JP5441565B2 - Indwelling needle syringe - Google Patents

Description

  The present invention relates to an indwelling needle injector, and includes, for example, a metal inner needle for penetrating the skin and reaching a blood vessel, and a soft outer needle positioned outside the inner needle and placed in the blood vessel. Related to indwelling needle syringes.

Conventionally, treatments such as artificial dialysis or infusion for supplying a predetermined drug solution or the like are performed on a patient's blood vessel using an indwelling needle. For example, Patent Document 1 discloses a structure of a winged indwelling needle (indwelling needle injector).
Here, the structure of the indwelling needle with a wing described in Patent Document 1 will be described with reference to FIG.

  Specifically, as shown in the figure, an indwelling needle Z with a wing according to the prior art includes a plastic outer needle 100 having flexibility, a fixed wing 110 fitted and fixed to the outer needle 100, and an outer needle. 100, an outer needle-side hub 103 provided at the base end portion, an outer needle 100 and an outer needle-side hub 103 that are removably inserted into the outer needle-side hub 103, a tip portion protruding forward from the outer needle 100, an inner needle 120, An inner needle-side hub 121 that is externally fitted and fixed to the proximal end portion of the needle 120 is provided.

The fixed wing 110 includes a holding cylinder portion 111 that is externally fitted and fixed to the outer needle 100, a pair of left and right wing portions 112 projecting from the lower portion of the holding cylinder portion 111, and a pair of left and right connecting portions. (Rib portion) 113.
Further, the outer needle side hub 103 has a cylindrical shape, and a distal end portion thereof is fitted and fixed to a proximal end portion of the outer needle 100.
Further, the inner needle side hub 121 is formed in a cylindrical shape, and a distal end portion thereof is fitted and fixed to the proximal end portion of the inner needle 120 and is inserted into the base portion of the outer needle side hub 103 so as to be detachable.

And the infusion and blood collection with respect to the patient using the indwelling needle Z with a wing | blade mentioned above are performed as follows.
Specifically, first, a user such as a doctor or a nurse holds the indwelling needle Z with wings and punctures the inner needle 120 and the outer needle 100 into the blood vessel of the patient.
Next, when the puncture of the inner needle 120 and the outer needle 100 is completed, the wing 112 of the fixed wing 110 is fixed to the patient (patient's arm, hand, etc.) with tape.
Next, the inner needle 120 is pulled out and removed from the outer needle 100 and the outer needle-side hub 103, and then an infusion tube is connected to the outer needle-side hub 103 to perform infusion and blood collection.

JP 2003-339858 A

By the way, since the indwelling needle injector has sharp tips at the inner needle and the outer needle and is punctured into the patient's skin, it can be handled safely and hygienically before and after use. It is hoped that.
However, the above-described prior art indwelling needle has a technical problem that when the inner needle punctured by the patient is pulled out, the inner needle is exposed, and as a result, a so-called needle stick accident may occur. Had.
Moreover, even if the indwelling needle with the wing of the above-described prior art is provided with a main body for storing the inner needle, the wing portion is fitted and fixed to the outer needle. It could not be stored (in the case where the main body is formed in a size that can store the wings, the indwelling needle becomes larger and the usability is reduced).
For this reason, the above-described conventional indwelling needle with a wing is fitted with a cap-shaped protector on the outer needle in an initial state before use, but this has led to an increase in the number of parts. Moreover, since the protector is generally discarded after use, it has been a factor of increasing waste.

  The present invention has been made to solve the above technical problem, and an object of the present invention is to provide an indwelling needle injector that can be handled safely and hygienically before and after use.

In order to solve the above-mentioned problems, the present invention provides an indwelling needle comprising a soft outer needle formed in a hollow cylindrical shape and a hard inner needle that is removably inserted into the outer needle cylinder. In the syringe, a hollow cylindrical shaft body having both ends penetrated, a tip shaft detachably attached to a tip portion of the shaft body, a wing portion fixed to the tip shaft, and a cylinder in the shaft body A slider that is housed and is movable in the axial direction of the shaft body and that holds the inner needle at its tip, and is detachably fitted to the tip of the slider, and the outer needle at the tip The slider is disposed on the rear end side of the shaft body in an initial state before use, and the outer needle joint is fitted to the tip of the slider, and the inner needle Both the outer needle and the outer needle are housed in the shaft body, and the slider in the initial state is moved to the tip side of the shaft body. If that, the outer needle fitting moves distally of the shaft together with the slider, the blade portion is inserted into a cylinder of said front barrel which is fixed, while being fitted to the tip axis, wherein The inner needle and the outer needle protrude from the tip shaft to form a puncture state, and the fitting force between the outer needle joint and the tip shaft is larger than the fitting force between the outer needle joint and the tip of the slider. When the slider is retreated toward the rear end side of the shaft body from the puncture state, the slider is detached from the outer needle joint, the inner needle is accommodated in the shaft body, and the front shaft Is removed from the tip of the shaft .

According to the above configuration, the outer needle and the wing portion can be separated from each other in the stage before use, and thus the outer needle can be stored together with the inner needle in the cylinder of the shaft body. Become.
Further, with the above configuration, the outer needle joint that holds the outer needle can be fixed to the tip shaft on which the wing is fixed by moving the slider to the tip end side of the shaft body (the wing is attached to the outer needle. Can be worn).
Therefore, according to the present invention, a so-called winged indwelling needle syringe can be handled safely and hygienically.
In addition, the indwelling needle injector of the present invention does not need to be provided with a protector that covers the outer peripheral portion of the outer needle unlike the conventional winged indwelling needle injector. The amount of can be reduced.
Furthermore, the fitting force between the outer needle joint and the tip shaft is formed larger than the fitting force between the outer needle joint and the tip of the slider.
With the above configuration, when the slider is retracted toward the rear end side of the shaft body, the slider is automatically detached from the outer needle joint fitted to the front shaft, and together with the inner needle held by itself, the shaft body Retreats to the rear end side and is accommodated in the shaft body.

When the outer needle joint is fitted to the tip of the slider, the inner needle held by the tip of the slider is inserted through the cylinder of the outer needle held by the outer needle joint, and the tip When the portion protrudes from the tip of the outer needle and moves the slider in the initial state to the tip side of the shaft body, the outer needle joint is fitted and fixed in the cylinder of the tip shaft, and the inner needle and It is desirable that the outer needle protrudes from the tip shaft.
As described above, according to the present invention, the inner needle and the outer needle housed in the shaft body are projected from the front shaft after the indwelling needle injector is used, and the wing portion is attached to the outer needle. Therefore, the indwelling needle syringe can be used safely.

The shaft body is provided with a biasing means for biasing the slider toward the rear end side of the shaft body. In the initial state, the slider and the outer needle fitted to the slider are provided. It is desirable that the joint is urged by the urging means and disposed on the rear end side of the shaft body.
Thus, according to the present invention, in the initial state, the slider and the outer needle joint fitted to the slider are urged by the urging means and disposed on the rear end side of the shaft body. The inner needle and the outer needle do not protrude outside before use, and a “needle stick accident” before use can be prevented.

In addition, a guide groove extending in the axial direction of the shaft body is formed on the surface of the shaft body, and the slider includes an operation portion that is slidably inserted into the guide groove. By moving along the guide groove, it is possible to move in the axial direction of the shaft body, and the operation portion can be detachably locked to the tip end side of the shaft body, When the operating portion is moved to the distal end side of the shaft body and locked to the distal end side of the shaft body, the outer needle joint fitted to the slider is fitted into the cylinder of the tip shaft and the inner When the state in which the needle and the outer needle protrude from the tip shaft is maintained, and the locking is released, the slider is urged toward the rear end side of the shaft body by the urging means. The outer needle joint that is fitted to the shaft is disengaged, retreats to the rear end side of the shaft body together with the held inner needle, It is desirable to be accommodated in the body.
In addition, a shaft body that houses a slider that holds the inner needle is removed from a tip shaft that is fitted with an outer needle joint that holds the outer needle, and an infusion tube is connected to the rear end side of the tip shaft. Thus, it is desirable to form an infusion line.

With the above configuration, when a user such as a doctor or a nurse punctures an inner needle and an outer needle of an indwelling needle syringe into a blood vessel, after that, the inner needle punctured into the blood vessel is simply released by releasing the locking. It can be extracted from the blood vessel and stored in the shaft.
In the present invention, the tip shaft fitted with the outer needle joint that holds the outer needle is detachably attached to the shaft body that houses the inner needle.
Therefore, after removing the inner needle punctured from the blood vessel from the blood vessel and storing the inner needle in the shaft body, the outer needle with the wings attached can be safely removed by removing the shaft body from the front shaft. Can be left in place.

  According to the present invention, an indwelling needle injector that can be handled safely and hygienically before and after use can be provided.

It is the front view which showed the state before use of the indwelling needle injector of embodiment of this invention. It is AA sectional drawing of the indwelling needle syringe shown in FIG. It is the front view which showed the state which act | operated the indwelling needle injector of embodiment of this invention. It is BB sectional drawing of the indwelling needle syringe shown in FIG. It is the front view which showed the state which removed the front axis | shaft from the shaft body of the indwelling needle syringe of embodiment of this invention. It is CC sectional drawing of the indwelling needle syringe shown in FIG. It is a perspective view of a tip axis of an embodiment of the present invention. It is DD sectional drawing of the front axis | shaft shown in FIG. It is a top view of the tail plug of the embodiment of the present invention. It is EE sectional drawing of the tail plug shown in FIG. It is the schematic diagram which showed the slider and inner needle of the indwelling needle syringe of this embodiment. It is the schematic diagram which showed the cross section of the slider holding the inner needle of the indwelling needle syringe of this embodiment. It is the perspective view which showed the outer needle coupling which hold | maintains the outer needle which comprises the indwelling needle injector of this embodiment. It is a front view of the outer needle joint which holds the outer needle which constitutes the indwelling needle injector of this embodiment. It is FF sectional drawing of the outer needle joint holding the outer needle shown in FIG. It is a schematic diagram for demonstrating the relationship between the slider of the indwelling needle syringe of this embodiment, and an outer needle coupling. It is a schematic diagram for demonstrating the fitting part with the outer needle coupling of the indwelling needle syringe of this embodiment, and a front shaft. It is the schematic diagram which showed the state which the slider of the indwelling needle syringe of this embodiment moved away from the outer needle joint. It is the schematic diagram which showed the state which accommodated only the inner needle in the shaft, after puncturing the inner needle and the outer needle of the indwelling needle syringe of this embodiment. It is the schematic diagram which showed the structure of the indwelling needle of a prior art.

Hereinafter, the indwelling needle injector of embodiment of this invention is demonstrated.
First, a schematic configuration of an indwelling needle injector according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing an initial state before use of an indwelling needle injector according to an embodiment of the present invention. Moreover, FIG. 2 is AA sectional drawing of the indwelling needle syringe shown in FIG.
FIG. 3 is a front view showing a state in which the indwelling needle injector according to the embodiment of the present invention is operated. FIG. 4 is a BB cross-sectional view of the indwelling needle injector shown in FIG.
Moreover, FIG. 5 is the front view which showed the state which removed the front axis | shaft from the shaft body of the indwelling needle syringe of embodiment of this invention. 6 is a cross-sectional view taken along the line CC of the indwelling needle injector shown in FIG.

As shown in the figure, the indwelling needle syringe W includes a hollow cylindrical shaft body 1 with both ends penetrating, and a hollow cylindrical tip with both ends penetratingly attached to the distal end portion of the shaft body 1. The shaft 2, the wing 3 fitted and fixed to the outer periphery of the front shaft 2, the tail plug 4 closing the rear end of the shaft 1, and the shaft 1 accommodated in the cylinder and moving in the axial direction The slider 10 (see FIGS. 2, 4, 6) made possible, the hard inner needle 6 held at the tip of the slider 10, and detachably fitted to the tip of the slider 10 and together with the slider 10 The outer needle joint 20 is movable in the axial direction, and the soft outer needle 5 is held at the tip of the outer needle joint 20.
Further, in the cylinder of the shaft body 1, an urging means (for example, a tension coil spring) 40 that is sandwiched between the tail plug 4 and the slider 10 and urges the slider 10 toward the rear end side of the shaft body 1 is accommodated. Has been.
The outer needle joint 20 has both ends penetrating, and the slider 10 and the inner needle 6 are inserted through the insertion / removal material.

Further, the inner needle 6 is inserted into the cylinder of the outer needle 5 so as to be detachable.
When the tip of the slider 10 is fitted to the outer needle joint 20, the inner needle 6 held at the tip of the slider 10 is held by the outer needle joint 20 via the outer needle joint 20. The tip of the outer needle 5 protrudes from the tip of the outer needle 5.
In the present embodiment, the configuration in which the tip end portion of the shaft body 1 and the tip shaft 2 are detachably mounted is not specifically limited. For example, a thread groove is formed on the inner cylinder surface on the tip side of the shaft body 1, a screw thread that is screwed with the thread groove is formed on the outer peripheral surface of the shaft body 2, and the tip shaft 2 is formed in the thread groove of the shaft body 1. It may be configured such that the shaft body 1 and the tip shaft 2 can be mounted by screwing the screw threads. In this case, the tip shaft 2 can be detached from the shaft body 1 by rotating and loosening the tip shaft 2 screwed into the shaft body 1.
Further, for example, the distal end portion of the shaft body 1 and the tip shaft 2 may be detachably mounted by a bayonet mechanism.

Further, the shaft body 1 is formed with a long hole-shaped guide groove 1 a extending in the axial direction of the shaft body 1 on a side surface portion thereof, and a guide protrusion formed on the outer periphery of the slider 10 in the guide groove 1 a. (Operation unit) 10c (see FIGS. 2, 4, and 6) is slidably inserted. In addition, a locking hole 1b larger (wider) than the width of the guide groove 1a is formed at one end (tip) of the guide groove 1a.
The slider 10 is provided with a plate-like operation piece (operation part) 10d at the upper end of the guide protrusion 10c. Further, a claw portion 10d1 that is locked to the locking hole 1b is provided at the tip of the operation piece 10d.
In the present embodiment, the side surface portion of the shaft body 1 refers to the circumferential outer surface of the shaft body 1. Further, the guide groove 1a may be formed at any position as long as it is on the outer circumferential surface.

In the indwelling needle syringe W configured as described above, in the initial state before use (the state shown in FIGS. 1 and 2), the outer needle joint 20 fitted to the slider 10 and the slider 10 is biased. The means 40 is biased toward the rear end side and is maintained in a state of being arranged on the rear end side of the shaft body 1, and the outer needle 5 and the inner needle 6 are accommodated inside the shaft body 1. .
Thus, since the outer needle 5 and the inner needle 6 are housed in the shaft body 1 before use, the indwelling needle syringe W of the present embodiment ensures safety before use. Moreover, the outer needle 5 and the inner needle 6 before use can be hold | maintained hygienically.

When the indwelling needle syringe W is used, the operation piece 10d of the slider 10 is pressed toward the tip side (load is applied in the Y2 direction), and the slider 10 (the slider 10 in the initial state shown in FIGS. 1 and 2) is obtained. ) Is moved to the distal end side of the shaft body 1, and the claw portion 10d1 of the operation piece 10d is locked in the locking hole 1b on the distal end side of the guide groove 1a. In this case, the outer needle joint 20 attached to the distal end portion of the slider 10 moves to the distal end side of the shaft body 1 together with the slider 10.
As a result, as shown in FIGS. 3 and 4, the indwelling needle syringe W is in a state in which the outer needle 5 and the inner needle 6 protrude from the opening 2a1 at the distal end portion of the front shaft 2 (for convenience of explanation, “the puncture use state”). ”).
As will be described later, when the slider 10 is moved to the puncture use state, the outer peripheral portion of the outer needle joint 20 fitted to the slider 10 is connected to the front shaft 2 on which the wing portion 3 is fixedly fitted. It is fitted to the inner cylinder surface.

In the puncture use state, when the locking of the claw portion 10d1 of the operation piece 10d is released, the slider 10 is urged to the rear end side by the urging means 40 and is fitted to the front shaft 2. It is disengaged from the joint 20 and retracts toward the rear end side of the shaft body 1.
Therefore, according to the present embodiment, when the indwelling needle syringe W in the puncture use state is picked up, the outer needle 5 and the inner needle 6 are punctured into the blood vessel of the patient, and then the claw portion 10d1 is unlocked, Only the inner needle 6 held by the slider 10 is extracted from the blood vessel and accommodated in the shaft body 1.

In the present embodiment, since the tip shaft 2 is detachably attached to the shaft body 1, after the inner needle 6 is pulled out from the blood vessel and accommodated in the shaft body 1, as shown in FIGS. 5 and 6. In addition, the front shaft 2 can be detached from the shaft body 1.
That is, according to this embodiment, the used inner needle 6 can be removed after being stored in the shaft body 1, so that a “needle stick accident” by a user such as a doctor or a nurse is prevented.
Hereinafter, the structure of each component of the indwelling needle syringe W of this embodiment will be described.

First, the shaft 1 of the indwelling needle syringe W will be described with reference to FIGS. 1 and 2.
As shown in the figure, the shaft body 1 is formed in a hollow cylindrical shape with both ends penetrating as described above, and a long hole-shaped guide extending in the axial direction of the shaft body 1 on its side surface (circumferential outer surface). A groove 1a is formed, and a locking hole 1b larger (wider) than the width of the guide groove 1a is formed at one end (tip) of the guide groove 1a.
Further, the outer peripheral portion on the rear end side of the shaft body 1 is shaped to be fitted to the inner peripheral side surface of the tail plug 4 that supports and fixes the rear end of the urging means 40.
Note that the shaft body 1 is made of, for example, a synthetic resin.

Next, the front shaft 2 of the indwelling needle syringe W will be described with reference to FIGS. 7 and 8.
FIG. 7 is a perspective view of the front shaft of the embodiment of the present invention. 8 is a DD cross-sectional view of the front shaft shown in FIG.
As shown in the figure, the front shaft 2 has a hollow cylindrical shape through which openings 2a1 and 2a2 formed at both ends pass. Further, the front shaft 2 is formed with a locking hole 2b in which a locking portion 20b2 (see FIG. 15) formed in the outer needle joint 20 is locked on the side surface on the distal end side.
Further, the rear end portion (end portion on the opening 2a2 side) of the front shaft 2 is detachably fitted into the front end side cylinder of the shaft body 1 (see FIG. 2).
The front shaft 2 is formed of, for example, a synthetic resin.

Next, the tail plug 4 of the indwelling needle syringe W will be described with reference to FIGS. 9 and 10.
FIG. 9 is a plan view of the tail plug according to the embodiment of the present invention. FIG. 10 is an EE cross-sectional view of the tail plug shown in FIG.
As shown in the figure, the tail plug 4 is formed in a hollow cylindrical shape having an upper surface portion 4a formed at one end (upper end) and an opening 4b formed at the other end (lower end). The upper surface portion 4a has an opening at the lower end. A cylindrical portion 4c extending toward 4b is provided.
Further, the cylindrical portion 4c is provided with a spring seat 4c1 on the open end side, on which one end portion of the biasing means 40 is supported and fixed.
Then, as shown in FIG. 2, the rear end portion of the shaft body 1 is inserted between the inner peripheral side surface of the tail plug 4 to which the biasing means 40 is fixed and the outer peripheral side surface portion of the cylindrical portion 4c. As a result, the rear end portion of the shaft body 1 is closed.
The tail plug 4 is made of, for example, a synthetic resin.

Next, the slider 10 and the inner needle 6 of the indwelling needle syringe W will be described with reference to FIGS.
FIG. 11 is a schematic diagram showing a slider and an inner needle of the indwelling needle injector of the present embodiment. FIG. 12 is a schematic view showing a cross section of the slider holding the inner needle of the indwelling needle injector of the present embodiment.

As shown in the drawing, the slider 10 is formed in a cylindrical shape, and an inner needle holding portion 10a into which the rear end portion of the inner needle 6 is inserted and fixed is formed on one end (front end) side.
Further, the inner needle 6 is formed in a hollow cylindrical shape with both ends penetrating, and has a sharp tip (a shape formed by obliquely cutting the tip (a shape of a so-called “needle tip of an injection needle”)). Has been made.
The slider 10 is made of, for example, a synthetic resin. Further, the inner needle 6 is formed of a metal such as stainless steel, for example.

The structure of the slider 10 will be described in detail. The slider 10 is formed with a spring receiving portion 10b on the other end (rear end) side on which the front end portion of the urging means 40 is supported and fixed.
The slider 10 has a convex guide projection 10c extending in the radial direction of the slider 10 on the outer peripheral portion thereof, and an operation piece 10d formed in a plate shape on the upper end of the guide projection 10c. It has been.
Further, a claw portion 10d1 that protrudes in a direction opposite to the shaft body 1 when the slider 10 is attached to the shaft body 1 is formed at the tip of the operation piece 10d.
The slider 10 housed in the cylinder of the shaft body 1 has a guide protrusion 10c slidably inserted into the guide groove 1a of the shaft body 1, and an operation piece 10d formed at the upper end of the guide protrusion 10c. By operating and moving the guide protrusion 10c along the guide groove 1a, the axial center direction of the shaft body 1 can be moved.

Next, the outer needle joint 20 and the outer needle 5 of the indwelling needle syringe W will be described with reference to FIGS.
FIG. 13 is a perspective view showing an outer needle joint that holds an outer needle constituting the indwelling needle injector of the present embodiment. FIG. 14 is a front view of an outer needle joint that holds an outer needle constituting the indwelling needle injector of the present embodiment. FIG. 15 is a cross-sectional view of the outer needle joint that holds the outer needle shown in FIG.

As shown in the drawing, the outer needle joint 20 has an inner cylinder part 20a through which openings 20a1 and 20a2 (see FIG. 15) formed at both ends pass, and a concentric shape with the inner cylinder part 20a on the outer peripheral side of the inner cylinder part 20a. And a base end portion 20c (see FIG. 15) that connects the rear end portion of the inner cylinder portion 20a and the rear end portion of the outer cylinder portion 20b. In addition, the inner cylinder part 20a, the outer cylinder part 20b, and the base end part 20c are integrally formed.
Further, the outer needle 5 is formed in a hollow cylindrical shape with both ends penetrating, and the tip portion thereof has a sharp shape.
The outer needle joint 20 is made of, for example, a synthetic resin. The outer needle 5 is made of PE (polyethylene), PP (polypropylene), Teflon (registered trademark), polyurethane, or the like.

The structure of the outer needle joint 20 will be described in detail. The rear end portion of the outer needle 5 is inserted and fixed in the opening 20a1 on the distal end side of the inner cylinder portion 20a.
Further, the outer cylinder portion 20b constituting the outer needle joint 20 is formed with a notch 20b1, and can be elastically deformed in the radial direction. A locking portion 20b2 protruding in the radial direction is formed on the outer peripheral surface of the outer cylinder portion 20b.
Then, the outer needle joint 20 is inserted into the cylinder of the front shaft 2, and the locking part 20b2 of the outer cylinder part 20b is locked in the locking hole 2b (see FIGS. 7 and 8). The front shaft 2 is fitted.

Further, a through hole 20c1 is formed in the base end portion 20c, and the through hole 20c1 communicates with the inside of the inner cylinder portion 20a. As a result, the through hole 20 c 1 at the rear end of the outer needle joint 20 communicates with the inside of the cylinder of the outer needle 5 held at the tip of the outer needle joint 20.
Further, the inner peripheral surface of the through hole 20c1 of the base end portion 20c has a shape in which the outer peripheral portion on the distal end side of the slider 10 is inserted and fitted.
With this configuration, when the slider 10 holding the inner needle 6 is inserted into the through hole 20c1 on the rear end side of the outer needle joint 20, the slider 10 is fitted to the inner peripheral surface of the through hole 20c1, and the inner needle 6 is inserted into the cylinder of the outer needle 5 through the inner cylinder portion 20 a of the outer needle joint 20, and the tip of the inner needle 6 projects forward from the outer needle 5.

Then, the state and operation | movement before and behind use of the indwelling needle syringe W of this embodiment are demonstrated using FIG.2, FIG.4 and FIG.6 and FIGS.
FIG. 16 is a schematic diagram for explaining the relationship between the slider and the outer needle joint of the indwelling needle injector of the present embodiment, and FIG. 16A is a state where the slider is not fitted to the outer needle joint. FIG. 16B shows a state in which the slider is fitted to the outer needle joint.
FIG. 17 is a schematic diagram for explaining a fitting portion between the outer needle joint of the indwelling needle injector and the front shaft of the present embodiment.
FIG. 18 is a schematic view showing a state in which the slider of the indwelling needle injector of the present embodiment moves backward away from the outer needle joint.
FIG. 19 is a schematic view showing a state in which only the inner needle is housed in the shaft body after the indwelling needle injector of the present embodiment is put into a puncture use state.
The arrow “F1” shown in FIGS. 16 and 18 schematically shows the biasing force in the Y1 direction that the slider 10 receives from the biasing means 40 (not shown in FIGS. 16 and 18). It is.
Further, an arrow “F3” shown in FIG. 16B indicates that “the slider 10 and the slider 10 that opposes the urging force F1 when the slider 10 locked in the locking hole 1b of the shaft body 1 is unlocked. The fitting force (the force in the Y2 direction) with the outer needle joint 20 is schematically shown.
Further, an arrow “F2” in FIG. 18 indicates that “the outer needle joint 20 and the front shaft are opposed to the urging force F1 when the slider 10 locked in the locking hole 1b of the shaft body 1 is unlocked. FIG. 2 schematically shows a “fitting force with 2 (fitting force in the Y2 direction)”.

First, the initial state before use of the indwelling needle syringe W of this embodiment is demonstrated.
As shown in FIG. 2, in the initial state, the slider 10 that holds the rear end portion of the inner needle 6 is urged to the rear end side (Y1 side) by the urging means 40, and the rear end of the shaft body 1. Arranged on the side.
In the initial state, the outer needle joint 20 that holds the outer needle 5 has a rear end fitted to the tip of the slider 10, and both the inner needle 6 and the outer needle 5 are cylinders of the shaft body 1. It is designed to be stored inside.

Specifically, in the initial state, as shown in FIG. 16A, the distal end portion of the slider 10 is detachably inserted into the through hole 20 c 1 of the proximal end portion 20 c of the outer needle joint 20.
When the tip of the slider 10 is inserted into the through hole 20c1 of the outer needle joint 20, the inner needle 6 held by the slider 10 constitutes the outer needle joint 20 as shown in FIG. The inner cylinder 20 a is inserted through the cylinder and the outer needle 5, and the tip of the inner needle 6 protrudes forward from the outer needle 5.

Next, the operation when the indwelling needle syringe W of this embodiment is changed from the initial state to the puncture use state will be described.
When using the indwelling needle syringe W in the initial state shown in FIG. 2, the user applies a finger or the like to the operation piece 10 d of the slider 10 and presses the operation piece 10 d toward the distal end side of the shaft body 1 ( The load is applied in the Y2 direction), the slider 10 is moved to the tip end side of the shaft body 1, and the claw portion 10d1 of the operation piece 10d is locked in the locking hole 1b formed in the shaft body 1.
As a result, as shown in FIGS. 3 and 4, the indwelling needle syringe W is maintained in the puncture use state in which the outer needle 5 and the inner needle 6 protrude from the opening 2 a 1 at the distal end portion of the front shaft 2.

Further, as described above, when the slider 10 is moved to the distal end side of the shaft body 1, as shown in FIG. 17, the outer needle joint 20 fitted to the distal end of the slider 10 is moved to the shaft body 1 (FIG. 17). (Not shown) is inserted into the cylinder of the tip shaft 2 attached to the tip end portion.
Further, when the outer needle joint 20 is inserted into the cylinder of the front shaft 2, the locking portion 20b2 of the outer cylinder portion 20b constituting the outer needle joint 20 is locked in the locking hole 2b of the front shaft 2. It has become so. Thereby, the outer needle joint 20 holding the outer needle 5 is fitted into the cylinder of the tip shaft 2 (see FIGS. 2 and 4) to which the wing 3 is fitted and fixed.
In addition, the structure which fits the outer needle joint 20 mentioned above and the front axis | shaft 2 is an example to the last, and is not specifically limited to this. For example, you may be comprised so that it can fit by rotating the front-end | tip of the outer needle coupling 20 with respect to the front axis | shaft 2. FIG. Further, for example, a thread is provided on the outer peripheral surface of the outer needle joint 20, and a thread groove that is screwed into the thread is provided in the cylinder of the tip shaft 2, so that the outer needle joint 20 and the tip shaft 2 are threaded. You may make it match.

Thus, in the present embodiment, the outer needle 5 and the inner needle 6 are housed inside the shaft body 1 in a state before use, and the outer needle 5 and the wing part 3 are arranged in a separated state.
Then, after the stage of actual use, the outer needle 5 and the inner needle 6 are projected from the front shaft 2 and the wing 3 is attached to the outer needle 5.
Therefore, the indwelling needle syringe W of this embodiment can be handled safely and hygienically.

Next, a method of using the indwelling needle syringe W in the puncture use state will be described.
The user punctures the outer needle 5 and the inner needle 6 of the indwelling needle syringe W into the blood vessel of the patient when the indwelling needle syringe W is in a puncture use state by the above-described operation.
Next, the user fixes the wing 3 to the patient's arm or hand with tape.

And after fixing the wing | blade part 3 with a tape, a user cancels | releases the latching | locking of the nail | claw part 10d1 of the operation piece 10d of the slider 10. FIG.
By this operation, as shown in FIG. 18, the slider 10 holding the rear end of the outer needle 5 is urged to the rear end side by the urging means 40 (not shown in FIG. 18) (rearward by the urging force F1). Urged toward the end side), disengages from the outer needle joint 20 fitted to the front shaft 2, and retreats toward the rear end side of the shaft body 1. Thereby, only the inner needle 6 held by the slider 10 out of the outer needle 5 and the inner needle 6 punctured into the blood vessel is pulled out of the blood vessel and stored in the shaft body 1.

In this embodiment, the fitting force F2 (see FIG. 18) between the outer needle joint 20 and the tip shaft 2 is the fitting force F3 between the tip of the slider 10 and the outer needle joint 20 (see FIG. 16 (b)). (F2> F3).
Further, the urging force F1 (see FIGS. 16 and 18) in the Y1 direction that the slider 20 receives from the urging means 40 is smaller than the fitting force F2 between the outer needle joint 20 and the front shaft 2, and the slider 10 and the outer It is designed to be larger than the fitting force F3 with the needle joint 20 (| F2 |> | F1 |> | F3 |).
Further, the fitting force F4 (not shown) between the shaft body 1 and the front shaft 2 is designed to be larger than the fitting force (F2) between the outer needle joint 20 and the front shaft 2 (F4> F2). ).
With this configuration, by releasing the claw portion 10d1 of the operation piece 10d of the slider 10, the slider 10 is automatically detached from the outer needle joint 20 fitted to the front shaft 2, and together with the inner needle 6 held by itself. The shaft body 1 is retracted to the rear end side and stored in the shaft body 1.

Thereafter, as shown in FIG. 19, only the outer needle 5 held by the outer needle joint 20 fitted to the front shaft 2 protrudes to the outside (only the outer needle 5 is punctured into the blood vessel). For the indwelling needle syringe W, the user removes the shaft body 1 from the front shaft 2 (in the state shown in FIG. 6), and connects an infusion tube or the like to the rear end portion of the front shaft 2, An infusion line can be formed.
The shaft body 1 storing the inner needle 6 removed from the front shaft 2 is disposed of, but since the inner needle 5 is stored in the shaft body 1, the occurrence of a needle stick accident is suppressed. The

As described above, according to the present embodiment, an indwelling needle injector that can be handled safely and hygienically before and after use can be provided.
In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible in the range of the summary.

In the above-described embodiment, the urging means 40 is disposed on the rear end side of the shaft body 1, but this is only an example.
For example, the urging means 40 is disposed on the distal end side of the shaft body 1, and the urging means 40 faces the rear end side of the shaft body 1, and the slider 10 (and the outer needle joint 20 fitted to the slider 10). (In this case, for example, a compression coil spring can be used for the urging means 40).

Further, for example, in the above-described embodiment, the slider 10 is urged toward the rear end side of the shaft body 1 by the urging means 40, but is not particularly limited thereto. If the slider 10 is formed so that it can be maintained at the position of the initial state (the state shown in FIG. 2), it can be handled safely and hygienically as in the above-described embodiment without providing the biasing means 40. Can do.
When the urging means 40 is not provided as described above, when the indwelling needle syringe W in the puncture use state shown in FIG. 3 is punctured into the blood vessel of the patient, the user operates the operation piece 10d of the slider 10. The shaft body 1 may be slid along the guide groove 1a.

  Moreover, although the wing | blade part 3 showed the example by which the outer periphery part of the tip shaft 2 was externally fixed by the embodiment mentioned above, the wing | blade part 3 should just be fixed to the tip shaft 2, and the fixation The method is not particularly limited.

W Indwelling needle syringe 1 Shaft body 1a Guide groove (shaft body)
1b Locking hole (shaft body)
2 Front shaft 2a1 Opening (front shaft)
2a2 Opening (front axis)
2b Locking hole (front shaft)
3 Wings 4 Tail plugs 4a Upper surface (tail plug)
4b Opening (tail plug)
4c Tubular part (tail plug)
5 Outer needle 6 Inner needle 10 Slider 10a Inner needle holder (slider)
10b Spring receiving part (slider)
10c Guide protrusion (slider)
10d Operation piece (slider)
10d1 Claw (slider)
20 Outer needle joint 20a Inner cylinder (outer needle joint)
20a1 opening (inner cylinder (outer needle joint))
20a2 opening (inner cylinder (outer needle joint))
20b Outer cylinder (outer needle joint)
20b1 Notch (outer cylinder part (outer needle joint))
20b2 Locking part (outer cylinder part (outer needle joint))
20c Base end (outer needle joint)
20c1 through hole (base end ((outer needle joint))
40 Energizing means

Claims (5)

In an indwelling needle syringe comprising a soft outer needle formed in a hollow cylindrical shape and a hard inner needle that is removably inserted into the outer needle cylinder,
A hollow cylindrical shaft having both ends penetrating;
A tip shaft detachably attached to the tip of the shaft body;
A wing portion fixed to the tip shaft;
A slider that is housed in a cylinder of the shaft body and is movable in the axial direction of the shaft body, and that holds the inner needle at the tip thereof;
An outer needle joint that is detachably fitted to the tip side of the slider and holds the outer needle at the tip portion;
In an initial state before use, the slider is disposed on the rear end side of the shaft body, and the outer needle joint is fitted to a tip portion thereof, and both the inner needle and the outer needle are placed in the shaft body. Stowed,
When the slider in the initial state is moved to the distal end side of the shaft body, the outer needle joint moves to the distal end side of the shaft body together with the slider, and enters the cylinder of the front shaft to which the wing portion is fixed. inserted through, while being fitted to the tip axis, wherein the inner needle and the outer needle is protruded from the front barrel puncture state and without,
And the fitting force between the outer needle joint and the tip shaft is formed larger than the fitting force between the outer needle joint and the tip of the slider,
When the slider is retracted from the puncture state toward the rear end side of the shaft body, the slider is detached from the outer needle joint, and the inner needle is accommodated in the shaft body,
Further, the indwelling needle injector is characterized in that the tip shaft is detached from the tip end portion of the shaft body . When the outer needle joint is fitted to the tip of the slider, the inner needle held by the tip of the slider is inserted through the cylinder of the outer needle held by the outer needle joint, and the tip is Protruding from the tip of the outer needle,
When the slider in the initial state is moved to the distal end side of the shaft body, the outer needle joint is fitted and fixed in the cylinder of the tip shaft, and the inner needle and the outer needle protrude from the tip shaft. The indwelling needle injector according to claim 1, wherein The shaft body is provided with a biasing means for biasing the slider toward the rear end side of the shaft body,
The initial state is characterized in that the slider and the outer needle joint fitted to the slider are urged by the urging means and arranged on the rear end side of the shaft body. The indwelling needle syringe of Claim 1 or Claim 2. A guide groove extending in the axial direction of the shaft body is formed on the surface of the shaft body,
The slider includes an operation portion that is slidably inserted into the guide groove, and is movable in the axial direction of the shaft body by moving the operation portion along the guide groove.
The operation portion is detachably engageable with the distal end side of the shaft body,
When the operation portion of the slider in the initial state is moved to the distal end side of the shaft body and locked to the distal end side of the shaft body, the outer needle joint fitted to the slider is placed in the cylinder of the front shaft. And the state where the inner needle and the outer needle protrude from the tip shaft is maintained,
Further, when the locking is released, the slider is urged toward the rear end side of the shaft body by the urging means, and is disengaged from the outer needle joint fitted to the front shaft, and holds the inner needle. The indwelling needle injector according to any one of claims 1 to 3, wherein the indwelling needle injector is retracted to a rear end side of the shaft body and is accommodated in the shaft body.   By removing the shaft body that houses the slider that holds the inner needle from the front shaft to which the outer needle joint that holds the outer needle is fitted, and by connecting an infusion tube to the rear end side of the front shaft, The infusion needle injector according to claim 4, wherein an infusion line is formed.

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