JP2501160Y2 - Balloon catheter with temperature sensor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balloon catheter with a temperature sensor, and more particularly to a balloon catheter capable of measuring the temperature of living tissue outside the balloon when the balloon is inflated.

[0002]

2. Description of the Related Art Balloon catheters with various sensors are
It is already well known. However, conventional catheters
For example, as shown in Japanese Patent Laid-Open No. 64-2625, a sensor is attached to the lumen of the catheter body.

[0003]

Therefore, when measuring the temperature of, for example, a living tissue using the above-described sensor of the catheter, the temperature of the living tissue is not measured because of the distance between the sensor and the living tissue. There is a problem that it is difficult to measure accurately.

In view of the above, the present invention solves the above-mentioned conventional problems and enables the sensor to be arranged at a position as close as possible to the living tissue, and to accurately measure the temperature of the living tissue. An object is to provide an attached balloon catheter.

[0005]

In order to achieve the above object, the invention of claim 1 is a catheter having a balloon attached to the distal end of a catheter body, wherein a temperature sensor is attached to the balloon and the temperature sensor is attached to the balloon. Conductive wires from the sensor are laid loosely in places in the lumen of the balloon and catheter body. According to a second aspect of the present invention, in the first aspect, the temperature sensor is attached to the central portion of the catheter body in the longitudinal direction of the balloon.

According to a third aspect of the invention, in the second or third aspect of the invention, the balloon is composed of an inner balloon and an outer balloon which are doubly arranged, and a temperature sensor is bonded between these balloons with an adhesive. . The invention of claim 4 is the device of any one of claims 1 to 3, wherein a plastic tube is disposed in the lumen of the catheter body near the balloon, and the conductive wire is slack in the plastic tube. It is stored.

[0007]

According to the catheter having the temperature sensor attached to the balloon as described above, when the balloon is inflated and fixed at the position of the living tissue to be measured, the sensor attached to the balloon is placed as close as possible to the living tissue. By being arranged at the position, the temperature of the living tissue can be accurately measured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially enlarged sectional view of the distal end portion of a catheter showing an embodiment of the present invention. Reference numeral 1 denotes a catheter body made of silicone rubber or the like, and a balloon 2 is attached to a tip portion of the catheter body 1. Balloon 2
Consists of an inner balloon 3 and an outer balloon 4 which are arranged in double. A temperature sensor 5 is adhered to the central portions of the balloons 3 and 4 in the longitudinal direction of the catheter body 1 with an adhesive 6 while being sandwiched between the balloons 3 and 4. In this example, only one temperature sensor 5 is provided around the balloon 2, that is, around the central axis of the catheter body 1, but a plurality of temperature sensors 5 may be provided if necessary.

Reference numeral 7 is a conductive wire whose one end is connected to the temperature sensor 5, and the other end of the conductive wire 7 is opened between one of the balloons 3 and 4 and is opened in one mounting portion of the balloon. It is pulled out from 8. The lumen 8 is formed adjacent to the central lumen 10 of the catheter body 1 in the lengthwise direction for a conductive wire, and has an opening bent in a substantially L shape near the attachment portion. A plastic tube 11 is bent and fixed to the inner cavity 8 near the opening, and the conductive wire 7 is wound in the plastic tube 11 so as not to be cut by the expansion of the balloon 2 with good slipperiness, for example, in a spiral shape. It is stored in a loose state. Reference numeral 12 is a thin plastic tube that guides the conductive wire 7 in a slippery manner. Of course, the plastic tube 11 and the plastic tube 12 may be integrally molded. The plastic tube 12 guides the conductor wire 7 without slack. Reference numeral 13 is a plug attached to the other end of the conductive wire 7.

When arranging the conductive wire 7, it is preferable to loosen the conductive wire 7 between the sensor 5 and the tube 12 as shown in the drawing. This is to prevent disconnection due to the initial expansion of the balloon 2.

When measuring the temperature of the living tissue in the above, after placing the balloon 2 attached to the distal end of the catheter body 1 inserted into the living body so as to face the living tissue to be measured, the balloon is placed in the balloon. Air or the like is introduced from an unillustrated lumen to inflate and fix the balloon 2. FIG. 1 shows a state where the balloon 2 is inflated. When the balloon 2 is inflated, the conductive wire 7 moves following the inflation of the balloon 2 without being disconnected due to the slack between the sensor 5 and the tube 12 and the pulling out from the tube 11. When the balloon 2 is inflated, the sensor 5 attached to the balloon 2 is arranged with the outer balloon 4 separated from the living tissue to be measured, so that the temperature of the living tissue can be measured by the sensor 5. .

In the embodiment, the balloon 2 has an inner / outer double structure, but this is a preferred example, and the present invention is not limited to the illustrated one. The sensor 5 may be attached to the outer side surface or the inner side surface of a single-layered balloon, and various modifications can be made. Further, it goes without saying that the position where the slack of the conductive wire 7 is provided, the manner in which the slack is provided, and the like can be changed and modified to those other than those illustrated.

[0013]

According to the invention of claim 1, the temperature sensor is constructed by inserting the catheter main body into the living body so that the balloon faces the living tissue to be temperature-measured, and inflating the balloon. Can be arranged at a position as close as possible to the living tissue, and the temperature of the living tissue can be accurately measured using this sensor. Moreover,
Since the conductive wire is loosened in places, the conductive wire does not break when the balloon expands. According to the second aspect of the present invention, the temperature can be measured at the central portion of the living tissue, and the measurement becomes more reliable.

According to the third aspect of the present invention, the temperature sensor can be easily attached, and since the conductive wire does not go out of and inside the balloon, a harmful effect caused by the wire, for example, an electrical adverse effect on the living tissue may occur. Can be eliminated. According to the fourth aspect, even if an external stress is applied to the conductive wire carelessly, the conductive wire housed in the plastic tube with a slack is stretched, so that the disconnection accident of the conductive wire can be prevented.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a distal end portion of a catheter showing an embodiment of the present invention.

[Explanation of symbols]

 1 Catheter body 2 Balloon 3 Inner balloon 4 Outer balloon 5 Temperature sensor 6 Adhesive 7 Conductive wire 8 Lumen 11 Plastic tube

Claims (4)

(57) [Scope of utility model registration request] 1. A catheter having a balloon attached to the distal end of a catheter body, wherein a temperature sensor is attached to the balloon, and a conductive wire is loosened from the temperature sensor to the inner cavity of the balloon and the catheter body. A balloon catheter with a temperature sensor. 2. The temperature sensor is attached to the central portion of the catheter body in the lengthwise direction of the balloon.
The balloon catheter with the temperature sensor described. 3. The balloon catheter with a temperature sensor according to claim 1, wherein the balloon is composed of an inner balloon and an outer balloon which are doubly arranged, and the temperature sensor is adhered between the both balloons with an adhesive. 4. A plastic tube is provided in the lumen of the catheter body near the balloon, and the conductive wire is housed in the plastic tube in a loosened state.
The balloon catheter with a temperature sensor as described in any one of 1-5.