IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0358934
(2012-01-26)
|
등록번호 |
US-8337494
(2012-12-25)
|
우선권정보 |
SE-0501604-3 (2005-07-08) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Plasma Surgical Investments Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
152 |
초록
▼
A plasma-generating device comprising an anode, a plurality of intermediate electrodes, an insulator sleeve, and a cathode is disclosed. The plurality of the intermediate electrodes and the anode form a plasma channel. One of the intermediate electrodes forms a plasma chamber. The cathode has a tape
A plasma-generating device comprising an anode, a plurality of intermediate electrodes, an insulator sleeve, and a cathode is disclosed. The plurality of the intermediate electrodes and the anode form a plasma channel. One of the intermediate electrodes forms a plasma chamber. The cathode has a tapering portion that projects downstream the distal end of the insulator sleeve only partially. Also, the distal-most point of the cathode is located some distance away from the plasma channel inlet. Methods of surgical use of the plasma-generating device are also disclosed.
대표청구항
▼
1. A plasma-generating device comprising: a. an anode at a distal end of the device, the anode having a hole therethrough;b. a plurality of intermediate electrodes electrically insulated from each other and from the anode, each of the intermediate electrodes having a hole therethrough, wherein the h
1. A plasma-generating device comprising: a. an anode at a distal end of the device, the anode having a hole therethrough;b. a plurality of intermediate electrodes electrically insulated from each other and from the anode, each of the intermediate electrodes having a hole therethrough, wherein the holes in the intermediate electrodes and the hole in the anode form a hollow space having i. a first portion, which over a substantial length of this portion has a uniform first cross-sectional area, andii. a second portion, which over a substantial length of this portion has a uniform second cross-sectional area that is smaller than the first cross-sectional area, the second portion being downstream of the first portion;c. a cathode having a tapered distal portion narrowing toward a distal end of the cathode, a proximal end of the tapered portion being a base of the tapered portion, the tapered portion having a length being a distance from the base of the tapered portion to the distal end of the cathode; andd. an insulator sleeve extending along and surrounding only a portion of the cathode and having a distal end,wherein only a part of the tapered portion of the cathode projects beyond the distal end of the insulator sleeve into the first portion of the hollow space, andwherein a distal end of the cathode is located some distance away from a proximal end of the second portion of the hollow space. 2. The plasma-generating device of claim 1 further comprising an outer sleeve. 3. The plasma-generating device of claim 2, wherein the outer sleeve and the anode are parts of an integral structure. 4. The plasma-generating device of claim 1 further comprising a first insulator positioned between a pair of adjacent intermediate electrodes of the plurality of intermediate electrodes, and a second insulator positioned between a distal-most intermediate electrode of the plurality of intermediate electrodes and the anode. 5. The plasma-generating device of claim 1, wherein approximately half the length of the tapered portion of the cathode projects beyond the distal end of the insulator sleeve. 6. The plasma-generating device of claim 5, wherein a length by which the projecting tapered portion of the cathode projects beyond the distal end of the insulator sleeve is approximately equal to a largest cross-sectional diameter of the cathode at the base of the tapered portion. 7. The plasma-generating device of claim 1, wherein an outside surface of the cathode and an inside surface of the insulator sleeve form a gap. 8. The plasma-generating device of claim 7, wherein the first portion of the hollow space extends from the distal end of the insulator sleeve to the proximal end of the second portion of the hollow space. 9. The plasma-generating device of claim 7, wherein the gap is in communication with the first portion of the hollow space. 10. The plasma-generating device of claim 9, wherein the first and second portions of the hollow space are connected through a transitional third portion of the hollow space tapered toward the anode. 11. The plasma-generating device of claim 9, wherein a cross-sectional area of the gap at the base of the tapered portion of the cathode is equal to or greater than the second cross-sectional area. 12. The plasma-generating device of claim 11, wherein the length of the tapered portion of the cathode is greater than a largest cross-sectional diameter of the cathode at the base of the tapered portion. 13. The plasma-generating device of claim 12, wherein the length of the tapered portion of the cathode is greater than or equal to 1.5 times the largest cross-sectional diameter of the cathode at the base of the tapered portion. 14. The plasma-generating device of claim 10, wherein the first and third portions of the hollow space are formed by a proximal-most intermediate electrode of the plurality of intermediate electrodes. 15. The plasma-generating device of claim 14, wherein a part of the second portion of the hollow space is also formed by the proximal-most intermediate electrode. 16. The plasma-generating device of claim 15, wherein a part of the second portion of the hollow space is formed by at least two of the plurality of intermediate electrodes. 17. The plasma-generating device of claim 10, wherein a combined length of the first and third portions of the hollow space is approximately equal to the length of the tapered portion of the cathode. 18. The plasma-generating device of claim 17, wherein the combined length of the first and third portions of the hollow space is approximately equal to a largest cross-sectional diameter of the first portion of the hollow space. 19. The plasma-generating device of claim 1, wherein the tapered portion of the cathode is a cone. 20. The plasma-generating device of claim 1, wherein a first distance from the base of the tapered portion of the cathode to the distal end of the insulator sleeve is equal to or greater than a second distance from the distal end of the cathode to the proximal end of the second portion of the hollow space. 21. A plasma surgical instrument comprising the plasma-generating device of claim 1. 22. The plasma surgical instrument of claim 21 adapted for laparoscopic surgery. 23. The plasma surgical instrument of claim 22 having an outer cross-sectional width of under 10 mm. 24. The plasma surgical instrument of claim 23 having an outer cross-sectional width of under 5 mm. 25. A method of using the plasma surgical instrument of claim 21 comprising a step of discharging plasma from the distal end of the plasma surgical instrument on a biological tissue. 26. The method of claim 25 further comprising one or more steps of: cutting, vaporizing, and coagulating the biological tissue. 27. The method of claim 25, wherein the discharged plasma is substantially free of impurities. 28. The method of claim 25, wherein the biological tissue is one of liver, spleen, heart, brain, or kidney.
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