EP0465449A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tissue dissipative recanalization catheter.
Assignee: Boston Scientific Corp Northwest Technology Center Inc
•
Filing: 1991-06-28
•
Granted: —
•
Expires: 2011-06-28
Abstract
Abstract The invention relates to an RF-activated guidewire (26,30) to electrosurgically pass through occlusive material to allow the use of other vescular therapeutic devices to traverse the guidewire through the occlusive material. More particularly, the invention relates to a catheter system for penetrating occulsive tissue in an arterial lumen, comprising: a substantially tubular sheath means (34); an electrically conductive guidewire (26), said guidewire having an electrosurgical tip (30) and passing through said sheath means; and a voltage generating means (12) electrically connected to said electrically conductive guidewire to activate said electrosurgical tip.
Inventors
- 👤 David C. Auth
- 👤 Thomas J. Clement
- 👤 Michael J. Intlekofer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 20:44
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1492; A61B17/00; A61B17/22; A61B17/00234; A61B2017/00292; A61B2017/22038; A61B2017/22042; A61B2017/22044; A61B2018/00053; A61B2018/00184; A61B2018/00196; A61M; A61M2205/00; A61M2205/32
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
50 words
A catheter system for penetrating occlusive tissue in an arterial lumen, comprising: a substantially tubular sheath means; an electrically conductive guidewire, said guidewire having an electrosurgical tip and passing through said sheath means; and a voltage generating means electrically connected to said electrically conductive guidewire to activate said electrosurgical tip.
Claim 2
Dependent Claim
60 words
The catheter system of Claim 1, wherein said voltage generating means includes a first and a second terminal, said first terminal electrically connected to said guidewire, and said second terminal electrically connected to a ground plate for attachment to a patient, to create an electrical circuit comprised of said voltage generating means, said guidewire, the patient, and said ground plate.
Claim 3
Dependent Claim
73 words
The catheter system of Claim 1, wherein said voltage generating means includes a first and a second terminal, said first terminal electrically connected to said guidewire, and said second terminal electrically connected to a power supply ground wire, to create an electrical circuit comprised of said voltage generating means, said guidewire, the patient, and said power supply ground wire wherein the patient and said power supply ground wire are connected via capacitive coupling.
Claim 4
Dependent Claim
16 words
The catheter system of Claim 1, wherein said voltage generating means generates an alternating current voltage.
Claim 5
Dependent Claim
19 words
The catheter system of Claim 4, wherein said alternating current voltage has a frequency in excess of 100 kilohertz.
Claim 6
Dependent Claim
18 words
The catheter system of Claim 4, wherein said alternating current voltage has a frequency in the radio-frequency range.
Claim 7
Dependent Claim
12 words
The catheter system of Claim 1, wherein said tip is a microball.
Claim 8
Dependent Claim
18 words
The catheter system of Claim 1, wherein said guidewire has an insulative coating proximally adjacent to said tip.
Claim 9
Dependent Claim
13 words
The catheter system of Claim 8, wherein said insulative coating is comprises polytetrafluoroethylene.
Claim 10
Dependent Claim
11 words
The catheter system of Claim 1, wherein said tip is radiopaque.
Claim 11
Dependent Claim
15 words
The catheter system of Claim 10, wherein said tip is comprised of a platinum alloy.
Claim 12
Dependent Claim
19 words
The catheter system of Claim 10, wherein said tip is comprised of electrically conducting, heat and corrosion resistant material.
Claim 13
Dependent Claim
30 words
The catheter system of Claim 1, wherein the proximal end of said sheath engages an adapter, said adapter including means for releasably securing said guidewire into a range of positions.
Claim 14
Dependent Claim
22 words
The catheter system of Claim 13, wherein the proximal end of said guidewire passes from said adapter into an insulated storage means.
Claim 15
Dependent Claim
20 words
The catheter system of Claim 13, wherein said means for releasably securing said guidewire includes a gland and gland nut.
Claim 16
Dependent Claim
25 words
The catheter system of Claim 13, wherein a Luer fitting on the proximal end of said sheath engages a reciprocal Luer fitting on said adapter.
Claim 17
Dependent Claim
18 words
The catheter system of Claim 13, wherein said adapter includes an injection port in communication with said sheath.
Claim 18
Dependent Claim
45 words
The catheter system of Claim 17, wherein said means for releasably securing said guidewire includes a gland and gland nut and wherein said adapter includes an insulated passage into which a proximal end of said pguidewire passes and a Luer fitting to engage said sheath.
Claim 19
Dependent Claim
24 words
The catheter system of Claim 1, wherein said voltage generating means generates an alternating current voltage with a frequency in excess of 100 kilohertz.
Claim 20
Dependent Claim
24 words
The catheter system of Claim 19, wherein said voltage generating means generates an alternating current voltage with a frequency substantially equal to 500 kilohertz.
Claim 21
Dependent Claim
22 words
The catheter system of Claim 19, wherein said alternating current voltage is amplitude modulated at a frequency of 50 to 200 hertz.
Claim 22
Dependent Claim
62 words
The catheter system of Claim 1, wherein said voltage generating means includes a first and a second terminal, said first terminal being electrically connected to said guidewire and said second terminal being electrically connected to a ground plate for attachment to a patient, to create an electrical circuit comprised of said voltage generating means, said guidewire, the patient, and said ground plate.
Claim 23
Dependent Claim
75 words
The catheter system of Claim 1, wherein said voltage generating means includes a first and a second terminal, said first terminal being electrically connected to said guidewire and said second terminal being electrically connected to a power supply ground wire, to create an electrical circuit comprised of said voltage generating means, said guidewire, the patient, and said power supply ground wire, wherein the patient and said power supply ground wire are connected via capacitive coupling.
Claim 24
Dependent Claim
21 words
The catheter system of Claim 1, wherein said voltage generating means operates responsive to a switch means for a predetermined period.
Claim 25
Dependent Claim
14 words
The catheter system of Claim 24, wherein said predetermined period is approximately 0.2 seconds.
Claim 26
Dependent Claim
14 words
The catheter system of Claim 24, wherein said switch means comprises a foot pedal.
Claim 27
Independent Claim
117 words
A method for penetrating occlusive tissue in an arterial lumen, which comprises the steps of: (a) advancing a guide catheter having proximal and distal ends through an arterial lumen to a position where the distal end of the guide catheter is proximally adjacent to an occlusion; (b) advancing an electrically conductive guidewire having proximal and distal ends and an electrosurgical tip at its distal end, distally through said guide catheter to a position where the electrosurgical tip of the guidewire is proximally adjacent to the occlusion; (c) causing electrical current to flow distally through said guidewire to the electrosurgical tip; and (d) advancing the electrosurgical tip distally into and through the occlusion to create a passageway therethrough.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.