JP6978658B2 - Indwelling needle - Google Patents

Description

The present invention relates to an indwelling needle with a check valve.

Conventionally, an outer needle through which an inner needle can be inserted, an outer needle base provided at the base end of the outer needle, a hemostatic valve composed of an elastic member having a notch, and an inner peripheral surface of the hemostatic valve and the outer needle base. Indwelling needles are known to include, for example, a vent path for allowing air in a region formed between the inner peripheral surfaces of the outer needle base and defined by a hemostatic valve to escape to the outside of the outer needle base (eg,). , Patent Document 1).

This indwelling needle is removed by the blood (flashback) flowing into the outer needle and the outer needle base when the inner needle is inserted into the patient's blood vessel through the notch of the hemostatic valve and inserted into the outer needle. Air in the needle and outer needle base is expelled from the vent. Then, after confirming that the outer needle has been pierced into the blood vessel by the blood flowing into the outer needle base, the inner needle is pulled out. Then, the connector of the infusion line connected to the infusion bag is connected to the outer needle base to open the hemostatic valve, and a liquid such as an infusion solution or a drug solution is supplied to the patient.

Japanese Unexamined Patent Publication No. 2015-80707

In the conventional indwelling needle, the liquid supplied to the patient is supplied by opening the notch of the hemostatic valve, so that the flushback blood remains on the inner peripheral surface (particularly on the hemostatic valve side) of the outer needle base. There is a risk of causing problems such as the generation of thrombi due to the retention of blood, the propagation of germs, and the discomfort to patients who visually recognize the external needle group in which blood remains.

In view of the above points, it is an object of the present invention to provide an indwelling needle in which flashback blood does not easily remain on the outer needle base.

[1] In order to achieve the above object, the present invention
An outer needle through which the inner needle can be inserted (for example, the outer needle 2 of the embodiment; the same applies hereinafter) and
A cylindrical outer needle base provided at the base end of the outer needle (for example, the outer needle base 3 of the embodiment; the same applies hereinafter).
Indwelling provided with a hemostatic valve (for example, hemostatic valve 4 of the embodiment; the same applies hereinafter) that allows the inner needle to be inserted and prevents blood from leaking from the outer needle group after the inner needle is pulled out. A needle (for example, the indwelling needle 1 of the embodiment; the same applies hereinafter).
An inner cylinder member (for example, the inner cylinder member 6 of the embodiment; the same applies hereinafter) capable of advancing from the base end position to the tip end position is arranged in the outer needle base.
The hemostatic valve is provided on the inner cylinder member and is provided.
On the inner peripheral surface of the outer needle base, a small diameter portion (for example, the small diameter portion 7 of the embodiment; the same applies hereinafter) and a large diameter portion (for example, a large diameter portion located on the tip side of the small diameter portion and having a larger diameter than the small diameter portion). For example, the large diameter portion 8 of the embodiment; the same applies hereinafter) is provided.
A first through hole (for example, the first through hole 17 of the embodiment; the same applies hereinafter) and a second through hole (for example, the second through hole of the embodiment) that allow the outer peripheral surface and the inner peripheral surface of the inner cylinder member to communicate with each other. 18. The same shall apply hereinafter.)
The second through hole is located on the proximal end side of the outer needle group at a distance from the first through hole.
The inner cylinder member is provided with a ventilation filter (for example, the ventilation filter 14 of the embodiment; the same applies hereinafter) that blocks the passage of blood through the first through hole and allows the passage of air.
When the inner cylinder member is located at the base end position, the second through hole is located so that the small diameter portion prevents communication between the second through hole and the large diameter portion. The first through hole is located so that the air in the large diameter portion passes through the ventilation filter and can be discharged out of the outer needle group from the first through hole.
When the inner cylinder member is located at the tip position, the second through hole and the large diameter portion communicate with each other, and the liquid supplied into the inner cylinder member from the base end side of the outer needle base is the first. It is characterized in that the second through hole is located so that it can be supplied from the outer needle through the two through holes and the large diameter portion.

According to the present invention, when the inner cylinder member is located at the proximal end position, the second through hole provided in the inner cylinder member is not connected to the large diameter portion, and blood spills from the outer needle base by the hemostatic valve. Can be prevented. Then, when supplying a liquid such as an infusion solution or a chemical solution to the patient, by moving the inner cylinder member to the tip position, the second through hole provided in the inner cylinder member and the large diameter portion are connected, and the liquid is inside. It is supplied to the patient through the outer needle from around the hemostatic valve through the tubular member, the second through hole and the large diameter portion.

Therefore, unlike the conventional indwelling needle, the liquid is not supplied from the notch of the valve body, but the liquid is supplied from around the hemostatic valve, so that it remains on the inner peripheral surface (particularly on the hemostatic valve side) of the outer needle base. Easy flashback blood can be returned to the patient together with the liquid supplied to the patient, and it is possible to suppress the remaining of flashback blood on the outer needle base and suppress the discomfort to the patient or the like. ..

[2] Further, in the present invention, it is preferable that the ventilation filter is composed of an annular body and is inserted into the inner cylinder member to cover the first through hole from the inside.

As a method of attaching the ventilation filter, various attachment methods such as inserting the ventilation filter into the first through hole can be considered. As described above, the ventilation filter is composed of an annular body and inserted into the inner cylinder member. By attaching, the ventilation filter can be easily attached in the inner cylinder member. Further, even when a plurality of first through holes are provided at intervals in the circumferential direction, all the first through holes can be covered from the inside by a ventilation filter composed of one annular body, and the first through holes can be covered. Compared with the case where a ventilation filter is provided for each, the assembly process can be simplified.

Explanatory drawing which shows the indwelling needle of embodiment of this invention. Explanatory drawing which shows by disassembling the indwelling needle of this embodiment. FIG. 3 is a cross-sectional view showing a state in which the inner cylinder member of the indwelling needle of the present embodiment is located at the base end position. The perspective view which shows the state which the inner cylinder member of the indwelling needle of this embodiment is located at the tip position. The cross-sectional view which shows the state which the inner cylinder member of the indwelling needle of this embodiment is located at the tip position.

The indwelling needle of the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in the perspective view of FIG. 1 and the exploded view of FIG. 2, the indwelling needle 1 of the present embodiment is provided at the outer needle 2 through which the inner needle (not shown) can be inserted and at the base end of the outer needle 2. A tubular outer needle base 3, a hemostatic valve 4 that allows the inner needle to be inserted and prevents flashback blood from leaking from the outer needle base 3 after the inner needle is pulled out, and a hemostatic valve 4 inside the outer needle base 3. An annular ventilation filter 14 is provided, which allows air to pass from the proximal end side of the outer needle base 3 to the outside of the outer needle base 3 and suppresses or blocks the passage of blood in the flashback in the outer needle base 3. The ventilation filter 14 is made of a porous body (for example, a polyethylene sintered body or polyurethane) so as to suppress the passage of blood in the flashback and allow the passage of air.

A cylindrical inner cylinder member 6 is arranged in the outer needle base 3. The inner cylinder member 6 is movable in the outer needle base 3 toward the tip end of the outer needle base 3, and in the description of the embodiment, the initial position before moving toward the tip end is set to the base end position and the tip end direction. The position where the forward movement of is completed is defined as the tip position.

The hemostatic valve 4 is formed of a columnar elastic member, and is provided with a notch portion 4a cut from the tip end to the base end in the central portion. The inner needle (not shown) passes through the notch 4a and is inserted into the outer needle 2. Further, the hemostatic valve 4 is inserted into the inner cylinder member 6. A locking portion for preventing the hemostatic valve 4 from falling off is provided on the tip edge of the inner cylinder member 6 so as to project inward in the radial direction. Further, an annular ventilation filter 14 is also inserted into the inner cylinder member 6 so as to be continuous with the base end side of the hemostatic valve 4.

On the inner peripheral surface of the outer needle base 3, a small diameter portion 7 set to an inner diameter equal to the outer diameter of the inner cylinder member 6 (including substantially the same; at least set so that flashback blood cannot pass through). And a large diameter portion 8 which is located on the tip side of the small diameter portion 7 and has a larger diameter than the small diameter portion 7 is provided.

The inner cylinder member 6 is provided with four first through holes 17 which are arranged at equal intervals in the circumferential direction and communicate the outer peripheral surface and the inner peripheral surface of the inner cylinder member 6. Further, the inner cylinder member 6 is provided with four second through holes 18 on the base end side at intervals from the first through holes 17. The second through holes 18 are also arranged at equal intervals with intervals in the circumferential direction.

The first through hole 17 is covered from the inside of the inner cylinder member 6 by the ventilation filter 14.

As shown in FIG. 3, when the inner cylinder member 6 is located at the proximal end position in the outer needle base 3, between the inner peripheral surface of the outer needle base 3 and the outer peripheral surface of the inner cylinder member 6. The communication (connection) between the second through hole 18 and the large diameter portion 8 is blocked by the small diameter portion 7. Further, when the inner cylinder member 6 is located at the proximal end position, the air in the outer needle 2 and the outer needle base 3 is the first through hole 17 and when the flashback blood flows in from the outer needle 2. It is discharged from the base end opening of the outer needle base 3 through the ventilation filter 14 made of a porous body. The arrow in FIG. 3 indicates the flow in which the air in the large diameter portion 8 is discharged by the inflow of blood.

On the contrary, as shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. 5, when the inner cylinder member 6 is located at the tip position in the outer needle base 3, the second through hole 18 and the large diameter portion are formed. 8 is connected. The arrows in FIG. 5 indicate the flow of liquids such as infusions and chemicals.

According to the indwelling needle 1 of the first embodiment, when the inner cylinder member 6 is located at the proximal end position, the second through hole 18 provided on the outer peripheral surface of the inner cylinder member 6 is connected to the large diameter portion 8. It is blocked by the small diameter portion 7, and the hemostatic valve 4 can prevent the flashback blood from spilling from the outer needle base 3. Then, when supplying a liquid such as an infusion solution or a chemical solution to the patient, the inner cylinder member 6 is pushed to the tip position by using a male connector 11 connected to the outer needle base 3 or the like to move the inner cylinder member 6 to the tip position. The second through hole 18 and the large diameter portion 8 provided in the patient are communicated (connected) with each other, and the liquid passes through the outer needle 2 from around the hemostatic valve 4 through the second through hole and the large diameter portion 8. Is supplied to.

Therefore, unlike the conventional indwelling needle, the liquid is not supplied from the notch portion of the hemostasis valve 4, but the liquid is supplied from around the hemostasis valve 4, so that the inner peripheral surface of the outer needle base 3 (particularly hemostasis) is supplied. The flushback blood that tends to remain on the valve 4 side) can be returned to the patient together with the liquid supplied to the patient, suppressing the remaining flashback blood on the outer needle group 3 and causing thrombus generation due to blood retention. Alternatively, it is possible to suppress the propagation of various germs and the discomfort to the patient.

Further, since the inner peripheral surface and the outer peripheral surface of the inner cylinder member 6 are communicated with each other by the second through hole 18, the inner needle is inserted through the liquid such as the infusion solution or the chemical solution supplied from the base end of the outer needle group 3. The space inside the inner cylinder member 6 that is possible can also be used to supply the patient, and the resistance at the time of supplying the liquid can be reduced.

Further, as a method of attaching the ventilation filter, various attachment methods such as inserting the ventilation filter into the first through hole 17 can be considered. As described above, the ventilation filter 14 is composed of an annular body and the inner cylinder member. By inserting and attaching to 6, the ventilation filter 14 can be easily attached to the inner cylinder member 6. Further, even if four first through holes 17 are provided at intervals in the circumferential direction, all the first through holes 17 can be covered from the inside by the ventilation filter 14 made of one annular body, and the first through hole 17 can be covered from the inside. Compared with the case where a ventilation filter is provided for each through hole 17, the assembly process can be simplified. The ventilation filter 14 may be inserted for each first through hole 17. This also has the effect of making it difficult for the flashback blood of the present invention to remain in the outer needle base 3.

In the present embodiment, the hemostatic valve 4 provided in the inner cylinder member 6 has been described, but the hemostatic valve of the present invention is not limited to this, and for example, it protrudes forward to the tip edge of the inner cylinder member 6. A protruding portion is formed, and a protruding portion is formed on the outer peripheral surface of the tip of the protruding portion so as to bulge outward in the radial direction, and the protruding portion and the tip opening of the inner cylinder member 6 are normally closed. A hemostatic valve having a C-shaped cross section may be provided at the tip of the inner cylinder member 6.

Further, in the present embodiment, the second through hole 18 is formed so as to be formed at a distance from the base end of the inner cylinder member 6, but the second through hole of the present invention is the inner cylinder. It may be drilled by reaching the base end of the member 6.

Further, a rib for improving the strength may be provided on the inner peripheral surface of the inner cylinder member 6. Further, the number of the first through hole and the second through hole is not limited to four, and may be one or a plurality of the first through hole, and the number of the first through hole and the second through hole may be different. good.

1 Indwelling needle 2 Outer needle 3 Outer needle base 4 Hemostasis valve 4a Notch 6 Inner cylinder member 7 Small diameter part 8 Large diameter part 11 Male connector 14 Ventilation filter 17 1st through hole 18 2nd through hole

Claims (2)

The outer needle through which the inner needle can be inserted and the outer needle
A cylindrical outer needle base provided at the base end of the outer needle, and
An indwelling needle provided with a hemostatic valve that allows the inner needle to be inserted and prevents blood from leaking from the outer needle group after the inner needle is pulled out.
An inner cylinder member that can move forward from the base end position to the tip end position is arranged in the outer needle base.
The hemostatic valve is provided on the inner cylinder member and is provided.
The inner peripheral surface of the outer needle base is provided with a small diameter portion and a large diameter portion located on the tip end side of the small diameter portion and having a larger diameter than the small diameter portion.
A first through hole and a second through hole for communicating the outer peripheral surface and the inner peripheral surface of the inner cylinder member are provided.
The second through hole is located on the proximal end side of the outer needle group at a distance from the first through hole.
The inner cylinder member is provided with a ventilation filter that blocks the passage of blood through the first through hole and allows the passage of air.
When the inner cylinder member is located at the base end position, the communication between the second through hole and the large diameter portion between the inner peripheral surface of the outer needle base and the outer peripheral surface of the inner cylinder member is the small diameter. The second through hole is located so as to be blocked by the portion, and air in the large diameter portion passes through the ventilation filter from the first through hole and can be discharged to the outside of the outer needle group. The first through hole is located so as to be
When the inner cylinder member is located at the tip position, the second through hole and the large diameter portion communicate with each other, and the liquid supplied into the inner cylinder member from the base end side of the outer needle base is the first. An indwelling needle characterized in that the second through hole is located so as to pass through the two through holes and the large diameter portion and be able to be supplied from the outer needle. The indwelling needle according to claim 1.
The indwelling needle is characterized in that the ventilation filter is formed of an annular body, is inserted into the inner cylinder member, and covers the first through hole from the inside.

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