Abstract: A controlled advancement laser ablation device is provided for precise ablation of body matter. The laser ablation device includes a handle portion having proximal and distal openings and a fiber advancing device having a stationary member and a movable member. The movable member is movable towards and away from the stationary member. A fiber casing is included having proximal and distal ends. The distal end is secured to the proximal end of the handle portion and the proximal end is secured to the stationary member. At least one optical fiber is included having proximal and distal ends. The distal end is extendible through the handle portion and a portion of the fiber, defined between the proximal and distal ends, is secured to the movable member. A laser energy generator is optically connected to the proximal end of the optical fiber. The handle portion includes a self-biasing advancing mechanism.

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.