JPS6041237Y2 - Medical equipment for inserting blood vessels - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a medical device for inserting into a blood vessel such as a catheter, and particularly to a medical device for inserting into a blood vessel that is suitable for holding an antithrombotic agent.

(b) Prior art and its problems The major problems with medical instruments such as catheters inserted into blood vessels when diagnosing, treating, and testing human diseases are as follows:
Blood reacts with the surfaces of these devices and blood clots are likely to form.

Therefore, it is necessary to avoid using the antithrombotic agent for a long period of time, or to continuously inject the antithrombotic agent by intravenous drip or the like when using the antithrombotic agent for a long period of time.

However, if too much antithrombotic agent is injected, a problem arises in that blood becomes difficult to coagulate at an incision for inserting a device or other damaged area.

Therefore, attempts have been made to immobilize the antithrombotic agent on the surface of the insertion device by physicochemical means, but it is difficult to immobilize the antithrombotic agent easily, its activity is impaired by the immobilization of the antithrombotic agent, and the amount of outflow is reduced. There are problems such as difficulty in control and inability to replenish supplies, making it ineffective.

(c) Means for solving the problems The purpose of this invention is to solve the above-mentioned problems with blood vessel insertion devices. It has a structure in which an antithrombotic agent retaining layer with numerous micropores is provided at intervals, and the antithrombotic agent is filled between the insertion section and the retaining layer, and the antithrombotic agent is released from the microscopic pores of the retaining layer. It is made to ooze out.

B) Example Figure 1 shows an example of this invention, in which a blood vessel insertion part 1 is covered with an antithrombotic agent holding layer 2 made of porous polytetrafluoroethylene or the like at a required interval. .

The antithrombotic agent 3 is filled and held between the insertion section 1 and the holding layer 2.

If the device is inserted into the blood vessel in this condition, the antithrombotic agent 3
permeates into the blood through the numerous micropores of the retention layer 2.

2 and 3 show the case of a catheter equipped with a transparent balloon 4, in which a balloon inflation fluid conduit 7, an observation light optical fiber 8, and an illumination light optical fiber 9 are inserted into the blood vessel insertion section 6. While sending light from a light source 10, the balloon 4 is pressed against the tissue of the living body, and internal viewing is performed through the eyepiece lens 11 while blood is excluded.

The blood vessel insertion part 6 of the catheter is covered with an antithrombotic agent holding layer 12 such as a Teflon tube with numerous fine holes at a required gap, and a tube 13 integrated with the holding layer 12 is used as a supply pump. Connected to 14.

The antithrombotic agent is quantitatively and continuously supplied under pressure from the pump 14, and is exuded into the blood vessel through the micropores of the retention layer 12.

(f) Effects As mentioned above, this device allows the antithrombotic agent to be injected into the living body while retaining the antithrombotic agent as it is with the antithrombotic agent retention layer, and does not immobilize the antithrombotic agent, so there is no risk of leakage. There is no difficulty in treatment techniques such as too much or too little amount.

In addition, although blood coagulation occurs on the surface of the insert, in this case the concentration of the antithrombotic agent is the highest, so compared to the conventional method of mixing the antithrombotic agent into the intravenous fluid,
Since only a small amount of antithrombotic agent is used, there is far less risk of bleeding to the human body.

Incidentally, if a tube communicating with the inside of the retention layer is provided as in the embodiment and the antithrombotic agent is supplied through this tube, continuous supply becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged cross-sectional view of an embodiment of this invention, FIG. 2 is a schematic plan view of another embodiment, and FIG. 3 is an enlarged cross-sectional view taken along the line ■--■ in FIG. 1... Blood vessel insertion part, 2... Antithrombotic agent holding layer, 3... Antithrombotic agent, 6... Blood vessel insertion part, 12... ...Antithrombotic agent retention layer.

Claims (2)

[Scope of utility model registration request] (1) A medical device for blood vessel insertion, which includes an antithrombotic agent holding layer having numerous micropores at a predetermined interval around the outer periphery of a blood vessel insertion portion. (2) The medical device for blood vessel insertion according to claim 1, wherein the holding layer is integrally provided with an antithrombotic drug supply tube.