JPH0666642U - Trocar catheter - Google Patents

Abstract

(57) [Abstract] [Purpose] The trocar and catheter used for draining pleural and ascites fluids from the thoracic cavity and abdominal cavity, respectively, have the same trocar and catheter materials as before, but operate smoothly. To provide a safe catheter with a trocar. [Structure] A trocar that is formed so as to be inserted into the inner cavity of a catheter (see FIG. 1) and includes an outer trocar tube 7 and an inner trocar needle 6 that is used by being inserted into the inner cavity. A catheter with a trocar in which at least a part of the outer surface of 1 has a roughened surface portion 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a trocar catheter for a medical device, and more particularly to a trocar catheter used mainly for draining pleural and ascites fluids from the thoracic cavity and abdominal cavity, respectively.

[0002]

[Prior art]

 A trocar catheter is a medical device for performing abdominal puncture to eliminate ascites as a diagnosis and treatment of intraperitoneal fluid, and to perform thoracic puncture for elimination and diagnosis of pleural fluid or deaeration of pneumothorax. It is sometimes used in the medical field because it is sometimes manipulated and sometimes placed for a long time. Therefore, there is a demand for a device that can be operated safely and easily and that damage to the tissue can be minimized.

A conventional catheter with a trocar to meet these requirements is a trocar inner needle having a sharp tip and an outer trocar having an inner cavity into which the inner needle is inserted. The trocar, which consists of a tube, remains in close contact with most of the lumen of the catheter. The trocar is made of metal such as stainless steel or aluminum, and the catheter is made of soft plastic such as PVC (polyvinyl chloride) or PUR (polyurethane). In this case, the outer surface of the trocar is formed to be a mirror surface and the inner surface of the catheter lumen is also finished to be slippery in order to allow the trocar to slide smoothly over the catheter. ing.

[0004]

[Problems to be solved by the device]

 In the conventional catheter with a trocar as described above, the outer surface of the trocar is a mirror surface, and the inner surface of the catheter that is in contact with the trocar is finished to be slippery. When pulled out or passed through a catheter, they may stick to each other and a smooth sliding operation may not be possible. This was an unexpected situation, but the trocar made of metal and the catheter made of soft plastic made it easier for the trocar outer surface and the catheter inner surface to adhere to each other, and The problem was that the result catheter and trocar did not move smoothly, making it difficult to operate safely and easily.

The present invention has been made to solve the above-mentioned problems, and provides a catheter with a trocar that moves smoothly and safely even if the materials of the trocar and the catheter are the same. The purpose is.

[0006]

[Means for Solving the Problems]

 A catheter with a trocar according to the present invention is formed so that it can be inserted into the lumen of a catheter, and comprises a trocar outer tube and a trocar inner needle that is used by being inserted into this lumen. Alternatively, the trocar inner needle and the trocar outer tube are integrally molded, or the trocar inner needle is not hollow, and at least a part of the outer surface of the trocar needle is roughened.

[0007]

[Action]

 In the present invention, since the whole or part of the outer surface of the trocar is roughened, the contact area between the trocar and the catheter is smaller than that in the close contact state, so that the close contact between the two becomes poor. Even if the adhesion deteriorates, in this case, the roughness of the rough surface is set to be a rough surface with a mirror surface or a rough surface higher than that, so that the fluid does not pass through and is reasonably priced. When there is friction, the movement of the trocar during insertion / removal in the catheter lumen should be smooth.

[0008]

【Example】

 FIG. 1 is a plan view showing an embodiment of a catheter with a trocar according to the present invention. However, the trocar catheter in FIG. 1 has no functional changes in appearance from the conventional one. 2 is an enlarged cross-sectional view of the distal end portion of the trocar catheter with reference to FIG. Further, FIG. 3 is a plan view showing a portion of the trocar that has been removed from the catheter of the catheter with a trocar of FIG.

First, in FIG. 1, a trocar 1 provided to be connected to a hub 5 is inserted into an inner cavity of a catheter 3, and the trocar 1 is set in a state in which a distal end portion of the trocar 1 projects slightly from the distal end of the catheter 3. To form a catheter with a trocar. As shown in FIG. 2 showing the tip portion thereof, the catheter 3 is constructed integrally with the adapter 4, and the tip of the catheter 3 has a tip tip 2 having a step 2a. The trocar 1 is composed of a trocar outer tube 7 and a trocar inner needle 6 that is fitted in the inner cavity of the trocar 1, and the trocar 1 is inserted into the inner cavity of the catheter 3 from the adapter 4 side. The tip is set so that the step 2a serves as a stopper and does not project further. The trocar 6 has a hollow portion 6a like an injection needle (not shown), and its tip also has a tip shape like an injection needle.

In addition to the above embodiment, the trocar needle 1 is one in which the trocar inner needle 6 and the trocar outer tube 7 are integrally molded, or the trocar inner needle 6 is not hollow. However, both are made of metal as in the past. If the trocar inner needle 6 is hollow as in the present embodiment, even if this state, that is, the state in FIG. There are advantages that can be implemented.

In the present invention, as shown in FIG. 3, the outer surface of the trocar outer tube 7 which is in contact with the inner cavity of the catheter 3 has the rough surface portion 8. Conventionally, the rough surface portion 8 is mirror-finished to have a rough mirror surface, but as shown in the figure, the entire surface of the trocar outer tube 7 is processed into a rough surface. The degree of roughness, that is, the surface roughness, can be used, for example, from a fine one in which the mirror-like state of a smoky state is broken to a relatively rough surface in a fine knurled state. The rough surface portion 8 may be formed on a part of the outer surface in addition to the above-mentioned entire surface. However, in the case of a part, it is necessary to raise the peak part of the rough surface a little higher than the mirror part.

Next, the operation will be described. In using the catheter with a trocar according to the present invention, as shown in FIG. 1, only the trocar 1 after puncture is punctured from the distal end while the trocar 1 and the catheter 3 are set. After being removed, the catheter 3 with the adapter 4 is left in the body and various medical treatments are performed through the catheter 3. The adapter 4 is connected to a device for draining liquid and the like, but the details thereof are not directly related to the gist of the present invention, and therefore the description thereof is omitted.

In this case, for example:

That is, since there is no rough surface portion 8 in the past, the outer surface of the trocar outer tube 7 and the inner surface of the catheter 3 are smooth surfaces, and the material of the catheter 3 is PVC or PUR. Because of the softness, etc., they may come into close contact with each other and the movement may not be smooth when the trocar 1 is removed from the catheter 3 or conversely the trocar 1 is passed through the catheter 3. In addition to solving these problems, for example, in the case of a thin size, there has been a demand to increase the outer diameter of the trocar 1 as much as possible in order to prevent the trocar 1 from bending during puncture. If this is attempted, the gap between the inner surface of the catheter and the inner surface of the catheter becomes smaller, resulting in the problem of easier adhesion. The rough surface portion 8 was provided, but by forming this rough surface portion 8, it was possible to obtain a favorable result as described above.

[0015]

[Effect of device]

 As described above, according to the present invention, all or a part of the outer surface of the trocar that contacts the lumen of the catheter of the catheter with the trocar is roughened, and the trocar is attached to the catheter 3 in advance. When inserting 1 or puncturing the body in this state and then removing only the trocar 1, the rough surface portion 8 is formed on the outer surface of the trocar outer tube 7 of the trocar 1. The trocar outer tube 7 and the inner cavity of the catheter 3 are prevented from adhering to each other, and smooth operation is possible without sticking to each other, and a trocar catheter with safe operability can be obtained. is there.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a catheter with a trocar according to the present invention.

FIG. 2 is an enlarged sectional view of a tip portion of FIG.

FIG. 3 is a plan view of the trocar of the present invention.

[Explanation of symbols]

 1 trocar 2 tip 2a step 3 catheter 4 adapter 5 hub 6 trocar inner needle 6a hollow part 7 trocar outer tube 8 rough surface part

Claims (1)

[Scope of utility model registration request] 1. A trocar needle or an inner trocar needle which is formed so as to be insertable into an inner lumen of a catheter and comprises an outer trocar tube and an inner trocar needle inserted into the inner lumen for use. A catheter with a trocar in which at least a part of the outer surface of the trocar needle in which the needle and the trocar outer tube are integrally molded or the trocar inner needle is not hollow is roughened.