JPH07250902A - Prick guide for medical treatment - Google Patents

Abstract

PURPOSE:To make it possible to prick a needle always at a certain one point by providing a prick guide for medical treatment with an introducing part which has a conduit for a needle for introducing a needle tip to be pricked to one point and introduces this needle tip to one end of this conduit and a pricking part which comes into contact with a target to be pricked at the other end. CONSTITUTION:This prick guide 1 is formed by using hard materials which are resistant to cutting, flawing, etc., by the tip of the needle to be pricked and have good bioaffinity for subcutaneous implantation; for example, glassical carbon, polycarbonate, etc. The prick guide has the conduit 3 which is the same as the outside diameter of the needle to be pricked or is slightly larger than the same, the introducing part 2 for introducing the needle tip to the conduit 3 and the pricking part 4 at the end which is not the introducing part 2. The shape of the prick guide 1 for medical treatment includes cubes which are larger in the surface area of the surface on the side of the pricking part 4 in contact with the target to be pricked than the surface area of the surface or the vertex where the introducing part 2 for introducing the needle tip exists, for example, tetrahedrons or cubes, circular cones, ellipsoidal circular cones, etc., which are triangular and trapezoidal in sectional shape viewed from the sides, in order to assure the safety after the implantation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical device for puncturing a living body and performing a medical procedure corresponding thereto. Furthermore, the present invention can be used as a blood port in blood access for dialysis, or as a dialysate exchange port in peritoneal dialysis.

[0002]

2. Description of the Related Art When a living body is punctured, the wound caused by the puncture is closed by its self-repairing force, and the original state is immediately restored. However, if a puncture is made frequently and in a narrow area, it may not be possible to repair the living body in time, and eventually its function may deteriorate. Furthermore, when puncturing an artificial implant, since it has no self-repairing ability, deterioration of the material due to puncturing occurs remarkably, resulting in many problems in strength and other functions.

As a conventional technique, taking dialysis blood access as an example, a method of puncturing a puncture site widely and uniformly, or a method in which a conduit or the like is previously passed through a part of the blood access without puncturing, Blood collection / returning of blood via the
Methods such as returning blood have been used.

[0004]

However, there is a limit to how wide the puncture site can be, and the recovery of the wound due to the puncture will not be completed in time, resulting in many problems. Further, the method using a conduit, a port and the like can prevent the burden on the living body and the deterioration of the material due to the puncture, but has the drawback that the risk of infection is very high because it is in communication with the outside world. Therefore, from the viewpoint of minimizing the deterioration of the object due to puncture,
It is always necessary to puncture only one point.

[0005]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors, the present invention has a structure in which a needle always sticks to only one point,
In addition, the present invention was found to be a subcutaneous implantable type in order to reduce the risk of infection so that the puncture site can be confirmed from outside the body.

Therefore, the above object is solved by the present invention described below. (1) A conduit for a needle for guiding the needle tip of a needle to be punctured to one point is provided, and an introduction portion for guiding the needle tip is provided at one end of the conduit, and a puncture portion in contact with a target to be punctured is provided at the other end. A medical puncture guide characterized in that

(2) An artificial implant in which at least a part of the medical puncture guide of the above (1) is provided.

Since the medical puncture guide of the present invention always punctures only one point, it has the same outer diameter as the needle to be punctured,
Alternatively, a slightly larger conduit is further provided, and an introducing portion for guiding the needle tip to the conduit is provided. That is, it has a structure in which the puncture needle inserted from the introduction portion passes through the conduit and is always guided to one puncture site.

The medical puncture guide of the present invention is provided in a living blood vessel or an artificial blood vessel to provide blood access for dialysis, blood injection of a drug or blood collection, and inflow of peritoneal dialysate when performing peritoneal dialysis in the peritoneum. It can be effectively used at the time of inserting an introducer used for discharging or inserting an angiographic catheter.

The medical puncture guide of the present invention may be integrally formed of the same material, or may be used in combination by using the conduit and the introducing portion as separate bodies made of different materials.

The material of the medical puncture guide of the present invention is not particularly limited, but a hard material that is not cut or scratched by the tip of the punctured needle is preferable, and it is subcutaneously Since it is embedded, it is preferable that it has good biocompatibility. Specifically, there may be mentioned, for example, graphical carbon and polycarbonate.

The outer surface of the medical puncture guide of the present invention preferably has a smooth shape so as not to cause an inflammatory reaction or dead space in the living body. Alternatively, a material having flexibility and lubricity such as an elastomer may be coated.

The specific shape of the medical puncture guide of the present invention is not particularly limited, but in order to ensure stability after implantation, the surface area of the surface in contact with the puncture target (puncture portion side) is the needle tip. A cube larger than the surface or the surface area of the apex where the introduction portion that guides is present is desired, and examples thereof include a tetrahedron, a cube having a triangular / trapezoidal cross-sectional shape when viewed from the side, a cone, an elliptical cone, and the like. Specifically, the thing of the shape of the cross-sectional view shown in FIG. 1 and FIG. 2 is mentioned.

The conduit may be provided vertically or obliquely in the above-mentioned cube, depending on the application and need, toward the surface in contact with the target to be punctured from the introduction part for guiding the needle tip. In addition,
A plurality of conduits may be provided if necessary.

In the conduit, the end (puncture part) which is not on the introduction side may be open, but when it is used for a blood vessel or the like, backflow of blood is considered, so it is closed if it can be pierced by a puncture needle. May be. Further, a hemostasis valve made of an elastic material such as silicon rubber may be provided in the puncture portion that is opened to prevent backflow of blood.

Considering that the size of the medical puncture guide of the present invention is to be implanted in a living body, the size of the medical puncture guide should be as small as possible within a range in which a conduit and an introducing portion having a size into which a needle to be punctured can be inserted are provided. It is preferably small.

In addition, there is a possibility that the puncture may be difficult to puncture due to scarring in the tissue around the puncture site by repeating the puncture before the healing of the tissue invasion due to the puncture is completed. A plurality of medical puncture guides of the present invention may be embedded.

Since the skin tension may be increased depending on the approach angle of the needle tip at the time of puncturing, it is preferable to set the angle of the conduit as necessary to define the puncturing direction.

The medical puncture guide according to the present invention exposes a target object such as a living blood vessel or an artificial blood vessel that has already been implanted by incising the skin and applies the target object, or an artificial blood vessel such as an artificial blood vessel. An artificial implant with a medical puncture guide that has been previously given to the implant may be implanted at the target location.

The medical puncture guide of the present invention can be applied to a target object by suturing with a thread, adhering with an adhesive, a synthetic resin, or the like when it is applied to a living object such as a living blood vessel. When it is applied to an artificial implant such as a blood vessel, a method such as suturing with a thread, bonding with a heat-melting (welding) medical adhesive, and integrally molding at the time of production can be mentioned.

As a method for confirming the position of the medical puncture guide of the present invention embedded in a living body, palpation, a method of previously coloring the medical puncture guide with a color that can be seen through the skin, light Transmission by infrared rays, X-rays, etc., a method using magnetic force, etc. are possible. In addition, these methods may be combined in order to enhance the safety of puncture.

The method of using the medical puncture guide of the present invention is as follows:
First, the medical puncture guide is confirmed from outside the body, and a puncture needle is punctured aiming at the introduction part. The puncture needle reaches the target site while being guided by the conduit. In addition, it is possible to puncture a certain point of the target site at all times.

When used as a blood port for blood access for dialysis, for example, puncture is performed through the medical puncture guide of the present invention, and blood collection and blood return are possible. Further, as the peritoneal dialysis port, the peritoneal dialysate can be exchanged in the same manner as the blood port.

[0024]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

(Example 1) A puncture guide 1 having a conduit 3 into which a dialysis needle of 17G can be inserted, a lead-in portion 2 and a puncture portion 4 is prepared by using polycarbonate as a material and a cross sectional view thereof is shown in FIG. did.

An in vitro puncture test was performed to confirm the introduction part. The entire puncture guide 1 is covered with colored silicone rubber (thickness is less than 1 mm), and 20 is actually applied with a 17G needle.
One puncture was performed. As a result, it was possible to insert the needle up to the puncture portion 4 20 times. Further, the introduction portion 2 could be easily confirmed by palpation.

(Example 2) Silicone rubber having a thickness of 1 mm was attached below the puncture portion 4 of the puncture guide 1 used in Example 1 to actually perform puncture with a 17G needle to confirm the degree of puncture concentration. . After the puncture was performed 50 times, the silicone rubber was peeled off. As a result, there was only one trace of the needle on the silicone rubber at one target site, and no abnormality was found at the surrounding site.

(Example 3) Using polycarbonate, a composite medical puncture guide 30 with an artificial blood vessel 36 (knitted tubular body made of polyester) whose cross-sectional view is shown in Fig. 3 was prepared. The medical puncture guide portion 31 and the artificial blood vessel 36 were adhered by a medical adhesive (Aron Alpha (registered trademark)). Silicone rubber (thickness 1mm
(Weak) and attach the inner surface of the artificial blood vessel 36 to the fibrin gel 3
Coated with 7.

Between the neck movements and veins of a rabbit (2.7 kg, male) A
Connect to a part of V shunt circuit to circulate blood,
A puncture was made with G. As a result, 60 punctures were performed within 3 hours immediately after the start of circulation, but the punctures were easy,
The hemostatic valve 35 after the end of circulation had only one hole due to puncture. As for hemostasis, hemostasis was spontaneously started after the needle was removed at all 60 times, and was completely stopped after about 2 seconds.

[0030]

As described above in detail, the medical puncture guide of the present invention can repeatedly puncture only one point of the puncturing needle, and minimizes the deterioration of the living body and the artificial implant. Can be

It is also possible to combine an artificial implant (a puncture target) and a device for imparting functionality such as a mechanical valve using a leaf spring (elastic plate) or the like, and those functionalities. The effect described above can be maintained without impairing durability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of a medical puncture guide of the present invention.

FIG. 2 is a cross-sectional view showing an example of an embodiment of the medical puncture guide of the present invention.

FIG. 3 is a cross-sectional view showing an example of an embodiment in which the medical puncture guide of the present invention is combined with an artificial blood vessel.

[Explanation of symbols]

1,21 ... Medical puncture guide, 2,22 ... Introduction part, 3,
23 ... Conduit, 4, 24 ... Puncture part, 30 ... Composite medical puncture guide with artificial blood vessel, 31 ... Medical puncture guide part, 32 ... Introduction part, 33 ...・ Conduit, 34 ... puncture part, 3
5 ... Hemostasis valve, 36 ... Artificial blood vessel, 37 ... Fibrin gel

Claims (1)

[Claims] 1. A lead conduit for guiding a needle tip of a needle to be punctured to one point, and an introducing portion for guiding the needle tip to one end of the conduit.
A puncture guide for medical use, which is provided with a puncture part which is in contact with a target to be punctured at the other end.