JPH0230695B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve-equipped catheter suitable for use in vascular catheters, urethral catheters, and other general catheters.

Prior Art In general, a catheter passage includes a guide wire for guiding the catheter into each organ in the body, a syringe for injecting drugs etc. into each organ through the catheter, and body fluids in each organ through the catheter. It is possible to insert a collector, etc. that allows the removal of

For example, a vascular catheter can be introduced into a blood vessel by the Seldinger method using a guide wire. In other words, in the Seldinger method, a hollow needle with an inner needle inserted through the skin is introduced into a blood vessel, a guide wire is inserted into the hollow needle from which the inner needle is removed, and the hollow needle is then removed. Thereafter, a catheter with an open tip is fitted onto the guide wire, and the catheter can be introduced into the blood vessel while being guided along the guide wire. In addition, when performing angiography using a catheter introduced into a blood vessel in this way, after the guide wire is removed from the catheter, a vascular contrast agent is injected with a syringe connected to the proximal opening of the catheter. The angiographic agent can be injected and delivered to a desired location within the blood vessel.

However, when such a vascular catheter as described above is introduced into a blood vessel under the guidance of a guide wire, blood loss due to blood leakage from the gap between the proximal opening of the catheter and the guide wire cannot be avoided. In addition, in order to introduce a catheter into a blood vessel with complicated bends, guide wires with various curved tips are used interchangeably, or when removing the guide wire from the catheter when injecting a vascular contrast agent into the catheter. There is a risk that a larger amount of blood will flow out from the proximal opening of the catheter. Note that even when using a catheter other than a vascular catheter, there is a risk of body fluid flowing out from the proximal opening, which is not appropriate.

OBJECTS OF THE INVENTION An object of the present invention is to provide a catheter with a valve body that can reliably prevent body fluid from flowing out from the proximal opening of a catheter passage through which a guide wire can be inserted.

Composition of the Invention In order to achieve the above-mentioned object, the present invention allows a guidewire to be inserted into the proximal opening of a catheter passageway in a liquid-tight state, and is equipped with a valve body that closes when the guidewire is not inserted. A catheter with a valve body, wherein the valve body has a first notch that opens only on one end surface thereof, and a second notch that opens only on the other end surface, and the first notch and the second notch are open only on the other end surface. It is constructed by intersecting the two notches inside.

Further, in the catheter with a valve body according to the present invention, the valve body is made of a soft and elastic material.

Further, in the catheter with a valve body according to the present invention, the first incision of the valve body is composed of a plurality of mutually intersecting incisions, the second incision is composed of a plurality of mutually intersecting incisions, and The first cut and the second cut intersect at a single position inside the valve body.

Further, in the catheter with a valve body according to the present invention, the first incision of the valve body is made up of a plurality of incisions that do not intersect with each other, and the second incision is made up of a plurality of incisions that do not intersect with each other. 1st
The notch intersects with the second notch at a plurality of positions inside the valve body.

Moreover, in the catheter with a valve body according to the present invention, the end surface of the valve body is formed into a convex shape.

Further, in the catheter with a valve body according to the present invention, the valve body is removably attached to the proximal end portion of the catheter.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a cross-sectional view showing a catheter with a valve body according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a main part thereof. In this embodiment, the valve body 10 is held between a plug 11 and a cap 12 fitted onto one end of the plug 11. The plug 11 includes a tapered fitting outer surface 13 that is removably attached to a tapered opening inner surface 22 of a hub 21 constituting the proximal end of the vascular catheter 20, and has a passage 14 that communicates with a passage 23 of the vascular catheter 20. We are prepared. Also, cap 12
is equipped with a passage 15. Note that 30 indicates a guide wire.

The valve body 10 is made of synthetic rubber such as silicone rubber, urethane rubber, or fluorine rubber, or natural rubber or other flexible elastic material.

Here, as shown in FIGS. 3A to 3C, the valve body 10 is carved with a first notch 17 that opens only on one end surface and a second notch 18 that opens only on the other end surface. , the first notch 17 and the second notch 18 intersect inside the valve body 10. That is, the first notch 17 and the second notch 17
The notches 18 form an intersection 19 with a distance L, so that the guide wire 30 crosses the first notch 17 and the second notch 19 under elastic deformation of the valve body 10.
It is possible to pass through the notches 18 and their intersections 19.

FIG. 4 shows the first incision 17 and the second incision when inserting the guide wire 30 into the valve body 10.
It is an explanatory diagram showing the deformation direction of the notch 18,
FIG. 5 is an explanatory diagram showing the opening shapes of the first cut 17 and the second cut 18 when the guide wire 30 is inserted into the valve body 10. When the valve body 10 is sliced into three characteristic parts in its axial direction, that is, a part where only the first notch 17 exists, a part where the intersection 19 exists, and a part where only the second notch 18 exists. There are three parts 10A to 10C as shown in Fig. 4. If the valve body 10 is simply made up of three separate parts as shown in 10A to 10C above, the direction of deformation of each cut 17 and 18 when inserting the guide wire 30 is The state shown by arrow 2 in FIG. 4 is reached, and the opening shape of each cut 17, 18 after insertion becomes the state shown by 1 in FIG. 5. However, the valve body 10
Since they are originally integral, each slice portion is influenced by other adjacent portions, and the deformation direction of each cut 17, 18 when attempting to insert the guide wire 30 is shown in 3 in Fig. 4. It changes continuously in the axial direction inside the valve body 10 as shown in FIG.
The shape of the openings 7 and 18 is as shown by 2 in FIG. In other words, the circumference of the guide wire 30 inserted into the valve body 10 is formed in each of the notches 17 and 18, regardless of whether the outer diameter is relatively small or large. Therefore, it is pressed continuously in the axial direction without any gaps. Here, valve body 1
0 is formed of a flexible elastic material as described above, each of the notches 17 and 18 is in close surface contact with the outer circumference of the guide wire 30, and the guide wire 30 and the valve body 10 are securely connected. Forms a liquid-tight state. Note that the distance L between the intersection 19 of the first notch 17 and the second notch 18 is
It is determined according to the maximum outer diameter of a rod-shaped object such as the guide wire 30 inserted into the guide wire 30 or the like.

Specific Effects of the Invention The effects of the valve-equipped catheter according to the above embodiment will be described above. First, before using the valve body 10 and the vascular catheter 20, a hollow needle with an inner needle inserted therein is introduced into the blood vessel through the skin, and then a guide wire 3 is inserted into the hollow needle from which the inner needle is removed.
0 is inserted, and then the hollow needle is removed, leaving the guide wire 30. Next, with the plug 11 equipped with the valve body 10 fitted into the hub 21 of the vascular catheter 20, the passage 23 of the vascular catheter 20 is inserted.
A guide wire 30 is fitted inside the catheter, and the vascular catheter 20 is introduced into the blood vessel while being guided by the guide wire 30. As described above, when the vascular catheter 20 is introduced into the blood vessel under the guidance of the guide wire 30, although the blood in the blood vessel flows into the passage 23 of the vascular catheter 20, the vascular catheter 20
The plug 11 including the valve body 10 is fitted into the hub 21 provided at the base end of the valve body 10, and the first notch 17 and the second notch 18 of the valve body 10 are in a closed state. Blood does not flow out from the proximal opening of the vascular catheter 20.
In addition, since the notches 17 and 18 of the valve body 10 do not open to the other end face, the valve body 10 has high pressure resistance against the pressure of blood acting on the end face of the valve body 10.
Maintains a stable closed state that is not deformed by blood pressure.

As the vascular catheter 20 is introduced into the blood vessel, the valve body 10 attached to the proximal opening of the vascular catheter 20 passes through the outer end of the guide wire 30, as shown in FIG. However, the notches 17 and 18 of the valve body 10 are in close contact with the periphery of the guide wire 30 without any gaps, maintaining a fluid-tight state and preventing blood leakage.

In this manner, when the distal end of the vascular catheter 20 reaches a predetermined position within the blood vessel, the guide wire 30 is removed from the passageway 23 of the vascular catheter 20. Note that when the guide wire 30 is removed from the vascular catheter 20, the guide wire 30 is pulled out from each of the incisions 17 and 18 of the valve body 10, and at the same time, each of the incisions 17 and 18 is completely closed, and blood is removed. prevent the leakage of Here, since each of the notches 17 and 18 of the valve body 10 is opened only on one end face of the valve body 10, the restoring force to the closed state when the guide wire 30 is removed is strong, and the other There is no reverse opening operation on the end face side. Further, while the guide wire 30 is removed from the passage 23 of the vascular catheter 20 and only the vascular catheter 20 is left in the blood vessel,
The valve body 10 completely closes each of the incisions 17 and 18 to prevent blood from flowing out.

Next, the passage 2 of the vascular catheter 20 is inserted into the blood vessel.
In order to inject the vascular contrast medium through the vascular catheter 3, an injection tip provided at the tip of the vascular contrast medium injector is passed through the valve body 10 and inserted into the passage 23 of the vascular catheter 20. Passage 2
An angiographic agent is injected into the 3. In this way, when the injection tip of the syringe penetrates the valve body 10, the notches 17 and 18 of the valve body 10 come into close contact with the injection tip without any gaps, maintaining a liquid-tight state. and prevent blood leakage. Also,
Even when the injection tip of the syringe is removed from the valve body 10, the notches 17, 18 of the valve body 10 immediately form a completely closed state to prevent blood from flowing out. In addition, each notch 17, 18 of the valve body 10 is
Regardless of whether the inserted guide wire has a relatively small outer diameter or a relatively large outer diameter,
The guide wire 30 has different outer diameters because it is in close contact with the guide wire without any gaps.
and the injection tip of the syringe in a liquid-tight manner.

When the injection of the angiographic agent is completed, the injection tip of the injector is removed from the valve body 10, the guide wire 30 is again inserted into the valve body 10 and the catheter 20, and the vascular catheter is guided by the inserted guide wire 30. 20 and guidewire 30 are removed from the vessel, completing the entire angiographic procedure.

In addition, in the above embodiment, the angiography catheter 2
Although the catheter with a valve body in which the valve body 10 is attached to the proximal opening of the valve body 10 has been described, the catheter with a valve body according to the present invention is also applicable to other catheters such as a urinary catheter.

Further, in the above embodiment, the valve body 10 is held by the plug 11, and the plug 11 is detachable from the hub 21 of the vascular catheter 20. Therefore, by removing the valve body 10 and the plug 11 from the hub 21 of the vascular catheter 20, , each incision 1 of the valve body 10 is inserted into the vascular catheter 20 from which the guide wire 30 has been removed.
It is possible to directly attach the injection part of a syringe with an outer diameter larger than the maximum opening area formed by 7, 18. However, if the valve body 10 does not need to be detachable, the valve body 10 can be attached to the vascular catheter 2.
For example, the hub 21 may be directly attached to the hub 21 in a fixed state.

FIGS. 6A and 6B show the first valve body of the present invention.
It is an explanatory view showing a modification. In this valve body 40, the first notch 41 is composed of mutually intersecting notches 41A and 41B, and the second notch 41 is composed of mutually intersecting notches 41A and 41B.
2 consists of cuts 42A and 42B that intersect with each other, and the first cut 41 and the second cut 4
2 are crossed at a single position inside the valve body 40. According to this valve body 40, it is possible to increase the deformability of each notch 41, 42 under a condition where the length of each notch 41, 42 is relatively short, and the valve body 40 has a relatively small shape. It becomes possible to insert a guide wire with a relatively large outer diameter through the guide wire.

FIGS. 7A and 7B show the second valve body of the present invention.
It is an explanatory view showing a modification. In this valve body 50, the first cut 51 consists of cuts 51A, 51B, and 51C that do not intersect with each other, and the second
The notches 52 of the notches 5 do not intersect with each other.
2A, 52B, and 52C, and the first notch 51 and the second notch 52 intersect at nine positions inside the valve body 50. Therefore, according to this valve body 50, it is possible to simultaneously insert and hold a maximum of nine guide wires.

FIGS. 8A and 8B show the third valve body of the present invention.
It is an explanatory view showing a modification. This valve body 60 has a first notch 61 and a second notch 62, and each end face 63, 64 is convex. Therefore, according to the catheter proximal opening sealing structure using this valve body 60, the blood pressure acting on the end of the valve body 60 is directed toward the center of the valve body 60, and the valve body 60 This makes it possible to more reliably create a closed state and a fluid-tight state with respect to the guide wire.

FIG. 9 is an explanatory view showing a catheter with a valve body using a fourth modified example of the valve body in the present invention. The difference between this fourth modification and the embodiment shown in FIG. 1 is that, instead of the valve body 10 in the embodiment,
The point is that a pair of first valve body 71 and second valve body 72 are used. As shown in FIG. 10, the first valve body 71 is
The second valve body 72 has a circular opening 71A in its center to prevent blood leakage when a guide wire is inserted therethrough.
A, which makes it possible to prevent blood from flowing out even when the guide wire is not inserted. Therefore,
Even in the case of a catheter with a valve body that uses a pair of valve bodies consisting of the first valve body 71 and the second valve body 72, it is possible to prevent body fluid from flowing out from the proximal opening of the catheter passage through which the guide wire can be inserted. This makes it possible to reliably prevent this.

Specific Effects of the Invention As described above, the present invention provides a valve that allows a guidewire to be inserted into the proximal opening of a catheter passageway in a fluid-tight state, and is equipped with a valve body that closes when the guidewire is not inserted. The body-attached catheter includes a first incision that opens only on one end surface of the valve body, and a second incision that opens only on the other end surface, and the first incision and the second incision It is constructed by intersecting the notches inside. Therefore, it is possible to reliably prevent body fluid from flowing out from the proximal opening of the catheter passageway when inserting or removing the guidewire. Guide wires with a wide range of different outer diameters are inserted and held in a fluid-tight manner in a catheter passageway to reliably prevent body fluid leakage, and also to reliably prevent body fluid leakage when the guide wire is suddenly withdrawn from the catheter passageway. Furthermore, by providing a single valve body, the structure can be simplified.

Further, in the catheter with a valve body according to the present invention, the valve body is made of a soft and elastic material, so that each notch of the valve body is in close surface contact with the outer circumference of the guide wire, and the valve body is made of a flexible and elastic material. It becomes possible to ensure a liquid-tight state between the guide wire and the guide wire.

Further, in the catheter with a valve body according to the present invention, the first incision of the valve body is made up of a plurality of mutually intersecting incisions, and the second incision is made of a plurality of mutually intersecting incisions. By intersecting the first cut and the second cut at a single position inside the valve body,
It is possible to increase the deformability of each notch while keeping the length of each notch relatively short, allowing a guide wire with a relatively large outer diameter to be inserted through a relatively small valve body. It becomes possible to do so.

Further, in the catheter with a valve body according to the present invention, the first incision of the valve body is made up of a plurality of incisions that do not intersect with each other, and the second incision is made up of a plurality of incisions that do not intersect with each other. By intersecting the first cut and the second cut at a plurality of positions inside the valve body, a plurality of guide wire insertion positions with respect to the valve body are formed, and a plurality of guide wires are simultaneously inserted into the valve body. It becomes possible to do so.

Further, the catheter with a valve body according to the present invention has the end face of the valve body convex, so that the blood pressure acting on the end face of the valve body is directed to the center of the valve body,
It becomes possible to more reliably create a closed state of the valve body and a fluid-tight state with respect to the guide wire.

Further, in the catheter with a valve body according to the present invention, the valve body is removably attached to the proximal end of the catheter, so that each incision of the valve body is formed at the proximal end of the catheter from which the valve body has been removed. It becomes possible to directly connect a connecting device with a size larger than the opening area.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a catheter with a valve body according to an embodiment of the present invention, FIG. 2 is a sectional view showing a main part of FIG. 1, and FIG. FIG. 3B is a plan view showing the valve body, FIG. 3C is a side view showing the valve body, and FIG. 4 is an explanatory diagram showing the deformation direction of each notch provided in the valve body. , FIG. 5 is an explanatory diagram showing the opening shape of each notch provided in the valve body, FIG. 6A is a plan view showing a first modification of the valve body in the present invention, and FIG. 6B is a diagram showing the shape of the opening of each notch provided in the valve body. A side view, FIG. 7A is a plan view showing a second modification of the valve body in the present invention, FIG. 7B is a side view of FIG. 7A, and FIG. 8A is a third modification of the valve body in the present invention. A plan view showing an example, FIG. 8B is a side view of FIG. 8A,
FIG. 9 is a sectional view showing a fourth modification of the valve body of the present invention, and FIG. 10 is a perspective view showing the valve body of FIG. 9 taken out. 10, 40, 50, 60, 71, 72... valve body, 17, 41, 51, 61... first notch, 18, 42, 52, 62... second notch, 19... intersection, 20... vascular catheter,
21... Hub, 23... Passage, 30... Guide wire, 41A, 41B, 42A, 42B, 51
A, 51B, 51C, 52A, 52B, 52C...
...notch, 63, 64... end face.

Claims (1)

[Scope of Claims] 1. A catheter with a valve body that allows a guide wire to be inserted into the proximal opening of a catheter passageway in a fluid-tight state, and is equipped with a valve body that closes when the guide wire is not inserted, The valve body includes a first notch that opens only on one end surface thereof and a second notch that opens only on the other end surface,
A catheter with a valve body configured by intersecting the first incision and the second incision inside the catheter. 2. The catheter with a valve body according to claim 1, wherein the valve body is made of a soft and elastic material. 3. The first notch consists of a plurality of notches that intersect with each other, and the second notch consists of a plurality of notches that intersect with each other, and the first notch and the second notch are arranged inside the valve body. A catheter with a valve body according to claim 1 or 2, wherein the valve body intersects at a single position. 4. The first incision consists of a plurality of incisions that do not intersect with each other, and the second incision includes:
Claim 1: Consisting of a plurality of cuts that do not intersect with each other, the first cut and the second cut intersect at a plurality of positions inside the valve body.
The catheter with a valve body according to item 1 or 2. 5. The catheter with a valve body according to any one of claims 1 to 4, wherein the end surface of the valve body is convex. 6. The catheter with a valve body according to any one of claims 1 to 5, wherein the valve body is removably attached to the proximal end of the catheter.