Cannula having an electrode

• US 4,922,910 A
• Filed: 09/07/1988
• Issued: 05/08/1990
• Est. Priority Date: 09/07/1987
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Kabushiki Kaisha Shinsangyokaihatsu
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Kabushiki Kaisha Shinsangyokaihatsu
• Inventors: Suzuki, Akira, Kanai, Naritoshi
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/241,276
• Time in Patent Office: 608 Days
• Field of Search: 128/642, 128/784-786, 128/419 P, 128/692, 604/21, 600/17, 623/25
• US Class Current: 600/374
• CPC Class Codes: A61B 5/283 Invasive
• CPC Class Codes: A61M 2205/33 Controlling, regulating or measuring
• CPC Class Codes: A61M 2205/3303 Using a biosensor
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/196 replacing the entire heart, e.g. total artificial hearts [TAH]
• CPC Class Codes: A61M 60/857 Implantable blood tubes

Abstract

A cannula has an electrode therein for detecting electrocardiographic signals. The electrode is located in the inner wall of the cannula and has anti-thrombus characteristics. The electrode comprises a composition of an anti-thrombus polyurethane powder and a carbon powder. This composition has electrically conductive and anti-thrombus characteristics. The electrode is located in a recess of the inner wall of the cannula. The electrode is connected to the outside through a wire conductor.

Claims

1. A cannula having an electrode comprising:

a tubular member comprised of an insulating-substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus, said tubular member having a flange adjacent said one end to prevent the separation of the cannula from the blood vessel,

electrode means for detecting an electrocardiographic signal secured in said tubular member on an inner wall of said tubular member and comprised of substances having anti-thrombus and electrically conductive characteristics; and

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member.

2. A cannula according to claim 1, wherein said electrode means is comprised of an anti-thrombus insulating substance and an electrically conductive substance.

3. A cannula according to claim 2, wherein said electrode means comprises two laminated parts which have different composition ratios of an anti-thrombus insulating substance and electrically conductive substance wherein one of said parts which includes less electrically conductive substance is thinner than the other part and is located in said inner wall of said tubular member.

4. A cannula according to claim 1, further comprising a recess located in said inner wall of said tubular member, wherein said electrode means is located in said recess of said tubular member.

5. A cannula according to claim 4, wherein said recess has a projection made of an anti-thrombus substance projecting into the interior of said tubular member about the circumference thereof.

6. A cannula according to claim 4, wherein said recess has a wider opening than the bottom thereof.

7. A cannula according to claim 1, wherein said electrical conductor means is a wire and said electrode means is located adjacent said one end of said tubular member with one end of said wire being connected to said electrode mans and the other end extending from a remote portion of said tubular member.

8. A cannula according to claim 7, wherein said wire is made of spiral construction in said inner wall of said tubular member.

9. A cannula having an electrode comprising:

a tubular member comprised of an insulating-substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus, said one end having a first inside diameter and said another end having a second inside diameter greater than said first inside diameter

electrode means for detecting an electrocardiographic signal secured in said tubular member on an inner wall of said tubular member and comprised of substances having anti-thrombus and electrically conductive characteristics; and

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member.

10. A cannula according to claim 9, wherein said electrode means is comprised of an anti-thrombus insulating substance and an electrically conductive substance.

11. A cannula according to claim 10, wherein said electrode means comprises two laminated parts which have different composition ratios of an anti-thrombus insulating substance and electrically conductive substance wherein one of said parts which includes less electrically conductive substance is thinner than the other part and is located in said inner wall of said tubular member.

12. A cannula according to claim 9, further comprising a recess located in said inner wall of said tubular member, wherein said electrode means is located in said recess of said tubular member.

13. A cannula according to claim 12, wherein said recess has a projection made of an anti-thrombus substance projecting into the interior of said tubular member about the circumference thereof.

14. A cannula according to claim 12, wherein said recess has a wider opening than the bottom thereof.

15. A cannula according to claim 9, wherein said electrical conductor means is a wire and said electrode means is located adjacent said one end of said tubular member with one end of said wire being connected to said electrode mans and the other end extending from a remote portion of said tubular member.

16. A cannula according to claim 15, wherein said wire is made of spiral construction in said inner wall of said tubular member.

17. A cannula having an electrode comprising:

a tubular member comprised of an insulating substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus;

electrode means for detecting an electrocardiographic signal secured in said tubular member on an inner wall of said tubular member;

said electrode means being comprised of two laminated parts having different composition ratios of anti-thrombus insulating substance and an electrically conductive substance wherein one of said parts which includes less electrically conductive substance is thinner than the other part and is located in said inner wall of said tubular member, and

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member.

18. A cannula having an electrode comprising:

a tubular member comprised of an insulating substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus;

electrode means for detecting an electrocardiographic signal secured in said tubular member on an inner wall of said tubular member and comprised of substances having anti-thrombus and electrically conductive characteristics,

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member; and

a recess located in said inner wall of said tubular member and having a projection made of an anti-thrombus substance projecting into the interior of said tubular member about the circumference thereof with said electrode means being located in said recess of said tubular member.

19. A cannula having an electrode comprising:

a tubular member comprised of an insulating substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus;

electrode means for detecting an electrocardiographic signal secured in said tubular member on an inner wall of said tubular member and comprised of substances having anti-thrombus and electrically conductive characteristics,

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member; and

a recess located in said inner wall of said tubular member with said electrode means being located in said recess of said tubular member, said recess having a wider opening than the bottom thereof.

20. A cannula-blood pipe combination having an electrode comprising:

a tubular member comprised of an insulating substance having one end which is adapted to be inserted in a blood vessel of a patient and another end adapted to be connected to a blood circulating apparatus;

an artificial blood pipe connected to said one end of said tubular member,

electrode means for detecting an electrocardiographic signal secured in said tubular member adjacent said one end thereof; and

electrical conductor means having one end secured to said electrode means for connecting said electrode means externally of said tubular member.