JPH1157002A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pull out an internal needle from a catheter by a simple operation, and ensure it safely. SOLUTION: This indwelling needle assembly 1 has a catheter 2 which is made to stay in an organism tissue, a catheter hub 3, an internal needle 4, an internal needle protector 6 having a tip end part 61 to which the catheter hub 3 is fitted, and an internal passage 62 in which the internal needle 4 can be housed, an operation member 7 which supports the internal needle 4 and is movable based on the internal needle protector 6, and a shutter mechanism 10 equipped with a needle stopping member 101 which closes the internal passage 62 and prevents the internal needle 4 from protruding from the tip end part 61 of the internal needle protector 6, and an elastic member 102 which urges the needle stopping member 101 so that the needle stopping member 101 may come into contact with the catheter hub 3. The needle stopping member 101 maintains a state of being fitted in the tip end part 61 by coming into contact with the catheter hub 3, and moves by a restoring force of the elastic member 102 when the contact with the catheter hub 3 is released under a state wherein the internal needle 4 is housed in the internal needle protector 6, and closes the internal passage 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling needle assembly.

[0002]

2. Description of the Related Art When an indwelling catheter used for infusion or the like is used, an inner needle is housed in the catheter and these are integrally punctured into a blood vessel. Next, after the catheter is inserted to a predetermined position, the inner needle is withdrawn, and an infusion line is connected to a proximal end following the catheter to allow a drug solution or the like to flow.

Here, the used inner needle that has been removed is to be discarded, but an operator, a patient, a disposal operator, or the like may accidentally touch the sharp needle tip and cause a wound. Used needles are contaminated with the patient's blood, body fluids, etc., and may be infected with hepatitis or various infectious diseases from needle wounds. Things.

[0004] In order to solve the above problems, various medical instruments (in-dwelling needle assemblies) having a needle tip protection member have been devised. As such a medical device, for example, Patent No. 2
No. 588375, the indwelling needle assembly of FIGS.
And those disclosed in JP-A-9-99069.

The indwelling needle assembly disclosed in Japanese Patent No. 2588375 includes a hollow handle surrounding a needle having a sharp tip, and a fixing means for fixing the needle with the tip protruding from the handle. By releasing the fixing means, the tip of the needle is permanently stored in the handle. In the case of the indwelling needle assembly disclosed in Japanese Patent No. 2588375, in order to release the fixing means, an operation of pressing the releasing means "trigger" in a direction different from the direction in which the needle is withdrawn is required.

[0006] However, when a special operation is required to protect the tip of the needle as described above, there is a case where a rapid procedure is hindered because the holding method and operation method of the operator are restricted.

The indwelling needle assembly disclosed in Japanese Patent Application Laid-Open No. 9-99069 discloses a housing for a needle (inner needle) 220 which is operated mainly by a catheter hub lock releasing mechanism 100 composed of a T-shaped structure 380. 140
The catheter hub 280 is separated at the same time as the catheter hub 280 is pulled into the inside.

According to this indwelling needle assembly, the catheter hub lock releasing mechanism (T) is urged and supported by the catheter hub 280 and the housing 140 by utilizing the elasticity of the arm portion 400 of the T-shaped structure 380. The T-shaped structure 380 is maintained in a locked state, and the T-shaped structure 380 is fixed by a needle 220 inserted through a central opening 240 provided in the T-shaped structure 380. Therefore, the needle 220 is pulled out to the base end side, and the tip of the needle 220
, The T-shaped structure 380 as shown in FIG.
Is detached from the catheter hub 280 by the restoring force of the arm 400 and at the same time, the needle 220 is
And form a barrier at the tip.

However, since the T-shaped structure 380 is supported against the restoring force of the arm 400 by the needle 220 inserted through the central opening 240 provided in the T-shaped structure 380, the needle 220 is in a T-shape. Since there is considerable sliding resistance when the needle 220 is pulled out while strongly contacting the structure 380, smooth and quick withdrawal is difficult, and the catheter inserted into the blood vessel may be pulled out together with the needle 220. There was a problem in operability.

[0010] Further, since the T-shaped structure 380 and the catheter hub 280 are engaged by the concave and convex portions provided respectively, the initial engagement state, the pulling force or the pulling speed of the inner needle, and the like are determined. In some cases, the catheter hub 280 cannot be separated at the same time as the needle 220 is pulled into the housing 140, and in that case, there is a problem that the catheter to be inserted and placed is unnecessarily pulled. In particular, if the separation of the catheter hub is delayed, there is a risk that the catheter may fall out of the blood vessel.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an indwelling needle assembly which can secure a used inner needle safely and can pull out the inner needle with a simple operation. is there.

[0012]

This and other objects are achieved by the present invention which is defined below as (1) to (8).

(1) A catheter which is inserted into and indwelled in a living tissue, a catheter hub fixed to a proximal end of the catheter, and a sharp needle tip which can be inserted into the lumen of the catheter and has a sharp distal end An inner needle having a distal end capable of mounting the catheter hub and an internal passage capable of storing the inner needle, an inner needle protector supporting a proximal end of the inner needle, and supporting the inner needle protector with respect to the inner needle protector. An operating member movable in the longitudinal direction, a needle stop member capable of closing the internal passage and preventing the inner needle from protruding from the distal end portion of the inner needle protector, and the needle stop member being brought into contact with the catheter hub. And a shutter mechanism having an elastic member that urges the catheter hub to come into contact with the catheter hub, wherein the needle stopper member is mounted on the distal end portion of the catheter hub by contacting the catheter hub. While maintaining the attached state, when the inner needle is housed in the inner needle protector and the contact with the catheter hub is released, the inner needle moves by the restoring force of the elastic member to close the inner passage. An indwelling needle assembly characterized by the above-mentioned.

(2) The indwelling needle assembly according to (1), wherein the inner needle is fixed in the internal passage when the needle stopper closes the internal passage.

(3) The contact surface between the needle stopper member and the catheter hub is formed along the moving direction of the inner needle, and the attached state of the catheter hub is maintained by the frictional force at the contact surface. The indwelling needle assembly according to the above (1) or (2), wherein

(4) The indwelling needle assembly according to any one of (1) to (3), wherein the frictional force is smaller than a holding force of the tissue holding the catheter inserted into the tissue.

(5) The indwelling needle assembly according to any one of (1) to (4), wherein the shutter mechanism cannot release the blockage once the internal passage of the inner needle protector is closed. .

(6) The indwelling needle assembly according to any one of (1) to (5), wherein the contact portion is housed inside the inner needle protector when the internal passage is closed.

(7) The shutter mechanism according to any one of (1) to (6), wherein the shutter mechanism is arranged so as not to come into contact with the inner needle when the inner needle is housed in the internal passage of the inner needle protector. Indwelling needle assembly.

(8) The indwelling needle assembly according to any one of (1) to (7), wherein the elastic member is formed of a leaf spring.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An indwelling needle assembly according to the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the indwelling needle assembly of the present invention. FIGS. 2 and 3 are longitudinal sectional views showing the operation of the indwelling needle assembly shown in FIG. 5 and 6 are a sectional view taken along line AA in FIG. 1, a sectional view taken along line BB in FIG. 2, and a sectional view taken along line CC in FIG. 3, respectively. 1 to 3
, The right side of the figure is referred to as “proximal end” and the left side is referred to as “distal end”.

As shown in these figures, an indwelling needle assembly 1 according to the present invention comprises a catheter 2 pierced and placed in a living tissue, a catheter hub 3 fixed to a proximal end of the catheter 2, a catheter 2 has an inner needle 4 which can be inserted into the inner cavity and has a sharp needle tip 41 at the distal end, a distal end 61 to which the catheter hub 3 can be attached, and an internal passage 62 which can store the inner needle 4. The inner needle protector 6 and the proximal end of the inner needle 4 are supported, the operating member 7 is movable with respect to the inner needle protector 6 in the longitudinal direction, and the internal passage 62 is closed to allow the inner needle 4 to be closed. The needle stop member 101 and the needle stop member 10 which can prevent the needle protector 6 from protruding from the distal end portion 61.
And a shutter mechanism 10 having an elastic member 102 for biasing the catheter hub 3 into contact with the catheter hub 3. The needle stopper member 101 is brought into contact with the catheter hub 3 to While maintaining the attached state to the inner needle protector tip 61,
When the contact with the catheter hub 3 is released in a state where the inner needle 4 is housed in the inner needle protector 6, the inner needle 62 is moved by the restoring force of the elastic member 102 to close the inner passage 62.

Hereinafter, each of these components will be sequentially described. The catheter 2 is formed of a hollow tube. As shown in FIGS. 2 and 3, the distal end portion 21 has a taper whose outer diameter gradually decreases toward the distal end in order to reduce resistance and stimulation when puncturing a living body. And is in close contact with the outer peripheral surface of an inner needle 4 described later. Thereby, puncturing can be performed smoothly.

The constituent material of the catheter 2 is not particularly limited, but soft resins such as ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferable. Further, in order to secure visibility such as flashback at the time of puncturing, it is preferable that the whole or a part of the catheter 2 is made of a transparent or translucent material. Furthermore, it is also possible to mix an X-ray contrast agent such as barium sulfate into the constituent material of the catheter 2 to provide a contrast function.

A catheter hub 3 is fixed to the proximal end of the catheter 2 by, for example, a metal caulking member (not shown). This fixing may be performed by bonding or fusing with an adhesive.

The catheter hub 3 is formed of a hollow tube, and has a storage portion 32 formed at a base end thereof, which can store a distal end portion 61 of an inner needle protector 6 described later. At least the inner diameter of the storage section 32 is reduced from the base end side toward the front end side. Thereby, attachment / detachment of the inner needle protector 6 to / from the distal end portion 61 of the catheter hub 3 can be facilitated, particularly, detachment.

In this embodiment, the catheter hub 3 has a base 31a having a constant inner diameter, and a tapered portion 31b having a reduced inner diameter toward the distal end at the distal end of the base 31a. The inner wall surface of the base 31a forms a contact surface with a later-described needle stop member 101, and the corresponding contact surface is formed along the moving direction of the inner needle 4.

As a constituent material of the catheter hub 3, for example, polyolefin such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer, polyvinyl chloride,
Various resin materials such as polybutadiene, polyamide, and polyester are exemplified.

It is preferable that these are made of a transparent or translucent material in order to secure the visibility of the inside. Thereby, the flashback of the blood can be visually recognized, and it can be easily confirmed that the catheter 2 has secured the blood vessel.

The inner needle 4 can be inserted into the lumen of the catheter 2, and its outer diameter is set to be equal to or slightly smaller than the inner diameter of the catheter 2. A sharp needle tip (blade tip) 41 is formed at the tip of the inner needle 4. This needle point 4
1 has a blade surface inclined at a predetermined angle with respect to the axis of the inner needle 4 in order to reduce piercing resistance and suppress tissue damage.

The length of the inner needle 4 is such that the needle tip 41 projects from the distal end of the catheter 2 and the distal end 21 of the catheter 2 in the assembled state (initial state) before puncturing shown in FIG.
Is set to be relatively short. Thereby, smooth and reliable puncture can be performed, and the catheter 2 can easily secure a blood vessel.

The constituent material of the inner needle 4 is, for example, a metal material such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy.

The operating member 7 is mainly composed of a gripping member 8 for gripping the inner needle 4 when the inner needle 4 is pulled out from the catheter 2 and a supporting member 9 for fixing the base end of the inner needle 4 and supporting the inner needle 4. The holding member 8 and the supporting member 9 are connected by a connecting member 81.

The gripping member 8 includes an inner needle protector 6 described later.
Is formed so as to be movable in the longitudinal direction, and has a tubular shape capable of containing a tubular body (the inner needle protector 6) therein, and has a base end opened.

Examples of the constituent material of the gripping member 8 include various resin materials such as polyolefin such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer, polyvinyl chloride, polybutadiene, polyamide and polyester. It is preferable that these are made of a transparent or translucent material in order to secure the visibility inside. Thereby, it can be easily confirmed that the inner needle 4 has secured the blood vessel.

The support member 9 has a hollow cylindrical shape.
The base end is sealed with a filter 91 made of, for example, a hydrophobic material. The filter 91 has a property of transmitting air but not transmitting a liquid such as blood. Therefore, the air in the support member 9 is exhausted, blood flows into the support member 9 via the inner needle 4, it can be confirmed that the needle tip 41 has secured a blood vessel, and the inflow blood leaks out. Nothing.

The supporting member 9 is connected to the holding member 8 by a connecting member 81. Thus, when the operating member 7 is moved while holding the holding member 8, the support member 9 and the inner needle 4 are moved together following the operation. The support member 9 is provided so as to be located substantially at the center of the inner needle protector 6, and when the operating member 7 is moved, the inner needle protector 6
It is arranged so that it may not contact the inner wall surface. Thereby, the sliding friction force when moving the operation member 7 can be reduced. After the inner needle 4 is stored in the inner needle protector 6, it is necessary that the inner needle 4 be designed so as not to be exposed to the outside from the slit 63. For this reason, for example, it is preferable to reduce the distance between the support member 9 and the inner wall surface of the inner needle protector 6 so that they do not contact each other.

The method of fixing the support member 9 and the inner needle 4 is not particularly limited. For example, the base end of the inner needle 4 is inserted into a hole 90 formed at the distal end of the support member 9, and an adhesive (or (Solvent) and solidification, and a method of fusion by heating or the like.

As the constituent material of the supporting member 9, the same material as that of the gripping member 8 can be used, and it is preferable that the supporting member 9 is made of a transparent or translucent material in order to secure the visibility inside.

The connecting member 81 is formed of a plate-like body, and includes the gripping member 8 located outside the inner needle protector 6 and the internal passage 62.
Is connected to the support member 9 located at the position (1). As shown in FIGS. 1 and 4, the inner needle protector 6 is movably inserted into a slit 63 provided on the side surface of the inner needle protector 6 along the longitudinal direction.

The connecting member 81 may be separate from the gripping member 8 or the supporting member 9 or may be integrally formed. When the connecting member 81 is a separate member, the same material as that for the gripping member 8 or the supporting member 9 described above can be used. The method of fixing the connecting member 81 to the gripping member 8 and the supporting member 9 is not particularly limited, and examples thereof include methods such as bonding with an adhesive and fusion (heat fusion, high frequency fusion, ultrasonic fusion, and the like). Can be

The inner needle protector 6 is a cylindrical member provided inside the gripping member 8, and has an inner passage 62 in which the inner needle 4 can be stored, and a distal end portion 61 at which the catheter hub 3 can be mounted at the distal end. And

The distal end portion 61 is formed in a tapered shape whose outer diameter gradually decreases toward the distal end side, and has a size and a shape that can be stored in the storage portion 32 of the catheter hub 3. A hole 611 through which the inner needle 4 can be inserted is formed in the distal end portion 61, and the inner diameter of the hole 611 is set slightly larger than the outer diameter of the inner needle 4. This allows the inner needle 4 to pass through the hole 611 without contacting the distal end portion 61, so that the resistance when removing the inner needle 4 can be reduced.

The internal passage 62 has a shape and length capable of accommodating the support member 9 and the inner needle 4 therein, and is open at the base end. Therefore, when the inner needle 4 is stored as shown in FIG. 2, the support member 9 protrudes from the open end. here,
The internal passage 62 refers to a space on the base end side and the front end side of the hole 641 and the shutter wall 64.

The shutter wall 64 is provided near the tip 61. The shutter wall 64 plays a role of restricting the movement of the needle stopper member 101 to the proximal end side and protecting the inner needle 4 housed in the inner needle protector 6 from protruding to the distal end again. The shutter wall 64 is provided with a hole 641 at the position coaxial with the catheter 2 and through which the inner needle 4 can be inserted. With such a hole 641, the inner needle 4 can easily and easily move the shutter wall 64 from the catheter 2 through the catheter hub 3 and the hole 611 without any resistance.

The shutter wall 64 may be provided so as to function as a restricting member that restricts the movement of the operating member 7 toward the distal end by contacting the distal end of the support member 9.

A slit 63 is provided on the outer peripheral surface of the inner needle protector 6 along the longitudinal direction, and an abutting end 65 is provided at a base end of the slit 63. As shown in FIG. 2, the end portion 810 of the connection member 81 inserted into the slit 63 abuts on the stop end 65 with the inner needle 4 stored in the inner needle protector 6. When the end 810 abuts against the stop end 65, it cannot move further proximally. Furthermore, the inner needle 4 cannot move to the distal end side because the later-described needle stopper member 101 blocks the internal passage 62. Accordingly, the inner needle 4 is thereby fixed to the inner passage 62.

Also, near the tip of the inner needle protector 6,
Preferably, a tab 67 protruding from the outer peripheral surface is provided. Thereby, when performing a delicate operation such as inserting only the catheter 2 slightly in order to position the distal end of the catheter 2 in the blood vessel, a finger can be engaged with the tab 67 and pressed in the distal direction. It is possible to easily transmit the movement of the finger to the tip of the catheter 2.

The constituent material of the inner needle protector 6 is not particularly limited, and the same material as that of the operation member 7 and the like can be used. Note that it is preferable to use a transparent or translucent material in order to secure the visibility of the inside. Thereby, the inner needle 4 is stored in the internal space 62, and it can be easily confirmed from the outside that the internal space 62 is closed.

Once the tip 41 of the inner needle 4 is stored near the tip 61 of the inner needle protector 6, the inner passage 62 is closed at the tip of the tip 41, and the inner needle 4 is closed. Is provided with a shutter mechanism 10 for preventing the protruding portion from protruding from the inner needle protector 6. This allows
The used inner needle 4 pulled out of the blood vessel can be stored and held in the inner needle protector 6 without going outside through the catheter, thereby preventing blood contamination and needle stick accidents of the operator performing the catheter placement procedure. As well as collecting and collecting the inner needle 4
It is possible to prevent blood contamination and needle stick accidents due to the operator touching the needle tip 41 at the time of disposal or the like.

The tip of the inner needle protector 6 has a needle stopper 10
An opening 66 through which one contact portion 1011 can be inserted is provided. As a result, the contact portion 1011 and the catheter hub 3 can come into contact with each other, and the catheter hub 3 can be attached to the distal end portion 61 of the inner needle protector 6. Further, the needle stop member 101 can move along the opening of the opening 66, and can open and close the internal passage 62.

The shutter mechanism 10 is connected to the internal passage 62.
And a resilient member 102 for urging the inner needle 4 to contact the catheter hub 3 by preventing the inner needle 4 from protruding from the distal end of the inner needle protector 6. And That is, when the contact with the catheter hub 3 is released while the inner needle 4 is housed in the inner needle protector 6, the needle stopper member 101 moves by the restoring force of the elastic member 102 and closes the internal passage 62. I do.

The needle stop member 101 is provided slidably (up and down) along the opening of the opening 66 at the front end side of the shutter wall 64 in FIG. The needle stopper 101 has a hole 1012 through which the inner needle 4 is inserted and a contact portion 1011 that contacts the catheter hub 3.

When the catheter hub 3 is mounted on the inner needle protector 6 as shown in FIGS. 1 and 2, the hole 1012 is provided in the hole 611 provided in the distal end portion 61 and the shutter wall 64. It is located coaxially with the hole 641. Therefore, the inner needle 4 can penetrate the catheter 2, the catheter hub 3, the distal end portion 61, the needle stopper 101, and the shutter wall 64, and the inner needle 4 can be easily removed.

The needle stopper 101 is in contact with the catheter hub 3 at the contact part 1011. That is, as shown in FIGS. 1 and 2, the needle stopper 101 is urged by the elastic member 102 so as to contact the contact portion 1011 of the catheter hub 3. The catheter hub 3
Is maintained in a state of being attached to the distal end portion 61. Thus, the catheter hub 3 can be reliably removed from the inner needle protector 6 only by pulling the operation member 7 toward the proximal end side. That is, the catheter hub 3 is
Since it is not connected (engaged) with the inner needle protector by the special lock mechanism as described in the prior art, no special operation or the like for releasing the lock mechanism is required, and the pull-out operation of the inner needle 4 is performed. The catheter hub 3 can be separated only by using the catheter hub 3 alone.

Further, the contact surface (base 31a) of the catheter hub 3 is formed along the moving direction of the inner needle 4,
It is preferable that the mounted state of the catheter hub 3 is maintained by the frictional force at the corresponding contact surface. Thereby, the inner needle 4
Disconnection of the catheter hub 3 by only the pull-out operation of
It can be performed more easily and reliably.

It is preferable that the frictional force is smaller than the holding force for holding the catheter 2 inserted into the tissue. By this, when disconnecting the catheter hub 3,
There is no need to hold down the catheter 2 inserted into the tissue, and the operation can be performed only by pulling the operation member 7 to the proximal end side with one hand. In addition, there is no possibility that the inserted catheter 2 will fall out of the tissue due to the tensile force when the operation member 7 is moved to the proximal end side.

Further, it is preferable that the frictional force is larger than the resistance accompanying the movement of the operation member 7. Thereby, while the operating member 7 moves to the proximal side along the outer peripheral surface of the inner needle protector 6, the catheter hub 3 may not come off from the inner needle protector 6 due to the pulling force to the proximal side due to the resistance. Absent.

The material of the needle stopper 101 is not particularly limited, but is preferably a hard material. By using the hard material, the inner needle 4 does not penetrate the needle stop member 101 and protrudes to the outside again, so that the above-described needle stick accident can be prevented.

Examples of such a hard material include hard polyvinyl chloride, polyethylene, polypropylene, polyolefin such as polybutadiene, polystyrene, and the like.
Poly- (4-methylpentene-1), polycarbonate, ABS resin, acrylic resin, polymethyl methacrylate (PMMA), polyacetal, polyarylate, polyacrylonitrile, polyvinylidene fluoride,
Ionomer, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate (PET),
Examples include polyesters such as polybutylene terephthalate (PTB), various resins such as butadiene-styrene copolymers, aromatic or aliphatic polyamides, and those in which these are arbitrarily combined.

The elastic member 102 is preferably a leaf spring made of an elastic body, and preferably has a C-shape surrounding the inner needle 4. Thereby, the needle stopper 1
In addition to restricting the movement of the inner needle 4, the inner needle 4 can be arranged so as not to be in contact with the inner needle 4 so as not to hinder the withdrawal of the inner needle 4.

The elastic member 102 is provided such that one end thereof is engaged with the needle stopper member 101 and the other end thereof is engaged with the inner surface of the inner needle protector 6. Thus, the position of the needle stopper 101 can be shifted by the expansion and contraction of the elastic member 102.

As shown in FIGS. 1 and 5, the elastic member 102 is engaged with the needle stopper 101 in a compressed state. The elastic member 102 causes the needle stopper member 101 to abut on the base 31a of the catheter hub 3 by its elastic force, whereby the attached state of the catheter hub 3 and the inner needle protector 6 can be maintained.

When the inner needle 4 is pulled out of the catheter 2 and the catheter hub 3 and the catheter hub 3 is separated from the inner needle protector 6, the restricted state of the needle stopper 101 is released. Needle stopper 1
01 moves. As a result, the hole 641 provided in the shutter wall 64 is closed by the needle stopper 101, and the internal space 62 is closed. Thus, the needle tip 41 does not pass through the hole 641 again and protrude from the tip of the inner needle protector 6.

The constituent material of the elastic member 102 is not particularly limited. For example, polyolefin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, cross-linked ethylene-vinyl acetate copolymer, etc. Examples thereof include thermoplastic resins such as polyester, polyvinyl chloride, polyurethane, polyamide, and polyamide elastomers, elastic materials such as natural rubber and silicone rubber, and spring-shaped metals such as stainless steel. The elastic member 102 may be formed separately from the needle stopper member 101, but may be formed integrally.

It is preferable that such a shutter mechanism 10 cannot be released once the internal passage 62 of the inner needle protector 6 is closed. Thereby, there is no possibility that the inner needle 4 housed in the inner needle protector 6 projects again.

Further, it is preferable that the shutter mechanism 10 is arranged so as not to come into contact with the inner needle 4 when the inner needle 4 is stored in the internal passage 63 of the inner needle protector 6.
Thereby, there is no possibility that the inner needle 4 housed in the inner needle protector 6 projects again.

It is preferable that the contact portion 1011 be housed inside the inner needle protector 6 when the internal passage 62 is closed. Thereby, the inner needle 4 can be housed in the inner needle protector 6 and held more reliably. That is, the contact portion 1011 outside the inner needle protector 6 causes the needle stopper member 101 to move due to malfunction due to contact or the like, and the hole 641
Communicates with the hole 1012 and the inner needle 4 is again
There is no danger of projecting from. Similarly, from the viewpoint of preventing malfunction, the inner needle 4 and the catheter 2 are protected by covering with a needle cap (not shown) until use, and the mouth of the needle cap is locked to the distal end of the operation member 7 until use. Preferably, it is configured. Thereby, the indwelling needle assembly 1
It is possible to prevent the inner needle 4 from being punctured before use, and to prevent the operating member 7 from jumping out from the proximal end of the inner needle protector 6.

An embodiment in which the contact portion 1011 is housed inside the inner needle protector 6 when the internal passage 62 is closed will be described below.

FIGS. 7 to 10 show another embodiment of the indwelling needle assembly of the present invention. In this embodiment, as shown in FIGS. 7, 9 and 10, the shutter mechanism 10
It comprises a needle stopper 101 having a recess 1013 for engaging the elastic member 102, a hole 1012 through which the inner needle 4 passes, and a leaf spring 102. The inner diameter of the hole 1012 is
As described above, in order to reduce the resistance when the inner needle 4 is pulled out, the outer diameter of the inner needle 4 is set to be slightly larger.

When the elastic member 102 is in the extended state,
The needle engaging member 101 is urged downward in the figure by engaging with the first concave portion 1013.

When the needle tip 41 moves to the proximal end side of the shutter wall 64 and the catheter hub 3 comes off, FIGS.
As shown in (1), the needle stopper member 101 moves below the inner needle protector 6 by the restoring force of the elastic member 102. As a result, the hole 641 of the shutter wall 64 is closed by the needle stopper 101, and the needle tip 41 is held in the inner needle protector 6.
At this time, the contact portion 1011 is embedded in the concave portion 613 formed in the distal end portion 61. Thereby, the contact portion 101
There is no danger that the needle stop member 101 moves due to a malfunction due to contact with the needle 1 or the like, the hole 641 communicates with the hole 1012, and the inner needle 4 projects again from the inner needle protector 6.

FIGS. 11 to 16 are views showing still another embodiment of the indwelling needle assembly according to the present invention.

The shutter mechanism 10 of this embodiment is similar to that of FIG.
As shown in FIG. 15, the inner needle protector 6 includes a needle stopper member 101 and a leaf spring 102 housed in the inner needle protector 6.

The needle stopper 101 has a hole 1012 through which the inner needle 4 passes. The inner diameter of the hole 1012 is set to reduce the resistance when the inner needle 4 is pulled out for the reason described above. , Are set slightly larger than the outer diameter of the inner needle 4.

The catheter hub 3 is provided with an extension 35 extending to the proximal side. The extension 35 is formed such that the contact surface with the needle stopper 101 is along the moving direction of the inner needle 4. The extension 35 is inserted into the internal passage 62 of the inner needle protector 6 from the opening 66, and is in contact with the needle stopper 101. At this time, the elastic member 102 is engaged with the needle stop member 101 in a compressed state.

When the needle tip 41 moves to the base end side of the shutter wall 64 and the catheter hub 3 is pulled out of the opening 66 and the contact is released, as shown in FIG. 13 and FIG. Is moved toward the wall surface of the inner needle protector 6 by the restoring force of the elastic member 102. Thereby, the shutter wall 6
The hole 641 of the fourth needle is closed by the needle stopper member 101, and the needle tip 41 of the inner needle 4 is held in the inner needle protector 6.

Also in this embodiment, since the contact portion 1011 is in the internal passage 62, there is no possibility that the inner needle 4 projects again from the inner needle protector 6 due to malfunction due to contact with the contact portion 1011 or the like. .

Next, an example of a method (operation) of using the indwelling needle assembly of the present invention will be described with reference to the drawings.

[1] Assemble in advance so that the inner needle 4 is positioned inside the catheter 2. At this time, the needle tip 41 protrudes from the distal end surface of the catheter 2.

[2] Next, the integrated inner needle 4 and catheter 2 are punctured into a living tissue (eg, vein or artery).

When the needle tip 41 of the inner needle 4 secures a blood vessel, the blood flows into the support member 9 via the lumen of the inner needle 4 due to the internal pressure (blood pressure) of the blood vessel. This flashback of blood
The operation member 7 and the inner needle protector 6 having visibility can be checked from the outside.
It can be seen that the needle tip 41 has secured a blood vessel.

[3] If necessary, place a finger on the tab 67 and press it slightly in the distal direction to securely insert the distal end of the catheter 2 into the blood vessel.

[4] When the distal end of the catheter 2 secures a blood vessel, the grasping member 8 is grasped with one hand, and the operating member 7 is pulled in the proximal direction. At this time, the connecting member 81 moves the outer peripheral surface of the inner needle protector 6 to the base end side along the slit 63,
The supporting member 9 connected to the gripping member 8 by the connecting member 81 also moves integrally to the base end side. Therefore, the inner needle 4 fixed to the support member 9 also moves to the proximal end side, and the needle tip 41 passes through the catheter 2, the catheter hub 3, the hole 611, and the hole 1012 of the needle stop member 101, and passes through the shutter wall 64.
Through the hole 641. Since the needle stop member 101 and the like do not abut on the inner needle 4, the resistance when removing the inner needle 4 is small.

At this time, the resistance accompanying the movement of the operating member 7 is smaller than the frictional force between the contact portion 1011 of the needle stopper 101 and the catheter hub 3, and the frictional force is inserted into the tissue. Since the holding force of the tissue held by the catheter 2 is smaller, there is no possibility that the catheter 2 inserted into the blood vessel is pulled out together with the inner needle protector 6. Further, it is not necessary to hold the catheter 2 and the catheter hub 3 so as not to move with the other hand.

[5] When the needle tip 41 passes through the hole 641, the end 810 abuts on the stop end 65. This allows
The support member 9 does not fall off from the proximal end side of the inner needle protector 6, and accordingly the inner needle 4 does not come out of the inner needle protector 6 and stops at an appropriate position (see FIG. 2).

[6] Further, when the operating member 7 is pulled toward the proximal end, the inner needle protector 6 is pulled toward the proximal end, and as a result, the catheter hub 3 is detached from the inner needle protector 6.

As described above, the frictional force between the contact portion 1011 and the catheter hub 3 is smaller than the holding force of the tissue that holds the catheter 2 inserted into the tissue. There is no possibility that the catheter 2 inserted into the blood vessel is pulled out together with the inner needle protector 6. Also,
It is not necessary to hold down the catheter 2 and the catheter hub 3 with the other hand.

[7] When the catheter hub 3 is detached from the inner needle protector 6, the needle stopper 101 moves by the restoring force of the elastic member 102. As a result, the hole 1012 located coaxially with the hole 641 moves, and at the same time, the hole 641
Is closed by the needle stopper member 101. Therefore, the needle tip 41 does not protrude from the hole 641 again, while the movement toward the base end side is also prevented by the stop end 65 and the end 810, so that the inner needle 4 is inserted into the inner needle protector 6. It is stored and held and is fixed in the internal passage 63 (see FIG. 3).

[8] After the inner needle 4 is withdrawn in this way, an infusion line or the like is connected to the catheter hub 3,
Infusion is performed according to the usual method.

Although the indwelling needle assembly of the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to these embodiments. The operation member 7 can be replaced with an arbitrary configuration as long as the same function can be exhibited.

For example, a projection or the like for preventing slipping of a finger may be provided on the outer peripheral portion of the gripping member 8.
2 may be composed of a plurality of leaf springs.
Further, in order to make the sliding between the operating member 7 and the inner needle protector 6 smoother, it is also possible to apply some low friction treatment to each sliding surface.

Further, the connection position, the connection method, and the structure of the connection member 81 between the gripping member 8 and the support member 9 are not limited to those shown in the drawings.

[0095]

Next, specific examples of the present invention will be described.

(Embodiment) The operation member 7 is moved by using an indwelling needle assembly (a model excluding the catheter 2) having the same shutter mechanism as the embodiment shown in FIGS. 1 to 3 described above. Was measured for the sliding resistance.

First, the catheter hub 3 was mounted on the distal end portion 61 of the inner needle protector 6 integrated with the operation member 7.

Next, the operating member 7 is moved toward the distal end of the inner needle protector 6, and the inner needle 4 is made to protrude from the catheter hub 3.

From this state, the gripping member 8 was gripped with one hand, moved toward the base end in a direction parallel to the axial direction of the inner needle protector 6, and the inner needle 4 was pulled out. The resistance value at this time was measured. The measurement was performed using a micro load tester (MODEL-1305) manufactured by AIKO ENGINEERING CO., LTD.
The setting was performed at mm / min. FIG. 15 shows the measurement results.

(Comparative Example) A model having the same structure as the indwelling needle assembly disclosed in Japanese Patent Application Laid-Open No. 9-99069 was prepared as shown in FIGS. Was pulled out to the base end side, and the resistance value at this time was measured. FIG. 15 shows the measurement results.

From the above results, in the case of the example, the resistance value when moving the inner needle was 1.0 to 1.2 g. On the other hand, in the case of the comparative example, the weight was 7.5 to 8.8 g.

Therefore, in the indwelling needle assembly of the embodiment, since the needle stopper member 101 and the elastic member 102 do not contact the inner needle 4, the resistance value of the inner needle 4 when sliding (moving) is low,
The T-shaped structure 380 is fixed by the needle 220 (in contact with each other) 1/7 of the case of the comparative example.
It can be seen that it has been reduced to １ ／.

[0103]

As described above, according to the indwelling needle assembly of the present invention, a simple operation of removing the inner needle in a conventional indwelling needle assembly having no needlepoint protection member can be performed. The operation does not change the feel when the inner needle is stored. Also, unlike the indwelling needle assembly with other needle tip protection members, special operation is not required, so the inner needle can be stored without discomfort, and the operation of removing the inner needle after indwelling the catheter or using Since the collection operation of the inner needle can be reliably performed, it is possible to safely and smoothly perform processing such as transportation and disposal of the contaminated inner needle.

Further, since the resistance at the time of removing the inner needle is extremely small, the withdrawal operation of the inner needle after inserting and placing the catheter, particularly the withdrawal of the inner needle into the inner needle protector and its state. Can be performed only by pulling the inner needle to the proximal end side without danger of pulling out the catheter placed in the blood vessel. Therefore, there is no need to release the lock by operating the fingertip, and the versatility is excellent because the operator's holding method and operation method are not limited.

The timing of disconnecting the catheter hub is always after the inner needle is stored in the inner needle protector in the above series of operations, so that the inner needle is not properly stored or the inner needle is pulled out. The catheter can be prevented from coming off during operation.

Also, once the inner needle is housed in the inner needle protector, the inner needle is locked so as not to move to the distal end side or the proximal end side, so that the needle tip may protrude from the inner needle protector. In addition, it is possible to prevent the occurrence of a needle stick accident due to a sharp needle point.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an indwelling needle assembly of the present invention.

FIG. 2 is a longitudinal sectional view showing the operation of the indwelling needle assembly shown in FIG.

FIG. 3 is a longitudinal sectional view showing the operation of the indwelling needle assembly shown in FIG.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a sectional view taken along line BB in FIG. 2;

FIG. 6 is a sectional view taken along line CC in FIG. 3;

FIG. 7 is a longitudinal sectional view showing another embodiment of the indwelling needle assembly of the present invention.

8 is a longitudinal sectional view showing the operation of the indwelling needle assembly shown in FIG.

FIG. 9 is a sectional view taken along line EE in FIG. 7;

FIG. 10 is a sectional view taken along line FF in FIG. 8;

FIG. 11 is a longitudinal sectional view showing still another embodiment of the indwelling needle assembly of the present invention.

12 is a vertical sectional view showing the operation of the indwelling needle assembly shown in FIG.

FIG. 13 is a sectional view taken along line HH in FIG. 11;

FIG. 14 is a sectional view taken along the line II in FIG. 12;

FIG. 15 is a graph showing a resistance value when an inner needle is moved in an indwelling needle assembly (model).

FIG. 16 is a longitudinal sectional view showing a lock release mechanism of a conventional indwelling needle assembly.

17 is a longitudinal sectional view showing the operation of the lock release mechanism of the indwelling needle assembly shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 indwelling needle assembly 2 catheter 21 tip 3 catheter hub 31 caulking member 31a base 31b taper 32 storage 35 extension 4 inner needle 41 needle tip 6 inner needle protector 61 tip 611 hole 613 recess 62 internal passage 63 slit 64 Shutter wall 641 Hole 65 Shock end 66 Opening 67 Tab 7 Operating member 8 Holding member 81 Connecting member 810 End 9 Supporting member 90 Hole 91 Filter 10 Shutter mechanism 101 Needle stop member 1011 Contact portion 1012 Hole 1013 Recess 102 Resilient member DESCRIPTION OF SYMBOLS 100 Unlocking mechanism 140 Guard housing 200 Guide sleeve 220 Needle 240 Central opening 260 Latch member 280 Catheter hub 300 Projection 320 Nose piece 340 Gasket 380 T-shaped structure 400 Arm 440 Arm 60 projection 500 luer lock projection

Claims (8)

[Claims] 1. A catheter that is inserted into a living tissue and placed therein, a catheter hub that is fixed to a proximal end of the catheter, and a sharp needle tip that can be inserted into a lumen of the catheter and that is a distal end. Having an inner needle, an inner needle protector having a distal end to which the catheter hub can be mounted, and an inner passage capable of storing the inner needle, and supporting a proximal end of the inner needle, An operation member movable in a longitudinal direction, a needle stopper member capable of closing the internal passage and preventing the inner needle from protruding from a distal end portion of the inner needle protector, and abutting the needle stopper member on the catheter hub. An indwelling needle assembly having an elastic member that urges the catheter hub, wherein the needle stopper member is attached to the distal end portion of the catheter hub by contacting the catheter hub. While maintaining the state, when the inner needle is housed in the inner needle protector and the contact with the catheter hub is released, it is moved by the restoring force of the elastic member to close the inner passage. A unique indwelling needle assembly. 2. The indwelling needle assembly according to claim 1, wherein the inner needle is fixed in the internal passage when the needle stopper closes the internal passage. 3. A contact surface between the needle stopper and the catheter hub is formed along a moving direction of the inner needle,
The indwelling needle assembly according to claim 1 or 2, wherein the attached state of the catheter hub is maintained by a frictional force at the contact surface. 4. The indwelling needle assembly according to claim 1, wherein the frictional force is smaller than a holding force of the tissue holding the catheter inserted into the tissue. 5. The indwelling needle assembly according to claim 1, wherein the shutter mechanism cannot release the blockage once the internal passage of the inner needle protector is closed. 6. The indwelling needle assembly according to claim 1, wherein said contact portion is housed inside said inner needle protector when said internal passage is closed. 7. The indwelling needle set according to claim 1, wherein the shutter mechanism is arranged so as not to come into contact with the inner needle when the inner needle is stored in an internal passage of the inner needle protector. Three-dimensional. 8. The indwelling needle assembly according to claim 1, wherein said elastic member comprises a leaf spring.