JP2012029974A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly which can certainly inhibit that liquid flows out from the base end of an outer needle hub in a condition that the inner needle has been removed from an outer needle.SOLUTION: The indwelling needle assembly 1 includes: an inner needle; an inner needle hub prepared in the base end part of the inner needle; a hollow outer needle 2 into which the inner needle is inserted; an outer needle hub 3 which is prepared at the base end part of the outer needle 2 and has an lumen section 34 which communicates with the inside of the outer needle; a valve element 8 which has a slit 84 which is installed so as to seal the lumen section 34 of the outer needle hub 3 and can be inserted by the inner needle with the outer needle 2, and consists of an elastic material; and a plug 9 which is installed in the lumen section 34 of the outer needle hub 3, has elasticity, and closes the slit 84 by pinching the valve element 8 from the tip side when the inner needle is removed from the outer needle 2 and the slit 84. The plug 9 includes two leaf springs 91a and 91b which have a bend 92 which has bent in the shape of a U character to the tip side.

Description

  The present invention relates to an indwelling needle assembly that punctures a blood vessel, for example, during infusion.

  When administering a medical solution to a patient, the indwelling device is punctured and placed in the patient's blood vessel.

  Such an indwelling device includes a hub having a syringe boat to which a syringe filled with a chemical solution is connected and a guide wire port into which a guide wire is inserted (see, for example, Patent Document 1). The guide wire port is provided with a valve body (hemostatic valve) that seals the guide wire port in a liquid-tight manner. With this valve body, it is possible to prevent blood from flowing out from the guide wire port when a flashback flowing into the guide wire port through the puncture needle occurs.

  By the way, the valve body is formed with a slit through which a guide wire can be inserted. This slit has a self-occlusion property when the guide wire is pulled out. However, if a guide wire is inserted into the slit for a long period of time, the guide wire will become wrinkled, and even if the guide wire is removed, the slit will not close, that is, the sealing performance (seal function) of the slit will be reduced. End up. And there was a problem that blood may leak from this slit.

JP 2009-232916 A

  An object of the present invention is to provide an indwelling needle assembly that can reliably prevent liquid from flowing out from the proximal end of an outer needle hub in a state in which the inner needle is removed from the outer needle.

Such an object is achieved by the present inventions (1) to (5) below.
(1) an inner needle having a sharp needle tip at the tip;
An inner needle hub provided at the proximal end of the inner needle;
A hollow outer needle through which the inner needle is inserted;
An outer needle hub provided at a proximal end portion of the outer needle and having a lumen communicating with the inside of the outer needle;
The outer needle hub is installed so as to seal the inner cavity portion, has a convergent shape, and is composed of an elastic material having an openable opening / closing portion through which the inner needle is inserted together with the outer needle. The disc,
An occlusion member that is installed in the inner cavity portion of the outer needle hub, has elasticity, and closes the opening / closing portion with the valve body sandwiched from the distal end side when the inner needle is removed from the outer needle and the opening / closing portion. And
The indwelling needle assembly is characterized in that the closing member is composed of at least one leaf spring having a curved portion that is curved or bent on the distal end side.

(2) The outer peripheral portion of the valve body is inclined with respect to the central axis of the outer needle,
The said closure member is an indwelling needle assembly as described in said (1) which contact | abuts the outer peripheral part of the said valve body, and has a contact part along the inclination direction of this outer peripheral part.

(3) The outer needle hub is a state in which the tubular body can be inserted into the lumen portion from the proximal end side in a state where the inner needle is removed,
When the tubular body is inserted into the inner cavity portion of the outer needle hub, the tubular body is configured so that the opening / closing section opens against the force of the closing member sandwiching the valve body. The indwelling needle assembly according to (1) or (2).

(4) The indwelling needle assembly according to any one of (1) to (3), further including a long pressing member that is provided on the outer needle hub and presses the outer needle.

(5) The indwelling needle assembly according to any one of (1) to (4), further including a gripping member provided on the inner needle hub and protruding from the inner needle hub in a distal direction.

  In the indwelling needle assembly of the present invention, it is preferable that a pair of the leaf springs are disposed via the valve body.

  In the indwelling needle assembly of the present invention, it is preferable that one end portion of the leaf spring is engaged with the outer needle hub.

  According to the present invention, in the extracted state in which the inner needle is extracted from the outer needle, the hole of the valve body is forcibly closed by the closing member. Thereby, in the extracted state, for example, when the outer needle punctures the living body, body fluid such as blood flowing from the outer needle can be reliably prevented from flowing out from the proximal end of the outer needle hub.

It is a perspective view which shows 1st Embodiment (assembly state) of the indwelling needle assembly of this invention. It is a perspective view which shows 1st Embodiment (extraction state) of the indwelling needle assembly of this invention. It is a perspective view for demonstrating an example of the usage method of the indwelling needle assembly shown in FIG. It is a perspective view for demonstrating an example of the usage method of the indwelling needle assembly shown in FIG. It is a perspective view for demonstrating an example of the usage method of the indwelling needle assembly shown in FIG. It is a perspective view for demonstrating an example of the usage method of the indwelling needle assembly shown in FIG. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is a longitudinal cross-sectional view which shows the state which inserted the pipe body in the outer needle hub of the indwelling needle assembly shown in FIG. It is a longitudinal cross-sectional view which shows the inner side of the outer needle hub of 2nd Embodiment (extraction state) of the indwelling needle assembly of this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment (assembly state) of the indwelling needle assembly of this invention.

  Hereinafter, the indwelling needle assembly of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

<First Embodiment>
FIG. 1 is a perspective view showing a first embodiment (an assembled state) of the indwelling needle assembly of the present invention, and FIG. 2 is a perspective view showing a first embodiment (an extracted state) of the indwelling needle assembly of the present invention. 3 to 6 are perspective views for explaining an example of how to use the indwelling needle assembly shown in FIG. 1, FIG. 7 is a cross-sectional view taken along line AA in FIG. 1, and FIG. BB sectional view in FIG. 2, FIG. 9 is a longitudinal sectional view showing a state in which the tubular body is inserted into the outer needle hub of the indwelling needle assembly shown in FIG. In the following, for convenience of explanation, the lower left side in FIGS. 1 to 6 is referred to as “tip”, the upper right side is referred to as “base end”, the left side in FIGS. Say "base". Moreover, in FIG. 1 to FIG. 6, illustration of blood vessels is omitted.

  As shown in FIGS. 1 and 2, the indwelling needle assembly 1 includes an indwelling needle 11 and a puncture needle 12, and includes a first state (assembled state) shown in FIG. 1 and a second state shown in FIG. The state (extraction state) can be taken. The first state is a state in which the puncture needle 12 is inserted into the indwelling needle 11 from the proximal end side and assembled. The second state is a state in which the puncture needle 12 is removed from the first state in the proximal direction.

  The indwelling needle 11 is installed in the outer needle hub 3, the outer needle hub 3 fixed to the proximal end portion of the outer needle 2, the pressing member 6 connected to the outer needle hub 3, and the outer needle hub 3. A valve body 8 and a closing member 9. The puncture needle 12 has an inner needle 4 inserted into the outer needle 2, an inner needle hub 5 fixed to the proximal end portion of the inner needle 4, and a gripping member 7 connected to the inner needle hub 5. ing. Hereinafter, the configuration of each unit will be described.

First, the puncture needle 12 will be described.
As shown in FIG. 1, the inner needle 4 has a sharp needle tip 41 at its tip. The length of the inner needle 4 is set to such a length that at least the needle tip 41 protrudes from the distal end opening 22 of the outer needle 2 in the first state.

  The inner needle 4 is a hollow needle in the configuration shown in FIG. 7, but is not limited to this. For example, the inner needle 4 may be a solid needle, and both the hollow portion and the solid portion may be provided. It may have a configuration (for example, a configuration in which the distal end side is hollow and the proximal end side is solid by filling a part of the lumen of the hollow needle).

  Further, the inner needle 4 may have a constant outer diameter, or may have a plurality of portions having different outer diameters.

  Examples of the constituent material of the inner needle 4 include a metal material such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy.

  The inner needle hub 5 is fixed to the proximal end portion of the inner needle 4 by, for example, a method such as fitting, caulking, fusing, adhesion with an adhesive, or a method using these in combination.

  The inner needle hub 5 is composed of a cylindrical member. A ventilation filter is preferably installed in the opening 52 on the proximal end side of the inner needle hub 5 so as to cover the opening 52. This ventilation filter has a property of permeating gas but blocking liquid, and is composed of, for example, various sintered porous bodies. Thereby, when the blood flows down the inner needle 4 and reaches the ventilation filter, the ventilation is blocked by the contact with the blood, so that the entry of air from the outside can be prevented.

  A gripping member 7 is disposed on the outer peripheral side of the inner needle hub 5. The gripping member 7 has a proximal end 75 connected to the inner needle hub 5 and protrudes from the inner needle hub 5 in the distal direction. Thereby, in the operation of indwelling the outer needle 2, the gripping member 7 can be gripped by hand, and the operation can be performed easily and reliably.

  The gripping member 7 has a long shape, and includes a bottom plate 71 and two wall portions 72 and 73 erected on the bottom plate 71.

  In the first state, the indwelling needle 11 is stored in a space inside the gripping member 7, that is, a space surrounded by the bottom plate 71 and the walls 72 and 73 (see FIG. 1). Thereby, it is possible to prevent the pressing member 6 from shifting in the width direction. As shown in FIG. 3, when the pressing member 6 is pressed in the distal direction, the pressing member 6 is moved in that direction while being guided by the gripping member 7, so that the pressing operation can be easily performed. Can do.

  A plurality of ribs 721 and 731 extending in the vertical direction are arranged in parallel as anti-slip members on the outer surfaces of the front ends of the side walls 72 and 73, respectively. Thereby, it is possible to prevent the hand from slipping when the gripping member 7 is gripped by hand.

  The constituent materials of the inner needle hub 5 and the gripping member 7 are not particularly limited, for example, polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyurethane, polyamide, polyester, polycarbonate, polybutadiene, polychlorinated Various resin materials such as vinyl and polyacetal are listed.

  Next, the indwelling needle 11 will be described. As described above, the indwelling needle 11 includes the outer needle 2, the outer needle hub 3, the pressing member 6, the valve body 8, and the closing member 9 (see FIGS. 1 and 2).

  As shown in FIGS. 7 to 9, the outer needle 2 is configured by a flexible tube having a lumen portion (hollow portion) 21.

  The outer needle 2 has a certain degree of flexibility, and a resin material, particularly, a soft resin material is suitable as a constituent material thereof. Specific examples thereof include fluorine-based materials such as PTFE, ETFE, and PFA. Examples thereof include resins, olefinic resins such as polyethylene and polypropylene, or a mixture thereof, polyurethane, polyester, polyamide, polyether nylon resin, a mixture of the olefinic resin and an ethylene-vinyl acetate copolymer, and the like. All or part of the outer needle 2 may have internal visibility. Further, in the constituent material of the outer needle 2, for example, an X-ray contrast agent such as barium sulfate, barium carbonate, bismuth carbonate, and tungstic acid can be blended to have a contrast function.

  The outer needle hub 3 is liquid-tightly fixed to the proximal end portion of the outer needle 2 by a method such as caulking, fusing (thermal fusing, high frequency fusing, etc.), adhesion using an adhesive, and the like.

  The outer needle hub 3 is formed of a cylindrical member, and the lumen portion 34 thereof communicates with the lumen portion 21 of the outer needle 2.

  A flange 31 having an enlarged outer diameter is formed on the outer peripheral portion of the proximal end portion of the outer needle hub 3. As shown in FIG. 7, the base end portion 75 of the gripping member 7 of the puncture needle 12 is in contact with the flange 31 in the assembled state. Thereby, the protrusion length from the tip opening 22 of the outer needle 2 of the needle tip 41 of the inner needle 4 is regulated.

  Further, a taper portion 35 whose inner diameter gradually decreases in the distal direction is formed at the proximal end portion of the inner peripheral portion 36 of the outer needle hub 3. As shown in FIG. 9, in the extracted state, the tubular body 20 can be inserted into the tapered portion 35 (the lumen portion 34) from the proximal end side. The outer diameter of the tubular body 20 is also gradually reduced in the distal direction, and examples thereof include a mouth portion of a syringe filled with a chemical solution, a connection port of a connector such as a three-way stopcock, and a tube constituting an infusion line.

  As shown in FIGS. 1 and 2, a pressing member 6 is disposed on the outer peripheral portion of the outer needle hub 3. The pressing member 6 is a member that presses the outer needle 2 in an operation of placing the outer needle 2. The pressing member 6 is disposed along the longitudinal direction of the outer needle 2, and is provided on a main body portion 61 having a long plate shape located on the outer needle 2, and a front surface of the main body portion 61. It has a plurality of finger hooking protrusions 62 and a pressing portion 64 configured by a part of the back side surface of the main body portion 61.

  The plurality of finger hooking protrusions 62 are formed so as to protrude upward in FIGS. 1 and 2. Further, these finger hooking protrusions 62 are arranged at equal intervals along the longitudinal direction of the main body 61. Since the finger hooking protrusion 62 is formed, when the outer needle 2 is moved in the distal direction relative to the inner needle 4 in the operation of placing the outer needle 2 in the blood vessel, the finger hooking protrusion 62 is moved in the direction of the finger. Can be pressed. And the outer needle 2 can be moved by this pressing force (refer FIG. 3). Further, the length of insertion of the outer needle 2 into the blood vessel can be grasped by confirming the position of each finger hooking protrusion 62 with respect to the grasping member 7 of the puncture needle 12. Thus, each finger hooking protrusion 62 has a function as a scale indicating the insertion length of the outer needle 2 into the blood vessel.

  In the present embodiment, the pressing portion 64 uses a part of the back surface of the main body portion 61 as it is. However, the pressing portion 64 is not limited to this, and for example, a protrusion or the like that protrudes from the back surface of the main body portion 61. You may comprise. Since the pressing portion 64 is formed, even when the length of the outer needle 2 is relatively long, an intermediate portion in the longitudinal direction of the outer needle 2 is inserted through the pressing portion 64 of the pressing member 6 during the puncturing operation. The pressing portion 64 is pressed downward in FIG. 3 to suppress the bending of the outer needle 2, and the puncturing operation can be performed easily and reliably.

  The pressing member 6 is connected to the outer needle hub 3 so as to be rotatable. The configuration of the rotation support portion is not particularly limited. For example, in this embodiment, the shaft 63 provided at the proximal end portion of the main body portion 61 and the outer peripheral portion of the outer needle hub 3 are provided. And a bearing 32 that supports the shaft.

Then, the pressing member 6 can be displaced to the first position shown in FIGS. 1 to 5 approaching the outer needle 2 and the second position shown in FIG. 6 retracted from the outer needle 2. When performing the puncturing operation, the pressing member 6 is in the first position. In addition, for example, after the outer needle 2 is indwelled, when the pressing member 6 gets in the way for the operator (user) or patient (user), the pressing member 6 is turned to the second position. Can be moved.
The pressing member 6 may be configured to be detachable from the outer needle hub 3.

  The constituent materials of the outer needle hub 3 and the pressing member 6 are not particularly limited, and for example, the same materials as those exemplified as the constituent materials of the inner needle hub 5 and the gripping member 7 can be used.

  The inner needle hub 5, the gripping member 7, and the outer needle hub 3 are each preferably made of a transparent (colorless and transparent), colored transparent or translucent resin to ensure internal visibility. Thereby, when the outer needle 2 secures the blood vessel, it is possible to visually confirm the flashback through which the blood flows through the inner lumen of the inner needle 4 through the inner lumen of the inner needle 4.

  As shown in FIGS. 7 to 9, the valve body 8 is accommodated in the inner lumen 34 of the outer needle hub. The valve body 8 can be a duckbill valve having a convergent shape (funnel shape) in which the inner peripheral portion 81 and the outer peripheral portion 82 are inclined with respect to the central axis of the outer needle 2. The middle can be sealed.

  A slit (opening / closing portion) 83 that can be opened and closed is formed at the tip of the valve body 8. The valve body 8 is comprised with the elastic material, and, thereby, the slit 84 has a self-occlusion property. As shown in FIG. 7, in the assembled state, the slit 84 is in a state where the inner needle 4 is inserted together with the outer needle 2. In the state where the inner needle 4 is inserted into the slit 84, the inner surface of the slit 84 is brought into close contact with the outer peripheral surface of the inner needle 4 by the elasticity of the valve body 8 itself, and the liquid tightness is maintained.

  Further, a flange 83 having an enlarged outer diameter is formed at the base end portion of the outer peripheral portion 82 of the valve body 8. The flange 83 is inserted into a ring-shaped groove 361 formed in the inner peripheral portion 36 of the outer needle hub 3 along the circumferential direction. Thereby, the valve body 8 is fixed to the outer needle hub 3.

  The shape of the slit 84 is not particularly limited, and may be, for example, a single character shape, a cross shape, or a Y shape (t-shape). In addition to such a shape, a pinhole shape can also be used.

  The elastic material constituting the valve body 8 is not particularly limited. For example, natural rubber or various synthetic rubbers such as isoprene rubber, silicone rubber, urethane rubber, styrene-butadiene rubber, fluorine rubber, and acrylic rubber, polytetra Examples include elastic materials such as fluoroethylene porous bodies, various thermoplastic elastomers such as polyamide and polyester, and polyurethane porous bodies.

  As shown in FIGS. 7 to 9, the closing member 9 is housed together with the valve body 8 in the lumen 34 of the outer needle hub. The closing member 9 closes the slit 84 of the valve body 8. The closing member 9 is composed of a pair of leaf springs 91 a and 91 b disposed via the valve body 8. Since the plate spring 91a and the plate spring 91b have the same configuration, the plate spring 91a will be representatively described below.

  The leaf spring 91a has a curved portion 92 that is curved in a U shape (or bent in a V shape) in the middle of its longitudinal direction. The curved portion 92 of the leaf spring 91a is disposed on the tip side.

  Moreover, the one end part 93 of the leaf | plate spring 91a is bent toward the outer side. The bent one end portion 93 is engaged with a groove 362 formed in the inner peripheral portion 36 of the outer needle hub. As a result, the leaf spring 91a is cantilevered by the outer needle hub. The groove 362 is formed at a position different from the groove 361 in the inner peripheral portion 36 of the outer needle hub, that is, at the tip side of the groove 361.

  On the other hand, the other end portion 94 of the leaf spring 91a is in contact with the outer peripheral portion 82 of the valve body 8 so as to follow the inclined direction. Thus, in the leaf spring 91a, the other end portion 94 is a contact portion that contacts the outer peripheral portion 82 of the valve body 8.

  When the leaf springs 91a and 91b configured as described above are installed on the outer needle hub 3, the curvature of the curved portion 92 becomes larger than that in the natural state, and the outer peripheral portion of the valve body 8 at the other end portion 94. 82 can be energized. As a result, the valve body 8 is sandwiched by the other end portions 94 of the leaf springs 91a and 91b from the tip side, and the slit 84 is closed in the extracted state shown in FIG. Here, the “natural state” refers to a state where no external force is applied.

  For example, even if the assembled state is maintained for a long period of time, that is, when the inner needle 4 is inserted through the slit 84 for a long period of time, even if the slits 84 are wrinkled by the inner needle 4, A combination of the fact that the slit 84 is closed and the fact that the slit 84 has a self-closing property can solve the problem that the slit 84 is not sufficiently and surely closed by the scissors. Thereby, in the extracted state, when the outer needle 2 secures the blood vessel, the blood flowing from the distal end opening 22 of the outer needle 2 passes through the valve body 8 and flows out from the proximal end of the outer needle hub 3. It can be surely prevented.

  As a constituent material of the leaf springs 91a and 91b, a material having a higher elastic modulus than that of the constituent material of the valve body 8 is preferable. For example, stainless steel, Ni—Ti alloy, Cu—Zn alloy, Ni—Al alloy, etc. Examples include elastic metal materials such as silicone rubber, polyacetal, acrylonitrile-butadiene-styrene copolymer (ABS resin), polyphenylene sulfide, polycarbonate, polyether ether ketone (PEEK), and the like. It is done.

Next, an example of how to use the indwelling needle assembly 1 (when puncturing a blood vessel) will be described.
[1] As shown in FIG. 1, the indwelling needle assembly 1 is set in an assembled state, the pressing member 6 is positioned at the first position, and the distal end portion of the gripping member 7 provided on the inner needle hub 5 is, for example, one side. Holding the hand with the index finger of one hand on the most advanced finger hooking protrusion 62 of the pressing member 6 and pressing the vicinity of the base of the finger hooking protrusion 62 downward with the index finger, the tip of the indwelling needle assembly 1 is moved. The epidermis is punctured toward the blood vessel so as to be pressed against the patient. At this time, the pressing portion 64 presses a portion between the proximal end and the distal end of the outer needle 2 downward, so that bending of the inner needle 4 and the outer needle 2 can be suppressed.

  [2] When the needle tip 41 of the inner needle 4 is punctured into a blood vessel, blood flows into the inner needle 4 in the proximal direction due to blood pressure, and is introduced into the inner needle hub 5 so that the inner needle hub has visibility. This flashback can be seen through 5. Thereby, it can be known that the needle tip 41 of the inner needle 4 has secured the blood vessel.

  Further, blood also flows into the outer needle 2, and the flashback can be visually recognized by this inflow. The blood flowing in through the outer needle 2 is prevented from flowing from the valve body 8 to the proximal end side by the valve body 8 in the lumen 34 of the outer needle hub 3 (see FIG. 7).

  [3] Next, as shown in FIG. 3, the inner needle 4 is used as a guide, and the outer needle 2 is further advanced along the inner needle 4 toward the distal end by a minute distance. At this time, with the index finger, the most advanced finger hooking protrusion 62 is pressed in the distal direction, and the outer needle 2 is moved in the distal direction.

  [4] Next, as shown in FIG. 4, with the index finger, the finger hooking protrusion 62 on the base end side is pressed in the distal direction, the outer needle 2 is moved in the distal direction by a minute distance, and this is sequentially performed. The tip of the needle 2 is inserted to the target position in the blood vessel.

  [5] Next, as shown in FIG. 5, while holding the pressing member 6 on the outer needle 2 side placed in the blood vessel with the other hand, the proximal end portion of the gripping member 7 or the inner needle hub with one hand. Grip 5 and pull in the proximal direction. Thereby, the inner needle 4 is extracted from the outer needle 2, and the indwelling needle assembly 1 is in an extracted state. After the inner needle 4 has been extracted from the outer needle 2 in this way, the inner needle 4 and the inner needle hub 5 become unnecessary and are discarded.

  Further, as described above, the slit 84 is sufficiently and reliably closed in the extracted state (see FIG. 8). This reliably prevents blood flowing from the outer needle 2 from flowing out from the proximal end of the outer needle hub 3.

  [6] After the inner needle 4 is removed from the outer needle 2, the pressing member 6 may be rotated as shown in FIG. 6 to be positioned at the second position, if necessary, without rotating. Alternatively, the first position may be maintained.

  As shown in FIG. 9, the tubular body 20 can be connected to the tapered portion 35 of the outer needle hub 3 from which the inner needle 4 has been removed. At this time, the tube body 20 is inserted halfway through the valve body 8, and the slit 84 can be opened against the urging force of the leaf springs 91 a and 91 b, that is, the force sandwiching the valve body 8. And administration of the infusion to a patient can be started via the tubular body 20, for example. As described above, in the indwelling needle assembly 1 in the removed state, the slit 84 of the valve body 8 can be opened without the pipe body 20 penetrating the valve body 8.

<Second Embodiment>
FIG. 10 is a longitudinal sectional view showing the inside of the outer needle hub of the second embodiment (withdrawal state) of the indwelling needle assembly of the present invention. For convenience of explanation, the left side in FIG. 10 is referred to as “tip” and the right side is referred to as “base end”.

Hereinafter, the second embodiment of the indwelling needle assembly of the present invention will be described with reference to this figure. However, the difference from the above-described embodiment will be mainly described, and the description of the same matters will be omitted.
The present embodiment is the same as the first embodiment except that the shape of the closing member is different.

  In the indwelling needle assembly 1 </ b> A shown in FIG. 10, each of the leaf springs 91 a and 91 b is formed with a deformed portion 941 that is curved and deformed in the middle of the other end portion 94. Each deformation portion 941 is separated from the outer peripheral portion 82 of the valve body 8.

  By forming such a deformed portion 941, when the tube body 20 is inserted into the valve body 8, a part of the outer peripheral portion 82 of the valve body 8 is pressed by the pressing force toward the distal end of the tube body 20. Can easily enter the respective deformed portions 941 on the outside. Thereby, the slit 84 of the valve body 8 can open easily and reliably.

<Third Embodiment>
FIG. 11 is a longitudinal sectional view showing a third embodiment (assembled state) of the indwelling needle assembly of the present invention. For convenience of explanation, the left side in FIG. 11 is referred to as “tip” and the right side is referred to as “base end”.

Hereinafter, the second embodiment of the indwelling needle assembly of the present invention will be described with reference to this figure. However, the difference from the above-described embodiment will be mainly described, and the description of the same matters will be omitted.
This embodiment is the same as the first embodiment except that the configuration of the blocking member is different.

  In the indwelling needle assembly 1B shown in FIG. 11, the closing member 9 is constituted by a single leaf spring 91c.

  In the leaf spring 91c, a central portion in the longitudinal direction is curved in a U shape on the distal end side, and a curved portion 92 is formed. The curved portion 92 is formed with a through hole 921 that penetrates in the thickness direction. The through hole 921 functions as an insertion hole through which the inner needle 4 is inserted in the assembled state.

  Further, the one end portion 93 and the other end portion 94 of the leaf spring 91 c are each bent toward the inside and are in contact with each other along the inclined surface of the outer peripheral portion 82 of the valve body 8.

  When the closing member 9 composed of such a leaf spring 91c is installed on the outer needle hub 3, the curvature of the curved portion 92 becomes larger than the natural state, and the one end portion 93 and the other end portion 94 approach each other. Thus, the outer peripheral portion 82 of the valve body 8 can be biased. As a result, the valve body 8 is sandwiched between the one end portion 93 and the other end portion 94, and in the extracted state, the slit 84 is closed. As described above, the blood passes over the valve body 8 and passes through the outer needle hub 3. It is possible to reliably prevent outflow from the base end of the.

  The indwelling needle assembly according to the present invention has been described above with reference to the illustrated embodiment. However, the present invention is not limited to this, and each part constituting the indwelling needle assembly may be any unit that can exhibit the same function. It can be replaced with the configuration of Moreover, arbitrary components may be added.

  Further, the indwelling needle assembly of the present invention may be a combination of any two or more configurations (features) of the above embodiments.

  In addition, the indwelling needle assembly of the present invention is not limited to those used by being inserted into blood vessels, and is applied to those used by being inserted into the abdominal cavity, thoracic cavity, lymphatic vessel, spinal canal, etc. You can also

  Further, the closing member is not limited to being configured by a pair of leaf springs having a U shape, and may be configured by, for example, one leaf spring having a U shape.

  In addition, ribs (engaging portions) that protrude toward the side and engage with the pressing member may be formed on the inner surface of each wall portion of the gripping member. The rib can prevent the pressing member from being displaced from the outer needle in the radial direction of the outer needle in the assembled state, that is, the pressing member is lifted upward.

  Further, the inner needle portion of the outer needle hub may be filled with a filler softer than the valve body around the valve body.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Indwelling needle assembly 11 Indwelling needle 12 Puncture needle 2 Outer needle 21 Lumen part (hollow part)
22 End opening 3 Outer needle hub 31 Flange 32 Bearing 34 Lumen 35 Tapered portion 36 Inner peripheral portion 361, 362 Groove 4 Inner needle 41 Needle tip 5 Inner needle hub 52 Opening 6 Pressing member 61 Main body portion 62 Finger hooking projection 63 Shaft 64 Press part 7 Holding member 71 Bottom plate 72, 73 Wall part 721, 731 Rib 75 Base end part 8 Valve body 81 Inner peripheral part 82 Outer peripheral part 83 Flange 84 Slit (opening / closing part)
9 closing member 91a, 91b, 91c leaf spring 92 bending part 921 through-hole 93 one end part 94 other end part 941 deformation part 20 tubular body

Claims (5)

An inner needle having a sharp needle tip at the tip;
An inner needle hub provided at the proximal end of the inner needle;
A hollow outer needle through which the inner needle is inserted;
An outer needle hub provided at a proximal end portion of the outer needle and having a lumen communicating with the inside of the outer needle;
The outer needle hub is installed so as to seal the inner cavity portion, has a convergent shape, and is composed of an elastic material having an openable opening / closing portion through which the inner needle is inserted together with the outer needle. The disc,
An occlusion member that is installed in the inner cavity portion of the outer needle hub, has elasticity, and closes the opening / closing portion with the valve body sandwiched from the distal end side when the inner needle is removed from the outer needle and the opening / closing portion. And
The indwelling needle assembly is characterized in that the closing member is composed of at least one leaf spring having a curved portion that is curved or bent on the distal end side. The outer periphery of the valve body is inclined with respect to the central axis of the outer needle,
The indwelling needle assembly according to claim 1, wherein the closing member abuts on an outer peripheral portion of the valve body and has an abutting portion along an inclined direction of the outer peripheral portion. The outer needle hub is capable of inserting a tube body from the proximal end side into the lumen portion with the inner needle removed.
When the tubular body is inserted into the inner cavity portion of the outer needle hub, the tubular body is configured so that the opening / closing section opens against the force of the closing member sandwiching the valve body. The indwelling needle assembly according to claim 1 or 2.   The indwelling needle assembly according to any one of claims 1 to 3, further comprising a long pressing member that is provided on the outer needle hub and presses the outer needle.   The indwelling needle assembly according to any one of claims 1 to 4, further comprising a gripping member provided on the inner needle hub and protruding in a distal direction from the inner needle hub.

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