Method and apparatus for anastomosis including annular joining member
View Patent ↗Apparatus and methods for performing a surgical anastomotic procedure are disclosed herein. Apparatus according to the present disclosure include a tubular body having a distal end and a proximal end and defining a longitudinal axis, the tubular body including an expandable anchor provided near the distal end thereof and an expandable cuff provided near the distal end of the tubular body and proximal of the expandable anchor, and a joining member ( 200 ) configured and adapted to be received about the expandable cuff of the tubular body, the joining member having an annular body portion ( 202 ) including a pair of opposed terminal edges ( 204, 206 ). The joining member has a retracted position in which the pair of opposed terminal edges overlap by a predetermined amount and an expanded position in which the pair of opposed terminal edges overlap by an amount less than the predetermined amount.
1. A radially expandable joining member for joining body vessels, comprising:
an annular body portion defining a longitudinal axis, the annular body portion including a distal terminal edge, a proximal terminal edge and a first and a second side terminal edge, wherein each of the first and the second side terminal edges is longitudinally oriented;
a guide channel formed near the first side terminal edge of the annular body;
at least one annular array of openings formed in the annular body;
at least one locking tab including an outer surface extending tangentially from an outer surface of the annular body portion, and extending radially outward from the first side terminal edge, each locking tab being in registration with a respective array of openings formed in the annular body and receivable in the openings of the at least one annular array of openings, wherein the joining member has a first position wherein the annular body has a first diameter and the second side terminal edge overlaps the first side terminal edge such that the outer surface of the at least one locking tab lies against an inner surface of the annular body, and a second position wherein the annular body has a second diameter which is larger than the first diameter, wherein the outer surface of the at least one locking tab slides over and across the openings of the at least one array of openings to permit the annular body to move to the second position when a radially outward force is applied to the inner surface of the annular body portion, and wherein the at least one locking tab inhibits the annular body from returning to the first diameter when the body vessels apply a radially inward oriented constriction force about an outer surface of the annular body portion, by being received in an opening of the at least one array of openings ; and
a pair of guide rails extending radially inward from an inner surface of the annular body portion, at least one of the pair of guide rails being spaced a longitudinal distance from each of the proximal and distal terminal edges and extending circumferentially a substantial length of the at least one annular array of openings such that the at least one locking tab is slidably received between the pair of guide rails.
2. The joining member according to claim 1 , including two annular arrays of openings formed in the annular body and two tabs extending tangentially from the first side edge, wherein the two tabs are configured and dimensioned to be received, one each, within a respective opening formed in the annular body.
3. The joining member according to claim 2 , wherein the guide rails are formed, one each, along each side of the two annular arrays of openings formed in the annular body.
4. The joining member according to claim 1 , wherein the guide channel is defined by a pair of side walls extending radially inward from the distal end proximal terminal edges of the annular body.
5. The joining member according to claim 4 , wherein the guide channel is further defined by an end wall interconnecting the terminal ends of the pair of side walls.
6. The joining member according to claim 5 , further including a plurality of flanges extending radially outward directly from at least one of the distal and proximal terminal edges thereof.
7. A radially expandable joining member, comprising:
an annular body portion defining a longitudinal axis, the annular body portion including a distal terminal edge, a proximal terminal edge and a first and a second side terminal edge, wherein each of the first and the second side terminal edges is longitudinally oriented;
at least one annular array of openings formed in the annular body;
at least one locking tab extending both tangentially and radially beyond the first side terminal edge, each locking tab being in registration with a respective array of openings formed in the annular body and receivable in the openings of the at least one annular array of openings, wherein the joining member has a first position wherein the annular body has a first diameter and the second side terminal edge overlaps the first side terminal edge such that an outer surface of the at least one locking tab lies against an inner surface of the annular body, and a second position wherein the annular body has a second diameter which is larger than the first diameter, wherein the outer surface of the at least one locking tab slides over and across the openings of the at least one array of openings to permit the annular body to expand from the first diameter to the second diameter when a radially outward force is applied to the inner surface of the annular body portion, and wherein the at least one locking tab inhibits the annular body from returning to the first diameter, once expanded to the second diameter, by being received in an opening of the at least one array of openings; and
a pair of guide rails extending radially inward from an inner surface of the annular body portion, at least one of the pair of guide rails being spaced a longitudinal distance from each of the proximal and distal terminal edges and extending circumferentially a substantial length of the at least one annular array of openings such that the at least one locking tab is slidably received between the pair of guide rails.
8. The joining member according to claim 7 , wherein each of the openings of the at least one annular array of openings is defined by an angled wall such that an upper edge of the angled wall is closer to the second side terminal edge than a lower edge of the angled wall.
9. The joining member according to claim 7 , wherein the joining member is fabricated from a bio-absorbable material.
10. The joining member according to claim 7 , wherein the joining member is fabricated from a shape memory alloy.
11. The joining member according to claim 7 , wherein the joining member includes a plurality of projections formed along an outer surface of the annular body portion.