TWI803665B - indwelling needle assembly - Google Patents

Abstract

The invention provides an indwelling needle assembly capable of completely discharging the blood retained in the outer needle base in a short time. This indwelling needle assembly (1) has: an outer needle (2); an outer needle base (3); a hollow cylindrical member (4); a hemostatic valve (44), which has a slit (45) that can be opened and closed freely and an inner Embedded in the hollow cylindrical member (4); and the connecting member (5), when the hollow cylindrical member (4) is pressed toward the front end, its base end is inserted into the slit (45) of the hemostatic valve (44) )Inside. The outer needle base (3) has: a small diameter portion (34), a large diameter portion (33) extending from the front end side of the small diameter portion (34). The base end side of the hollow cylindrical member (4) has a first notch (41), and its outer peripheral surface has an air channel (43) connecting the front end (42) and the first notch (41), which can be automatically The base end position advances toward the front end position; the second notch (54) of the protrusion (53) of the connecting member (5) opens in a direction different from that of the first notch (41).

Description

indwelling needle assembly

The invention relates to an indwelling needle assembly.

Previously, an indwelling needle assembly has been known (for example, refer to Patent Document 1). The conical part of the inducer connected to the terminal of the inducer; the breathable hemostatic valve arranged inside the outer needle base; and the connecting member used to open and close the hemostatic valve.

In the above-mentioned indwelling needle assembly, the above-mentioned hemostatic valve is composed of a hollow bottomed cylindrical body, and a slit that can be opened and closed freely is provided at the bottom of the bottomed cylindrical body. On the other hand, the connecting member is formed of a hollow bottomed cylindrical body integrally formed with the inner front end portion of the outer needle base. The slit of the connecting member toward the hemostatic valve is tapered, and the hemostatic valve is opened by being inserted into the slit.

In the aforementioned indwelling needle assembly system, the inner needle is inserted from the base end through the inside of the hemostatic valve into the outer needle, and the sharp front end of the inner needle protrudes from the front end of the outer needle to puncture the vein. blood vessels. At this time, the inner needle has an opening between the hemostatic valve and the connecting member that opens into the outer needle base, and when it is pierced into a blood vessel, blood flows out from the opening to the inside of the outer needle base. . Therefore, the outer needle base is made of a transparent or translucent material, and the penetration of the inner needle into the blood vessel can be confirmed by visually recognizing the blood flowing out from the opening.

When the inner needle punctures the blood vessel, the outer needle is advanced along the inner needle to puncture the blood vessel. Then, by pulling out the above-mentioned inner needle in the state of the above-mentioned outer needle piercing the blood vessel, the outer needle will be left in the state of piercing the blood vessel.

According to the above-mentioned indwelling needle assembly, when the inducer terminal provided at the front end of the transfusion device or the like is inserted into the base end while the outer needle is pierced into the blood vessel, the hemostatic valve is pressed by the inducer terminal, thereby , the connecting member is inserted into the slit of the hemostatic valve to open the hemostatic valve. As a result, the liquid medicine or the like supplied from the infusion device is sent into the blood vessel through the outer needle.

However, if the blood flowing out to the inside of the outer needle base remains as it is, there will be a problem of becoming a breeding source of bacteria or a source of thrombus.

In order to solve the above problems, the industry has proposed a method of disposing the above-mentioned connecting member on the base end side of the above-mentioned hemostatic valve, so that the above-mentioned connecting member is pressed toward the front end side by the above-mentioned inducer terminal and inserted into the above-mentioned slit. An indwelling needle assembly having a notch on the side of the front end of the connecting member (for example, see Patent Document 2).

According to the indwelling needle assembly described in the above-mentioned Patent Document 2, the liquid medicine etc. supplied from the above-mentioned infusion device can flow out from the cutout part provided on the side surface of the front end part of the above-mentioned connecting member, so that the blood stagnant in the base of the outer needle can be released. The blood inside the seat washes and flows into the blood vessels. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese National Publication No. 2016-506855 [Patent Document 2] Japanese Patent No. 5651597

[Problems to be solved by the invention]

However, according to the indwelling needle assembly described in the above-mentioned Patent Document 2, the liquid medicine flows out from the notch provided on the side of the front end of the connecting member protruding from the front end side of the slit of the hemostasis valve, so the liquid medicine flows out from the side of the front end of the connecting member protruding from the front end of the slit of the hemostatic valve. Inside, the discharge of the blood stagnated in the area far from the notch at the front end of the connecting member takes time, or the discharge is incomplete, which is inconvenient.

The purpose of the present invention is to eliminate these inconveniences and provide an indwelling needle assembly capable of completely draining the blood stagnated inside the outer needle base in a short time. [Means to solve the problem]

In order to achieve the above object, the indwelling needle assembly of the present invention is characterized in that it has: an outer needle, which is composed of a hollow cylindrical body, and is indwelled in a state of being punctured into a blood vessel; an outer needle base, which is composed of a hollow cylindrical body The outer needle is supported by the front end, and the inducer conical portion is provided at the base end to be connected to the inducer terminal; the hollow cylindrical member is disposed on the base end side inside the outer needle base; the hemostatic valve, It has a slit that can be opened and closed freely on the surface perpendicular to the axial direction of the outer needle base, and is embedded in a hollow cylindrical member; and a connecting member, which is arranged at the front end of the outer needle base, When the hollow cylindrical member is pressed toward the front end by the inducer terminal, it is inserted into the slit of the hemostatic valve, and communicates with the front and rear of the slit; and the outer needle base has: a conical portion compared with the inducer A small diameter portion located on the front end side, and a large diameter portion extending from the small diameter portion to the front end side; the hollow cylindrical member has a first notch on its base end side, and the outer peripheral surface has a front end portion and the first cutout portion. 1. The cutout part is connected to allow the passage of gas and prevent the passage of liquid on the other hand. The hollow cylindrical member can be directed toward at least the first cutout part from the base end position where its outer peripheral surface abuts the small-diameter part. A part is disposed at the front end of the large-diameter portion; the connecting member has at least one second notch, and has a protrusion for inserting into the slit of the hemostatic valve, and the second notch is in contact with the first The notches open in different directions.

In the indwelling needle assembly of the present invention, in the state where the hollow cylindrical member is located at the base end position, the inner needle is inserted from the base end, and the inner needle is inserted through the hemostatic valve as in the above-mentioned indwelling needle assembly. The inside of the above-mentioned outer needle, and the sharp front end of the inner needle is pierced into the blood vessel of the vein. Then, make the blood flow out from the opening of the inner needle to the inside of the outer needle base. At this time, although there is air inside the outer needle base, the indwelling needle assembly of the present invention has the above-mentioned air channel part formed on the outer peripheral surface of the above-mentioned hollow cylindrical member, so the air is exhausted to the above-mentioned air channel part through the air channel part. 1st missing part. The air channel part allows gas to pass through, and on the other hand, prevents liquid from passing through, so the blood cannot pass through the air channel part substantially, and the inside of the outer needle base is smoothly filled with the blood.

If the inner needle is pierced into the blood vessel, the outer needle can be left in the state of piercing the blood vessel by advancing the outer needle along the inner needle to penetrate the blood vessel and then pulling out the inner needle.

Next, when the inducer terminal provided on the front end of the infusion device etc. is inserted into the base end of the indwelling needle assembly in the state where the outer needle is pierced into the blood vessel, the hollow cylindrical member is pressed by the inducer terminal, Thereby, it advances from the said base end position to the said front end position. In this way, the protruding portion of the connecting member is inserted into the slit of the hemostatic valve to open the hemostatic valve and communicate the front and back of the slit. As a result, the medical solution or the like supplied from the infusion device passes through the inside of the hollow cylindrical member and the second notch of the connecting member, and is sent into the blood vessel through the outer needle.

At this time, in the indwelling needle assembly of the present invention, the hollow cylindrical member is located at the base end position, at least a part of the first notched portion is arranged at the large diameter portion, and the outer peripheral surface of the hollow cylindrical member is in contact with the base end. There are gaps between the inner peripheral surfaces of the outer needle bases. Therefore, a part of the above-mentioned liquid medicine etc. flows out into the outer needle base from the first notch of the hollow cylindrical member through the gap between the outer peripheral surface of the hollow cylindrical member and the inner peripheral surface of the outer needle base. , and the blood filled inside the outer needle base is pressure-fed to the above-mentioned outer needle from the second notch of the connecting member.

Therefore, according to the indwelling needle assembly of the present invention, the blood stagnated inside the outer needle base can be completely discharged in a short time, and can be returned to the blood vessel from the second notch through the outer needle. Also, in the indwelling needle assembly of the present invention, since the second notch opens in a direction different from that of the first notch, in order to allow the fluid flowing from the first notch into the outer needle base The above-mentioned liquid medicine and the like flow into the second notch, which flows in a swirl along the inner peripheral surface of the outer needle base, so the blood stagnated in the inner of the outer needle base can be further discharged completely in a short time.

In the indwelling needle assembly of the present invention, it is preferable that the second notch opens in a direction perpendicular to the first notch. If so, when the above-mentioned liquid medicine etc. flowing out from the above-mentioned first notch into the above-mentioned outer needle base flows into the second notch and swirls along the inner peripheral surface of the outer needle base, it will flow from the first notch. The flow lengths of the liquid medicine etc. from the notch outflow to the second notch are equal. Therefore, the stagnant blood inside the outer needle base can be efficiently discharged.

Also, in the indwelling needle assembly of the present invention, the connecting member may be integrally formed with the outer needle base, but it is preferably a separate body from the outer needle base.

Although the slit of the above-mentioned hemostatic valve is expected to be formed in the center of the bottom surface of the hemostatic valve composed of a hollow cylindrical body with a bottom, if the slit is deviated from the center due to processing accuracy, the above-mentioned connecting member will be present. It is difficult to insert the slit. However, in the indwelling needle assembly of the present invention, when the above-mentioned connecting member and the above-mentioned outer needle base are separate bodies, they can be inclined at any angle with respect to the axis of the outer needle base. Therefore, when the above-mentioned connection member is tilted to point to the slit of the hemostatic valve, the connection member can be inserted into the slit, and it can also be accommodated when the slit is deviated from the center of the bottom surface of the hemostatic valve.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1A, the indwelling needle assembly 1 of this embodiment includes: an outer needle 2 made of a hollow cylindrical body, an outer needle base 3 supporting the outer needle 2 with a front end, and an outer needle base 3 arranged on the outer needle base. The base end side hollow cylindrical member 4 inside the base 3 and the connecting member 5 arranged between the outer needle 2 and the hollow cylindrical member 4 at the end inside the outer needle base 3 .

The outer needle base 3 is a hollow cylindrical body made of transparent or translucent resin, and has: a small-diameter support portion 31 formed at the front end to support the outer needle 2, and gradually expands from the support portion 31 toward the base end. The enlarged diameter portion 32 of the diameter, the large diameter portion 33 connected to the base end side of the enlarged diameter portion 32, the small diameter portion 34 connected to the base end side of the large diameter portion 33, and the base end side connected to the small diameter portion 34 and The conical portion 35 of the inducer gradually expands in diameter from the small diameter portion 34 toward the base end portion. In other words, the outer needle base 3 has a small-diameter portion 34 located on the front end side relative to the inducer conical portion 35 , and a large-diameter portion 33 extending from the small-diameter portion 34 on the front end side.

The hollow cylindrical member 4 has, for example, a pair of first cutouts 41 , 41 on the base end side, and the first cutouts 41 , 41 are provided symmetrically with respect to the axis of the hollow cylindrical member 4 . Furthermore, the hollow cylindrical member 4 has a plurality of air grooves 43 connecting the front end 42 and the first notch 41 on the outer peripheral surface between the front end 42 and the first notch 41 . The vent groove portion 43 has a width of, for example, 100 to 200 μm, and is configured to allow gas such as air to pass through while suppressing the passage of liquid such as blood.

Furthermore, the hollow cylindrical member 4 can be arranged at least a part of the first notched portion 41 on the front end side from the base end position where the outer peripheral surface of the front end portion 42 abuts the small diameter portion 34 on the large side. The front end position of the diameter portion 33 advances, and a hemostasis valve 44 made of a hollow cylindrical body with a bottom is embedded in the front end portion 42 . The hemostatic valve 44 is made of soft resin, and has a slit 45 that can be opened and closed freely on the surface perpendicular to the axial direction of the outer needle base 3 , that is, the bottom surface. Also, the hemostatic valve 44 can be in the shape of a disc or a solid cylinder.

As shown in FIG. 1B, the connecting member 5 is made of hard resin, has a conical fitting portion 51 that is loosely fitted in the enlarged diameter portion 32 inside the outer needle base 3, and is connected to the rear end side of the fitting portion 51. Insert the insertion portion 52 of the slit 45 . The insertion portion 52 has a smaller diameter than the fitting portion 51, and is formed to gradually decrease in diameter toward the rear end. The fitting part 51 has a first U-shaped groove part 53 formed along the axis from its front end toward the base end side and opened on the side surface of the fitting part 51. The second U-shaped groove portion 54 on the side symmetrical to the first U-shaped groove portion 53 . The first U-shaped groove portion 53 communicates with the second U-shaped groove portion 54 at the boundary between the fitting portion 51 and the insertion portion 52 through the communication hole 55 . Also, the insertion portion 52 includes a flat portion 56 on a side symmetrical to the opening of the second U-shaped groove portion 54 with respect to the axis.

In the connection member 5, the second notch is formed by the first U-shaped groove 53 and the second U-shaped groove 54, and the first U-shaped groove 53 and the second U-shaped groove 54 open in directions different from the first notch 41, respectively. For example, the opening is in a direction perpendicular to the connecting line of the pair of first notches 41 .

Next, the operation of the indwelling needle assembly 1 of this embodiment will be described.

When using the indwelling needle assembly 1, first, as shown in FIG. 1, the hollow cylindrical member 4 is located at the base end position where the outer peripheral surface of the front end portion 42 is in full contact with the small diameter portion 34. The inner needle is inserted into the slit 45 of the hemostatic valve 44 from the base end of the conical portion 35 of the inducer. When the hollow cylindrical member 4 is located at the base end state, the claws 53 , 53 of the connecting member 5 are not inserted into the slit 45 of the hemostatic valve 44 .

Then, the above-mentioned inner needle that has been inserted into the slit 45 of the hemostatic valve 44 is inserted into the inside of the outer needle 2 through the second notch portion (the second U-shaped groove portion 54 and the first U-shaped groove portion 53) of the connecting member 5, and the The sharp front end of the inner needle protrudes from the front end of the outer needle 2 to puncture the blood vessel of the vein. The above-mentioned inner needle has an opening opened to the large-diameter portion 33 of the outer needle base 3 between the hemostasis valve 44 and the connecting member 5. If the needle is punctured into a blood vessel, blood will pass through the opening. It flows out (returns) to the inside of the large-diameter portion 33 .

At this time, although there is air inside the large-diameter portion 33, the air is exhausted from the front end portion 42 to the first notch portion 41 through the air channel portion 43 formed on the outer peripheral surface of the hollow cylindrical member 4, and the large-diameter portion 33 The interior is smoothly filled with the aforementioned blood. Also, the vent groove part 43 allows gas such as air to pass through, but on the other hand, it can inhibit the passage of liquid such as blood.

Also, at this time, since the outer needle base 3 is made of transparent or translucent resin, the inside of the large-diameter portion 33 can be seen through from the outside, and the blood inside the large-diameter portion 33 can be seen through to confirm the penetration of the above-mentioned inner needle. Blood vessel.

Next, when the inner needle punctures the blood vessel, the outer needle 2 is advanced along the inner needle to puncture the blood vessel. Then, by pulling out the above-mentioned inner needle in the state where the outer needle 2 is pierced into the blood vessel, the outer needle 2 can be left in the state where the outer needle 2 is pierced into the blood vessel.

Next, in the indwelling needle assembly 1 , as shown in FIG. 3 , the inducer terminal 6 provided at the front end of the infusion set or the like is inserted into the inducer conical portion 35 . If so, the hollow cylindrical member 4 is pushed toward the front end side by the inducer terminal 6 and advances toward the front end position, so that at least a part of the first notched portion 41 is disposed on the large diameter portion 33 . Also, at the same time, the insertion portion 52 of the connecting member 5 is inserted into the slit 45 of the hemostatic valve 44 to open the hemostatic valve 44 . As a result, the insertion portion 52 of the connection member 5 makes the slit 45 communicate front and rear, and the liquid medicine supplied from the above-mentioned infusion device passes through the hemostatic valve 44, the second U-shaped groove portion 54, and the first U-shaped groove portion 53. The outer needle 2 is sent into the blood vessel.

At this time, as shown in FIG. 4, the main flow _S1 of the above-mentioned liquid medicine etc. flows into the inside of the outer needle 2 from the hollow cylindrical member 4 through the second U-shaped groove portion 54 and the first U-shaped groove portion 53 of the connecting member 5. The hollow cylindrical member 4 has a first notch 41 , and at the front end position, there is a gap between the outer peripheral surface of the front end portion 42 and the inner peripheral surface of the large diameter portion 33 of the outer needle base 3 . Therefore, part of the above-mentioned liquid medicine flows into the large-diameter portion 33 from the first notch portion 41 through the gap between the outer peripheral surface of the front end portion 42 and the inner peripheral surface of the large-diameter portion 33 of the outer needle base 3 to form a branch flow S ₂ . Thereby, even if blood invades the vent groove portion 43, the blood can be washed toward the large diameter portion 33 by the branch flow _S2 of the above-mentioned medical solution or the like. Then, the tributary flow _S2 and the like of the chemical solution and the like flow into the second U-shaped groove portion 54 and merge with the main flow _S1 . Furthermore, a part of the branch _S2 forms a _branch S3 flowing along the flat portion 56 formed on the side symmetrical to the second U-shaped groove 54 relative to the axis, and the branch _S3 flows into the first U-shaped groove 53 and merges with the main flow _S1 .

As a result, the blood filling the large-diameter portion 33 can flow into the outer needle 2 from the second U-shaped groove portion 54 and the first U-shaped groove portion 53 through the tributaries S ₂ and S ₃ of the above-mentioned medicinal liquid, and the blood can be absorbed in a short time. The inside is completely discharged from the inside of the outer needle base 3 .

At this time, the second U-shaped groove portion 54 and the first U-shaped groove portion 53 are opened in a direction perpendicular to the connecting line of the pair of first notch portions 41, 41, for example, so that the above-mentioned liquid medicine etc. flowing out of the first notch portion 41 The tributary _S2 flows into the second U-shaped groove 54 from around the front end 42 of the hollow cylindrical member 4 along the inner peripheral surface of the large-diameter portion 33 of the outer needle base 3, and the tributaries of the above-mentioned liquid medicine etc. _S3 flows from the flat part 56 into the first U-shaped groove part 53 from the periphery of the front end part 42 of the hollow cylindrical member 4 along the inner peripheral surface of the large-diameter part 33 of the outer needle base 3, so that the above-mentioned blood can be drawn Efficiently discharge from the inside of the outer needle base 3 .

Also, the slit 45 of the hemostatic valve 44 may deviate from the center (axis) of the hemostatic valve 44 due to machining accuracy. However, in the indwelling needle assembly 1 of the present embodiment, as shown in FIG. 1 , the fitting portion 51 of the connecting member 5 is loosely fitted with the enlarged diameter portion 32 of the outer needle base 3 , and the outer periphery of the fitting portion 51 There is a gap between the surface and the inner peripheral surface of the enlarged diameter portion 32 .

Therefore, the connecting member 5 can be inclined at any angle with respect to the axis of the outer needle base 3. When the slit 45 is deviated from the center of the hemostatic valve 44, the claws 53, 53 inclined relative to the axis of the outer needle base 3 point to the slit. When the slit 45 is made, the claws 53 , 53 can be inserted into the slit 45 .

Also, when the processing accuracy of the slit 45 of the hemostatic valve 44 is excellent, as shown in FIG. The diameter portion 32 is integrally formed. In the connecting member 5 shown in FIG. 4 , the insertion portion 52 is gradually reduced in diameter toward the rear end, and has a pair of second notched portions 57 on the side.

In addition, in this embodiment, since the outer needle base 3 is made of transparent or translucent resin, the blood inside the large-diameter portion 33 can be seen and confirmed that the above-mentioned inner needle has penetrated into the blood vessel. However, the outer needle base 3 may be made of opaque resin as long as the blood inside the large-diameter portion 33 can be confirmed from the outside.

1: Indwelling needle assembly 2: outer needle 3: Outer needle base 4: Hollow cylindrical member 5: Connecting components 6: Inducer terminal 33: Large diameter part 34: Small diameter department 35: The cone part of the inducer 41: The first notch 43: Ventilation groove 44: Hemostasis valve 45: Slit 53, 54, 57: the second notch

Fig. 1A is a perspective view showing a configuration example of the indwelling needle assembly of the present invention, and Fig. 1B is a partially enlarged perspective view of Fig. 1A. Fig. 2 is a sectional view taken along line II-II in Fig. 1 . Fig. 3 is an explanatory sectional view showing the operation of the indwelling needle assembly of the present invention shown in Fig. 1 . Fig. 4 is an explanatory perspective view showing the flow of the liquid medicine in the state shown in Fig. 3 . Fig. 5 is an explanatory sectional view showing another configuration example of the indwelling needle assembly of the present invention.

1: Indwelling needle assembly

2: outer needle

3: Outer needle base

4: Hollow cylindrical member

5: Connecting components

31: Support Department

32: Expanding part

33: Large diameter part

34: Small diameter department

35: The cone part of the inducer

41: The first notch

42: front end

43: Ventilation groove

44: Hemostasis valve

45: Slit

51: Fitting part

52: Insertion part

53: The second notch

54: The second notch

55: Connecting hole

56: flat part

Claims (3)

An indwelling needle assembly is characterized in that it has: The outer needle, which is composed of a hollow cylindrical body, is left in the state of puncturing into the blood vessel; An outer needle base, which is composed of a hollow cylindrical body, supports the outer needle with the front end, and has a conical part of the inducer at the base end that can be connected to the terminal of the inducer; a hollow cylindrical member disposed on the base end side inside the outer needle base; A hemostatic valve, which has a slit that can be opened and closed freely on a surface perpendicular to the axial direction of the outer needle base, and is embedded in a hollow cylindrical member; and A connecting member, which is arranged at the front end of the outer needle base, can be inserted into the slit of the hemostatic valve when the hollow cylindrical member is pressed toward the front end by the inducer terminal, and communicates with the slit before and after; and The outer needle base has: a small diameter portion located on the front end side compared with the conical portion of the inducer, and a large diameter portion extending on the front end side compared with the small diameter portion; The hollow cylindrical member has a first notch at its proximal end, and its outer peripheral surface has an air channel that connects the front end to the first notch to allow gas to pass through while suppressing the passage of liquid. The component can advance from the base end position where the outer peripheral surface abuts the small diameter portion toward the front end position where at least a part of the first notch is disposed on the large diameter portion; The connecting member has at least one second notch, and has a protrusion for inserting into the slit of the hemostatic valve, and the second notch opens in a direction different from that of the first notch. The indwelling needle assembly as claimed in item 1 of the scope of the patent application, wherein the above-mentioned second notch is opened in a direction at right angles to the above-mentioned first notch. The indwelling needle assembly as claimed in item 1 of the scope of the patent application, wherein the above-mentioned connecting member and the above-mentioned outer needle base are separate entities.

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