JP7000666B2 - 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).
A hemostatic valve (for example, the 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.
It is an indwelling needle equipped with
An inner cylinder member (for example, the inner cylinder member 6 of the embodiment; the same applies hereinafter) capable of advancing from the proximal end position to the distal end position in the outer needle base.
An annular shape located between the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer needle base to allow air in the outer needle base to pass and suppress or block the passage of blood in the outer needle base. (For example, the ventilation filter 14 of the embodiment; the same applies hereinafter) and the ventilation filter of the above are arranged.
The hemostatic valve is provided on the inner cylinder member and is provided.
In the outer needle base, a region on the tip end side of the outer needle base with respect to the tip end of the ventilation filter is designated as a tip region (for example, the tip region 16 of the embodiment; the same applies hereinafter).
The liquid supplied from the proximal end side of the outer needle group flows into the outer peripheral surface of the inner cylinder member, and at the proximal end position, the ventilation filter blocks the connection with the distal end region, and at the distal end position, the connection with the distal end region is blocked. It is characterized in that a flow path connected to the tip region (for example, the notch 9 of the embodiment; the same applies hereinafter) is provided.

According to the present invention, when the inner cylinder member is located at the base end position, the flow path provided on the outer peripheral surface of the inner cylinder member is not connected to the tip region, 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 tip of the flow path is located on the tip side of the ventilation filter and is placed on the outer peripheral surface of the inner cylinder member. The provided flow path and the tip region are connected, and the liquid is supplied to the patient through the outer needle from around the hemostatic valve via the flow path and the tip region.

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, on the inner peripheral surface of the outer needle base, a protrusion protruding inward in the radial direction for positioning the ventilation filter (for example, the protrusion 15 of the embodiment; the same applies hereinafter). ) Is provided, and it is preferable that the tip edge of the ventilation filter is locked to the protrusion when the inner cylinder member is located at least at the tip position. According to such a configuration, when the ventilation filter is arranged in the outer needle base, it is possible to prevent the inner cylinder member from being erroneously arranged ahead of the flow path when the inner cylinder member is in the tip position, and the positioning can be easily performed. can.

[3] Further, in the present invention, the flow path is composed of a notch portion notched from the base end to the tip end of the inner cylinder member (for example, the notch portion 9 of the embodiment; the same applies hereinafter). Can be done. According to such a configuration, by moving the inner cylinder member to the tip position and connecting the notch portion with the large diameter portion, it is possible to prevent the flashback blood from remaining on the outer needle base.

[4] Further, in the present invention, the cutout portion may be cut out so as to communicate the inner peripheral surface and the outer peripheral surface of the inner cylinder member. According to such a configuration, a liquid such as an infusion solution or a chemical solution supplied from the base end of the outer needle base can be supplied to the patient by using the inside of the inner cylinder member through which the inner needle can be inserted. Resistance can be reduced.

Explanatory drawing which shows the indwelling needle of embodiment of this invention. Explanatory drawing which shows by disassembling the indwelling needle of this embodiment. The cross-sectional view which shows the state which the inner cylinder member of the indwelling needle of this 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 4.

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. Further, the ventilation filter 14 is arranged between the outer peripheral surface of the inner cylinder member 6 and the inner peripheral surface of the outer needle base 3.

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 direction of the outer needle base 3, and in the description of the embodiment, the initial position before moving toward the tip end direction 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.

The inner peripheral surface of the outer needle base 3 is provided with a protruding portion 15 projecting inward in the radial direction for positioning the ventilation filter 14. The tip edge of the ventilation filter 14 is engaged with the protrusion 15 when the inner cylinder member 6 is located at least at the tip position. At this time, when the inner cylinder member 6 is not located at the tip position, the ventilation filter 14 needs to be positioned so as to prevent the connection between the cutout portion 9 and the tip region 16 described later.

By locking the ventilation filter 14 to the protrusion 15 in this way, it is possible to prevent the ventilation filter 14 from being erroneously placed ahead of the notch 9 when the inner cylinder member 6 is at the tip position, and positioning is easy. Can be done.

The inner diameter of the protruding portion 15 is set to be larger than the outer diameter of the inner cylinder member 6, and is configured so that the air in the outer needle base 3 is not blocked by the protruding portion 15 from the ventilation filter 14. The protruding portions 15 do not have to be annular, and may be provided at predetermined intervals in the circumferential direction.

The inner cylinder member 6 is formed with a pair of notches 9 notched from the base end toward the tip end. The cutout portion 9 is cut out so as to communicate the inner peripheral surface and the outer peripheral surface of the inner cylinder member 6. The notch 9 may be formed on the outer peripheral surface of the inner cylinder member 6 so that the infusion solution, the chemical solution, or the like is supplied from the proximal end side of the outer needle base 3, and the notch 9 does not necessarily reach the inner peripheral surface. You don't have to. The hemostatic valve 4 is located on the distal end side of the notch 9. Further, a rib 6a is provided on the inner peripheral surface of the inner cylinder member 6. The rib 6a compensates for the decrease in strength due to the formation of the notch 9.

Here, in the outer needle base 3, the region on the tip side of the outer needle base 3 with respect to the tip of the ventilation filter 14 is defined as the tip region 16.

As shown in FIG. 3, when the inner cylinder member 6 is located at the base end position in the outer needle base 3, the ventilation filter 14 blocks the connection between the cutout portion 9 and the tip region 16. 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 cutout portion 9 and the tip region 16 are formed. Be connected. The dotted arrow in FIG. 5 indicates the flow of liquid.

According to the indwelling needle 1 of the first embodiment, when the inner cylinder member 6 is located at the proximal end position, the notch 9 provided on the outer peripheral surface of the inner cylinder member 6 is connected to the tip region 16 by the ventilation filter 14. 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 notch 9 provided on the outer peripheral surface of the patient and the tip region 16 are connected, and the liquid is supplied to the patient through the notch 9 and the tip region 16 from around the hemostatic valve 4 through the outer needle 2.

Therefore, unlike the conventional indwelling needle, the liquid is supplied from around the hemostasis valve 4 without being supplied from the notch portion of 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. In the present embodiment, the notch 9 corresponds to the flow path of the present invention.

Further, since the cutout portion 9 is cut out so as to communicate the inner peripheral surface and the outer peripheral surface of the inner cylinder member 6, liquids such as infusion liquid and chemical liquid supplied from the base end of the outer needle base 3 can be removed. The space inside the inner cylinder member 6 through which the inner needle can be inserted can also be used to supply the patient, and the resistance at the time of supplying the liquid can be reduced.

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 one in which the ventilation filter 14 is positioned by the protruding portion 15 has been described. However, the configuration of the indwelling needle of the present invention is not limited to this, and for example, the ventilation filter 14 may be simply fixed to the inner peripheral surface of the outer needle base 3 by press fitting or the like without providing a protruding portion.

1 Indwelling needle 2 Outer needle 3 Outer needle base 4 Hemostasis valve 4a Notch 6 Inner cylinder member 6a Rib 9 Notch (flow path)
11 Male connector 14 Ventilation filter 15 Protruding part 16 Tip area

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
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.
It is an indwelling needle equipped with
An inner cylinder member that can move forward from the base end position to the tip end position in the outer needle base,
The hemostatic valve is inserted inside the inner cylinder member and can advance from the proximal end position to the distal end position together with the inner cylinder member.
An annular shape located between the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer needle base to allow air in the outer needle base to pass and suppress or block the passage of blood in the outer needle base. With a ventilation filter, is placed,
The outer peripheral surface of the inner cylinder member is notched so as to communicate the inner peripheral surface and the outer peripheral surface of the inner cylinder member or the notch portion cut out from the base end of the inner cylinder member toward the tip end. The notch forms a flow path,
In the outer needle base, the region on the tip side of the outer needle base with respect to the tip of the air flow filter is set as the tip region.
The liquid supplied from the proximal end side of the outer needle group flows into the flow path, and at the proximal end position, the tip of the flow path coincides with or is arranged on the proximal end side of the ventilation filter. As a result, the connection with the tip region is blocked by the ventilation filter, and at the tip position, the tip of the flow path is arranged on the tip side of the tip of the ventilation filter to be connected to the tip region. An indwelling needle featuring. The indwelling needle according to claim 1.
On the inner peripheral surface of the outer needle base, a protruding portion protruding inward in the radial direction is provided for positioning the ventilation filter.
An indwelling needle characterized in that the tip edge of the ventilation filter is locked to the protrusion when the cylindrical member is located at least at the tip position.

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