High-frequency heating power device for catheter

• US 5,800,426 A
• Filed: 05/16/1996
• Issued: 09/01/1998
• Est. Priority Date: 05/19/1995
• Status: Expired due to Term

• Current Assignee: Kaneka Corporation
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho, Kaneka Medix Corporation (Kaneka Corporation)
• Inventors: Goto, Yasuhiro, Ogawa, Atsushi, Hirano, Shinichi, Taki, Waro, Sadato, Akiyo
• Primary Examiner(s): Bahr, Jennifer
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US08/648,882
• Time in Patent Office: 838 Days
• Field of Search: 606/28, 606/29, 606/32, 606/34, 606/35, 606/40, 606/41, 606/42, 606/191, 606/1, 606/108, 123/1, 123/12, 604/104
• US Class Current: 606/32
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00672 lower
• CPC Class Codes: A61B 2018/00678 upper
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/1273 including multiple generators in one device

Abstract

A high frequency heating power device for an implanted device comprises a switch circuit, an input/output circuit, a high-frequency signal generating circuit, and a check circuit. When a high frequency output circuit applies a high frequency measuring voltage between a guide wire and the body ground board, a voltage is detected which corresponds to the impedance of a circuit which is made up of lead wires, the guide wire, the patient'"'"'s body, and the body grounding board. It is determined by a discriminating circuit whether or not the voltage thus detected is in a predetermined allowable voltage range. The operator is informed of the discrimination by means of a display circuit and a buzzer circuit, so that he can determine the position of the end of the guide wire with respect to the end of the catheter with ease.

Claims

1. A high-frequency heating power device comprising:

a conductive leading member inserted into a catheter adapted to be inserted through a patient'"'"'s body;

a grounding plate adapted to be set in contact with the patient'"'"'s body;

a high-frequency heating power member for applying a high-frequency heating voltage to said conductive leading member through a lead wire to heat a tip portion of said conductive leading member, said high-frequency heating power member being electrically arranged between said conductive leading member and the grounding plate;

an impedance measuring for applying a high-frequency measuring voltage lower than said high-frequency heating voltage between said conductive leading member and said grounding plate, to measure an impedance of a circuit which is made up of said lead wire, said conductive leading member, said patient'"'"'s body, and said grounding plate; and

an implanted device connected through a joint member to the tip portion of said conductive leading member, said joint member capable of being fused by application of said high-frequency heating voltage.

2. The high-frequency heating power device as claimed in claim 1, further comprising:

comparison means for determining whether or not an impedance value measured by said impedance measuring member is in a predetermined allowable range, and for outputting a signal when said impedance value is out of said predetermined allowable range.

3. The high-frequency power device as claimed in claim 2, further comprising:

an informing member operated according to a signal provided by said comparison means.

4. The high-frequency heating power device of claim 1, wherein the joint member comprises a thermally fusible material.

5. The high-frequency heating power device of claim 4, wherein the joint member comprises polyvinyl alcohol (PVA).

6. A high-frequency heating power device comprising:

a conductive leading member inserted into a catheter adapted to be inserted through a patient'"'"'s body;

a grounding plate adapted to be set in contact with the patient'"'"'s body;

a high-frequency heating power member for applying a high-frequency heating voltage to said conductive leading member through a lead wire to heat a tip portion of said conductive leading member, said high-frequency heating power member being electrically arranged between said conductive leading member and the grounding plate;

an impedance measuring member for applying a high-frequency measuring voltage lower than said high-frequency heating voltage between said conductive leading member and said grounding plate, to measure an impedance of a circuit which is made up of said lead wire, said conductive leading member, said patient'"'"'s body, and said grounding plate; and

inhibiting means for inhibiting the application of said high-frequency heating voltage which is used for fusing a joint member, when an impedance value measured by said impedance measuring member is out of a predetermined allowable range.

7. The high-frequency heating power device as claimed in claim 6, further comprising:

comparison means for determining whether or not an impedance value measured by said impedance measuring member is in a predetermined allowable range, and for outputting a signal when said impedance value is out of said predetermined allowable range.

8. The high-frequency heating power device as claimed in claim 7, further comprising:

an informing member operated according to a signal provided by said comparison means.

9. The high-frequency heating power device as claimed in claim 6, further comprising:

an implanted device connected through a joint member to the tip portion of said conductive leading member, said joint member capable of being fused by application of said high-frequency heating voltage.

10. The high-frequency power device as claimed in claim 9, further comprising:

comparison means for determining whether or not an impedance value measured by said impedance measuring member is in said predetermined allowable range, and for outputting a signal when said impedance value is out of said predetermined allowable range.

11. The high-frequency power device as claimed in claim 10, further comprising:

an informing member operated according to a signal provided by said comparison means.

12. The high-frequency heating power device of claim 9, wherein the joint member comprises a thermally fusible material.

13. The high-frequency heating power device of claim 12, wherein the joint member comprises polyvinyl alcohol (PVA).