JP2002210018A - Safe indwelling needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique related to an indwelling needle syringe structure hard to generate erroneous operation, not generating the difficulty of operation due to the right hand and also easy to assemble. SOLUTION: A housing cylinder (1) has an energizing means 8, which energizes an inner needle (12) toward the base end of the housing cylinder, provided therein and also has an operation body (6) locking the inner needle with the leading end of the housing cylinder in a releasable manner so as to protrude the tip of the inner needle from the housing cylinder. The inner needle hub (12a) is fixed to the leading end of the operation body and an operation part (6a) is provided to the operation body so as to protrude to the outside of the housing cylinder. A slit (2), which houses the operation part of the operation body in a slidable manner to extend toward the base end of the housing cylinder and ensures the moving track of the operation body released from the housing cylinder, is provided to the housing cylinder and the operation part is moved on the same plane as the axial direction of the housing cylinder so as to be separated from the housing cylinder to release the inner needle from the housing cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible outer needle to be placed in a blood vessel and a hard inner needle inserted into the outer needle and penetrating the skin of a patient to introduce the outer needle into the blood vessel. The present invention relates to a safety indwelling needle provided with a needle.

[0002]

2. Description of the Related Art As a method of instilling a patient with a drip or the like, there is known a method of placing an outer needle (catheter) in a human body and supplying a drug solution or the like via the outer needle. As a device for guiding the outer needle, an indwelling needle for indwelling the outer needle using an inner needle arranged in the outer needle is known.

[0003] After the outer needle is placed in the human body, the inner needle is discarded. However, it takes a certain amount of time before the inner needle is discarded. In addition, there is a danger of a so-called needle stab accident in which the inner needle after use erroneously stabs a finger or the like of a medical worker. Patient is HI
In the case of being infected with the V virus or the like, there is a possibility that the medical staff may be infected with the virus or the like due to the needle stick accident. In order to solve this problem, a number of safety indwelling needles have been developed which immediately shield the inner needle after use to prevent a needle stick accident. For example, JP-A-3-15481 proposes a cannula insertion device for accommodating a needle hub, which may be pierced, into a hollow handle by a biasing means.

[0004] Further, in Japanese Patent Application Laid-Open Nos. 2000-167051, 2000-185096, etc., a technique relating to a safety indwelling needle (puncture device) provided with a storage mechanism for rapidly storing a used inner needle in a storage cylinder. Has been proposed. In these techniques, the operating member is operated in the circumferential direction of the storage cylinder, the inner needle is stored by the urging means, and the operation member is fixed to a notch provided in the storage cylinder.

[0005]

However, in the device disclosed in Japanese Patent Application Laid-Open No. HEI 3-15481, a portion corresponding to a trigger is released by pressing the portion corresponding to the trigger from the outside to the inside of the storage cylinder, so that an erroneous operation is performed in a scene that is not originally planned. Pressed
A malfunction that the inner needle is stored is extremely likely to occur.

The safety indwelling needle disclosed in JP-A-2000-167051 and JP-A-2000-185096 can prevent a malfunction due to an unintended pressing, but operates the storage cylinder in the circumferential direction after the inner needle is stored. Therefore, there is a problem that the operation is difficult depending on the right and left of the dominant hand. In order to solve this problem, it is necessary to prepare two types of products according to the left and right hand, which increases the production cost and management cost, and the user selects from the two types of products before use. I have to do it.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technology that does not easily cause a malfunction in a safety indwelling needle and that there is no difficulty in operation by a dominant hand.

[0008]

The present invention provides an invention having the following structure to achieve the above object.

According to the first aspect of the present invention, there is provided a flexible outer needle which is to be placed in a blood vessel, and which is inserted into the outer needle and penetrates the skin of a patient to guide the outer needle into the blood vessel. A hard inner needle with a needle hub, and a storage tube capable of storing the inner needle, having an open distal end and a closed proximal end, wherein the storage tube includes:
An operation for providing an urging means for urging the inner needle in the proximal direction therein and engaging the inner needle so that the inner needle can be released from the distal end of the storage cylinder and the distal end of the inner needle projects from the storage cylinder; The operating body has an inner needle hub fixed to the tip thereof and an operating portion provided to protrude outside the storage cylinder, and the operating section of the operating body is provided in the storage cylinder. A slit is provided to secure a movement trajectory of the operating body released from the distal end portion of the storage cylinder, which is slidably accommodated and extends in the proximal direction, and the operation section is flush with the axial direction of the storage cylinder. The present invention relates to a safety indwelling needle in which an inner needle is released from a storage cylinder by moving the needle away from the storage cylinder.

[0010] The inner needle (12) is a hard needle having an inner needle hub (12a) at the base, and is usually made of metal, and mainly stainless steel is used. The tip of the inner needle (12) is cut diagonally to facilitate puncture. The outer needle (11)
After puncturing, it is left in the human body, and is generally made of a flexible resin. The storage tube (1) is usually made of a transparent resin or the like. This is because when the inner needle (12) punctures the human body, blood reaches the inner needle hub (12a) after passing through the inner needle (12), but these parts are formed of a transparent material. By doing so, the blood that has reached the inner needle hub (12a) can be confirmed, and as a result, it can be visually recognized that the inner needle (12) has caught a blood vessel.

The inner diameter of the storage tube (1) is usually the inner needle hub (12).
outer needle hub (11) which is larger than a) and is the root of the outer needle (11).
The inner needle (12) is housed but the outer needle (11) is not housed. The storage cylinder (1) includes an operating body (6) that can release the inner needle (12) to the distal end of the storage cylinder (1) and fix the inner needle so that the distal end of the inner needle projects from the storage cylinder (1). The inner needle hub (12a) is fixed to the operation body (6). An operation section (6a) is provided to protrude outside the storage tube (6). The storage cylinder (1) is provided with a slit (2) that slidably accommodates the operating portion (6a) and extends in the proximal direction, and the operating body released from the distal end of the storage cylinder (1). The orbit of (6) is secured. As the urging means, a string-like rubber (not shown) or the like can be considered in addition to the coil spring (8) which is in a contracted state in a no-load state. The operation flow line is on the same plane as the axial direction of the storage tube (1), and unlike the movement of the storage tube (1) around the axial direction, the inconvenience of the dominant hand is eliminated.

With the operating needle (6), the inner needle (12) can be released from the distal end of the storage cylinder (1) and the cutting edge is fixed so as to protrude from the storage cylinder (1). And outer needle (1
1) puncture the skin of the patient, when the inner needle (12) and the outer needle (11) reach the blood vessel, while stopping the bleeding with one hand, pull the storage tube (1) in the other hand away from the patient, Withdraw the inner needle (12) from the blood vessel. Then, by operating the operation section (6a) of the operation body (6), the operation body (6) is released from the distal end of the storage tube (1). Then, the inner needle (12) is urged by the urging means (8) toward the proximal end of the storage cylinder (1), and the inner needle (12) moves, and accordingly, the operating body (6) also slits ( Move along 2). On the other hand, the outer needle (11) is not stored in the storage tube (1) but stays there and is connected to a drip tube or the like. The inner needle (12) that moves to the proximal end side of the storage tube (1) is moved and stored to a position where the distal end is completely drawn into the storage tube (1). Since the stored inner needle (12) is pulled by the coil spring (8) which has been reduced in the no-load state, the inner needle (12) is not exposed to the outside, so that the occurrence of a needle stick accident can be prevented.

According to the present invention, a structure is employed in which the operating portion (6a) is lifted directly from the storage tube (1) in order to release the fixation by moving the operating portion (6a) away from the storage tube. I have. When the operation unit (6a) is moved away from the storage cylinder (1), the fixing of the storage cylinder (1) and the inner needle (12) is released, and the inner needle (12) is moved by the coil spring (8). (1)
Is stored in This is different from pushing down.
Malfunction is less likely to occur.

According to a second aspect of the present invention, the operating portion has an engaging projection which can be inserted into a locking window provided in front of the storage tube, and the engaging projection is inserted into the locking window. The present invention relates to a safety indwelling needle wherein the operation body and the storage cylinder are engaged when the operation body is engaged, and the engagement between the operation body and the storage cylinder is released when the engagement protrusion is pulled out from the locking window.

In the present invention, the operation unit (6) of the operation body (6) is provided.
a) is provided with an engagement projection (6b), while a locking window (3) is provided in front of the storage tube (1), and this engagement projection (6b) is provided.
When the is inserted into the locking window (3), the operating body (6) and the storage cylinder (1)
Are engaged, and when the engagement protrusion (6b) is pulled out from the locking window (3), the engagement between the operating body (6) and the storage cylinder (1) is released. Therefore, the engagement state can be released by moving the operation portion (6a) of the operation body (6) away from the storage tube (1), and unlike the pushing down operation, a malfunction does not easily occur. When the engagement between the storage tube (1) and the operation unit (6a) is released, the inner needle (12) fixed to the operation unit (6) is stored in the storage tube (1) by the coil spring (8). You.

According to a third aspect of the present invention, in the second aspect of the invention, the operating portion has flexibility,
It is connected to the operating body via a connecting branch on the base end side of the engagement protrusion.

In the present invention, since the operating portion (6a) has flexibility and is connected to the operating body (6) via the connecting branch (6c) at the base end side from the engagement projection, Smooth operation becomes easy. That is, when placing the outer needle (11) in the human body, slightly press the outer needle (11) with, for example, the second finger of the right hand, and
Is removed from the inner needle (12), at this time, the second finger is near a notch (1f) described later of the storage tube (1). Therefore, the second finger is located slightly distal of the operation unit (6a), and the inner needle (12)
Can be immediately shifted to the operation of pulling up the operation unit (6a).

According to a fourth aspect of the present invention, in the third aspect of the present invention, an engaging protrusion is provided at a tip end of the operating portion (6a).
The present invention relates to a safety indwelling needle provided with a contact portion (6d) to which a finger is applied when lifting (6b) from the locking window (3).

When pulling up the operation unit (6a),
If d) is not formed, it will hinder rapid storage of the inner needle (12). Therefore, in the present invention, a contact portion (6d) is provided at the tip of the operation portion (6a), and the inner needle (12)
Can be stored. In addition, as shown in FIG. 4, it is preferable to provide the attracting portion (6d) so as to face the front side. In addition, it is preferable that the angle α between the axial direction and the contact portion (6d) be 90 degrees or less. in this case,
This is because the finger can be reliably hooked on the attracting portion (6d). Further, it is preferable to provide non-slip such as unevenness. This is because the inner needle (12) can be quickly and reliably stored.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described. FIGS. 1 and 2 show a flexible outer needle (1) placed in a blood vessel.
1) and a rigid inner needle (12) having an inner needle hub (12a) inserted into the outer needle (11) and penetrating the patient's skin to guide the outer needle (11) into the blood vessel. ) And a storage tube (1) having an open distal end and a closed proximal end and capable of storing the inner needle (12). This safety indwelling needle allows the inner needle (12) after puncturing to be stored up to the cutting edge. Storage tube
(1) includes an urging means (8) for urging the inner needle (12) in the proximal direction inside, and enables the inner needle (12) to be released to the distal end of the storage tube (1). And an operating body (6) that is engaged so that the tip of the inner needle projects from the storage cylinder (1). The operating body (6) has an inner needle hub (12a) fixed at the end thereof, and an operating portion (6a) protruding outside the storage cylinder (1). The storage tube (1) is provided with an operation unit (6) released from the distal end of the storage tube (1), which slidably stores the operation unit (6a) of the operation unit (6) and extends in the proximal direction. A slit (2) is provided to secure the movement trajectory, and by moving the operation unit (6a) on the same plane as the axial direction of the storage tube (1) and away from the storage tube (1), The inner needle (12) is released from the housing cylinder (1). Note that a stationary mechanism (1a) for stopping the inner needle (12) moved to the proximal end side of the storage tube (1) is provided at the base end of the storage tube (1). Stationary mechanism (1
a) is the operating body (6) when the inner needle (12) is stored in the storage cylinder (1).
It protects the operation part (6a) of the main body, and has a structure having a side wall (1b) and a canopy (1c) .When the inner needle (12) is stored in the storage cylinder (1), the storage cylinder (1) is protected. ) A stationary engagement part (1e) that engages when stationary at the rear end, and a tail plug (1d) that closes the base end of the storage cylinder (1)
It has.

As the biasing means (8), a coil spring is employed. Incidentally, the outer needle hub (11a) is formed in a roto shape to facilitate connection of the chemical solution to the tube, and has a flange (11b) at the rear end. As shown in FIG. 4, a filter (13) for preventing the patient's blood from leaking is provided inside the inner needle hub (12a).
Is provided.

A notch (1f) is provided at the distal end of the storage tube (1) to facilitate the operation of puncturing the inner needle (12) and the outer needle (11) into a patient. This allows the second finger to touch the inner needle hub (12a). In addition, when the inner needle (12) and the outer needle (11) are punctured into the patient near the notch (1f), the entire safety indwelling needle is held by the first and third fingers. Grip for gripping when supporting
(1g).

An inner needle hub (12a) is fixed to the operating body (6), so that when the operating body (6) is stored, the inner needle (12) moves with the operating body (6). I do. The operation section (6a) is connected to the operation body (6) at a middle portion thereof via a connecting branch (6c).
The operating portion (6a) of the operating body (6) is provided with an engagement projection (6b), and the engagement projection (6b) is provided at a distal end of the storage tube (1) with a locking window ( By being inserted into 3), the biasing means (8)
The operating body (6) is fastened to the outer needle (11) side against the urging force of (1). The operating portion (6a) may be provided at its tip with an engaging portion (6d) for applying a finger when the engaging projection (6b) is pulled up from the locking window portion (3). 6
c) is a fulcrum of the force applied to the attracting portion (6d). The engaging projection (6b) and the locking window (3) are
Are formed in such a position that they are on the same plane as the axial direction of the storage cylinder (1).

In the front of the housing cylinder (1), the grips (1g) arranged on both sides of the locking window (3) are horizontally gripped with the first and third fingers, and the second finger is the first finger. When the user grips the third finger slightly in front of it, the needle tip is stabilized because the proximal end of the storage tube (1) comes into contact with the palm of the hand. From this state, the inner needle (12) and the outer needle (11) are pierced into a blood vessel such as a vein of the human body, and thereafter, the vicinity of the rear end flange (11b) of the outer needle hub (11a) is pushed out with a second finger. Remove from inner needle (12) and outer needle (11) into blood vessel
Detain. A notch (1f) is provided at the leading end of the storage tube (1) so that the vicinity of the flange (11b) can be easily pushed out.

After the outer needle (11) is placed in the patient, the inner needle (12) is exposed, so that the operation unit (6a)
Pull up the front contacting part (6d) of the operation body (6)
And the storage cylinder (1) is released from the locked state. At this time, since the flow line of the attracting portion (6d) is not the operation in the direction around the axis of the storage cylinder (1), the problem of the dominant hand does not occur. The inner needle (12) is pulled by a coil spring (8) fixed between the tail plug (1d) and the inner needle hub (12a), and is housed in the housing cylinder (1). At this time, since the inner needle hub (12a) is fixed to the tip of the operating body (6), the inner needle (12) moves together with the operating body (6) and is drawn into the rear of the storage tube (1). It is.

At the base end of the slit (2), a triangular stationary engaging portion (1e) is provided. The proximal end of the operating body (6) is preferably provided with a stationary engaging portion (6f), and the operating body moved by the urging force of the coil spring (8).
The stationary engagement part (6f) of (6) is the stationary engagement part (1e) of the stationary mechanism (1a).
Get over easily. After getting over, the stationary engagement part (6f)
Since the and the stationary engagement portion (1e) collide with each other, the movement of the operating body (6) toward the outer needle (11) is restricted. The stationary engagement portion (6f) and the stationary engagement portion (1e) are configured such that the inner needle is
If it can be achieved only by (8), it is not an essential configuration. Further, although this can be achieved only by the urging means (8), the stationary engaging portion (6f) and the stationary engaging portion (1e) may be additionally provided.

FIG. 3 shows a state before puncturing a patient. When piercing the inner needle (12) and the outer needle (11) into a blood vessel or the like, the engaging projection (6b) of the operation portion (6a) was inserted into the locking window (3) of the storage tube (1). It is in a state. In this state, the inner needle (12) is fastened to the tip of the storage tube (1) against the storage of the inner needle (12) in the storage tube (1) by the urging force of the coil spring (8). I have. After placing the outer needle (11) in the human body,
In order to store the inner needle (12) in the storage tube (1), the attracting portion (6d) of the operation portion (6a) is pulled up. Then the connecting branch (6c)
With the fulcrum as the fulcrum, the front of the operation portion (6a) is pulled up, so that the engagement protrusion (6b) inserted into the locking window (3) is pulled out, and the inner needle is biased by the urging force of the coil spring (8). (1
2) is stored in the storage cylinder (1) together with the operating body (6).

FIG. 5 shows a state in which the cap (20) is attached. FIG. 6 is a perspective view seen from the opening side of the cap (20). Cap (20) is for outer needle (11) and inner needle
In order to cover (12) in a piercable state and to render the operation unit (6a) inoperative, the operation unit (6a) is provided with an operation unit groove (20a) that is stuck and cannot be moved. For this reason, when the cap (20) is attached, the operation unit (6
Since a) is disabled, insert the inner needle (12) into the storage cylinder (1).
A malfunction such as being stored in the inside can be prevented.

Based on yet another embodiment and the drawings,
The present invention will be described. The relationship between the inner needle (12) and the outer needle (11)
As shown in FIG. As described above, the needle body (10)
Has an outer needle (11) in the form of a pipe made of a soft resin, and the tip of the outer needle (11) is formed to be thin so as to increase the degree of close contact with the inner needle (12). At the base end of the outer needle (11), a funnel-shaped outer needle hub (11a) is provided for connection with a tube of a drug solution such as a drip.

In the method of assembling the indwelling needle syringe according to the present invention, the operating body (6), the coil spring (8) and the tail plug (9) are housed from the base end of the housing cylinder (1). The connecting branch (6c) is inserted into the slit (2) so that the operation unit (6a) is located outside the storage tube (1), and the operation body (6) is moved to the front end of the storage tube. The engagement projection (6b) of 6a) is fitted into the locking window (3). After the fitting, the inner needle (12) with the outer needle (11) attached thereto is attached to the operating body (6) from the tip of the storage tube (1).

Next, a third embodiment will be described. In FIG. 8, the connecting branch (6c) is provided at the base end of the operating portion (6a), and the locking projection (6a) provided at the distal end is provided with a locking window.
It fits in (3). A non-slip rib (14) is provided on a front side surface of the operation unit (6a). FIG. 9 shows a state in which the fitted state of the operation unit (6a) is released to be in a detached state. The transition from the fitted state to the detached state is performed by pulling up the vicinity of the anti-slip rib (14) in front of the operation unit (6a). When piercing the inner needle (12) and the outer needle (11), the operation unit (6a)
Even if the finger of the healthcare worker or an object around the healthcare worker touches, a rotation moment in the opposite direction to the rotation moment acting to release the fitted state is applied, so the connecting branch (6c) The rotational moments acting as the fulcrum act in opposite directions, and there is no occurrence of a malfunction in which the fitted state is released. Other than that, the assembling method and the like are the same as those of the above-described embodiment.

Although the other embodiments are common, it is preferable that the operating body (6) and the operating section (6a) are made of a flexible material. This is because the displacement of the operation section (6a) is facilitated, and the fitted state can be easily released. It is also possible to connect the operating part (6a) and the operating body (6) with another member, or to make a part of the operating part (6a) fitted into the locking window part (3) as a separate part. is there.

[0033]

According to the present invention, it is possible to provide an indwelling needle syringe structure in which malfunction does not easily occur, operation by a dominant hand is not difficult, and assembly is easy.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an example of a safety indwelling needle syringe of the present invention.

FIG. 2 is a partial longitudinal sectional view of the safety indwelling needle syringe before use of the present invention.

FIG. 3 is a partially enlarged longitudinal sectional view of the vicinity of an operation unit shown in FIG. 1;

FIG. 4 is an enlarged partial cross-sectional view showing the periphery of an operation unit according to the first embodiment.

FIG. 5 is an overall perspective view showing an example of an indwelling needle syringe with a cap.

FIG. 6 is a perspective view of the cap as viewed from the opening side.

FIG. 7 is a perspective view showing an assembled state of an inner needle and an outer needle.

FIG. 8 is an enlarged partial cross-sectional view showing the periphery of an operation unit according to the second embodiment.

FIG. 9 is an enlarged partial cross-sectional view showing the periphery of an operation unit according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage cylinder 1a Stationary mechanism 1d Tail plug 1e Stationary engagement part 1f Notch part 1g Grip part 2 Slit 3 Locking window part 6a Operation part 6b Engagement projection 6c Joining branch 6d Clamping part 6 Operating body 6f Static engagement part 8 Coil spring 11 Outer needle 11a Outer needle hub 11b Flange part 12 Inner needle 12a Inner needle hub 13 Filter 20 Cap 20a Groove for operating part α Angle between axial direction and contact part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kentaro Takemae 2-5-1-12 Irie, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Pencil Co., Ltd. Yokohama Office (72) Inventor Eiichiro Kazuhara Irie, Kanagawa-ku, Yokohama, Kanagawa 2-5-1-12 Mitsubishi Pencil Co., Ltd. Yokohama Office F-term (reference) 4C167 AA23 BB04 BB23 BB31 BB34 BB37 CC08 GG22 GG36 HH08 HH09

Claims (4)

[Claims] 1. A hard outer needle having a flexible outer needle to be placed in a blood vessel and an inner needle hub inserted into the outer needle for guiding the outer needle into a blood vessel through a patient's skin. An inner needle, and a storage tube having an open distal end and a closed proximal end, the inner tube being capable of storing the inner needle, the storage tube having an inner portion for urging the inner needle in a proximal direction. And an operating body that is capable of releasing the inner needle to the distal end of the storage cylinder and engages the distal end of the inner needle so that the distal end of the inner needle protrudes from the storage cylinder. A hub is fixed, and an operation unit is provided to protrude outside the storage cylinder. The storage cylinder includes an operation unit of an operation body that is slidably accommodated and extends in a proximal direction. A slit is provided to secure the movement trajectory of the operating body released from the tip, and the operating unit is stored On axially flush, by moving away from the storage cylinder, the safety indwelling needle inner needle is to be released from the holding cylinder. 2. The operating section has an engaging projection which can be inserted into a locking window provided at a distal end of the storage cylinder, and the operating body is inserted when the engaging projection is inserted into the locking window. 2. The safety indwelling needle according to claim 1, wherein the needle is fixed to a distal end portion of the storage cylinder, and the engagement between the operating body and the storage cylinder is released when the engagement protrusion is pulled out from the locking window. 3. The operation unit has flexibility,
3. The safety indwelling needle according to claim 2, wherein the safety indwelling needle is connected to the operating body via a connecting branch at a base end side of the engagement protrusion. 4. The safety indwelling needle according to claim 3, wherein a tip portion is provided at a distal end portion of the operation portion for applying a finger when the engagement protrusion is pulled out from the locking window.