Catheter device

Abstract

A catheter device according to the present disclosure comprises: a plurality of arms extending along an axial direction between a distal end part and a proximal end part and arranged in a first direction intersecting the axial direction; and a temperature sensor disposed on each of the plurality of arms. When viewed from the axial direction, the plurality of arms are deformable between a contracted state in which an interval between the arms at both ends in the first direction is a first interval and an expanded state in which the interval is a second interval larger than the first interval. When viewed in cross section from the axial direction, in each of the plurality of arms, a second dimension in a second direction intersecting the first direction is larger than a first dimension in the first direction.

Description

Catheter device

[0001] The present disclosure relates to a catheter device.

[0002] For example, Patent Document 1 discloses a catheter for monitoring a biological environment such as an esophageal environment. The catheter has one or more arm members and a temperature sensor provided on the arm member.

[0003] Japanese Patent Application Laid-Open No. 2017-148524

[0004] In recent years, in a catheter device provided with a temperature sensor, there has been a demand for a catheter device capable of more accurate temperature measurement.

[0005] An object of the present disclosure is to provide a catheter device capable of more accurate temperature measurement in a catheter device provided with a temperature sensor.

[0006] A catheter device according to an aspect of the present disclosure includes a plurality of arms extending axially between a distal end portion and a proximal end portion and arranged in a first direction intersecting the axial direction, and temperature sensors respectively disposed on each of the plurality of arms. When viewed from the axial direction, the plurality of arms are deformable between a contracted state in which the interval between the arms at both ends in the first direction is a first interval and an expanded state in which the interval is a second interval larger than the first interval. When viewed in cross-section from the axial direction, in each of the plurality of arms, a second dimension in a second direction intersecting the first direction is larger than a first dimension in the first direction.

[0007] According to the present disclosure, in a catheter device provided with a temperature sensor, a catheter device capable of more accurate temperature measurement can be provided.

[0008] Schematic perspective view of an example of an expanded catheter device according to Embodiment 1 of this disclosure Schematic cross-sectional a retracted catheter device according to Embodiment 1 of this disclosure Schematic cross-sectional view of an arm Schematic cross-sectional view of an example of an expanded catheter device according to Embodiment 1 in vivo Schematic cross-sectional view of an expanded catheter device according to Modification 1 of this disclosure Schematic cross-sectional view of an expanded catheter device according to Modification 2 of this disclosure Schematic cross-sectional view of an expanded catheter device according to Modification 3 of this disclosure Schematic perspective view of an expanded catheter device according to Modification 4 of this disclosure Schematic perspective view of an example of an expanded catheter device according to Embodiment 2 of this disclosure

[0009] (Background to this disclosure) For example, a catheter with a temperature sensor on its arm is known. For example, a user inserts the catheter into the esophagus and expands it, and the temperature sensor measures the temperature inside the esophagus.

[0010] However, the inner wall of the esophagus is folded in a way that forms multiple recesses. Therefore, depending on the shape and dimensions of the catheter arm, it may be difficult for the arm to enter these recesses. For example, if the arm has a diameter of 1 mm to 5 mm, which is larger than the recess, the arm will have difficulty entering the recess. If the arm cannot enter the recess, the temperature sensor may not be able to adequately detect the temperature of the esophagus.

[0011] Therefore, the inventors investigated the configuration of a catheter device that can measure temperature more accurately, leading to this disclosure.

[0012] Embodiment 1 of this disclosure will be described below with reference to the attached drawings. In addition, in each drawing, the elements are exaggerated to facilitate the explanation.

[0013] (Embodiment 1) [Overall Configuration] Figure 1 is a schematic perspective view of an example of a catheter device 1 in an expanded state according to Embodiment 1 of the present disclosure. Figure 2 is a schematic cross-sectional view of an example of a catheter device 1 in an expanded state according to Embodiment 1 of the present disclosure. Figure 3 is a schematic cross-sectional view of an example of a catheter device 1 in a retracted state according to Embodiment 1 of the present disclosure. Figure 4 is a schematic cross-sectional view of the arm 8A. Figures 2 to 4 show cross-sections cut in a direction perpendicular to the axial direction of the catheter device 1.

[0014] In the figure, the X, Y, and Z directions represent the lateral, vertical, and axial (longitudinal) directions of the catheter device 1, respectively.

[0015] As shown in Figure 1, the catheter device 1 comprises an arm member 2, a plurality of temperature sensors 4, and a sheath 6.

[0016] <Arm Member> The arm member 2 is a member that can be extended and retracted in the X direction and has a plurality (four in this embodiment) of arms 8A, 8B, 8C, and 8D. The arms 8A, 8B, 8C, and 8D extend along the Z direction between the tip portions 80A, 80B, 80C, and 80D and the end portions 81A, 81B, 81C, and 81D, and are arranged side by side in the X direction. In this specification, the direction along the Z direction means the direction in which the Z component is greater than the X component and the Y component. That is, the direction along the Z direction also includes directions inclined with respect to the Z direction. For example, the direction along the Z direction includes directions that have an inclination of 20° or less with respect to the Z direction. The arms 8A, 8B, 8C, and 8D are bundled together at the end portions 81A, 81B, 81C, and 81D (for example, the +Z side ends). At the tip sections 80A, 80B, 80C, and 80D (the -Z end), arms 8A and 8D are fixed to each other, and arms 8B and 8C are fixed to each other. On the other hand, at the tip sections 80A, 80B, 80C, and 80D, arms 8A and 8D are movable relative to arms 8B and 8C, respectively. Furthermore, at the tip sections 80A, 80B, 80C, and 80D, arms 8A, 8B, 8C, and 8D may each be movable relative to other arms.

[0017] The arm member 2 is deformable between an expanded state and a contracted state. As shown in Figures 1 and 2, the expanded state means that the arms 8A, 8B, 8C, and 8D are spread out in the X direction. As shown in Figure 3, the contracted state means that the arms 8A, 8B, 8C, and 8D are gathered toward the center C in the X direction. In the contracted state, the arms 8A, 8B, 8C, and 8D are stacked in the X direction, and adjacent arms may be in contact with each other.

[0018] As shown in Figure 2, in the extended state, the distance between arms 8A and 8D at both ends in the X direction is distance D1. In the retracted state, the distance between arms 8A and 8D in the X direction is distance D2, which is smaller than distance D1. In this embodiment, arms 8A, 8B, 8C, and 8D are arranged at equal intervals in the X direction in both the extended and retracted states.

[0019] The arm member 2 expands when arms 8A, 8B, 8C, and 8D are pushed out of the sheath 6, and contracts when arms 8A, 8B, 8C, and 8D are housed inside the sheath 6. Arms 8A, 8B, 8C, and 8D are treated with shape memory processing so that they change from a contracted state to an expanded state when pushed out of the sheath 6. For example, arms 8A, 8B, 8C, and 8D are given a bending tendency to curve in the Z direction and move away from the center C in the X direction. Specifically, arms 8A and 8B are given a bending tendency to bend in the -X direction, and arms 8C and 8D are given a bending tendency to bend in the +X direction. In this case, when housed inside the sheath 6, the bending tendencies of arms 8A, 8B, 8C, and 8D are straightened. When pushed out of the sheath 6, arms 8A, 8B, 8C, and 8D become freely deformable, bending along their bending tendencies and spreading in the X direction. Therefore, in this embodiment, the bending curvature is curved, but it may also be bent.

[0020] As shown in Figure 4, the arm 8A has a rectangular cross-section. Specifically, in the cross-section of the arm 8A, the dimension H1 in the Y direction is greater than the dimension T1 in the X direction. Preferably, the dimension H1 in the Y direction is greater than 10 times the dimension T1 in the X direction and less than 20 times the dimension T1 in the X direction. For example, the dimension H1 in the Y direction is 2 mm, and the dimension T1 in the X direction is greater than 0.1 mm and less than 0.2 mm.

[0021] In this embodiment, the other arms 8B, 8C, and 8D have the same cross-sectional shape as arm 8A.

[0022] Arms 8A, 8B, 8C, and 8D, having a rectangular cross-section, extend in the Y direction and have a pair of sides P1 and P2 that face each other in the X direction. The outer side P1 is the side facing away from the center C (Figure 2) of the arm member 2 in the X direction, and the inner side P2 is the side facing towards the center C. In arms 8A and 8B located on one side of the center C, the outer side P1 faces in the -X direction and the inner side P2 faces in the +X direction. In arms 8C and 8D located on the other side of the center C, the outer side P1 faces in the +X direction and the inner side P2 faces in the -X direction.

[0023] Arms 8A, 8B, 8C, and 8D are formed from, for example, Ni-Ti alloy, other Ti alloy, SUS304, etc. By forming them from a rigid material such as an alloy, bending of arms 8A, 8B, 8C, and 8D can be suppressed when a force in the Y direction is applied to them.

[0024] The arm member 2 further has a cap 10 that covers the -Z end of arms 8A, 8B, 8C, and 8D. The cap 10 is fixed only to arms 8A and 8D, and can be made movable relative to arms 8B and 8C by sliding. The cap 10 forms a recess that can accommodate, for example, the -Z end of arms 8A, 8B, 8C, and 8D. When the arm member 2 is housed in the sheath 6, the cap 10 protrudes at least partially from the sheath 6 in the Z direction.

[0025] In the following explanation, arms 8A, 8B, 8C, and 8D will be collectively referred to as arm 8.

[0026] In this embodiment, the arm member 2 has four arms 8A, 8B, 8C, and 8D, but is not limited to this, and the arm member 2 may have any number of arms, two or more.

[0027] <Sensors> Multiple temperature sensors 4 are sensors that can acquire temperature information around the temperature sensor 4. As the temperature sensor 4, for example, a thermistor, chip thermistor, thermocouple, semiconductor sensor, or a combination thereof can be used.

[0028] Multiple temperature sensors 4 are electrically connected to a control device (not shown) by wiring and are controlled by the control device. Temperature information measured by the multiple temperature sensors 4 is sent to the control device.

[0029] As shown in Figure 1, multiple temperature sensors 4 are arranged on each arm 8. The multiple temperature sensors 4 are arranged on the outer surface P1 of each arm 8. Specifically, the multiple temperature sensors 4 are located away from the ends of the arm 8 in the Y direction and are positioned near the center of the outer surface P1 in the Y direction. The temperature sensors 4 are located on the portion of the arm 8 that extends along the Z direction. The temperature sensors 4 are positioned at a predetermined distance from the portion that has been bent.

[0030] In this embodiment, the multiple temperature sensors 4 are arranged at equal intervals in the Y direction on each arm 8. Furthermore, the temperature sensors 4 arranged on different arms 8 are aligned in the X direction.

[0031] As shown in Figure 4, the temperature sensor 4 is laminated on the outer surface P1 via a flexible substrate 5. The flexible substrate 5 is electrically connected to the outer surface P1 of the arm 8 by electrodes 5A. The temperature sensor 4, flexible substrate 5, and arm 8 are covered and sealed with an insulating layer 7.

[0032] The dimension T2 in the X direction between the temperature sensor 4 covered by the insulating layer 7 and the flexible substrate 5 is smaller than the dimension T1 in the X direction of the arm 8. This structure improves the flexibility of the arm 8 and facilitates the expansion and contraction of the arm member 2. The dimension T2 is preferably smaller than 0.1 mm, for example, 0.08 mm.

[0033] <Sheath> Returning to Figure 1, the sheath 6 is a cylindrical member capable of housing the retracted arm member 2. When the arm member 2 is in the retracted state housed within the sheath 6, the user can pull the tip of the arm member 2 (the -Z end) out of the sheath 6, causing the arm member 2 to change to an expanded state. When the arm member 2 is housed within the sheath 6, the tip of the arm member 2 may protrude from the sheath 6 in the Z direction. This configuration facilitates the pulling out of the arm member 2.

[0034] By providing the sheath 6, it becomes easier to insert the catheter device 1 into the patient, and the temperature sensor 4 is prevented from detaching from the arm 8 during insertion.

[0035] Figure 5 is a schematic cross-sectional view of the catheter device 1 in an expanded state within the esophagus. As shown in Figure 5, the inner wall of the esophagus is folded in such a way that it forms multiple recesses 9.

[0036] The user inserts the catheter device 1 into the esophagus in its contracted state and expands the catheter device 1 near the target position for temperature measurement. Because the dimension T1 in the X direction is small relative to the recess 9 of the esophagus, the Y-direction tip of each arm 8 can enter the recess 9. Furthermore, because the dimension H1 in the Y direction is long relative to the esophagus, the arm 8 can contact the esophagus at both ends in the Y direction. If only the +Y end of the arm 8 enters the recess 9 and contacts the esophagus, there is a risk that the arm 8 will detach from the recess 9. On the other hand, if both ends in the Y direction are in contact with the esophagus, it is possible to prevent the arm 8 from detaching from the recess 9.

[0037] When the temperature sensor 4 is in contact with a living body, the temperature sensor 4 can directly obtain the temperature of the living body. When the temperature sensor 4 is not in contact with a living body, but the arm 8 is in contact with a living body, the temperature sensor 4 can obtain the temperature of the living body via the arm 8.

[0038] [Effects] The catheter device 1 according to Embodiment 1 can provide the following effects.

[0039] The catheter device 1 extends along the Z direction (axial direction) between the tip portions 80A, 80B, 80C, 80D and the end portions 81A, 81B, 81C, 81D, and includes a plurality of arms 8 arranged in the X direction (first direction) intersecting the Z direction. The catheter device 1 also includes temperature sensors 4 respectively disposed on each of the plurality of arms 8. When viewed from the Z direction, the plurality of arms 8 are deformable between a contracted state in which the interval between the arms 8 at both ends in the X direction is an interval D2 (first interval) and an expanded state in which the interval is an interval D1 (second interval) larger than the interval D2. When viewed in cross-section from the Z direction, in each of the plurality of arms 8, the dimension H1 (second dimension) in the Y direction (second direction) intersecting the X direction is larger than the dimension T1 (first dimension) in the X direction.

[0040] With such a configuration, since the dimension T1 in the X direction is small, the arm 8 can easily enter a structure in the living body such as a recess in the esophagus. Also, since the dimension H1 in the Y direction is large, the arms 8 can contact the living body at both ends in the Y direction and are biased into the recess, so that the arms 8 can be prevented from detaching from the recess. Therefore, the catheter device 1 can realize more accurate temperature measurement.

[0041] In the catheter device 1, when viewed in cross-section from the Z direction, the plurality of arms 8 each extend in the Y direction and have a pair of opposing side surfaces P1, P2 (side surfaces).

[0042] With such a configuration, when the temperature sensor 4 is provided on the side surfaces P1, P2, it becomes easy to provide the temperature sensor 4.

[0043] In the catheter device 1, the temperature sensor 4 is disposed on the side surface P1 of the plurality of arms 8.

[0044] With such a configuration, it becomes easy to provide the temperature sensor 4.

[0045] In the catheter device 1, the dimension H1 is larger than 10 times the dimension T1.

[0046] With such a configuration, if the dimension H1 is larger than the dimension T1, an increase in the amount of heat dissipation in the Z direction can be suppressed, and a decrease in the temperature detected by the temperature sensor 4 can be suppressed. Therefore, the temperature detection by the temperature sensor 4 becomes more accurate.

[0047] In the catheter device 1, the plurality of arms 8 are four arms 8A, 8B, 8C, and 8D arranged in the X direction.

[0048] With such a configuration, by increasing the number of arms 8, the temperature can be measured over a wider range.

[0049] In the catheter device 1, when viewed from the Z direction, each of the two outer arms 8A and 8D among the four arms 8A, 8B, 8C, and 8D has an outer surface P1 facing outward, and the temperature sensor 4 is disposed on the outer surface P1.

[0050] With such a configuration, interference with the other arms 8B and 8C can be suppressed, so that the temperature sensor 4 can be prevented from peeling off from the arms 8A and 8D.

[0051] The catheter device 1 further includes a cylindrical sheath 6 capable of accommodating the plurality of arms 8 in a contracted state, and the plurality of arms 8 expand when they are extended from the sheath 6.

[0052] With such a configuration, it is easy to expand the plurality of arms 8 to an expanded state.

[0053] The catheter device 1 further includes a cap 10 (member) connected to the Z-direction ends of the plurality of arms 8 and at least partially protruding from the sheath 6.

[0054] With such a configuration, by pulling the cap 10 in the Z direction and pulling it out from the sheath 6, it is easy to expand the plurality of arms 8 to an expanded state.

[0055] The catheter device 1 further includes a flexible substrate 5 that electrically connects the temperature sensor 4 to each of the plurality of arms 8.

[0056] With this configuration, the heat conducted to the arm 8 via the flexible substrate 5 can be transmitted to the temperature sensor 4.

[0057] This disclosure is not limited to the embodiments described above, and can be implemented in various other forms.

[0058] In this embodiment, an example has been described in which multiple temperature sensors 4 are provided at equal intervals on each arm 8, but the embodiment is not limited to this. Any number of temperature sensors 4 may be provided on each arm 8, and the number of temperature sensors 4 provided on each arm 8 may differ from that of the others. In addition, one or more temperature sensors 4 on each arm 8 may be arranged in any way.

[0059] In this embodiment, an example in which multiple temperature sensors 4 are arranged on the outer surface P1 has been described, but the embodiment is not limited to this. Multiple temperature sensors 4 may also be arranged on the inner surface P2. For example, in arms 8A and 8D, the temperature sensors 4 may be arranged on the outer surface P1, and in arms 8B and 8C, the temperature sensors 4 may be arranged on the inner surface P2.

[0060] In this embodiment, an example has been described in which each arm 8 has a common dimension H1 in the Y direction and a common dimension T1 in the X direction, but the embodiment is not limited to this. The dimensions H1 and T1 of each arm 8 may be different from each other. On the other hand, as shown in Modification Example 1 described later, the dimension H1 of the outer arms 8A and 8D may be smaller than the dimension H1 of the inner arms 8C and 8B.

[0061] [Modified Examples] Modified examples are described below. In the modified examples, components that are the same as or equivalent to those in Embodiment 1 are denoted by the same reference numerals and described accordingly, and descriptions that are redundant with Embodiment 1 are omitted.

[0062] <Modification 1> Figure 6 is a schematic cross-sectional view of the expanded catheter device 101 of Modification 1. The catheter device 101 differs from the catheter device 1 of Embodiment 1 in that it has arms 18A, 18B, 18C, and 18D instead of arms 8A, 8B, 8C, and 8D.

[0063] As shown in Figure 6, the dimensions H11 and H12 in the Y direction differ between arms 18A and 18D and arms 18B and 18C. Specifically, the dimension H11 in the Y direction of arms 18A and 18D, which are located outward from the center C, is smaller than the dimension H12 in the Y direction of arms 18B and 18C, which are located inward from the center C.

[0064] The configuration of Modified Example 1 makes it easier to house the arm member 102 inside the cylindrical sheath 6.

[0065] Furthermore, the Y-direction dimension H11 of arms 18A and 18D may be greater than the Y-direction dimension H12 of arms 18B and 18C.

[0066] <Modification 2> Figure 7 is a schematic cross-sectional view of the expanded catheter device 201 of Modification 2. The catheter device 101 differs from the catheter device 1 of Embodiment 1 in that it has arms 28A, 28B, 28C, and 28D instead of arms 8A, 8B, 8C, and 8D.

[0067] When extended, arms 28B and 28D extend in the Z direction in a twisted state. Therefore, as shown in Figure 7, in a predetermined cross-section viewed from the Z direction, arms 28B and 28D are inclined with respect to the Y direction.

[0068] Furthermore, arms 28B and 28D only need to be twisted in the extended state, and may or may not be twisted in the retracted state.

[0069] Furthermore, it is sufficient that at least one of the arms 28A, 28B, 28C, and 28D is twisted.

[0070] <Modification 3> Figure 8 is a schematic cross-sectional view of the expanded catheter device 301 of Modification 3. The catheter device 301 differs from the catheter device 1 of Embodiment 1 in that it has arms 38A, 38B, 38C, and 38D instead of arms 8A, 8B, 8C, and 8D.

[0071] As shown in Figure 8, the arms 38A, 38B, 38C, and 38D have projections 30 that protrude in the X or Y direction. Specifically, the projections 30 only need to protrude in a direction having an X component or a Y component. The projections 30 can have any shape and dimensions. The projections 30 may be rigid or flexible.

[0072] By providing the projection 30, the arms 38A, 38B, 38C, and 38D can more easily come into contact with the inner wall of a living body such as the esophagus, allowing the catheter device 301 to measure a wider range of temperatures.

[0073] <Modification 4> Figure 9 is a schematic perspective view of the expanded catheter device 401 of Modification 4. The catheter device 401 differs from the catheter device 1 of Embodiment 1 in that it has a shaft 40.

[0074] As shown in Figure 9, the shaft 40 is a member that extends in the -Z direction from the +Z end of the arm member 2 between the arm 8B and the arm 8C. The shaft 40 has a length such that it protrudes from the sheath 6 in the -Z direction when the arm member 2 is housed in the sheath 6.

[0075] The arm member 2 can move from a retracted state to an extended state by the user pulling the shaft 40 protruding from the sheath 6. Furthermore, the force of extension and contraction acting on the arm member 2 can be adjusted by adjusting the force of pulling and pushing the shaft 40.

[0076] (Embodiment 2) The catheter device 501 according to Embodiment 2 of the present disclosure will now be described. In Embodiment 2, the differences from Embodiment 1 will be mainly described, and explanations that overlap with Embodiment 1 will be omitted. In Embodiment 2, components that are the same as or equivalent to those in Embodiment 1 will be denoted by the same reference numerals.

[0077] Figure 10 is a schematic perspective view of the expanded catheter device 501 according to Embodiment 2 of this disclosure.

[0078] In Embodiment 2, the catheter device 501 differs from the catheter device 1 according to Embodiment 1 in the structure of the arm member 502. The arm member 502 may be formed from the same material as the arm member 2 according to Embodiment 1 (for example, Ni-Ti alloy).

[0079] As shown in Figure 10, the arm member 502 has a plurality of arms 58A, 58B, 58C, and 58D. The arms 58A, 58B, 58C, and 58D have a continuous configuration. Specifically, among the arms 58A, 58B, 58C, and 58D, adjacent arms are continuous at their ends in the Z direction. Arms 58A, 58B and arms 58C, 58D are continuous at their -Z side end portions 60A, 60B, 60C, and 60D, and arms 58B and 58C are continuous at their +Z side end portions 61B, 61C. The +Z side end portions 61B, 61C of arms 58B and 58C are sandwiched and bundled between arms 58A and 58D. Note that the +Z side end portions 61B, 61C of arms 58B and 58C may be provided separately from arms 58A and 58D.

[0080] In arms 58A and 58D, the temperature sensor 4 is positioned on the outer surface P1, and in arms 58B and 58C, the temperature sensor 4 is positioned on the inner surface P2.

[0081] This configuration reduces the number of constituent parts, simplifying the structure of the arm member 502 and making it easier to manufacture.

[0082] In this specification, terms such as "first," "second," etc., are used solely for illustrative purposes and should not be understood as expressing or implying relative importance or ranking of technical features. Features designated as "first" and "second" express or imply that they include one or more such features.

[0083] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various variations and modifications will be obvious to those skilled in the art. Such variations and modifications should be understood to be included within the scope of this disclosure as defined by the accompanying claims.

[0084] The catheter device of this disclosure is useful for inserting into a patient's body to measure temperature.

[0085] 1. Catheter device 2. Arm component 4. Temperature sensor 5. Flexible circuit board 6. Sheath 8. Arm

Claims

1. A catheter device comprising: a plurality of arms extending axially between a tip and a terminal and aligned in a first direction intersecting the axial direction; and a temperature sensor disposed on each of the plurality of arms, wherein, when viewed from the axial direction, the plurality of arms are deformable between a contracted state in which the distance between the arms at both ends in the first direction is a first distance and an expanded state in which the distance is a second distance greater than the first distance, and when viewed in cross-section from the axial direction, in each of the plurality of arms, the second dimension in the second direction intersecting the first direction is greater than the first dimension in the first direction.

2. The catheter device according to claim 1, wherein, when viewed in cross-section from the axial direction, each of the plurality of arms has a pair of opposing sides extending in the second direction.

3. The catheter device according to claim 2, wherein the temperature sensor is arranged on the side surface of the plurality of arms.

4. The catheter device according to any one of claims 1 to 3, wherein the second dimension is greater than 10 times the first dimension.

5. The catheter device according to any one of claims 1 to 4, wherein the plurality of arms are four arms aligned in the first direction.

6. The catheter device according to claim 5, wherein the second dimension of the two outer arms of the four arms is smaller than the second dimension of the two inner arms.

7. The catheter device according to claim 5 or 6, wherein, when viewed from the axial direction, each of the two outer arms of the four arms has an outer surface facing outward, and the temperature sensor is disposed on the outer surface.

8. The catheter device according to any one of claims 1 to 7, wherein, when viewed from the axial direction, at least one of the plurality of arms is inclined with respect to the second direction in the extended state.

9. The catheter device according to claim 2, wherein, when viewed from the axial direction, the plurality of arms have projections protruding from the side in the first or second direction.

10. The catheter device according to any one of claims 1 to 9, further comprising a cylindrical sheath capable of accommodating the plurality of arms in the retracted state, wherein the plurality of arms are in the extended state when extended from the sheath.

11. The catheter device according to claim 10, further comprising a member connected to the axial ends of the plurality of arms and at least partially protruding from the sheath.

12. The catheter device according to any one of claims 1 to 11, further comprising a flexible substrate for electrically connecting the temperature sensor to each of the plurality of arms.

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