JPWO2019188607A1 - Catheter assembly and catheter hub - Google Patents

Abstract

The catheter assembly (10) includes a catheter (12), an internal needle (16), and a catheter hub (14). The catheter hub (14) has a hub body (20) provided with a connecting portion (26) that can be connected to the connector (30), and an extending portion (24) extending from the hub body (20). The extension portion (24) is a portion that comes into contact with the skin (S) in a state where the catheter hub (14) is fixed to the skin (S). With the connector (30) connected to the connection portion (26) of the hub body (20), the connector (30) is inserted between the connection portion (26) and the extension portion (24).

Description

The present invention relates to a catheter assembly and a catheter hub that are punctured and placed in a blood vessel when, for example, infusion is performed on a patient.

Conventionally, a catheter assembly used for infusion or the like to a patient is known. This type of catheter assembly consists of a hollow catheter, a catheter hub fixed to the base end of the catheter, a hollow inner needle that is inserted into the catheter and has a sharp needle tip, and the base end of the inner needle. It is equipped with a needle hub fixed to. This type of catheter and catheter hub is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-103504.

When using a catheter assembly, the catheter is inserted into the blood vessel by a predetermined length by advancing the catheter with respect to the inner needle after the inner needle and the tips of the catheter are punctured into the skin and blood vessels of the living body. .. After that, a connector connected to the infusion line (tube) is connected to the base end of the catheter hub. The catheter hub is fixed to the patient's skin with medical tape or the like.

In conventional catheter assemblies, the tip edge of the connector comes into direct contact with the skin when the catheter hub is secured to the skin. Therefore, the irritation to the skin is great, which may cause discomfort to the patient.

The present invention has been made in consideration of such a problem, and a catheter assembly and a catheter hub capable of reducing irritation to the skin and suppressing discomfort to a patient when the catheter hub is fixed to the skin. The purpose is to provide.

In order to achieve the above object, one aspect of the present invention is a catheter assembly comprising a catheter, an internal needle removably inserted into the catheter, and a catheter hub provided at the proximal end of the catheter. The catheter hub has a hub body provided with a connection portion that can be connected to a connector of a liquid feeding line, and an extension portion extending from the hub body, and the extension portion is the extension portion. The site where the catheter hub is fixed to the skin and comes into contact with the skin, and the connector is connected to the connection portion of the hub body, and the catheter hub is connected between the connection portion and the extension portion. A catheter assembly into which a connector is inserted.

According to this catheter assembly, the connector is inserted between the connection and the extension so that the tip edge of the connector does not come into direct contact with the skin. Therefore, it is possible to suppress giving discomfort to the patient.

The extending portion may extend in a direction inclined with respect to the axis of the hub body.

With this configuration, the tip side of the catheter hub can be compactly configured, and a gap into which the connector can be inserted can be formed between the extension portion and the hub body.

The extending portion may be elastically deformable in the direction of approaching and separating from the hub body.

With this configuration, the extension portion can be deformed according to the size of the connector, so that it is possible to support connectors of various sizes.

The extending portion may extend from a position closer to the tip side than the central portion in the length direction of the hub body.

With this configuration, the extending portion can be made relatively long, and an appropriate amount of elastic deformability can be secured.

Of the extending portion, at least a portion that can come into contact with the outer peripheral portion of the connector may be made of a hard material.

With this configuration, the load (load transmission) from the connector to the skin can be effectively suppressed.

A concave curved portion may be provided on the upper surface of the extending portion.

With this configuration, stress concentration due to the connector can be suppressed, and the load from the connector to the skin can be suppressed more effectively.

The extending portion may be a plate-shaped body.

With this configuration, since the extending portion has a certain thickness, the load on the skin can be further reduced.

The lower surface of the extending portion may be flat.

With this configuration, the contact pressure between the skin and the extending portion can be reduced, and the discomfort to the patient due to the contact can be further suppressed.

The width of the extension portion may be larger than the width of the hub body.

With this configuration, the stability of the catheter hub when fixed to the skin can be improved.

The extending portion may have a shape in which the width becomes wider toward the proximal end direction.

With this configuration, the width of the distal end side of the extension portion is relatively narrow, which can contribute to the compactness of the catheter hub. On the other hand, since the width is relatively wide on the proximal end side of the extension portion, the stability of the catheter hub when it is fixed to the skin can be improved.

The lower surface of the base end of the extending portion may be curved so as to approach the axis of the hub body toward the base end direction.

With this configuration, it is possible to reduce the load on the skin at the base end portion of the extending portion.

Another aspect of the present invention is a catheter hub provided at the base end of a catheter, which is a hub body provided with a connecting portion that can be connected to a connector of a liquid feeding line, and an extending portion extending from the hub body. The extension portion is a portion that comes into contact with the skin when the catheter hub is fixed to the skin, and the connector is connected to the connection portion of the hub body. A catheter hub in which the connector is inserted between the connecting portion and the extending portion.

According to the catheter assembly and the catheter hub of the present invention, the irritation to the skin can be reduced and the discomfort to the patient can be suppressed in the state where the catheter hub is fixed to the skin.

It is a perspective view of the catheter assembly which concerns on embodiment of this invention. It is a side view of the catheter hub of a catheter assembly. It is a top view of the catheter hub. It is an operation explanatory drawing of the catheter assembly. It is a perspective view of the catheter hub which concerns on other aspects. FIG. 5 is a cross-sectional view taken along the line VI-VI in FIG.

Hereinafter, a catheter assembly and a catheter hub according to the present invention will be described with reference to suitable embodiments with reference to the accompanying drawings.

The catheter assembly 10 whose initial state is shown in FIG. 1 is used when infusion, blood transfusion, or the like is performed on a patient (living body). The catheter assembly 10 can be configured as a peripheral venous catheter. The catheter assembly 10 may be configured as a catheter (eg, central venous catheter, PICC, midline catheter, etc.) that is longer than the peripheral venous catheter. Further, the catheter assembly 10 is not limited to the intravenous catheter, and may be configured as an arterial catheter such as a peripheral arterial catheter.

The catheter assembly 10 includes a catheter 12, a catheter hub 14 connected to the proximal end side of the catheter 12, an inner needle 16 removably inserted into the catheter 12, and a needle hub 18 connected to the inner needle 16. To be equipped. The catheter assembly 10 forms a double needle structure in which the catheter 12 and the inner needle 16 are stacked in the radial direction in the initial state before use.

The catheter 12 is a flexible medical capillary. A lumen is formed through the inside of the catheter 12. The length of the catheter 12 is not particularly limited and can be appropriately designed according to the application, various conditions and the like.

As the constituent material of the catheter 12, a resin material, particularly a soft resin material, is suitable. For example, as the soft resin material, a fluororesin such as polyurethane (PU), polytetrafluoroethylene (PTFE), ethylene / tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy alkane resin (PFA), and an olefin such as polyethylene. Examples include system resins.

The proximal end of the catheter 12 is fixed to the distal end within the catheter hub 14. The catheter hub 14 is exposed on the patient's skin S (see FIG. 4) with the catheter 12 inserted into the blood vessel, attached with tape or the like, and placed together with the catheter 12.

The catheter hub 14 has a hollow tubular hub body 20 and an extension portion 24 extending from the hub body 20 in the proximal direction. The base end portion of the catheter 12 is fixed to the tip end portion of the hub body 20. Inside the hub body 20, a hollow portion 21 is provided that communicates with the lumen of the catheter 12 and allows liquid to flow. A hemostatic valve (not shown) that prevents backflow of blood when the inner needle 16 is punctured and enables infusion when the connector 30 (see FIG. 4) of the infusion tube (liquid delivery line) is inserted into the hollow portion 21. A plug or the like may be accommodated.

As shown in FIG. 1, a connecting portion 26 that can be connected to a tubular connector 30 (see FIG. 4) having a female screw formed on an inner peripheral surface is provided at a base end portion of the hub main body 20. The connection portion 26 has a connection cylinder portion 26a and a pair of connection protrusions 26b protruding radially outward from the base end of the connection cylinder portion 26a. The pair of connecting protrusions 26b is a portion that functions as a male screw that is screwed with the female screw of the connector 30. The outer peripheral portion of the hub body 20 may be provided with a protruding tab for the user to operate the catheter hub 14 in the axial direction.

The extension portion 24 is a portion that comes into contact with the skin S while the catheter hub 14 is fixed to the skin S, and functions as a skin protector that prevents the tip edge 30b of the connector 30 from coming into direct contact with the skin S. It is a thing. The extending portion 24 extends (projects) from the lower portion of the hub main body 20 toward the base end.

As shown in FIG. 2, the extending portion 24 extends in a direction inclined with respect to the axis a of the hub main body 20. Specifically, the extending portion 24 is inclined in a direction away from the axis a of the hub main body 20 toward the proximal end direction. A gap G is formed between the extending portion 24 and the connecting portion 26 of the hub main body 20. The extending portion 24 faces the connecting portion 26 below the connecting portion 26 of the hub main body 20. With the connector 30 connected to the connection portion 26 of the hub body 20, the connector 30 is inserted between the connection portion 26 and the extension portion 24 (the gap G) (see FIG. 4).

The extending portion 24 extends from a position closer to the tip side than the central portion in the length direction of the hub main body 20. The lower surface 24a of the extending portion 24 is flat. The lower surface 24b of the base end portion of the extending portion 24 is curved so as to approach the axis a of the hub body 20 toward the base end direction. The portion of the extending portion 24 on the distal end side of the proximal end portion is configured to be substantially linear in side view.

Further, the lower surface 24a of the extending portion 24 is made of a soft material. Examples of the soft material constituting the extending portion 24 include vinyl chloride, silicone rubber (thermosetting elastomer), olefin-based thermoplastic elastomer, polybutadiene-based thermoplastic elastomer, and isoprene thermoplastic elastomer.

The extending portion 24 is a plate-shaped body. In the present embodiment, the extending portion 24 has a substantially flat plate shape. The extending portion 24 can be elastically deformed in the direction of approaching and separating from the hub main body 20. That is, the extending portion 24 has a spring property. The extending portion 24 has an appropriate thickness in order to prevent or suppress the load on the skin S by the connector 30. Therefore, the extending portion 24 is not in the form of a film and has at least a rigidity that does not bend due to its own weight.

In the present embodiment, the extension portion 24 is integrally molded with the hub main body 20. The extending portion 24 may be a separate component fixed to the hub main body 20. The catheter hub 14 may be provided with a pair of wings protruding from the hub body 20 on both the left and right sides. In this case, the pair of wings may project to the left or right from the root portion of the extension portion 24 (the connection point of the extension portion 24 with the hub body 20).

In FIG. 3, the width W2 (maximum width) of the extending portion 24 is larger than the width W1 (maximum width) which is the outer diameter of the hub main body 20. In a plan view, both ends of the extending portion 24 project outward from the hub body 20. The extending portion 24 has a shape in which the width increases toward the proximal end direction. Therefore, the extension portion 24 has a relatively narrow width on the tip end side of the extension portion 24 and a relatively wide width on the base end side of the extension portion 24. In a plan view, the edge portions 24e forming both ends in the width direction of the extension portion 24 are inclined with respect to the axis a of the hub body 20 in a direction away from the axis a of the hub body 20 toward the base end direction. There is.

The catheter hub 14 is made of a hard material such as a hard resin. The constituent material of the catheter hub 14 is not particularly limited, but for example, a thermoplastic resin such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, and methacrylate-butylene-styrene copolymer may be applied. The catheter hub 14 may be made of a soft material.

At least a part of the extending portion 24 may be made of a soft material such as a soft resin. In this case, in order to suppress the load on the skin S by the connector 30, it is preferable that at least the portion of the extending portion 24 that can come into contact with the outer peripheral portion of the connector 30 is made of a hard material. In the present embodiment, the extension portion 24 is integrally molded with the hub main body 20 by a hard material.

In FIG. 1, the inner needle 16 is formed of a hollow tube having rigidity capable of puncturing the skin S of a living body, and is arranged through the cavity of the catheter 12 and the hollow portion 21 of the catheter hub 14. The inner needle 16 is formed to have a total length longer than that of the catheter 12, and a sharp needle tip 16a is provided at the tip thereof. Examples of the constituent material of the inner needle 16 include stainless steel, aluminum or aluminum alloy, metal material such as titanium or titanium alloy, hard resin, ceramics and the like.

The needle hub 18 is fixed to the base end portion of the inner needle 16. In the initial state, the tip of the needle hub 18 is inserted into the base end of the catheter hub 14 (specifically, the hub body 20). The needle hub 18 can be detached from the catheter hub 14 in the proximal direction. The resin material constituting the needle hub 18 is not particularly limited, but for example, the material mentioned in the catheter hub 14 can be appropriately selected.

Next, the operation of the catheter assembly 10 configured as described above will be described.

In the use of the catheter assembly 10 shown in FIG. 1, the user performs a puncture operation of puncturing the catheter assembly 10 into the skin S of the patient. As a result, the tips of the inner needle 16 and the catheter 12 are punctured into the skin S and the blood vessel of the puncture target.

After the puncture, the user advances the catheter 12 while holding the catheter hub 14 while fixing the position of the needle hub 18. As a result, the catheter 12 is inserted to the target position in the blood vessel. Next, the user pulls the needle hub 18 toward the proximal end while holding the position of the catheter 12. As a result, the inner needle 16 is removed from the catheter 12 and the catheter hub 14 in the proximal direction.

Next, as shown in FIG. 4, the user provides the catheter 12 with the inner needle 16 removed and the catheter hub 14 on the proximal end side (the proximal end of the hub body 20) at the end of the infusion tube. Connect the connector 30. In this case, the lock cylinder 30a of the connector 30 is connected to the connection portion 26 of the hub body 20 by screwing. The extension portion 24 (specifically, the lower surface 24a of the extension portion 24) provided on the catheter hub 14 is in contact with the skin S. In this state, the lock cylinder 30a of the connector 30 is inserted between the extension portion 24 and the hub main body 20.

Next, the user fixes the catheter hub 14 to the skin S with medical tape or the like. Then, the infusion solution (drug solution) is administered from the infusion tube to the patient.

In this case, the catheter assembly 10 according to the present embodiment has the following effects.

According to the catheter assembly 10, when the catheter hub 14 and the connector 30 are connected, the connector 30 is inserted between the connecting portion 26 and the extending portion 24, so that the tip edge 30b of the connector 30 touches the skin S. There is no direct contact. Therefore, irritation to the skin S by the tip edge 30b of the connector 30 can be prevented or suppressed, and discomfort to the patient can be suppressed. Further, when the catheter hub 14 and the connector 30 are connected, the tip edge 30b of the connector 30 comes into contact with the extending portion 24, so that the screwing of the connector 30 is difficult to loosen.

The extending portion 24 extends in a direction inclined with respect to the axis a of the hub main body 20. With this configuration, the tip side of the catheter hub 14 can be compactly configured, and a gap G into which the connector 30 can be inserted can be formed between the extension portion 24 and the hub body 20.

Since the lower surface 24a of the extending portion 24 is made of a soft material, irritation due to contact of the lower surface 24a of the extending portion 24 with the skin S can be reduced.

The extending portion 24 can be elastically deformed in the direction of approaching and separating from the hub main body 20. With this configuration, since the extending portion 24 can be deformed according to the size of the connector 30, it is possible to correspond to the connector 30 of various sizes.

The extending portion 24 extends from a position closer to the tip side than the central portion in the length direction of the hub main body 20. With this configuration, the extending portion 24 can be made relatively long, and an appropriate amount of elastic deformability can be secured.

Since at least the portion of the extending portion 24 that can come into contact with the outer peripheral portion of the connector 30 is made of a hard material, the load (load transmission) from the connector 30 to the skin S can be effectively suppressed. ..

The extending portion 24 is a plate-shaped body. With this configuration, since the extending portion 24 has a certain thickness, the load on the skin S can be further reduced.

Since the lower surface 24a of the extending portion 24 is flat, the contact pressure between the skin S and the extending portion 24 can be reduced, and the discomfort to the patient due to the contact can be further suppressed.

Since the lower surface 24b of the base end portion of the extension portion 24 is curved so as to approach the axis a of the hub body 20 toward the base end direction, the load on the skin S at the base end portion of the extension portion 24 is reduced. can do.

As shown in FIG. 3, since the width W2 of the extending portion 24 is larger than the width W1 of the hub body 20, the stability of the catheter hub 14 when fixed to the skin S can be improved.

The extending portion 24 has a shape in which the width increases toward the proximal end direction. With this configuration, the width of the distal end side of the extending portion 24 is relatively narrow, which can contribute to the compactness of the catheter hub 14. On the other hand, since the base end side of the extension portion 24 is relatively wide, the stability of the catheter hub 14 at the time of fixing to the skin S can be improved.

In the catheter hub 14A according to another aspect shown in FIG. 5, a concave curved portion 34 is provided on the upper surface 24u of the extending portion 24A. The concave curved portion 34 faces the connecting cylinder portion 26a of the hub main body 20, and extends along the longitudinal direction of the extending portion 24A with a certain length. As shown in FIG. 6, the concave curved portion 34 is an arc-shaped curved surface. According to the catheter hub 14A configured in this way, stress concentration by the connector 30 can be suppressed, and the load from the connector 30 to the skin S can be suppressed more effectively.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

Claims (12)

With a catheter
An internal needle that is removable and inserted into the catheter,
A catheter hub provided at the base end of the catheter and
Catheter assembly with
The catheter hub has a hub body provided with a connection portion that can be connected to a connector of a liquid feeding line, and an extension portion extending from the hub body.
The extension portion is a portion that comes into contact with the skin while the catheter hub is fixed to the skin.
A catheter assembly in which the connector is inserted between the connecting portion and the extending portion in a state where the connector is connected to the connecting portion of the hub body. In the catheter assembly according to claim 1,
The extension portion extends in a direction inclined with respect to the axis of the hub body, and is a catheter assembly. In the catheter assembly according to claim 1 or 2.
A catheter assembly in which the extension portion is elastically deformable in the direction of approaching and separating from the hub body. In the catheter assembly according to claim 3,
The extension portion is a catheter assembly that extends from a position on the distal end side of the central portion in the length direction of the hub body. In the catheter assembly according to any one of claims 1 to 4.
A catheter assembly in which at least a portion of the extending portion that can come into contact with the outer peripheral portion of the connector is made of a hard material. In the catheter assembly according to any one of claims 1 to 5.
A catheter assembly in which a concave curved portion is provided on the upper surface of the extending portion. In the catheter assembly according to any one of claims 1 to 6.
The extension portion is a catheter assembly which is a plate-like body. In the catheter assembly according to any one of claims 1 to 7.
A catheter assembly in which the lower surface of the extension is flat. In the catheter assembly according to any one of claims 1 to 8.
A catheter assembly in which the width of the extension is greater than the width of the hub body. In the catheter assembly according to any one of claims 1 to 9.
The extension portion is a catheter assembly having a shape in which the width increases toward the proximal end. In the catheter assembly according to any one of claims 1 to 10.
A catheter assembly in which the lower surface of the proximal end of the extending portion is curved toward the proximal end toward the axis of the hub body. A catheter hub provided at the base of the catheter
A hub body with a connection that can be connected to the liquid supply line connector,
It is provided with an extension portion extending from the hub body.
The extension portion is a portion that comes into contact with the skin while the catheter hub is fixed to the skin.
A catheter hub in which the connector is inserted between the connecting portion and the extending portion in a state where the connector is connected to the connecting portion of the hub body.

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