Transurethral needle ablation system with automatic needle retraction
First Claim
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1. A transurethral ablation device, comprising:
- a transurethral catheter having a proximal end and a distal end;
at least one ablation needle deployable from the distal end of the catheter to penetrate prostate tissue of a patient and to deliver ablation energy to the prostate tissue; and
an automatic needle retraction mechanism to automatically fully retract the needles within the catheter,wherein the automatic needle retraction mechanism further comprises;
a retraction button; and
a lever arm having a proximal end aligned to engage a retraction button and having a ratchet engagement tooth disposed at a distal end, and wherein actuation of the retraction button moves the lever arm to release the ratchet engagement tooth from a selected ratchet position.
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Abstract
A one-piece, single-use disposable device for transurethral needle ablation (TUNA) of prostate tissue to alleviate BPH is disclosed. The device may include a flexible catheter tip including a rigid core and a flexible tip. The device may also include a single use lockout to help ensure that the device is used to perform only one ablation procedure on a single patient. The device may further include a simplified needle deployment mechanism and/or an automatic needle retraction mechanism.
120 Citations
16 Claims
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1. A transurethral ablation device, comprising:
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a transurethral catheter having a proximal end and a distal end; at least one ablation needle deployable from the distal end of the catheter to penetrate prostate tissue of a patient and to deliver ablation energy to the prostate tissue; and an automatic needle retraction mechanism to automatically fully retract the needles within the catheter, wherein the automatic needle retraction mechanism further comprises; a retraction button; and a lever arm having a proximal end aligned to engage a retraction button and having a ratchet engagement tooth disposed at a distal end, and wherein actuation of the retraction button moves the lever arm to release the ratchet engagement tooth from a selected ratchet position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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deploying at least one ablation needle from a distal end of a transurethral catheter to penetrate prostate tissue of a patient; delivering ablation energy to the prostate tissue via the needles; actuating a physician actuatable retraction button; and in response to actuating the physician actuatable retraction button, moving a lever arm to release a ratchet engagement tooth from a selected ratchet position to automatically fully retract the needles within the catheter. - View Dependent Claims (13, 14, 15)
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16. A method comprising:
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deploying at least one ablation needle from a distal end of a transurethral catheter; actuating an automatic needle refraction mechanism; in response to actuating the automatic need retraction mechanism, releasing a ratchet engagement tooth from a selected ratchet position; and applying a retraction force to automatically fully retract the needles within the catheter upon release of the ratchet engagement tooth.
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Specification