JP2004073403A - Indwelling needle assembly - Google Patents

Indwelling needle assembly Download PDF

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Publication number
JP2004073403A
JP2004073403A JP2002236435A JP2002236435A JP2004073403A JP 2004073403 A JP2004073403 A JP 2004073403A JP 2002236435 A JP2002236435 A JP 2002236435A JP 2002236435 A JP2002236435 A JP 2002236435A JP 2004073403 A JP2004073403 A JP 2004073403A
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JP
Japan
Prior art keywords
needle
portion
inner needle
protector
inner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002236435A
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Japanese (ja)
Inventor
Takahito Murashita
村下 尊人
Original Assignee
Terumo Corp
テルモ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Terumo Corp, テルモ株式会社 filed Critical Terumo Corp
Priority to JP2002236435A priority Critical patent/JP2004073403A/en
Publication of JP2004073403A publication Critical patent/JP2004073403A/en
Application status is Pending legal-status Critical

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Abstract

To provide an indwelling needle assembly which can easily and surely cover a needle tip of an inner needle after use and has high safety in disposal processing or the like.
An indwelling needle assembly (1A) is installed on an inner needle (31), a protector (4) attached to the inner needle (31), a hollow outer needle into which the inner needle (31) can be inserted, and a proximal end of the outer needle. An outer needle hub 22 having a concave portion 221 on its inner peripheral surface and an engaging member 7 having a C-shaped portion 71 are provided. The engaging member 7 is connected to the protector 4 and the outer needle hub 22 by inserting the outer peripheral portion of the C-shaped portion 71 into the recess 221 and engaging with the outer needle hub 22 in the assembled state. When the inner needle 31 is moved in the proximal direction relative to the outer needle hub 22 from the assembled state, the protector 4 enters a second state in which the needle tip 311 of the inner needle 31 is covered. When the engagement member 7 is moved in the proximal direction relative to the engagement member 7, the engagement with the concave portion 221 is released by the deformation of the engagement member 7, and the protector 4 and the outer needle hub 22 are separated.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an indwelling needle assembly. More specifically, for example, the present invention relates to an indwelling needle assembly that is used by puncturing a blood vessel at the time of transfusion or blood collection.
[0002]
[Prior art]
When infusion is performed on a patient, an indwelling needle connected to the infusion line is punctured into a blood vessel of the patient and is indwelled to perform the infusion. Such an indwelling needle includes a hollow outer needle, an outer needle hub fixed to a 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. And an inner needle hub fixed to the proximal end.
[0003]
When puncturing this indwelling needle into a patient's blood vessel, the inner needle is inserted into the outer needle, and the puncturing operation is performed with the needle tip of the inner needle protruding from the tip of the outer needle. Then, 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 lumen of the inner needle, and flows into the transparent inner needle hub (flashback). Thereby, it can be confirmed that the inner needle has secured the blood vessel.
[0004]
When this flashback is confirmed, 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 holding 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.
[0005]
By the way, the inner needle pulled out from the outer needle is unnecessary and is provided for disposal.However, if the inner needle is discarded as it is, there is an accident that a discarding worker or the like accidentally points a finger or the like with the tip of the inner needle. May get up. In particular, since blood adheres and remains on the outer peripheral surface and inside of the inner needle, there is a possibility that infection may occur due to such a stab.
[0006]
Therefore, it is preferable that the used inner needle is stored in a hard and strong dedicated container that does not pierce the needle tip and discarded. However, such a dedicated container is always carried and carried to each patient. It is difficult from the point of view of business efficiency, so at present, used inner needles should be discarded in the opened packaging material containing the indwelling needle kit, Measures have been taken, such as putting on a cap and discarding it.
[0007]
However, even when wrapping the inner needle with a wrapping material or putting a cap on the inner needle, great care must be taken to prevent the operator's hand from being stuck with the needle of the inner needle. However, there is a problem in that disposal of the inner needle after use requires a great deal of trouble.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to provide an indwelling needle assembly that can easily and surely cover the needle tip of an inner needle after use, and that is highly safe in disposal processing and the like.
[0009]
[Means for Solving the Problems]
Such an object is achieved by the present invention described in the following (1) to (6). Further, the following (7) to (12) are preferable.
[0010]
(1) an inner needle having a sharp needle tip at the tip,
An inner needle hub installed on the proximal end side of the inner needle,
A first state mounted on the inner needle and movable in the longitudinal direction of the inner needle, and a second state covering the needle tip of the inner needle and restricting movement of the inner needle in the longitudinal direction. And a protector
A hollow outer needle into which the inner needle can be inserted,
An outer needle hub installed on the proximal end side of the outer needle and having a concave portion on the inner peripheral surface thereof,
It has at least one engaging portion that can be inserted into the concave portion, and a hollow portion formed on the inner peripheral side of the engaging portion, and can maintain a state in which the engaging portion is engaged with the concave portion. And an engagement member capable of releasing the engagement of the engagement portion with the concave portion by deforming the engagement portion so as to be displaced toward the hollow portion side,
In the assembled state, the protector is located on the proximal end side of the inner needle in the first state, and the protector and the outer needle hub are connected by the engagement of the engagement portion with the recess. Has become
When the inner needle hub is moved in the proximal direction relative to the outer needle hub from the assembled state, the protector moves in the distal direction relative to the inner needle to change the tip of the inner needle. In the second state of covering, when the inner needle hub is further moved in the proximal direction relative to the outer needle hub, the engagement member is deformed, whereby the engagement of the engagement portion with the concave portion is performed. The indwelling needle assembly is released, and the protector and the outer needle hub are separated.
[0011]
(2) The indwelling needle assembly according to the above (1), wherein the concave portion is formed over the entire circumference along the circumferential direction.
[0012]
(3) The engaging member is a member having a substantially C-shaped C-shaped portion that can be deformed so that its outer diameter is reduced, and an outer peripheral portion of the C-shaped portion constitutes the engaging portion. The indwelling needle assembly according to the above (1) or (2).
[0013]
(4) The engaging member includes at least two elastic pieces arranged at intervals along a circumferential direction, and a convex portion formed on an opposite side to a root of the elastic piece and protruding toward an outer peripheral side. The indwelling needle assembly according to the above (1) or (2), wherein the projections constitute the engagement portions, and the projections are deformable so as to approach each other.
[0014]
(5) The protector is made of a metal material, and has a plate-shaped brake portion formed with a hole through which the inner needle can pass, and the brake portion so that an inclination angle of the brake portion with respect to the inner needle is reduced. And a biasing means for biasing the inner needle, the tilting angle of the brake part with respect to the inner needle being changed by contacting the inner needle in the first state. With an inner needle contact part having a function of preventing
The protector is moved from the first state toward the distal end relative to the inner needle, and the inner needle contact portion is separated from the inner needle by passing through the needle point and separating from the inner needle. The biasing means deforms the inclination angle of the brake portion with respect to the inner needle so as to be smaller than that in the first state to be in the second state, whereby the inner peripheral portion of the hole and the inner needle are 5. The method according to any one of (1) to (4) above, wherein a frictional force between the inner needle and the outer peripheral surface is generated or increased to prohibit relative movement of the inner needle along the longitudinal direction. Indwelling needle assembly.
[0015]
(6) The protector has a protector body having an inner needle passage through which the inner needle can be inserted, a first position in which the inner needle can be inserted into the inner needle passage, and a passage of the inner needle through the needle tip. A shutter member that can be displaced to a second position
The shutter member includes a first portion, and a second portion present through a connecting portion to the first portion, and an end of the first portion opposite to the connecting portion, The distance between the end of the second portion and the end opposite to the connecting portion is configured to change between the first posture and the second posture,
The device according to any one of the above (1) to (4), further comprising a detachment preventing means for preventing the protector from detaching from the needle tip of the inner needle while the protector covers the needle tip of the inner needle. Indwelling needle assembly.
[0016]
(7) The indwelling needle assembly according to any one of (1) to (6), wherein the engagement member has a connecting portion to the protector.
[0017]
(8) The indwelling needle assembly according to any one of (1) to (6), wherein the engagement member is integrated or fixed to the protector.
[0018]
(9) The indwelling needle assembly according to (5), wherein the inner needle contact portion is made of a resin material.
[0019]
(10) The indwelling needle assembly according to the above (5) or (9), wherein the urging means is a plate-shaped member continuous from the brake portion, and exerts an urging force by its elastic force.
[0020]
(11) The above-mentioned (6), wherein the shutter member is configured to change the distance by elastically deforming at least a part of the first portion and / or the second portion. Indwelling needle assembly.
[0021]
(12) The indwelling needle assembly according to the above (6) or (11), wherein the detachment preventing means is configured by a linear or band-shaped connecting member that connects the inner needle hub and the protector.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an indwelling needle assembly of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
[0023]
<First embodiment>
FIG. 1 is a longitudinal sectional view showing an assembled state of an indwelling needle assembly according to a first embodiment of the present invention, and FIG. 2 shows a state in which a protector of the indwelling needle assembly shown in FIG. FIG. 3 is a longitudinal sectional view showing a first state of the protector in the indwelling needle assembly shown in FIG. 1, and FIG. 4 is a longitudinal sectional view showing a second state of the protector in the indwelling needle assembly shown in FIG. FIG. 5 is a plan view showing an engaging member in the indwelling needle assembly shown in FIG. 1, and FIG. 6 is a sectional view taken along line VI-VI in FIG. In the following, for convenience of explanation, the left side in FIGS. 1 to 4 is referred to as a “proximal end” and the right side is referred to as a “distal end”.
[0024]
The indwelling needle assembly 1A shown in these figures includes an outer needle and an inner needle, and particularly constitutes an infusion indwelling needle assembly, and includes an outer needle 21 which is an indwelling needle and an outer needle. An outer needle 2 with a hub constituted by an outer needle hub 22 provided on the proximal end side of the inner needle 21; an inner needle (needle tube) 31 used by being inserted into the outer needle 21; An inner needle 3 with a hub constituted by an inner needle hub 32 provided on the side, the protector 4 of the first embodiment mounted on the inner needle 31, and an engagement member 7 are provided. Hereinafter, the configuration of each unit will be described.
[0025]
The outer needle 21 preferably has a hollow shape and has a certain degree of flexibility. Although the constituent material of the outer needle 21 is not particularly limited, for example, various soft resins such as ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferable.
[0026]
The distal end of the outer needle 21 preferably has a tapered shape in which the outer diameter gradually decreases toward the distal end in order to easily puncture the living body with low invasiveness.
[0027]
An outer needle hub 22 is fixed to the proximal end of the outer needle 21 in a liquid-tight manner by, for example, fitting, caulking, fusion (heat fusion, high-frequency fusion, or the like), bonding with an adhesive, or the like. 21 communicates with the inside of the outer needle hub 22. The outer needle hub 22 is a substantially cylindrical member, and has a tapered shape whose outer diameter and inner diameter gradually increase toward the base end.
[0028]
The outer needle hub 22 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured.
[0029]
On the inner peripheral surface of the outer needle hub 22, a concave portion 221 with which an engaging member 7 described later can be formed is formed. The recess 221 is formed over the entire circumference along the circumferential direction.
[0030]
The inner needle 31 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 311 is formed at the tip of the inner needle 31. The shape of the needle tip 311 is not particularly limited, and in the present embodiment, has a blade surface inclined at a predetermined angle with respect to the axis of the inner needle 31.
[0031]
The inner needle 31 is used in a state where it is inserted into the lumen of the outer needle 21, that is, the state shown in FIG. Hereinafter, the state illustrated in FIG. 1 is referred to as an “assembled state”.
[0032]
The length of the inner needle 31 is such that at least the needle tip 311 protrudes from the distal end opening 211 of the outer needle 21 in the assembled state.
[0033]
The proximal end of the inner needle 31 is fixed to the distal end of the inner needle hub 32 in a liquid-tight manner by, for example, fitting, caulking, fusing, bonding with an adhesive, or the like. It communicates with the internal space of the hub 32. The inner needle hub 32 is formed of a substantially cylindrical hollow member.
[0034]
The inner needle hub 32 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 311 secures a blood vessel, it is possible to visually check the flashback of the blood flowing through the inner needle 31.
[0035]
A ventilation filter 321 is provided at an opening at the base end of the inner needle hub 32 so as to cover the opening. The ventilation filter 321 has a property of transmitting gas but blocking liquid.
[0036]
The constituent materials of the outer needle hub 22 and the inner needle hub 32 are not particularly limited. For example, polyethylene, polypropylene, polybutadiene, polyolefin such as ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl Various resin materials such as methacrylate, polycarbonate, polyamide, polyester such as polyethylene terephthalate and polybutylene terephthalate, acrylic resin, ABS resin, AS resin, ionomer, polyacetal, polyphenylene sulfide, and polyether ether ketone are exemplified.
[0037]
The protector 4 is mounted on the inner needle 31 and is housed in the inner space of the outer needle hub 22 in an assembled state.
[0038]
The protector 4 is in a first state (a state shown in FIGS. 1 and 3) that is relatively movable along the longitudinal direction (axial direction) of the inner needle 31 and a state in which the needle tip 311 of the inner needle 31 is covered. Thus, the inner needle 31 can be deformed into a second state (the posture shown in FIGS. 2 and 4) in which relative movement along the longitudinal direction is prohibited.
[0039]
The protector 4 includes a protector body 5 formed by deforming (bending) a plate-like member made of a metal material, and a plastic member 6 fixed (fixed) to the protector body 5. I have.
[0040]
As shown in FIG. 3, the protector main body 5 is provided on a first portion (brake portion) 51 in which a first hole 511 is formed, and on a proximal end side (needle base side) of the first portion 51. , A second part 52 in which a second hole 521 is formed, and a third part 53 connecting the other ends of the first part 51 and the second part 52.
[0041]
That is, in FIG. 3, the first portion 51, the second portion 52, and the third portion 53 are formed to have a substantially “U” shape (or a substantially “C” shape) as a whole. Are located.
[0042]
The inner needle 31 penetrates (inserts) the first hole 511 and the second hole 521. The shape of the first hole 511 is preferably circular.
[0043]
In addition, the protector body 5 has a fourth portion 54 provided to extend from one end of the first portion 51 to the distal end side. A long hole (or notch) 541 is formed in a portion on the distal end side of the fourth portion 54. In the first state, when the inner needle 31 is inserted into the elongated hole 541, the fourth portion 54 is positioned so as to intersect the inner needle 31 in a posture inclined with respect to the inner needle 31.
[0044]
Such a protector body 5 is made of a metal material. Thereby, in the second state, the frictional force between the inner surface of the first hole 511 and the outer peripheral surface of the inner needle 31 becomes sufficiently large, and the braking action of the first portion 51 as the brake portion is reliably exhibited. Is done. The metal material forming the protector body 5 is not particularly limited, and examples thereof include stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy, copper or a copper-based alloy.
[0045]
In the present embodiment, the protector main body 5 is configured such that each part thereof is integrally formed. However, in the present invention, the protector main body 5 may be configured by two or more components.
[0046]
A plastic member 6 is fixed to the fourth portion 54 of the protector body 5. The plastic member 6 is a case-shaped member that forms a needle tip storage space 61 between the plastic member 6 and the fourth portion 54. As shown in FIG. 4, in the second state, the needle point 311 of the inner needle 31 is stored in the needle point storage space 61. Thus, it is possible to avoid the danger of the operator accidentally sticking the needle tip 311 into the hand or the like.
[0047]
The plastic member 6 has an inner needle contact portion 62 that contacts the outer peripheral surface of the inner needle 31 near the elongated hole 541 in the first state. As will be described later, the plastic member 6 is urged by the elasticity (springiness) of the protector body 5 in a direction to rotate clockwise in FIG. 3, and the urging force causes the first state. At this time, the inner needle contact portion 62 is in a state of being pressed against the outer peripheral surface of the inner needle 31.
[0048]
The plastic member 6 including the inner needle contact portion 62 is made of a resin material (synthetic resin material). Thereby, in the first state, the frictional resistance between the inner needle contact portion 62 and the outer peripheral surface of the inner needle 31 is reduced, and the sliding resistance of the protector 4 with respect to the inner needle 31 is reduced. As a result, in the first state, the protector 4 can move smoothly (with a relatively small operating force) along the longitudinal direction (axial direction) of the inner needle 31.
[0049]
The resin material constituting the plastic member 6 (the inner needle contact portion 62) is not particularly limited, but may be any of various types such as polyethylene, polypropylene, polyurethane, polystyrene, polycarbonate, polyester, ABS resin, AS resin, fluororesin, and polyacetal. A resin material may be used.
[0050]
In the assembled state, such a protector 4 is located at the proximal end (the proximal end) of the inner needle 31 in the first state, as shown in FIG.
[0051]
In the first state, the inner needle 31 penetrates the protector 4 by passing through the second hole 521, the first hole 511, and the long hole 541, and abutting on the inner needle contact portion 62.
[0052]
The protector 4 can be displaced (deformed) from the first state to the second state shown in FIG. 4 to cover the needle tip 311. In the second state, the angle between the first part 51 and the third part 53 in the protector main body 5 is smaller than in the first state. That is, the protector 4 is deformed so that the first portion 51 and the third portion 53 are closed (the first portion 51 approaches the third portion 53), so that the protector 4 is in the first state. Displacement (deformation) to the state of 2.
[0053]
Such displacement (deformation) from the first state to the second state is caused by a part of the elasticity (elastic force) of the first part 51 and the third part 53 in the protector body 5. ing.
[0054]
That is, in a natural state in which no external force is applied to the protector 4 (a state in which the protector 4 is not attached to the inner needle 31), the angle formed between the first portion 51 and the third portion 53 is as shown in FIG. The protector 4 is configured to open the first portion 51 and the third portion 53 from such a natural state (to prevent the first portion 51 from moving away from the third portion 53). ) It is attached to the inner needle 31 in a deformed (elastically deformed) state.
[0055]
With such a configuration, when the protector 4 is attached to the inner needle 31, the first portion 51 has an inclination angle (the angle indicated by θ in FIG. 3 and θ ′ in FIG. 4) with respect to the inner needle 31. It is biased in such a direction as to be smaller. That is, a part of the first part 51 and the third part 53 in the protector 4 is configured such that the elasticity of the first part 51 and the third part 53 reduces the inclination of the first part 51 with respect to the inner needle 31 so that the first part 51 becomes smaller. It is a biasing means for biasing.
[0056]
Here, the inclination angle of the first portion 51 with respect to the inner needle 31 can be represented by two sizes depending on which side of the angle formed by the first portion 51 and the inner needle 31 is selected. In the specification, the “inclination angle of the first portion 51 with respect to the inner needle 31” refers to an angle (smaller angle) that becomes less than 90 ° in the second state. That is, in the present embodiment, the angles are indicated by θ in FIG. 3 and θ ′ in FIG. Hereinafter, this angle is referred to as a “first portion inclination angle”.
[0057]
As shown in FIG. 3, in the first state, since the inner needle contact portion 62 is in contact with the outer peripheral surface of the inner needle 31, the first portion inclination angle is increased by the urging force of the urging means. The protector 4 is prevented from being deformed so as to be smaller.
[0058]
Therefore, in the first state, a gap is formed between the first hole 511 and the inner needle 31, and the gap between the inner peripheral surface of the first hole 511 and the outer peripheral surface of the inner needle 31 is formed. The frictional force between them is substantially inactive or relatively small. That is, in the first state, the first portion 51 does not generate a braking action.
[0059]
As described above, the inner needle contact portion 62 prevents the first portion inclination angle from being reduced (changed) by contacting the inner needle 31 in the first state, and the first portion is in contact with the inner needle 31. 51 has the function of retaining the braking action.
[0060]
In the first state, the inner needle contact portion 62 is pressed against the outer peripheral surface of the inner needle 31 by the urging force of the urging means. Since the portion 62 is made of a resin material, the protector 4 can move smoothly (with a relatively small operating force) with respect to the inner needle 31.
[0061]
From the first state shown in FIG. 3, the protector 4 is moved in the distal direction relative to the inner needle 31, and when the inner needle contact portion 62 passes through the needle tip 311, the inner needle contact portion 62 It separates (separates) from the inner needle 31. As a result, the protector 4 is released from the brake operation reserved state, and is elastically displaced (deformed) to the second state shown in FIG. 4 by the urging force of the urging means.
[0062]
In the second state, the protector 4 causes the first part 51 to rotate clockwise in FIGS. 3 and 4 with respect to the third part 53 (the inner needle 31), as compared to the first state. Is displaced (deformed). As a result, the first part inclination angle is smaller than that in the first state, and θ ′ <θ is satisfied.
[0063]
Accordingly, the fourth portion 54 and the plastic member 6 are also displaced (rotated) with respect to the third portion 53 (the inner needle 31), and the tip of the needle tip 311 is covered with the plastic member 6. It is in a state where it has been broken.
[0064]
In such a second state, the first portion 51 of the protector 4 functions as a brake for the inner needle 31, so that the relative movement of the protector 4 along the longitudinal direction of the inner needle 31 is prevented. Regulated (blocked). That is, the first portion inclination angle becomes smaller than that in the first state by the urging force of the urging means, so that the inner peripheral portion (inner peripheral surface) of the first hole 511 becomes the outer peripheral surface of the inner needle 31. And the frictional force between the inner peripheral portion (inner peripheral surface) of the first hole 511 and the outer peripheral surface of the inner needle 31 is generated or increased. This frictional force acts on the protector 4 as a braking force, and regulates (prevents) the movement of the protector 4 along the longitudinal direction of the inner needle 31.
[0065]
With such a configuration, when the needle point 311 is stored in the needle point storage space 61 (in the second state), the needle point 311 does not protrude beyond the protector 4.
[0066]
Note that the inner diameter of the first hole 511 is usually preferably larger by about 0.01 to 1 mm than the outer diameter of the inner needle 31, and more preferably larger by about 0.05 to 0.2 mm.
[0067]
In addition, the first hole 511 may be one in which a part in the circumferential direction is missing (such as a C-shaped one) (the same applies to the second hole 521).
[0068]
The shape of the second hole 521 is not limited to a circle as long as it can slide with respect to the inner needle 31, but if the shape is circular, the inner diameter of the second hole 521 reduces the sliding resistance in the first state. From the viewpoint, it is preferable that the outer diameter of the inner needle 31 is larger by about 0.05 to 1 mm.
[0069]
In addition, the portion near the second hole 521 (the contact surface with the inner needle 31) is made of the above-described resin material, or the contact surface with the inner needle 31 is smoothed by bending or the like. Is also good. Thereby, the frictional force between the inner peripheral surface of the second hole 521 and the outer peripheral surface of the inner needle 31 is reduced. Therefore, the sliding resistance of the protector 4 with respect to the inner needle 31 in the first state can be further reduced, and as a result, the operation of moving the protector 4 in the distal direction relative to the inner needle 31 (the needle with the protector 4). The operation of covering the tip 311) can be performed more easily and smoothly.
[0070]
Although the preferred value of the thickness of the plate-like member (particularly, the first portion 51) forming the protector body 5 varies depending on its constituent material, the outer diameter of the inner needle 31, and the like, it is usually 0.05 to 2 mm. It is preferably about 0.06 to 0.2 mm. In the above range, when the thickness is relatively thick, the braking force acting on the protector 4 and the protection of the needle tip 311 in the second state are particularly excellent, and when the thickness is relatively thin, Workability and ease of sliding with respect to the inner needle 31 in the first state are particularly excellent.
[0071]
In such a protector 4, when the distal end portion (such as the plastic member 6) is pressed in the proximal direction in the second state, the protector 4 acts so that the first portion inclination angle θ ′ becomes smaller. As a result, the frictional force between the inner surface of the first hole 511 and the outer peripheral surface of the inner needle 31 (braking force acting on the protector 4) further increases, opposing the pressing force, and moving the protector 4. Regulations (prevention) can be performed more reliably, and safety is high.
[0072]
Further, in the illustrated configuration, even when the protector 4 is slightly moved in the proximal direction due to a particularly strong pressing force, the needle tip 311 abuts on the inner surface of the plastic member 6. Does not protrude beyond the protector 4, and higher safety is obtained.
[0073]
The protector 4 of the present embodiment further includes cover portions 56, 56 that cover the plastic member 6 (a portion near the inner needle contact portion 62).
[0074]
The cover portions 56 extend from both sides of the fifth portion 55 provided to extend in the distal direction from one end of the second portion 52 in the other end direction (upward in FIG. 3). This is a plate-like portion provided as described above.
[0075]
The covers 56 cover the first portion 51, the fourth portion 54, the fifth portion 55, and the plastic member 6 from the side.
[0076]
By providing such cover portions 56, 56, the plastic member 6 or the like cannot be touched by a finger or the like, and therefore, it is possible to prevent the operation of pulling the plastic member 6 in the distal direction. Can be. Therefore, even when the protector 4 covering the needle tip 311 is intentionally detached from the inner needle 31, the protector 4 is more reliably prevented from detaching from the needle tip 311 of the inner needle 31. And particularly high security can be obtained.
[0077]
Such an indwelling needle assembly 1A has the engaging member 7 that engages with the concave portion 221 formed on the inner peripheral surface of the outer needle hub 22 in the assembled state.
[0078]
As shown in FIGS. 5 and 6, the engagement member 7 has a C-shaped portion 71 having a substantially C-shape. That is, the C-shaped portion 71 is formed in a ring shape with a part missing, and a hollow portion 73 is formed on the inner peripheral side. As shown in FIG. 3, the protector 4 is in contact with or close to the distal end side of the C-shaped portion 71.
[0079]
The outer diameter of the C-shaped portion 71 in the natural state is substantially the same as or slightly larger than the inner diameter of the outer needle hub 22 in the concave portion 221. In the assembled state, the outer peripheral portion of the C-shaped portion 71 of the engaging member 7 ( The engaging portion) is inserted into the recess 221. In this state, the outer periphery of the C-shaped portion 71 is engaged with the concave portion 221, so that the protector 4 and the outer needle hub 22 are connected via the engaging member 7.
[0080]
Further, the engaging member 7 has a connecting portion 72 to the protector 4 on the tip side of the C-shaped portion 71. As shown in FIGS. 5 and 6, the connecting portion 72 has a plate shape and is formed with a gap 74 between the connecting portion 72 and the C-shaped portion 71. A notch 721 through which the inner needle 31 is inserted (inserted) is formed in the connecting portion 72.
[0081]
The engaging member 7 is connected to the protector 4 by inserting the second portion 52 of the protector body 5 into the gap 74 and sandwiching the second portion 52 between the C-shaped portion 71 and the connecting portion 72. . By providing such a connecting portion 72, manufacture (assembly) of the indwelling needle assembly 1A can be easily performed, and the protector 4 is prevented from moving in the outer needle hub 22 in the assembled state. can do.
[0082]
Note that the engagement member 7 may not have the connecting portion 72, and may be configured such that the protector 4 simply contacts the distal end side of the C-shaped portion 71.
[0083]
In the state where the outer peripheral portion of the C-shaped portion 71 is engaged with the concave portion 221, even if a certain amount of force acts in the proximal direction, the engaging member 7 opposes the force, and the outer needle It does not move proximally with respect to hub 22. Then, when the magnitude of the force in the proximal direction acting on the engaging member 7 exceeds a certain level, the outer periphery of the C-shaped portion 71 is deformed (elastically deformed) so that the diameter of the C-shaped portion 71 is reduced. The support member 71 is displaced toward the hollow portion 73, whereby the engagement of the support portion 71 with the concave portion 221 on the outer peripheral portion is released, and the engagement member 7 can move in the proximal direction with respect to the outer needle hub 22 (FIG. 4). reference).
[0084]
Note that a tapered portion 222 whose inner diameter gradually decreases in the proximal direction is formed at a proximal end portion of the concave portion 221. Thereby, when the magnitude of the force in the proximal direction acting on the engaging member 7 becomes a certain level or more, the outer peripheral portion of the C-shaped portion 71 slides out of the concave portion 221 while sliding on the tapered portion 222. , C-shaped portion 71 is easily reduced in diameter. Accordingly, the engagement of the outer periphery of the C-shaped portion 71 with the concave portion 221 is more smoothly released.
[0085]
Next, an example of a method of using the indwelling needle assembly 1A will be described in detail.
[1] With the indwelling needle assembly 1A in the assembled state, the inner needle 31 and the outer needle 21 are punctured into a blood vessel (vein or artery) of the patient while holding the inner needle hub 32 and the like by hand.
[0086]
[2] When the needle tip 311 of the inner needle 31 is punctured into a blood vessel, the blood flows backward in the inner needle 31 in the proximal direction due to the internal pressure (blood pressure) of the blood vessel, and is introduced into the inner needle hub 32, and the internal The flashback can be visually recognized through the inner needle hub 32 having visibility. This makes it possible to know that the needle tip 311 of the inner needle 31 has secured a blood vessel.
[0087]
In addition, with the inflow of the blood, the air in the inner needle hub 32 is discharged through the ventilation filter 321, but the blood cannot pass through the ventilation filter 321 and does not leak to the outside.
[0088]
[3] When the inner needle 31 and the outer needle 21 are further advanced in the distal direction by a small distance, the distal opening 211 of the outer needle 21 is inserted into the blood vessel. Thereby, the outer needle 21 secures a blood vessel.
[0089]
[4] While holding down the outer needle 21 placed in the blood vessel by hand, grasp the inner needle hub 32 with the other hand and pull in the proximal direction. Thereby, the inner needle 31 is withdrawn from the outer needle 21. At this time, since the protector 4 is connected to the outer needle hub 22 via the engaging member 7, the protector 4 remains on the outer needle hub 22. That is, the protector 4 moves relatively toward the distal end with respect to the inner needle 31.
[0090]
[5] When the inner needle hub 32 is further pulled in the proximal direction, as described above, the needle tip 311 of the inner needle 31 passes through the inner needle contact portion 62, and the brake operation is retained by the inner needle contact portion 62. Is released. Thereby, the protector 4 is elastically deformed (by its own elasticity) to be in the second state.
[0091]
When the protector 4 enters the second state, the protector 4 stops by the braking action of the first portion 51 with respect to the inner needle 31 before the needle tip 311 passes through the first hole 511. As a result, the protector 4 is prohibited (prevented) from moving along the longitudinal direction of the inner needle 31 and maintains a state in which the needle tip 311 of the inner needle 31 is covered (stored).
[0092]
[6] When the inner needle hub 32 is further pulled in the proximal direction from the state where the protector 4 is in the second posture, the pulling force acts on the engaging member 7 via the protector 4, and this force causes The engagement of the outer periphery of the C-shaped portion 71 with the concave portion 221 is released (see FIG. 4). As a result, the connection between the protector 4 and the outer needle hub 22 is released, and the protector 4 is separated from the outer needle hub 22 and remains at the tip of the inner needle 31 (see FIG. 2).
[0093]
[7] A connector or the like (not shown) of an infusion set is quickly connected to the outer needle hub 22 of the outer needle 2 with the hub from which the inner needle 31 has been removed, and administration of the infusion is started according to a standard method.
[0094]
After the inner needle 31 is withdrawn from the outer needle 21 in this manner, the inner needle 3 with a hub becomes unnecessary, and is therefore disposed of.
[0095]
As described above, according to this indwelling needle assembly 1A, the needle tip 311 of the hub inner needle 3 removed from the hub outer needle 2 is stored in the protector 4, and in particular, the needle tip 311 is Since the protector 4 does not protrude from the tip of the inner needle 31 and the protector 4 does not come off from the inner needle 31, it is possible to reliably prevent an accident such as a person who performs disposal processing accidentally stabbing a finger or the like with the needle tip 311. .
[0096]
Also, in the indwelling needle assembly 1A, the provision of the engaging member 7 allows the inner needle 3 with the hub (the inner needle hub 32) to move relative to the outer needle 2 with the hub (the outer needle hub 22) in the proximal direction. The protector 4 automatically moves to a position covering the needle tip 311 of the inner needle 31 by performing an operation of moving the inner needle 31 from the inside of the outer needle 21. No separate operation for covering the needle tip 311 is required. Further, by further pulling the inner needle hub 32 in the proximal direction from the state where the protector 4 covers the needle tip 311 of the inner needle 31, the engagement of the engaging member 7 with the outer needle hub 22 is released, and the protector 4 is removed. It can be separated from the outer needle hub 22.
[0097]
At this time, the engaging member 7 reliably maintains the connected state between the protector 4 and the outer needle hub 22 until the protector 4 moves to a position covering the needle tip 311 of the inner needle 31, and thereafter, the engaging member 7 is easily operated. Thus, the engagement with the outer needle hub 22 can be released, and the protector 4 can be separated from the outer needle hub 22 smoothly and easily.
[0098]
Thus, in the indwelling needle assembly 1A, extremely excellent operability is obtained, and the needle tip 311 of the inner needle 31 can be reliably covered (stored) with the protector 4 by an extremely easy operation.
[0099]
<Second embodiment>
FIG. 7 is a longitudinal sectional view showing an assembled state of the indwelling needle assembly according to the second embodiment of the present invention. FIG. 8 shows a state in which the protector of the indwelling needle assembly shown in FIG. FIG. 9 is a perspective view showing a portion (engaging member) on the distal end side of the protector in the indwelling needle assembly shown in FIG.
[0100]
Hereinafter, a second embodiment of the indwelling needle assembly of the present invention will be described with reference to these drawings, but the description will focus on differences from the above-described embodiment, and description of similar items will be omitted.
[0101]
This embodiment is the same as the first embodiment except that the configurations of the protector and the engagement member are different.
[0102]
The protector 8 in the indwelling needle assembly 1B of the present embodiment includes a protector body 81 composed of a substantially cylindrical (cylindrical) member, and a shutter member 85.
[0103]
An inner needle passage 82 through which the inner needle 31 is inserted is formed at the center of the protector main body 81 so as to penetrate from the base end to the distal end of the protector main body 81. The cross-sectional shape of the inner needle passage 82 is circular, and the inner diameter of the inner needle passage 82 is set to a value slightly larger than the outer diameter of the inner needle 31.
[0104]
Further, inside the protector main body 81, that is, in the middle of the inner needle passage 82, a space 83 in which the inner needle passage 82 is enlarged is formed. In this space 83, a shutter member 85 described later is stored.
[0105]
In the assembled state shown in FIG. 7, the distal end portion of the protector main body 81 is inserted into the inside (lumen) of the outer needle hub 22, and the proximal end portion of the protector main body 81 is inserted in the outer needle hub 22. It is exposed from.
[0106]
The constituent material of the protector body 81 is not particularly limited, and for example, the same materials as the constituent materials of the outer needle hub 22 and the inner needle hub 32 can be used.
[0107]
In the illustrated configuration, the protector main body 81 is formed integrally, but is not limited thereto, and may be formed by fixing a plurality of members. In this case, in a state where the protector main body 81 is separated into a plurality of members, the shutter member 85 can be housed (installed) inside (in the space 83) and can be easily manufactured.
[0108]
The shutter member 85 has a function of preventing the needle tip 311 from passing beyond the shutter member 85 in the distal direction when the needle tip 311 of the inner needle 31 is located on the base end side of the shutter member 85.
[0109]
The shutter member 85 is formed by bending a band-shaped plate member having elasticity (which is elastically deformed) into a substantially V shape, and includes a first portion 851, a second portion 852, A bent portion (connecting portion) 853 that connects the distal ends of the first portion 851 and the second portion 852 is provided.
[0110]
This shutter member 85 has an angle formed between the first portion 851 and the second portion 852, that is, the vicinity of the base end of the first portion 851 (the end opposite to the bent portion 853); By changing the distance between the vicinity of the base end of the second portion 852 (the end opposite to the bent portion 853), the first posture in which the inner needle 31 can be inserted (penetrated) through the inner needle passage 82 (FIG. 7) and a second posture (a posture shown in FIG. 8) for preventing the inner needle 31 from passing through the needle tip 311.
[0111]
That is, as shown in FIG. 7, when the inner needle 31 is inserted (penetrated) into the inner needle passage 82 from the space 83 to the distal end direction, the shutter member 85 is in contact with the first portion 851 around the bent portion 853. The second portion 852 is stored in the space 83 in a compressed state so as to approach each other, and is in the first posture. Note that, in this state, the vicinity of the base end of the first portion 851 (the end opposite to the bent portion 853) abuts on the upper part of the space 83, and the vicinity of the base end of the second portion 852 (the bent portion 853 and The opposite end) is in contact with the outer peripheral surface of the inner needle 31. In this state (first state), the protector 8 is movable in the longitudinal direction of the inner needle 31.
[0112]
When the inner needle hub 32 is moved in the proximal direction with respect to the protector 8 from this state, the needle point 311 of the inner needle 31 moves in the proximal direction and passes through the space 83. At this time, as shown in FIG. 8, the compressed state of the shutter member 85 is released, and the first portion 851 and the second portion 852 move away from each other about the bent portion 853 by their own elastic force. The vicinity of the base end of the first portion 851 abuts on the upper portion of the space 83 while the vicinity of the base end of the second portion 852 abuts on the bottom of the space 83, and the second posture It becomes. In this state, the shutter member 85 prevents the needle tip 311 from moving (passing) in the tip direction.
[0113]
The width of the shutter member 85 (the length in the direction perpendicular to the paper surface in FIGS. 7 and 8) is preferably set to be larger than the inner diameter of the inner needle passage 82, but is not particularly limited. . When a force in the proximal direction is applied to the protector 8 in the state shown in FIG. 8, the inner needle 31 should move further in the distal direction from the state where the needle tip 311 is in contact with the proximal surface of the shutter member 85. Will be blocked. That is, even if the inner needle 31 attempts to move in the distal direction together with the shutter member 85 in a state where the needle tip 311 is in contact with the base end surface of the shutter member 85, the shutter member 85 does not enter the inner needle passage 82. Therefore, further movement in the tip direction is prevented (prevented).
[0114]
The shutter member 85 having such a configuration is excellent in a restoring force from the first posture in the compressed state to the second posture having a substantially original shape. For this reason, the shutter member 85 is prevented from being bent, so that even when the indwelling needle assembly 1B is stored for a long period of time, the shutter member 85 is securely in the second posture, and the distal end of the needle tip 311 is directed toward the distal end. A sufficient effect of preventing (preventing) the movement to the surface can be exhibited.
[0115]
The thickness of the shutter member 85 is not particularly limited, but is preferably, for example, about 0.04 to 0.2 mm, and more preferably about 0.08 to 0.1 mm.
[0116]
The constituent material of the shutter member 85 may be any material as long as it can block the passage of the needle tip 311. For example, polyethylene, polypropylene, polybutadiene, polyolefin such as ethylene-vinyl acetate copolymer, polyvinyl chloride, Polyester such as polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylic resin, ABS resin, AS resin, ionomer, polyacetal, various resin materials such as polyphenylene sulfide, polyetheretherketone, stainless steel Various metal materials such as steel, aluminum alloy, copper or copper-based alloy, titanium or titanium alloy, and the like can be given.
[0117]
Further, it is preferable that a lubricant is applied to the surface of such a shutter member 85. Thereby, frictional resistance (sliding resistance) between the outer peripheral surface of the inner needle 31 and the vicinity of the proximal end of the second portion 852 is reduced, and the inner needle 31 moves more smoothly in the proximal direction of the protector 8. be able to. As the lubricant, for example, silicone, silicone oil, grease, various oils, surfactants and the like can be used.
[0118]
In the present embodiment, the vicinity of the base end of the first portion 851 is configured to simply contact the inner surface of the space 83. However, the present invention is not limited to this. It may be fixed by a method such as insertion, fusion, or bonding with an adhesive.
[0119]
With such an indwelling needle assembly 1B, with the protector 8 housed (covered) with the needle tip 311 of the inner needle 31, detachment preventing means for preventing the protector 8 from detaching from the needle tip 311 of the inner needle 31. And a connecting member 10 for connecting the inner needle hub 32 and the protector 8.
[0120]
The connecting member 10 is a linear or band-like string-like member. One end of the connecting member 10 is fixed (fixed) to the protector body 81, and the other end of the connecting member 10 is fixed (fixed) to the inner needle hub 32.
[0121]
The constituent material of the connecting member 10 is not particularly limited, and examples thereof include resin materials such as polyolefins such as polyethylene, polyvinyl chloride, polyurethane, polyesters such as polybutylene terephthalate, fiber materials such as cotton, and various metal materials. Can be
[0122]
Such a connection member 10 can be used as a single fiber or an aggregate of fibers (for example, a single fiber twisted, a single fiber woven, or the like), a nonwoven fabric, a film, or the like made of the above materials. . Further, it is preferable that the connecting member 10 does not substantially expand or contract, or has little expansion and contraction.
[0123]
In the assembled state of the indwelling needle assembly 1B shown in FIG. 7 (when the protector 8 is located near the base end of the inner needle 31), the connecting member 10 is in a relaxed state. Then, as shown in FIG. 8, in a state where the protector 8 stores (covers) the needle tip 311 of the inner needle 31, the connecting member 10 is in a straightened state. Thus, in this state, even if the protector 8 is to be moved in the distal direction with respect to the inner needle 31, the protector 8 is prevented from coming off (separating) from the needle point 311 of the inner needle 31 due to the tension of the connecting member 10. Is done. That is, in this state (second state), in the protector 8, the movement of the inner needle 31 in the longitudinal direction of the protector 8 is restricted (blocked) in both the distal direction and the proximal direction by the connecting member 10 and the shutter member 85.
[0124]
The length of the connecting member 10 is such that when the connecting member 10 is tensioned, the needle tip 311 is located on the base end side of the shutter member 85 so that the shutter member 85 is reliably in the second position and the distal end of the inner needle 31 The length is set so that the portion is not removed from the inner needle passage 82.
[0125]
The inner needle hub 32 or the protector 8 may be provided with a storage portion for storing the connecting member 10 so that the loosened connecting member 10 does not hinder the assembled state.
[0126]
As shown in FIG. 9, the indwelling needle assembly 1 </ b> B has, on the distal end side of the protector 8, an engaging member 9 that engages with a concave portion 221 formed on the inner peripheral surface of the outer needle hub 22 in an assembled state. I have. Note that, in the present embodiment, the concave portion 221 is formed at a position closer to the distal end than in the first embodiment.
[0127]
The engagement member 9 is formed at a pair of elastic pieces (arms) 91, 91 protruding in the distal direction from the vicinity of the outer periphery of the distal end face of the protector main body 81, and at the distal end (opposite to the base) of each elastic piece 91. And has a convex portion (engaging portion) 92 projecting to the outer peripheral side. A hollow portion (gap) 93 is formed between the two elastic pieces 91.
[0128]
In the present embodiment, the two elastic pieces 91 and the protrusions 92 are provided at 180 ° intervals along the circumferential direction of the inner needle 31, but three or more elastic pieces are provided along the circumferential direction of the inner needle 31. The projections 91 and the projections 92 may preferably be provided at equal angular intervals.
[0129]
In the present embodiment, such an engaging member 9 is formed integrally with the protector main body 81 of the protector 8, but may be formed as a separate member.
[0130]
In the assembled state shown in FIG. 7, the two convex portions 92, 92 of the engagement member 9 are inserted into the concave portions 221, respectively. The outer needle hub 22 is in a connected state.
[0131]
In a state where the two convex portions 92, 92 are engaged with the concave portions 221, even if a certain amount of force acts on the protector 8 in the proximal direction, the engaging member 9 opposes the force, and the protector 8 It does not move proximally with respect to the outer needle hub 22. When the magnitude of the force in the proximal direction acting on the engaging member 9 becomes a certain level or more, the two elastic pieces 91 are deformed (elastically deformed) so as to bend inward, so that the two convex portions 92 are formed. The protrusions 92 are displaced toward the hollow portion 93 so as to approach each other, whereby the engagement of the two convex portions 92 and 92 with the concave portion 221 is released, and the protector 8 can move in the proximal direction with respect to the outer needle hub 22. .
[0132]
In such an indwelling needle assembly 1B, when the inner needle hub 32 is pulled in the proximal direction with respect to the outer needle hub 22 from the assembled state, first, the protector 8 is disengaged by the engagement force (connection force) of the engagement member 9. It remains on the needle hub 22 side, moves relatively to the distal end with respect to the inner needle 31, and covers the needle tip 311. When the inner needle hub 32 is further pulled in the proximal direction from this state, the tension of the connecting member 10 pulls the engaging member 9 together with the protector 8 in the proximal direction, and the outer needle hub of the engaging member 9 is pulled by this force. 22 is disengaged. As a result, the connection between the protector 8 and the outer needle hub 22 is released, and the protector 8 is separated from the outer needle hub 22 and remains at the tip of the inner needle 31 (see FIG. 8).
[0133]
Thus, according to the indwelling needle assembly 1B, the same effect as in the first embodiment can be obtained.
[0134]
As described above, the indwelling needle assembly of the present invention has been described with respect to the illustrated embodiment. However, the present invention is not limited to this, and each part constituting the indwelling needle assembly may have any function that can exhibit the same function. Can be replaced with the one having the configuration described above. Further, an arbitrary component may be added.
[0135]
【The invention's effect】
As described above, according to the present invention, by providing the engaging member that engages with the outer needle hub and connects the protector and the outer needle hub to each other, the inner needle is moved from the inside of the outer needle in the proximal direction. The protector can be automatically moved to the needle of the inner needle to cover the needle with the operation of pulling out the needle, and after the protector has covered the needle, the engagement member engages with the outer needle hub. The connection can be released smoothly and easily, and the protector can be separated from the outer needle hub. Therefore, the needle tip of the inner needle after use can be reliably covered with the protector by an extremely simple operation, and there is no accident that the needle point accidentally points a finger or the like at the time of disposal of the inner needle. Thus, it is possible to provide an indwelling needle assembly which is extremely excellent in terms of safety.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an assembled state of an indwelling needle assembly according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a state where a protector of the indwelling needle assembly shown in FIG. 1 covers a needle tip of an inner needle.
FIG. 3 is a longitudinal sectional view showing a first state of the protector in the indwelling needle assembly shown in FIG. 1;
FIG. 4 is a longitudinal sectional view showing a second state of the protector in the indwelling needle assembly shown in FIG. 1;
FIG. 5 is a plan view showing an engaging member in the indwelling needle assembly shown in FIG. 1;
FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;
FIG. 7 is a longitudinal sectional view showing an assembled state of an indwelling needle assembly according to a second embodiment of the present invention.
8 is a longitudinal sectional view showing a state in which the protector in the indwelling needle assembly shown in FIG. 7 covers the needle tip of the inner needle.
9 is a perspective view showing a distal end portion (engaging member) of the protector in the indwelling needle assembly shown in FIG. 7;
[Explanation of symbols]
1A, 1B indwelling needle assembly
2 Outer needle with hub
21 Outer needle
211 Tip opening
22 Outer needle hub
221 recess
222 taper
3 Inner needle with hub
31 Inner needle
311 needle point
32 inner needle hub
321 Ventilation filter
4 Protector
5 Protector body
51 First part
511 first hole
52 Second part
521 second hole
53 Third part
54 4th part
541 slot
55 Fifth part
56 Cover
6 plastic members
61 Needle tip storage space
62 Inner needle contact part
7 Engagement member
71 C-shaped part
72 Connecting part
721 Notch
73 hollow
74 gap
8 Protector
81 Protector body
82 Inner needle passage
83 Space
85 Shutter member
851 First part
852 second part
853 Bent
9 Engagement member
91 Elastic piece
92 convex
93 hollow
10 Connecting members

Claims (6)

  1. An inner needle having a sharp needle tip at the tip,
    An inner needle hub installed on the proximal end side of the inner needle,
    A first state mounted on the inner needle and movable in the longitudinal direction of the inner needle, and a second state covering the needle tip of the inner needle and restricting movement of the inner needle in the longitudinal direction. And a protector
    A hollow outer needle into which the inner needle can be inserted,
    An outer needle hub installed on the proximal end side of the outer needle and having a concave portion on the inner peripheral surface thereof,
    It has at least one engaging portion that can be inserted into the concave portion, and a hollow portion formed on the inner peripheral side of the engaging portion, and can maintain a state in which the engaging portion is engaged with the concave portion. And an engagement member capable of releasing the engagement of the engagement portion with the concave portion by deforming the engagement portion so as to be displaced toward the hollow portion side,
    In the assembled state, the protector is located on the proximal end side of the inner needle in the first state, and the protector and the outer needle hub are connected by the engagement of the engagement portion with the recess. Has become
    When the inner needle hub is moved in the proximal direction relative to the outer needle hub from the assembled state, the protector moves in the distal direction relative to the inner needle to change the tip of the inner needle. In the second state of covering, when the inner needle hub is further moved in the proximal direction relative to the outer needle hub, the engagement member is deformed, whereby the engagement of the engagement portion with the concave portion is performed. The indwelling needle assembly is released, and the protector and the outer needle hub are separated.
  2. The indwelling needle assembly according to claim 1, wherein the concave portion is formed over the entire circumference along a circumferential direction.
  3. The said engaging member is a member which has a substantially C-shaped C-shaped part deformable so that the outer diameter may be reduced, and the outer peripheral part of the C-shaped part comprises the said engaging part. Or the indwelling needle assembly according to 2.
  4. The engagement member has at least two elastic pieces arranged at intervals along the circumferential direction, and a convex part formed on an opposite side to a root of the elastic piece and protruding toward an outer peripheral side. 3. The indwelling needle assembly according to claim 1, wherein the protrusions constitute the engaging portion, and the protrusions are deformable so as to approach each other. 4.
  5. The protector is made of a metal material, and has a plate-shaped brake portion formed with a hole through which the inner needle can pass, and biases the brake portion so that an inclination angle of the brake portion with respect to the inner needle is reduced. And a function provided at the needle tip side of the brake portion to prevent the inclination angle of the brake portion with respect to the inner needle from being changed by contacting the inner needle in the first state. And an inner needle contact portion having
    The protector is moved from the first state toward the distal end relative to the inner needle, and the inner needle contact portion is separated from the inner needle by passing through the needle point and separating from the inner needle. The biasing means deforms the inclination angle of the brake portion with respect to the inner needle so as to be smaller than that in the first state to be in the second state, whereby the inner peripheral portion of the hole and the inner needle are The indwelling needle set according to any one of claims 1 to 4, wherein a frictional force between the inner needle and the outer peripheral surface is generated or increased to prohibit relative movement of the inner needle along a longitudinal direction. Three-dimensional.
  6. The protector has a protector main body having an inner needle passage through which the inner needle can be inserted, a first posture in which the inner needle can be inserted into the inner needle passage, and a second posture for preventing the inner needle from passing through a needle tip. And a shutter member that can be displaced to a posture of
    The shutter member includes a first portion, and a second portion present through a connecting portion to the first portion, and an end of the first portion opposite to the connecting portion, The distance between the end of the second portion and the end opposite to the connecting portion is configured to change between the first posture and the second posture,
    The indwelling needle set according to any one of claims 1 to 4, further comprising a detachment prevention unit that prevents the protector from being detached from the needle tip of the inner needle when the protector covers the needle tip of the inner needle. Three-dimensional.
JP2002236435A 2002-08-14 2002-08-14 Indwelling needle assembly Pending JP2004073403A (en)

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WO2007061144A1 (en) * 2005-11-28 2007-05-31 Nippon Sherwood Medical Industries, Ltd. Indwelling needle
JP2007312925A (en) * 2006-05-24 2007-12-06 Terumo Corp Indwelling needle assembly
US8043266B2 (en) 2004-09-03 2011-10-25 Terumo Kabushiki Kaisha Indwelling needle assembly
JP2012045434A (en) * 2005-08-08 2012-03-08 Smiths Medical Asd Inc Needle guard mechanism having inclined strut
US8647301B2 (en) 2005-08-08 2014-02-11 Smiths Medical Asd, Inc. Safety catheter device with removably attached housing
JP2014158931A (en) * 2005-09-22 2014-09-04 Tyco Healthcare Group Lp Safety needle device
US9126017B2 (en) 2005-08-08 2015-09-08 Smiths Medical Asd, Inc. Needle guard clip with heel
JP2016158888A (en) * 2015-03-02 2016-09-05 ニプロ株式会社 Indwelling needle assembly
US9480473B2 (en) 2011-12-27 2016-11-01 Y.Jacobs Medical Inc. Knotless suture, and kit containing same
US9555221B2 (en) 2014-04-10 2017-01-31 Smiths Medical Asd, Inc. Constant force hold tip protector for a safety catheter
US9555220B2 (en) 2010-06-02 2017-01-31 Smiths Medical Asd, Inc. Tip protector for a safety catheter
US9808234B2 (en) 2011-03-07 2017-11-07 Y. Jacobs Medical Inc. Suture thread
US10010317B2 (en) 2012-12-05 2018-07-03 Young Jae Kim Method of improving elasticity of tissue of living body
US10178990B2 (en) 2012-12-05 2019-01-15 Y. Jacobs Medical Inc. Apparatus for inserting surgical thread, and surgical procedure kit for inserting surgical thread comprising same
US10226320B2 (en) 2013-12-06 2019-03-12 Y.Jacobs Medical Inc. Apparatus for inserting medical tube and surgical procedure kit for inserting medical tube, having same

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US8043266B2 (en) 2004-09-03 2011-10-25 Terumo Kabushiki Kaisha Indwelling needle assembly
JP2012045435A (en) * 2005-08-08 2012-03-08 Smiths Medical Asd Inc Needle guard clip having clip subjected to coining processing
US8647301B2 (en) 2005-08-08 2014-02-11 Smiths Medical Asd, Inc. Safety catheter device with removably attached housing
US10092322B2 (en) 2005-08-08 2018-10-09 Smiths Medical Asd, Inc. Needle guard clip with heel
JP2012071170A (en) * 2005-08-08 2012-04-12 Smiths Medical Asd Inc Duckbill and needle guard mechanism with equally treated releasing force of duckbill release mechanism
JP2012045434A (en) * 2005-08-08 2012-03-08 Smiths Medical Asd Inc Needle guard mechanism having inclined strut
JP2012045436A (en) * 2005-08-08 2012-03-08 Smiths Medical Asd Inc Needle guard clip having heel
US9126017B2 (en) 2005-08-08 2015-09-08 Smiths Medical Asd, Inc. Needle guard clip with heel
JP2014158931A (en) * 2005-09-22 2014-09-04 Tyco Healthcare Group Lp Safety needle device
US8043265B2 (en) 2005-11-28 2011-10-25 Tyco Healthcare Group Lp Internal needle
US8523819B2 (en) 2005-11-28 2013-09-03 Covidien Lp Internal needle
JP2007143828A (en) * 2005-11-28 2007-06-14 Nippon Sherwood Medical Industries Ltd Indwelling needle
US9211380B2 (en) 2005-11-28 2015-12-15 Covidien Lp Internal needle
WO2007061144A1 (en) * 2005-11-28 2007-05-31 Nippon Sherwood Medical Industries, Ltd. Indwelling needle
JP2007312925A (en) * 2006-05-24 2007-12-06 Terumo Corp Indwelling needle assembly
US9555220B2 (en) 2010-06-02 2017-01-31 Smiths Medical Asd, Inc. Tip protector for a safety catheter
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