FIGS. 4 and 5 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

The puncture device shown in FIG. 4 and FIG.
The puncture device according to the first embodiment is the same as the puncture device according to the first embodiment except that the configuration of B and the configuration of the elastic member 8B and the manner of entry into the needle body passage 71 are different.

The concave portion 72B in this embodiment is
Like the concave portion 72A in the first embodiment, it has a cylindrical internal space. However, the recess 72B is
Differently, the distal end of the elongated elastic member 8B is provided at a predetermined angle with respect to the longitudinal direction of the needle body passage 71 so that a part of the distal end side enters along the longitudinal direction of the needle body passage 71.

As a result, the elastic member 8B extends from the first posture (the posture shown in FIG. 4), and after the movable end 82 contacts the inner wall of the needle body passage 71, the elastic member 8B It bends near where the passage 71 intersects, and can further extend in the tip direction. Then, on the distal end side from the bent portion, the elastic member 8B enters along the longitudinal direction of the needle body passage 71.

Therefore, when the elastic member 8B is in the second position (position shown in FIG. 5) for preventing the inner needle 4 from passing through the needle tip 41, a part of the elastic member 8B on the movable end 82 side is ,
It extends along the longitudinal direction of the needle body passage.

The elastic member 8B according to the present embodiment
Is a coil spring whose winding diameter continuously decreases gradually on the movable end 82 side. As described above, by using the coil spring having the portion in which the winding diameter is continuously or gradually reduced on the movable end 82 side, even when the inner needle 4 enters the inside of the coil spring, the needle tip 41 of the inner needle 4 can be moved. The needle spring 41 is locked to the portion where the winding diameter of the coil spring is reduced, so that the passage of the needle tip 41 can be more reliably prevented. Further, such a coil spring can be easily bent when bent near the intersection of the concave portion 72B and the needle body passage 71, so that the coil spring can smoothly enter the needle body passage 71. Such a portion where the winding diameter gradually decreases is provided as needed, and may not have such a portion.

In the present embodiment, the elastic member 8
It is preferable that the fixed end 81 of B is fixed near the concave bottom surface 73.

FIGS. 6 and 7 are partial longitudinal sectional views showing a third embodiment of the puncture device of the present invention.

Hereinafter, the configuration of the third embodiment of the puncture device according to the present invention will be described with reference to these drawings, but the description will focus on the differences from the above-described embodiment, and the description of the same items will be omitted. I do. In the following description, the right side in FIGS. 6 and 7 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

The puncture device shown in FIG. 6 and FIG.
It is the same as the puncture device of the first embodiment except that the configuration of C and the configuration of the elastic member 8C are different.

The recess 72C in this embodiment is formed to have a rectangular parallelepiped internal space.

The elastic member 8C according to the present embodiment is in the form of a linear body or a band, and is in a state as shown in FIG. 7 in a natural state (a state in which no external force is applied). One end of the elastic member 8C is a fixed end 81 embedded and fixed in the base end wall of the concave portion 72C, and the other end is a movable end 82 that moves with the deformation of the elastic member 8C. ing.

When the inner needle 4 is inserted through the needle body passage 71, the elastic member 8C keeps the state where the movable end 82 is engaged with the inner needle 4 so as to be folded into two, and almost the entirety. It is in the first posture (the posture shown in FIG. 6) housed in the recess 72C.

When the inner needle 4 moves in the proximal direction and the needle tip 41 passes near the concave portion 72C, the engagement is released, so that the elastic member 8C gradually bends from the first position. It is deformed so as to open and becomes the second posture (the posture shown in FIG. 7). In the second posture, since the movable end 82 has entered the needle body passage 71, even if the needle tip 41 of the inner needle 4 tries to move back to the tip direction, the needle tip 41 is moved to the elastic member 8C. Abut and cannot return.

In order to more reliably prevent the inner needle 4 from passing through the needle tip 41, if necessary, the inner wall of the needle body passage 71 may be provided at a position facing the recess 72C with the needle body passage 71 interposed therebetween. A concave portion (locking portion) for accommodating the movable end 82 of the elastic member 8C in the second posture may be provided.

FIGS. 8 and 10 are partial longitudinal sectional views showing a fourth embodiment of the puncture device of the present invention, and FIGS. 9 and 11 are respectively fourth embodiments of the puncture device of the present invention. FIG.

Hereinafter, the configuration of the puncture device according to the fourth embodiment of the present invention will be described with reference to these drawings, but the description will focus on the differences from the above-described embodiment, and the description of the same items will be omitted. I do. In the following description, the right side in FIGS. 8 and 10 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

The puncture device shown in FIGS.
The configuration is the same as the puncture device of the first embodiment except that the configuration of the elastic member 8D is different from that of the puncture device of the first embodiment.

The recess 72D in this embodiment is formed to have a rectangular parallelepiped internal space.

The elastic member 8D in the present embodiment is constituted by a torsion spring (torsion spring). One end of the torsion spring is a fixed end 81 embedded and fixed in a wall on the distal end side of the concave portion 72D, and the other end is a movable end that rotates with respect to the fixed end 81 due to deformation of the torsion spring. 82.

When the inner needle 4 is inserted through the needle body passage 71, the elastic member 8D engages with the inner needle 4 near the movable end 82 so that the angle between the fixed end 81 and the movable end 82 is 180 degrees. °
(A state in which an external force is applied), and the first posture (the posture shown in FIGS. 8 and 9) is almost entirely accommodated in the recess 72 </ b> D.

When the inner needle 4 moves in the proximal direction and the needle tip 41 passes near the concave portion 72D, the engagement is released, and the elastic member 8D is moved from the first position to the movable end 82.
Gradually rotates to the second posture (the posture shown in FIGS. 10 and 11). In the second posture, since the movable end 82 has entered the needle body passage 71, even if the needle tip 41 of the inner needle 4 attempts to return to the tip direction again, the needle tip 41 does not move.
Abuts on the elastic member 8D and cannot return.

In order to more reliably prevent the inner needle 4 from passing through the needle tip 41, if necessary, the inner wall of the needle body passage 71 may be located at a position facing the recess 72D with the needle body passage 71 interposed therebetween. A concave portion (locking portion) for accommodating the movable end 82 of the elastic member 8D in the second posture may be provided.

Although the puncture device and the indwelling needle assembly of the present invention have been described with reference to the illustrated embodiment, the present invention is not limited to this. , Can be replaced with any configuration that can exhibit the same function.

For example, a plurality of elastic members such as the elastic members 8A to 8D may be arranged along the longitudinal direction or the circumferential direction of the protector body 7.

The elastic member is not limited to the various springs described above, but may be made of an elastic material such as natural rubber or synthetic rubber.

The locking portion for locking the movable end 82 is not limited to the one having the concave portion 74.
It may be one in which a magnet for attracting 2 is embedded.

The puncture device of the present invention is not limited to a device constituting an indwelling needle assembly, and can be applied to, for example, an injection needle, a blood collection needle, a suture needle, and the like.

[0099]

As described above, according to the present invention, the needle body after use can be covered with the protector quickly and safely by a simple operation, and once covered by the action of the elastic member. The stylus tip does not protrude from the tip of the protector. For this reason, accidents such as accidentally stabbing a finger or the like with a needle point at the time of disposal or the like are prevented, and safety is high.

Further, the present invention can achieve the above-mentioned effects with a small and simple structure and a small number of parts. In particular,
As a means for preventing passage of the needle tip, an elastic member such as a coil spring, a leaf spring, and a torsion spring, which can be stored in a small recess, is used, thereby contributing to a reduction in the diameter and weight of the protector.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment when a puncture device of the present invention is applied to an indwelling needle assembly.

FIG. 2 is a partial cross-sectional perspective view showing a state when the elastic member is in a first posture in the first embodiment of the puncture device of the present invention.

FIG. 3 is a partial cross-sectional perspective view showing a state when an elastic member is in a second posture in the first embodiment of the puncture device of the present invention.

FIG. 4 is a partial longitudinal sectional view showing a state when an elastic member is in a first posture in a second embodiment of the puncture device of the present invention.

FIG. 5 is a partial longitudinal sectional view showing a state when an elastic member is in a second posture in the second embodiment of the puncture device of the present invention.

FIG. 6 is a partial longitudinal sectional view showing a state when an elastic member is in a first posture in a third embodiment of the puncture device of the present invention.

FIG. 7 is a partial longitudinal sectional view showing a state when an elastic member is in a second posture in a third embodiment of the puncture device of the present invention.

FIG. 8 is a partial longitudinal sectional view showing a state when an elastic member is in a first posture in a fourth embodiment of the puncture device of the present invention.

FIG. 9 is a cross-sectional view taken along line AA in FIG.

FIG. 10 is a partial longitudinal sectional view showing a state when an elastic member is in a second posture in a fourth embodiment of the puncture device of the present invention.

11 is a cross-sectional view taken along the line BB in FIG.

[Description of Signs] 1 indwelling needle assembly 2 outer needle 21 tip opening 3 outer needle hub 31 caulking member 32 flange 4 inner needle 41 needle tip 42 blade surface 5 inner needle hub 51 flange 52 ventilation filter 6 protector 7 protector body 71 needle Body passages 72A, 72B, 72C, 72D Recess 73 Recess bottom 74 Recess 75 Recess bottom 8A, 8B, 8C, 8D Elastic member 81 Fixed end 82 Movable end

Claims (12)

[Claims] 1. A puncture device having a needle body having a needle tip at a tip and a protector covering the needle tip, wherein the protector has a protector body having a needle body passage through which the needle body can be inserted. An elastic member provided facing the needle body passage, wherein the elastic member has a first posture retracted from the needle body passage so that the needle body can be inserted into the needle body passage; A second part in which the elastic member enters the needle passage and closes a part of the needle passage to prevent the needle from passing through the needle tip;
A puncture device characterized in that the puncture device can be deformed into a posture. 2. The puncture device according to claim 1, wherein a recess is formed in an inner wall in the middle of the needle body passage, and the elastic member is housed in the recess when in the first posture. 3. The needle body passage according to claim 1, wherein a locking portion for locking an end of the elastic member having entered the needle body passage in the second posture is formed on an inner wall of the needle body passage. Puncture device. 4. The puncture device according to claim 1, wherein the elastic member is a linear body or a band-like body. 5. The puncture device according to claim 1, wherein the elastic member is a torsion spring. 6. The elastic member is capable of expanding and contracting and assumes the second posture by being extended, and a part of the extended elastic member extends along a longitudinal direction of the needle body passage. The puncture device according to claim 1, wherein the puncture device enters through the puncture device. 7. The puncture device according to claim 1, wherein the elastic member is a coil spring having a fixed end and a movable end. 8. The puncture device according to claim 7, wherein the coil spring has a portion on the movable end side whose winding diameter decreases continuously or stepwise. 9. The method according to claim ₁ , wherein when the outer diameter of the needle body is D ₁ and the inner diameter of the needle body passage is D ₂ , the relationship 1 <D ₂ / D ₁ ≦ 1.2 is satisfied. The puncture device according to any one of the above. 10. The puncture device according to claim 1, wherein the needle body is a tubular inner needle, and has an inner needle hub at a base end side of the inner needle. 11. An indwelling device comprising: the puncture device according to claim 10; a hollow outer needle into which the inner needle can be inserted; and an outer needle hub installed at a base end of the outer needle. Needle assembly. 12. The indwelling needle assembly according to claim 11, wherein the protector and the outer needle hub can be fitted.