Cardiac ablation instrument
First Claim
1. A hand held cardiac ablation instrument comprising:
- a light transmitting optical fiber having a proximal end and a distal end, the proximal end being adapted to receive ablative radiation from a radiation source; and
a light diffusing element having light scattering medium and being coupled to the distal end of the optical fiber and configured in a toroidal shape to emit an annular pattern of uniform radiation.
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Accused Products
Abstract
The present invention is directed to a hand held cardiac ablation instrument and methods for irradiating a target ablation site. The instrument can include at least one light transmitting optical fiber and a light diffusing element to create a circumferential or curvilinear lesion. A handle is provided for manual application. The handle can be substantially coaxial or otherwise aligned with the center of the circumferential housing. Light travelling through the light transmitting optical fiber or fibers is scattered in a circular pattern by the light diffusing element. The light diffusing element can include a scattering medium, a reflective end cap, and a reflective surface diametrically opposed to the target ablation site, that interact to provide a substantially uniform distribution of laser radiation throughout the circular target region.
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Citations
32 Claims
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1. A hand held cardiac ablation instrument comprising:
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a light transmitting optical fiber having a proximal end and a distal end, the proximal end being adapted to receive ablative radiation from a radiation source; and
a light diffusing element having light scattering medium and being coupled to the distal end of the optical fiber and configured in a toroidal shape to emit an annular pattern of uniform radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A hand held cardiac ablation instrument comprising:
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a slidably disposed light transmitting optical fiber;
a housing in the shape of an open toroidal loop having a first end adapted to receive the slidably disposed light transmitting optical fiber; and
at least one diffuser chamber coupled to the fiber within the housing. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of ablating cardiac tissue, comprising:
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positioning a device in proximity to a target region of cardiac tissue, the device having a light diffusing element coupled to a source of photoablative radiation and configured in a toroidal shape to emit an arcuate pattern of radiation;
applying the device to the target region to induce an curvilinear lesion;
moving the device to a second position;
reapplying the device to the target region to induce a second curvilinear lesion;
repeating the steps of positioning and applying until the lesions are joined together to create a composite circumferential lesion. - View Dependent Claims (31, 32)
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Specification