Lasing device

• US 5,807,383 A
• Filed: 10/04/1996
• Issued: 09/15/1998
• Est. Priority Date: 05/13/1996
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Shikhman, Oleg, Pacala, Thomas J., Correia, James, Kolesa, Michael S., Thompson, Barton C.
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US08/720,934
• Time in Patent Office: 711 Days
• Field of Search: 606/10, 606/11, 606/12, 606/14, 606/15, 606/16, 606/17
• US Class Current: 606/7
• CPC Class Codes: A61B 18/24 with a catheter A61B18/26, A61B18/28 take precedence
• CPC Class Codes: A61B 2017/00181 Means for setting or varying the pulse energy
• CPC Class Codes: A61B 2017/00247 Making holes in the wall of the heart, e.g. laser Myocardial revascularization
• CPC Class Codes: A61B 2017/00703 correcting for movement of heart, e.g. ECG-triggered
• CPC Class Codes: A61B 2017/22074 the instrument being only slidable in a channel, e.g. advancing optical fibre through a channel
• CPC Class Codes: A61B 2018/00392 Transmyocardial revascularisation

Abstract

A controlled advancement laser ablation device is provided for precise ablation of body matter. The laser ablation device includes a laser energy transmission mechanism such as, e.g. a fiber optic fiber mounted for controlled translational longitudinal movement relative to a housing structure. A laser energy generator is optically connected to the laser energy transmission mechanism. A controlled advancement mechanism is provided in engagement with the laser energy transmission mechanism for advancing the mechanism through the housing structure at a controlled rated coordinated with the laser energy generator output to ablate body tissue. Controlled advancement mechanisms include constant and/or variable rate springs, motors, and other mechanisms which can be coordinated with the laser energy generator to advance the laser energy transmission mechanism as the targeted substance is ablated. The device is particularly suitable for use in transmyocardial revascularization (TMR) and angioplasty procedures.

Claims

1. A laser ablation device comprising:

a handle portion having proximal and distal openings;

a fiber advancing device having a stationary member and a movable member, the movable member being movable towards and away from the stationary member by a screw member that rotatably engages the movable member;

a flexible fiber casing having proximal and distal ends, the distal end being rotatably secured to a proximal end of the handle portion and the proximal end being secured to the stationary member of the fiber advancing device;

at least one flexible optical fiber having proximal and distal ends, the distal end being extendible through the handle portion and a portion of the fiber defined between the proximal and distal ends being secured to the movable member of the fiber advancing device; and

a laser energy generator optically connected to the proximal end of the at least one optical fiber.

2. A laser device according to claim 1, wherein the fiber casing is removably secured to the stationary member.

3. A laser device according to claim 1, wherein the laser fiber is removably secured to the movable member.