US 2009/0221998 A1 · ANCHORED RF ABLATION DEVICE FOR THE DESTRUCTION OF TISSUE MASSES

Abstract

An anchoring member which comprises a support structure and at least one anchor secured to the anchoring member is disclosed. An anchor deflection member is disposed generally externally to and at least partially surrounding and extending along the perimeter of the anchoring member. The anchor deflection member supports the anchoring member for sliding longitudinal movement in directions which result in advancement and retraction of a point on the anchor. The anchor deflection member defines a guide surface positioned on the inside of the anchor deflection member. The guide surface extends longitudinally, and it is configured and dimensioned to slidingly guide the cylindrical anchoring member. A deflection lip is positioned relatively inwardly with respect to the guide surface. The deflection lip is positioned to outwardly deflect the point of the anchor as the anchor is advanced from a position removed from the deflection lip toward the deflection lip into contact with the deflection lip and beyond the deflection lip.

Claims20

Dependent claims

An anchoring mechanism for an ablation element, comprising:

(a) an anchoring member comprising a support structure and at least one anchor secured to said anchoring member;
and
(b) an anchor deflection member disposed generally externally to and at least partially surrounding and extending along the perimeter of said anchoring member, said anchor deflection member supporting said anchoring member for sliding longitudinal movement in directions which result in advancement and retraction of a point on said anchor, said anchor deflection member defining:
(i) a guide surface positioned on the inside of said anchor deflection member, said guide surface extending longitudinally, and configured and dimensioned to slidingly guide said cylindrical anchoring member;
and
(ii) a deflection lip positioned relatively inwardly with respect to said guide surface, said deflection lip being positioned to outwardly deflect the point of said anchor as said anchor is advanced from a position removed from said deflection lip toward said deflection lip into contact with said deflection lip and beyond said deflection lip.

3 more elements

An ablation device, comprising:

(a) an elongated cannula having a proximal end and a distal end, said cannula defining an internal lumen within said cannula and a cannula axis;
(b) a plurality of conductors contained within said lumen, each of said conductors having a proximal end proximate the proximal end of said cannula, and a distal end proximate the distal end of said cannula;
(c) a plurality of ablation stylets each having a proximal end and a distal end, and each coupled at the respective proximal end of said stylet to the distal end of a respective conductor, said stylets comprising a deflectable material, said conductors together with their respective stylets being mounted for axial movement;
(d) a leading end member having a leading end proximate the distal end of said cannula;
(e) a stylet deflection surface positioned between said leading end and said proximal end of said cannula, said stylet deflection surface being configured and positioned to deflect, in response to axial movement of said stylets in a direction from said proximate end of said cannula to said distal end of said cannula, at least some of said stylets laterally with respect to said cannula axis in different directions along substantially straight paths, said paths defining an ablation volume, said anchor deflection member being positioned between said stylet deflection surface and the proximal end of said cannula;
and
(f) a stylet deflection counter surface facing said stylet deflection surface for imparting a bend to said stylet, said stylet deflection counter surface being configured so that points on said stylet deflection counter surface which are in facing relationship to points on curving portions of said stylets are oriented at angles which are 15° or less with respect to each other.

4 more elements

An ablation device, comprising:

(a) an elongated cannula having a proximal end and a distal end, said cannula defining an internal lumen within said cannula and a cannula axis;
(b) a plurality of conductors contained within said lumen, each of said conductors having a proximal end proximate the proximal end of said cannula, and a distal end proximate the distal end of said cannula;
(c) a plurality of ablation stylets each having a proximal end and a distal end, and each coupled at the respective proximal end of said stylet to the distal end of a respective conductor, said stylets comprising a deflectable material, said conductors together with their respective stylets being mounted for axial movement;
(d) a fluted member for receiving said the ablation stylets, said fluted member being secured to said ablation stylets by a securement member;
(e) a leading end member having a leading end proximate the distal end of said cannula;
(f) a stylet deflection surface positioned between said leading end and said proximal end of said cannula, said stylet deflection surface being configured and positioned to deflect, in response to axial movement of said stylets in a direction from said proximate end of said cannula to said distal end of said cannula, at least some of said stylets laterally with respect to said cannula axis in different directions along substantially straight paths, said paths defining an ablation volume, said anchor deflection member being positioned between said stylet deflection surface and the proximal end of said cannula;
and
(f) a stylet deflection counter surface facing said stylet deflection surface for imparting a bend to said stylet.

5 more elements

Dependencies are inferred from the claim text.

Anchored rf ablation device for the destruction of tissue masses

Life of this patent

Anchored rf ablation device for the destruction of tissue masses

Life of this patent

Abstract

Claims20