JP2015192854A - Temperature measuring catheter and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measuring catheter that has preferable temperature response characteristic and capable of holding sufficient strength, and to provide a manufacturing method therefor.SOLUTION: In the temperature measuring catheter, multiple cylindrical thermal conduction chips 23 are arranged while being spaced apart from one another at predetermined intervals. Multiple temperature sensors 32 come into contact with respective multiple thermal conduction chips. An elastic cover member 21 is integrally provided between mutual multiple thermal conduction chips, and in each thermal conduction chip.

Description

  Embodiments of the present invention are applied to treatment of a built-in disease using, for example, a catheter, and relate to a temperature measuring catheter that measures the temperature in the vicinity of an affected area and a method for manufacturing the same.

  For example, ablation treatment in which a living tissue is cauterized is performed as a means for treating a heart disease such as atrial fibrillation. This ablation treatment is a treatment in which a catheter is inserted into a vein and guided to an affected part of the heart and, for example, high-frequency energy is radiated from the tip of the catheter to cauterize a living tissue (see, for example, Patent Document 1 and Patent Document 2). When performing this ablation treatment, it is necessary to suppress damage to normal tissue near the affected area, for example, the esophagus, by high-frequency energy. For this reason, a catheter having a temperature sensor (hereinafter referred to as a temperature measuring catheter) is inserted into the esophagus to monitor the temperature of the esophagus (see, for example, Patent Document 3 and Patent Document 4).

  In general, a temperature measuring catheter has a plurality of thermocouples, and is configured to monitor the temperature measured by these thermocouples.

  As described above, since the temperature measuring catheter has a plurality of thermocouples and needs to have a small diameter, it is difficult to reliably cover the thermocouples. In addition, when the thermocouple is covered with a thick tube, the response characteristic to temperature deteriorates, and when it is covered with a thin tube, there is a possibility that sufficient strength cannot be obtained and breakage occurs.

Japanese Patent No. 3564141 Japanese Patent No. 5160716 JP2013-202264A Special table 2010-505592

  Embodiments of the present invention are intended to provide a temperature measuring catheter that has good temperature response characteristics and can maintain sufficient strength, and a method for manufacturing the temperature measuring catheter.

  The temperature measuring catheter according to the present embodiment includes a plurality of cylindrical heat conduction tips arranged at a predetermined interval, a plurality of temperature sensors in contact with each of the plurality of heat conduction tips, and the plurality of heat conductions. A covering member having elasticity and provided integrally between the chips and inside each heat conduction chip is provided.

  In the method of manufacturing a temperature measuring catheter according to the present embodiment, a plurality of cylindrical heat conduction chips each having a temperature sensor in contact with the inner surface are arranged at a predetermined interval, the heat conduction chips are arranged between each other, and each An elastic covering member is integrally formed inside the heat conducting chip.

The figure which shows the system structural example of the temperature measuring catheter which concerns on this embodiment. The perspective view which shows roughly the temperature measuring catheter which concerns on this embodiment. The perspective view which decomposes | disassembles and shows the temperature measurement catheter shown in FIG. The side view which shows an example of the heat conductive chip | tip shown in FIG. Sectional drawing along the VV line | wire of FIG. Sectional drawing which shows the example which formed the coating | coated member in the heat conductive chip. Sectional drawing which shows the 1st modification of this embodiment. Sectional drawing which shows the 2nd modification of this embodiment. Sectional drawing which shows the 3rd modification of this embodiment. The side view which shows the state which bent the temperature measuring catheter of the 3rd modification, and shows only the principal part. Sectional drawing which shows the 4th modification of this embodiment. The side view which shows the state which bent the temperature measuring catheter of the 4th modification, and shows only the principal part.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same parts are denoted by the same reference numerals.

  FIG. 1 shows a system configuration example of a temperature measuring catheter according to the present embodiment. The temperature measuring catheter 11 is connected to one end of the cable 12, and the other end of the cable 12 is connected to the connector portion 13. For example, a transesophageal extracorporeal cardiac pacemaker 14 for performing ablation treatment is connected to the first end of the connector portion 13. A communication device 15 is connected to the second end of the connector unit 13, and this communication device 15 is connected to, for example, a computer as the control unit 16.

  The temperature measuring catheter 11 is, for example, disposable, and can be replaced by removing the transesophageal extracorporeal cardiac pacemaker 14 and the communication device 15 from the connector portion 13. In FIG. 1, a range surrounded by a broken line indicates a disposable part 17 that can be disposable.

  Moreover, the connector part 13 incorporates the memory 18, for example. The memory 18 stores correction data for correcting temperature data measured by the temperature measuring catheter 11, for example.

  Although the memory 18 is disposed in the connector unit 13, the present invention is not limited to this. For example, the memory 18 may be disposed in the temperature measuring catheter 11, the communication device 15, or the control unit 16. In other words, the memory 18 can be arranged other than the disposable unit 17.

  The communication device 15 communicates with the control unit 16 and the temperature measuring catheter 11. That is, the communication device 15 supplies an address and a read command for designating a temperature sensor, which will be described later, to the temperature measuring catheter 11 in accordance with a command issued from the control unit 16, and the temperature data output from the temperature measuring catheter 11 is transmitted to the control unit. 16 is supplied.

  The communication device 15 and the control unit 16 are not limited to wired connection, and can be connected wirelessly. Furthermore, the communication device 15 may be provided in the control unit 16.

  The control unit 16 controls the operation of the temperature measuring catheter 11. The control unit 16 issues a command to the communication device 15, acquires temperature data from the temperature measuring catheter 11 via the communication device 15, and reads correction data from the memory 18.

  Moreover, the control part 16 has the correction | amendment part 19, for example. The correction unit 19 corrects the temperature data supplied from the temperature measuring catheter 11 in accordance with the correction data read from the memory 18, and displays it on a display unit (not shown). Although this correction | amendment part 19 was arrange | positioned at the control part 16, it is not restricted to this, It is also possible to arrange | position to the communication apparatus 15. FIG.

  FIG. 2 schematically shows the temperature measuring catheter 11 according to the present embodiment. The temperature measuring catheter 11 is inserted into the esophagus in order to monitor the temperature of the esophagus during ablation treatment. For insertion, for example, both the oral and nasal passages can be easily inserted, and the diameter of the temperature measuring catheter 11 is reduced.

  The temperature measuring catheter 11 according to this embodiment includes a base portion 11a, a sensing portion 11b, and a distal end portion 11c. The base portion 11a, the sensing portion 11b, and the distal end portion 11c are integrally covered with a covering member 21 and have a seamless structure. The covering member 21 is made of an elastic material such as silicone rubber. However, it is not limited to silicone rubber. In FIG. 2, for convenience of explanation, the covering member 21 is described as transparent, but the covering member 21 is made of an opaque silicone rubber, for example.

  The base 11a includes a communication buffer integrated circuit (hereinafter simply referred to as a communication buffer circuit) for communicating with a plurality of temperature sensors provided in the sensing unit 11b, a pacing electrode 22, and the like. The electrode 22 is exposed from the covering member 21.

  The sensing unit 11b is provided with a temperature sensor integrated circuit (not shown) (hereinafter simply referred to as a temperature sensor), a plurality of heat conduction chips 23, a pacing electrode 37a, and the like. The pacing electrode 37a is exposed from the covering member 21. As will be described later, each heat conduction chip 23 has, for example, a cylindrical shape or a ring shape having a circular or elliptical cross section, and the heat conduction chips 23 are arranged at a predetermined interval. A temperature sensor is in contact with the inner surface of each heat conducting chip 23 directly or via another member having high heat conductivity. This temperature sensor has an identification address, for example, and outputs measured temperature data according to an address and a read command supplied via the communication buffer.

  The distal end portion 11c has a diameter that gradually decreases from the sensing portion 11b toward the distal end, and is configured to be easily inserted into the body.

  FIG. 3 shows the temperature measuring catheter 11 in an exploded manner. Inside the temperature measuring catheter 11, for example, a flexible printed board (hereinafter referred to as a flexible printed board) 31 is disposed. On the surface of the flexible printed board 31, a plurality of temperature sensors 32, a communication buffer circuit 33, and a plurality of connection terminals 34 to which wirings (not shown) are connected are arranged.

  Each temperature sensor 32 is arranged at a predetermined interval corresponding to each heat conduction chip 23. A reinforcing plate 35 is attached to the back surface of the flexible printed circuit board 31 with an adhesive sheet 36 corresponding to each temperature sensor 32, communication buffer circuit 33, and connection terminal 34. 2 and 3, the number of heat conduction chips 23 and the number of temperature sensors are eight, but the present invention is not limited to this.

  The pacing electrode 22 is provided with a stepped portion 22a on which the flexible printed board 31 is placed, an insertion hole 22c of the stylet tube 41, and an insertion hole 22c of a pacing electrode cable (not shown).

  The flexible printed circuit board 31 having the above-described configuration is inserted into the pacing electrode 22, and the heat conducting chip 23 is brought into contact with each temperature sensor 32. In this state, for example, an adhesive is filled around the temperature sensor 32, and the temperature sensor 32 and the heat conduction chip 23 are fixed.

  In addition, a pacing socket 37 that serves both as a pacing electrode and a socket is fitted into the distal end portion of the flexible printed circuit board 31. A flange-shaped pacing electrode 37 a is provided around the center of the pacing socket 37 in the longitudinal direction, and a notch 37 b is provided at one end of the pacing socket 37. The leading end of the flexible printed circuit board 31 is fitted into the notch 37b. Part of the pacing socket 37 is provided with an insertion hole 37c for the stylet tube 41 and an insertion hole 37d for a pacing electrode cable (not shown).

  Further, an opening 37e communicating with the notch 37b is provided in a part of the pacing socket 37, and an opening 31a is provided at the tip of the flexible printed board 31 corresponding to the opening 37e. In a state where the leading end of the flexible printed circuit board 31 is fitted in the notch 37b, the pins 38 are inserted into the openings 37e and 31a, and the pacing socket 37 is fixed to the flexible printed circuit board 31.

  A stylet tube 41 is inserted into the insertion hole 22 b of the pacing electrode 22, the plurality of heat conduction chips 23, and the insertion hole 37 c of the pacing socket 37. A stylet (not shown) is inserted into the stylet tube 41. A let wire can be inserted. Further, wiring (not shown) is inserted into the insertion hole 22 c of the pacing electrode 22 and the insertion hole 37 d of the pacing socket 37.

  4 and 5 show an example of the heat conduction chip 23. As shown in FIGS. 4 and 5, each temperature sensor 32 is brought into contact with the inside of a cylindrical or ring-shaped heat conduction chip 23. The heat conducting chip 23 is made of a material having high heat conductivity, for example, stainless steel, and has a convex portion 23a having a flat surface inside. The temperature sensor 32 is in contact with the convex portion 23a. Thus, the response of the temperature sensor 32 can be improved by bringing the temperature sensor 32 into contact with the convex portion 23a having a flat surface. In a state where the temperature sensor 32 is in contact with the convex portion 23a, the adhesive 39 is applied to the surface of the flexible printed board 31 and around the temperature sensor 32, and the temperature sensor 32 and the convex portion 23a are fixed. As the adhesive, an adhesive having high thermal conductivity is preferable.

  As described above, the pacing electrode 22, the plurality of heat conductive chips 23, the pacing socket 37, and the stylet tube 41 are mounted on the flexible printed board 31, and a mold (not shown) is used and shown in FIG. The covering member 21 is integrally formed, and a base portion 11a, a sensing portion 11b, and a distal end portion 11c that cover the flexible printed circuit board 31 are formed. As a result, the covering member 21 is filled between the plurality of heat conduction chips 23, between the pacing electrode 22 and the heat conduction chip 23, and between the heat conduction chip 23 and the pacing socket 37, and the pacing electrode 22, The heat conduction chip 23 and the pacing electrode 37 a are exposed from the covering member 21.

  5 and 6 show a state in which the covering member 21 is formed on the heat conducting chip 23. FIG.

  The covering member 21 is filled between the heat conductive chips 23 and inside the heat conductive chips 23. The peripheral edges of both ends of the heat conducting chip 23 have a step portion 23b, and the covering member 21 is also formed on the step portion 23b. In the state where the covering member 21 is formed on the stepped portion 23b, the surface of the covering member 21 and the surface of the heat conducting chip 23 are flattened.

  Furthermore, the covering member 21 is also filled in the heat conducting chip 23, and the heat conducting chip 23 and the covering member 21 are integrated with sufficient strength.

  As described above, each heat conduction chip is provided with the temperature sensor 32. When the temperature sensor 32 is a thermocouple, for example, each thermocouple has a measurement error. In the present embodiment, accurate temperature measurement is possible by correcting the measurement error of each thermocouple.

  Specifically, when different temperatures of the liquid are measured with one thermocouple, a measurement error occurs for each temperature. For example, when measuring a liquid at 30 ° C., the thermocouple is “30 + α ° C.”, when measuring a liquid at 36 ° C., “36 + β ° C.”, when measuring a liquid at 40 ° C., “40 + γ ° C.” It contains a slight measurement error.

  The above measurement result is approximated by a straight line, and based on this straight line, the relationship between the temperature of the liquid and the output temperature of the thermocouple is expressed by, for example, a linear function as shown in Equation (1).

y = ax + b (1)
Here, y is the output temperature of the thermocouple, x is the temperature of the liquid, a is the slope when the measured temperature is approximated by a straight line, and b is the temperature at the intersection of the straight line and the y-axis.

  The ideal function of the thermocouple is as shown in equation (2).

y = x (2)
For this reason, it is necessary to correct Formula (1) with Formula (2). The correction value in which the slope “ax” in equation (1) is “1” is “1 / a”, and the correction value in which the constant “b” is zero is “−b”. The correction values “1 / a” and “−b” are stored in the memory 18 as thermocouple correction values.

  In the case of this embodiment, the temperature measuring catheter 11 has, for example, eight thermocouples. Therefore, correction values “1 / a” and “−b” are obtained in advance corresponding to the eight thermocouples, and these correction values (hereinafter referred to as correction data) are stored in the memory 18. That is, the correction data of each thermocouple is stored in the memory 18 corresponding to the address of each thermocouple.

  When correcting the data measured by the thermocouple, correction data corresponding to the thermocouple address is read from the memory 18. This correction data is assigned to “a, b” in equation (1) by the correction unit 19, and the measured temperature data is assigned to “x” in equation (1) to correct the corrected temperature. Data is required.

  It is to be noted that correction data is previously substituted into the above formulas (1) and (2), a correction table indicating the measured temperature and the corrected temperature is created for each thermocouple, and this correction table may be stored in the memory 18. . In this case, since there is no need for calculation, the correction unit 19 is unnecessary.

  According to the above embodiment, the plurality of temperature sensors 32 are arranged on the flexible printed circuit board 31, and each temperature sensor 32 is in contact with the heat conduction chip 23 and is flexible so as to expose the plurality of heat conduction chips 23. A covering member 21 that covers the printed circuit board 31 is integrally formed. For this reason, manufacture can be facilitated compared with the case where a tube is used.

  In addition, since it is not necessary to cover the heat conducting chip 23 and the temperature sensor 32 using a tube, the temperature response characteristic of the temperature sensor 32 does not depend on the thickness of the tube. For this reason, the temperature response characteristic of the temperature sensor 32 can be improved, and the measurement accuracy can be improved.

  The covering member 21 is also filled in the heat conducting chip 23, and the convex portion 23 a and the temperature sensor 32 provided inside the heat conducting chip 23 function as an anchor of the covering member 21. For this reason, it is possible to fix the heat conductive chip 23 and the covering member 21 with sufficient strength.

  Furthermore, the flexible printed circuit board 31 is integrally covered with the covering member 21, and the covering member 21 has a seamless structure. For this reason, it is possible to prevent the intrusion of body fluid or the like into the temperature measuring catheter 11, and it is possible to ensure stable operation performance.

(First modification)
FIG. 7 shows a first modification of the above embodiment. In the above embodiment, a temperature sensor integrated circuit is used as the temperature sensor 32. In contrast, the first modification uses a thermistor 51 as the temperature sensor 32.

  The heat conduction chip 23 has a thick protruding portion 23c in a part thereof, and an accommodating portion 23d is formed in the protruding portion 23c. The thermistor 51 is accommodated in the accommodating portion 23d of the heat conducting chip 23, and is fixed by an adhesive 52 having a high heat conductivity.

  In addition, a stylet tube 41 is arranged inside the heat conduction chip 23, and a plurality of wirings 53 of a plurality of thermistors 51 are arranged around the stylet tube 41, for example. FIG. 7 shows a case where eight thermistors 51 and eight heat conduction chips 23 are used. In this state, similarly to the above embodiment, the covering member 21 is integrally formed between and inside each heat conducting chip 23, and the temperature measuring catheter shown in FIG. 2 is formed.

  The mounting of the thermistor 51 is not limited to the above configuration. For example, the heat conducting chip 23 may have a configuration in which the thermistor 51 is not bonded to the inner surface of the heat conducting chip 23 without having the protruding portion 23 c.

  According to the first modification, the thermistor 51 can be reliably brought into contact with the heat conducting chip 23, and the heat conducting chips 23 can be covered with each other without using a tube. For this reason, the temperature response characteristic of the thermistor 51 can be improved, and the measurement accuracy can be improved.

  Furthermore, since the covering member 21 is also filled in the heat conduction chip 23, the heat conduction chip 23 and the covering member 21 can be fixed with sufficient strength.

(Second modification)
FIG. 8 shows a second modification of the present embodiment. In the first modification, the thermistor 51 is used as the temperature sensor. On the other hand, the second modification uses a thermocouple 61 as the temperature sensor 32.

  The thermocouple 61 is welded, for example, to a part of the ring-shaped heat conducting tip 23.

  In addition, a stylet tube 41 is arranged inside the heat conduction chip 23, and a plurality of wires 62 of a plurality of thermocouples 61 are arranged around the stylet tube 41, for example. FIG. 8 shows a case where eight thermocouples 61 and eight heat conduction chips 23 are used. In this state, similarly to the above embodiment, the covering member 21 is integrally formed between and inside each heat conducting chip 23, and the temperature measuring catheter shown in FIG. 2 is formed.

  According to the second modified example, as in the above embodiment, the thermocouple 61 can be reliably brought into contact with the heat conducting chip 23, and the heat conducting chips 23 are covered with each other without using a tube. can do. For this reason, the temperature response characteristic of the thermocouple 61 can be improved, and the measurement accuracy can be improved.

  Furthermore, since the covering member 21 is also filled in the heat conduction chip 23, the heat conduction chip 23 and the covering member 21 can be fixed with sufficient strength.

  In addition, although the said embodiment demonstrated the case where a temperature measuring catheter was applied to a transesophageal external cardiac pacemaker, it is not limited to this, It is also possible to apply to pacemakers other than a transesophageal external cardiac pacemaker. It is. In addition to the ablation treatment described in the embodiment, it can also be used for monitoring body temperature during and after surgery. When measuring the esophageal temperature, the tip of the temperature measuring catheter of the present invention is inserted into the esophagus from the nasal cavity, and the temperature sensing part is arranged at a predetermined position (for example, a position 35 to 40 cm from the insertion part). Note that a pacemaker is not necessary when used for a body temperature monitor or the like.

(Third Modification)
In the above embodiment, the surface of the heat conducting chip 23 and the surface of the covering member 21 are flattened as shown in FIG. However, when inserting the temperature measuring catheter 11 into the esophagus, for example, from the nasal cavity, if the temperature measuring catheter 11 is bent, the edge of the heat conducting tip 23 may be separated from the covering member 21 and protrude from the surface of the covering member 21. . In this case, the edge of the heat conduction chip 23 may damage the mucous membrane in the nasal cavity and cause bleeding. For this reason, it is necessary to prevent damage to the living tissue due to the edge of the heat conducting chip 23.

  FIG. 9 shows a third modification of the present embodiment. FIG. 9 shows a part of a cross-sectional view along the longitudinal direction of the temperature measuring catheter. In FIG. 9, parts other than the heat conduction chip 23 and the covering member 21 are omitted. The diagram surrounded by a broken-line circle shows an enlarged view of the connection portion between the heat conducting chip 23 and the covering member 21 surrounded by a solid-line circle.

  In the third modified example, as shown in FIG. 9, the outer diameter of the covering member 21 is set larger than the outer diameter of the heat conducting chip 23, and both ends of the heat conducting chip 23 are covered with the covering member 21. . Specifically, a recess 21 a is formed around the covering member 21 to expose the surface other than both end portions of the heat conducting chip 23, and both end portions of the heat conducting chip 23 are formed inside the covering member 21. Has been placed. For this reason, the edge of the heat conductive chip 23 is not exposed.

  The temperature measuring catheter 11 having the above-described configuration can be manufactured, for example, as follows. The covering member 21 is formed integrally with the heat conducting chip 23 and the like, as in the above embodiment. At this time, the covering member 21 is also integrally formed on the surface of the heat conducting chip 23. Thereafter, the covering member 21 in a predetermined range is removed from both ends of the heat conducting chip 23, and the surface of the heat conducting chip 23 is exposed.

  Alternatively, it is possible to form the covering member 21 having the concave portion 21a without removing the covering member 21 after molding by forming a convex portion corresponding to the concave portion 21a in a mold (not shown).

  FIG. 10 shows a case where the temperature measuring catheter 11, that is, the covering member 21 is bent. Since both ends of the heat conducting tip 23 are covered with the covering member 21, the edge of the heat conducting tip 23 does not protrude from the surface of the covering member 21 even when the temperature measuring catheter 11 is bent.

  Therefore, according to the third modified example, even when the temperature measuring catheter 11 is bent, the edge of the heat conducting tip 23 does not protrude from the surface of the covering member 21, so that it is possible to prevent damage to living tissue and safely It is possible to use a temperature measuring catheter.

(Fourth modification)
FIG. 11 shows a fourth modification of the present embodiment. FIG. 11 shows a part of a sectional view along the longitudinal direction of the temperature measuring catheter, similarly to FIG. 9.

  In the third modification, the outer diameter of the covering member 21 is larger than the outer diameter of the heat conducting chip 23, and the peripheral edges of both ends of the heat conducting chip 23 are covered with the covering member 21.

  On the other hand, in the fourth modified example, the outer diameter of the covering member 21 is larger than the outer diameter of the heat conducting chip 23, and the peripheral edge and the side surface 23 e of the heat conducting chip 23 are not covered by the covering member 21. Is exposed. Specifically, on the surface of the covering member 21, a deep concave portion 21 b that is larger than the third modification is formed corresponding to the heat conduction chip 23.

  That is, the covering member 21 corresponds to a portion where the heat conducting chip 23 is disposed, and is slightly longer than the length of the heat conducting chip 23 around the surface, from the surface of the covering member 21 to the inner surface of the heat conducting chip 23. A recess 21b having a substantially equal depth is provided. The heat conducting chip 23 is disposed at a substantially central portion in the length direction of the concave portion 21b. For this reason, the peripheral edge and the side surface 23 e of both ends of the heat conducting chip 23 are exposed from the covering member 21, but the surface of the heat conducting chip 23 does not protrude from the surface of the covering member 21. Further, a gap is provided between the side surface 23e of the heat conducting chip 23 and the side surface 21c of the recess 21b.

  The temperature measuring catheter having the above-described configuration can be manufactured, for example, by forming a convex portion having a shape corresponding to the concave portion 21b and the heat conducting chip 23 in a mold (not shown).

  FIG. 12 shows a case where the temperature measuring catheter 11, that is, the covering member 21 is bent. Since the heat conducting tip 23 is disposed in the recess 21 b, the edge of the heat conducting tip 23 does not protrude from the surface of the covering member 21 even when the temperature measuring catheter 11 is bent.

  Therefore, according to the fourth modified example, even when the temperature measuring catheter 11 is bent, the edge of the heat conducting tip 23 does not protrude from the surface of the covering member 21, thereby preventing damage to living tissue and safely It is possible to use a temperature measuring catheter.

  In addition, since the side surface 23e of the heat conducting chip 23 is not covered with the covering member 21, the contact area between the heat conducting chip 23 and the body is increased as compared with the third modification. Therefore, the temperature response characteristic of the temperature sensor 32 can be improved and the measurement accuracy can be improved.

  Furthermore, since a gap is provided between the side surface 23e of the heat conducting chip 23 and the side surface 21c of the recess 21b, the side surface 23e of the heat conducting chip 23 and the side surface 21c of the recess 21b are in contact with each other. Thus, the flexibility of the temperature measuring catheter can be improved.

  In addition, in this embodiment and the said modification, you may provide a chamfer or a fillet in the peripheral edge of the both ends of the heat conductive chip 23. FIG. Thereby, since the inclination of the edge of the heat conductive chip | tip 23 can be made gentle, damage to a biological tissue can further be suppressed.

  In addition, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 11 ... Temperature measuring catheter, 21 ... Cover member, 23 ... Heat conduction chip, 31 ... Flexible printed circuit board, 32 ... Temperature sensor, 51 ... Thermistor, 61 ... Thermocouple.

Claims (5)

A plurality of cylindrical heat conduction chips arranged at predetermined intervals, and
A plurality of temperature sensors in contact with each of the plurality of heat conducting chips;
A temperature measuring catheter comprising: an elastic covering member provided integrally between the plurality of heat conducting tips and inside each heat conducting tip.   The temperature measuring catheter according to claim 1, wherein the plurality of temperature sensors are arranged on a flexible substrate and output an identification address and measured temperature data.   The temperature measuring catheter according to claim 1, wherein an outer diameter of the covering member is larger than an outer diameter of the heat conducting tip and covers both end portions of the heat conducting tip.   The temperature measuring catheter according to claim 1, wherein an outer diameter of the covering member is larger than an outer diameter of the heat conducting tip and both end portions of the heat conducting tip are exposed. A plurality of cylindrical heat conduction chips each having a temperature sensor in contact with the inner surface are arranged at a predetermined interval,
A method of manufacturing a temperature measuring catheter, wherein a covering member having elasticity is integrally formed between the plurality of heat conducting tips and inside each heat conducting tip.

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