JP2662521B2 - Operational perforated catheter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series of operative perforated catheters used to insert a catheter into a target site in a living tissue.

[0002]

2. Description of the Related Art Conventionally, various structures and means have been devised for inserting a catheter into a target site in order to insert a medical device such as a catheter into a living tissue and to perform a procedure such as sampling or injection of a drug solution. Have been.

[0003] As a means for inserting a catheter into a target site of a living tissue, a flexible introduction needle made of synthetic resin or the like is used. The introducer needle inserted from the outside of the living tissue by being punctured is flexible and can reach a bent blood vessel, an esophagus, or the like or a deep part of the tissue. In addition, the introduction needle is a hollow tube, and the catheter can be passed through the tube of the introduction needle. After inserting the introduction needle into a living tissue prior to insertion of the catheter, the catheter is inserted into the tube of the introduction needle so as to be guided through the catheter, and the catheter can be inserted into a target site. Furthermore, from the viewpoint of convenience of operation and hygiene, various medical treatments are performed by separating (peeling off) the introduction needle, removing from the catheter and taking it out of the body. However, in such a method, it is difficult to insert in a complicated direction, considerable skill is required for the operator, there is a risk of damaging living tissue, and since there are many opportunities to touch the catheter by hand during operation. However, there is a problem that the risk of contamination by various bacteria increases.

[0004] In addition, as a means for changing the insertion direction of the catheter, a guide wire for changing the insertion direction is attached to the tip of the catheter in parallel with the catheter, and the base of the guide wire is pulled. There is a mechanism in which the tip of the catheter is bent toward the drawn side to determine the direction of travel of the distal end portion of the catheter. However, by providing such a complicated structure inside the catheter, the diameter of the catheter becomes large, and the use is limited to a living body part such as an endoscope that can secure a certain space such as a body cavity. However, there is a problem that operability is lacking.

[0005]

DISCLOSURE OF THE INVENTION In view of the above-mentioned problems of the prior art, a catheter to be inserted into a living tissue includes:
An object to be solved is to provide a catheter that can be manufactured in a fine structure, enhance operability, and can be used in a sanitary manner.

[0006]

The operable perforated catheter comprises a puncture needle used to be inserted into a living tissue, wherein the puncture needle is used for collecting a sample or for sending a drug solution. A pair of guide needles for perforation arranged so as to sandwich the collection liquid sending pipe, and the pair of guide needles for perforation are alternately moved by pistons to perform sliding contact and perforation movements, thereby obtaining a living tissue. Piercing is promoted.

[0007] Each of the perforating guide needles has a projection for cutting or preventing backward movement at the outer peripheral portion of the distal end thereof.
Propulsion force is reliably transmitted in the sliding contact piercing movement in which the pair of piercing guide needles alternately moves in a piston.

[0008] By providing a mechanism for keeping the collecting liquid sending pipe and each of the perforating guide needles in close contact with each other and maintaining the guide sliding contact engagement, the sliding of the collecting liquid sending pipe and the perforating guide needle during the sliding contact and perforating movement. To prevent

[0009]

The operation type perforated catheter comprises a puncture needle which is used by inserting it into a living tissue, wherein the puncture needle is used for collecting a sample or for sending a drug solution. A pair of guide needles for perforation arranged so as to sandwich the collection liquid sending pipe, and the pair of guide needles for perforation are alternately moved by pistons to perform sliding contact and perforation movements, thereby obtaining a living tissue. However, it is possible to manufacture the collection liquid sending tube and the guide needle for drilling finely, and to minimize the damage to the biological tissue in response to the complicated structure of the biological tissue, and to pierce the catheter to the deep part. Can be propelled.
Furthermore, it is possible to reduce the production cost in terms of the material and the production, and thus a disposable use method is also conceivable, and sanitary work can be performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The effects and functions of the present invention will be described with reference to the drawings of the embodiments. The present invention is not limited to these examples.

(Embodiment 1) An operation-type perforated catheter used in the present invention is a set of a single liquid collection tube (1) and a pair of perforation guide needles (2, 2 '). It consists of a puncture needle (3) (FIG. 1).

Hereinafter, each part will be described in detail.

The sampling liquid sending pipe (1) used in the present invention is a hollow tube, and the sampling liquid sending passage (7) is connected from the distal end to the pump connecting portion at the base, and is used for sampling or chemical solution sending. Serve for purpose (Figure 1).

For example, the cross-sectional structure of the collection liquid sending pipe (1) has a circular or elliptical shape, and has a single collection liquid sending path (7) at the center thereof (FIG. 2A). It is possible to have two sampling liquid passages (7) (FIG. 2-b) in order to carry out the liquids simultaneously. In addition, sampling liquid transfer pipe (1)
Is smoothed and brought into close contact with a pair of perforating guide needles (2, 2 ') (FIGS. 2-a and 2-b).

[0015] A pair of perforating guide needles (2, 2) used in the present invention.
2 ') is arranged in parallel with one sampling liquid sending pipe (1) so as to be sandwiched from both sides, and is used for introducing the sampling liquid sending pipe (1) to a target site in a living body. (FIG. 1).

For example, a pair of perforating guide needles (2, 2 ')
Has a flat whip-shaped cross section (FIG. 1). The cross-sectional shape of the piercing guide needle (2, 2 ′) is such that the inner periphery thereof is curved inward so as to be in close contact with the outer periphery of the central sampling liquid sending pipe (1) arranged to be sandwiched between the piercing guide needles. It is the shape which was made (FIG. 2-a). With such a shape, it is possible for both to come into close contact without falling off. The distal end of the puncture guide needle (2, 2 ') projects sharply to pierce the living tissue, and the distal end is curved inward toward the central sampling liquid feed pipe (1) (FIG. 1, FIG. 4).

For example, a pair of perforating guide needles (2, 2 ')
Several rows of projections (4) are engraved on the outer periphery of the tip (FIG. 1) to form a saw-tooth shape. The projection (4) has a function to cut through the living tissue when performing a sliding contact piercing motion to promote piercing of the living tissue to be described later, or a function of returning the sliding contact piercing motion to reverse.

Next, a method for promoting perforation of a living tissue will be described.

The present invention is composed of one sampling liquid sending pipe (1) and a pair of perforating guide needles (2, 2 ').
A method of piercing and promoting a set of puncture needles (3) in living tissue is as follows.
A pair of perforating guide needles (2, 2 ') are alternately moved by pistons to perform sliding perforations to promote perforation.

First, in one set of the puncture needles (3), one collection liquid sending pipe (1) and one pair of perforating guide needles (2, 2 ')
Are aligned, and the tip of the puncture needle (3) is pierced from outside the living body and inserted into the living tissue (FIG. 3).
a).

When the distal end of the puncture needle (3) is inserted into the living tissue, one (2) of the pair of puncture guide needles (2, 2 ') is
The other guide needle (2 ') for perforation and the collection liquid sending pipe (1)
Stick out ahead of the other two. At this time, the projection (4) on the outer periphery of the leading end of the leading guide needle (2) for cutting forward acts to sever the tissue, while the projection (4 ') of the other guide needle (2') for perforation inserts a needle. (3) acts as a return to prevent backward movement. In addition, since the tip of the drilling guide needle (2, 2 ') is curved inward toward the central sampling liquid feed pipe (1), the drilling guide needle (2) protruding ahead is slightly inward. (B) while moving forward.

Next, the leading guide needle for perforation (2)
The position of the tip of the other perforating guide needle (2 ') and the tip of the collection liquid sending tube (1) are returned to the same position.
That is, the entire position of the puncture needle (3) at this time is along the curvature of the distal end portion of the puncture guide needle (2 ') by the length of the advance of the puncture guide needle (2'). This means that the vehicle has advanced while curving slightly inward (FIG. 3-c).

[0023] The single-stage piston movement makes a one-step forward movement. Further, in the next stage, the piercing guide needle (2 ') on the opposite side to the preceding stage is advanced, and the piston movement is performed in the same manner as described above, thereby performing another forward movement (FIG.
d, FIG. 3-e). By continuously performing the sliding contact and piercing motion as described above, piercing can be promoted in the living tissue.

Further, at the time of the above-mentioned sliding contact piercing movement, only one of the piston movements of the pair of piercing guide needles (2, 2 ') is largely moved, or a large amount of movement is caused to perform sliding contact movement. As a result, the curve toward the inside of the guide needle (2 or 2 ′) for perforation that protruded in advance became large,
Drilling can be promoted by changing the traveling direction. In addition, with the puncture needle (3) inserted in the living body, a pair of guide needles (2, 2 ') for perforation centering on one collection liquid sending pipe (1).
By rotating the positional relationship in the direction perpendicular to the puncture needle (3), the puncture needle (3) can be pierced and propelled three-dimensionally (FIG. 4).

Sampling liquid sending pipe (1) performing the above-mentioned sliding contact piercing movement
The material used for the pair of perforating guide needles (2, 2 ′) may be a flexible material, which allows it to advance appropriately in accordance with the tissue structure when inserted into a living tissue. For example, polyethylene resin is suitable.

(Embodiment 2) However, it is conceivable that the sliding contact and perforation movement may hit a tissue or a tissue structure which is an obstacle to the perforation promotion in the living tissue. And 3 of a pair of perforating guide needles (2, 2 ')
The close contact between the persons may be hindered. In order to solve such a drawback and maintain the guide sliding contact engagement during the sliding contact piercing movement, the relationship between the sampling liquid feed pipe (1) and the pair of piercing guide needles (2, 2 ′) is considered. , Fitting structure (5,
6) to assist (Fig. 1, Fig. 2-c).

That is, the fitting structure (5, 6)
Is provided with a male projection (5) on the outer periphery of the sampling liquid sending pipe (1), in which the inner circumference of the perforating guide needle (2, 2 ') is in close contact, in parallel with the sampling liquid sending pipe (1). On the other hand, a female groove (6) is provided on the inner periphery of the guide needle (2, 2 ') for perforation where the outer periphery of the collection liquid sending pipe (1) is in close contact with the guide needle (2, 2') for perforation. Is provided (FIGS. 1 and 2C). Further, the outer diameter of the male projection (5) and the inner diameter of the female groove (6) are made substantially the same. The sampling liquid sending pipe (1) and the pair of perforating guide needles (2, 2 ') are prevented from falling off, and the guide sliding contact engagement relationship is maintained. Note that the relationship between the male projection and the female groove is reversed by providing a female groove (6) on the outer periphery of the collection liquid sending pipe (1) and the inner circumference of the perforating guide needle (2, 2 '). May be provided with a male projection (5).

However, when it is necessary to use a fine catheter in the brain or the like, such a fitting structure is not always necessary, and the outer peripheral surface of the collection and delivery pipe (1) and the guide for perforation are provided. The inner peripheral surfaces of the needles (2, 2 ′) are made smooth to be in close contact with each other, and can prevent separation of the puncture needle (3) (FIG. 2-a).

(Embodiment 3) As described above, in order to pierce the living tissue with the operable perforating catheter of the present invention, it is necessary to first pierce the living tissue with a set of puncturing needles (3). At this time, for example, a needle holder (9) for positioning and holding a thin and flexible needle (3) on the body surface.
(FIG. 5).

(Embodiment 4) A catheter housing (10) having a mechanism for adjusting the length of a puncture needle to be fed can be provided (FIG. 5).

(Embodiment 5) In addition, in order to operate the operable puncture catheter of the present invention on a living tissue and to promote puncture, it is necessary to provide a mechanism for moving a puncture guide needle into a piston. It is conceivable to connect, for example, a drive (11) and a control device for operation to the vessel (9) (FIG. 5).

(Embodiment 6) Further, after inserting the operable perforated catheter of the present invention into a living tissue, it is necessary to provide a pump unit (12) for sampling and feeding a drug solution (FIG. 5). ).

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an operation-type perforated catheter of the present invention.

FIG. 2 is a cross-sectional view of the operative perforated catheter of the present invention.

FIG. 3 is an explanatory view of a method for promoting perforation of an operation type perforation catheter of the present invention.

FIG. 4 is a schematic view of a method for promoting perforation of an operation type perforation catheter according to the present invention.

FIG. 5 is a puncture holder of the operative perforated catheter of the present invention;
It is a schematic diagram of a catheter storage part, a drive part, and a pump part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sampling liquid feeding pipe 2 Drilling guide needle 3 Pricking needle 4 Projection 5 Fitting structure (male type projection) 6 Fitting structure (female type groove) 7 Sampling liquid feeding path 8 Living tissue 9 Puncture holder 10 Catheter housing part 11 Drive unit 12 Pump unit

Claims (3)

(57) [Claims] 1. An operation-type puncture catheter comprising a puncture needle used to be inserted into a living tissue, wherein the puncture needle is used for collecting a sample or for sending a drug solution. And a pair of guide needles for perforation arranged so as to sandwich it, and the pair of guide needles for perforation are alternately moved by a piston to perform sliding contact and perforation motions to promote perforation in living tissue. An operation type perforation catheter characterized by the above-mentioned. 2. The operation-type puncture catheter according to claim 1, wherein each of the puncture guide needles has a projection for cutting or preventing backward movement at an outer peripheral portion of a distal end thereof. 3. An operation-type perforated catheter according to claim 1, further comprising a mechanism for keeping said sampling liquid sending tube and said perforating guide needles in close contact with each other to maintain a guide sliding contact engagement relationship. .