Compound barb medical device and method

Abstract

A compound barb medical device is provided which includes an elongated body having at least one barb formed along the length of the body, the barb defining an inner surface with a first portion disposed at a first orientation relative to a longitudinal axis of the elongated body, and a second portion disposed at a second orientation relative to the longitudinal axis. Optionally, the barb defines a third portion disposed at a third orientation relative to the longitudinal axis. A method for forming a compound barb on a medical device is also provided.

1 . (canceled) 
     
     
         2 . A compound barb medical device comprising:
 an elongate body; and   at least one barb extending from the elongate body and defining an inner surface, the inner surface including:
 a first portion disposed at a first orientation relative to a longitudinal axis of the elongate body; 
 a second portion disposed at a second orientation relative to the longitudinal axis; and 
 a third portion disposed at a third orientation relative to the longitudinal axis. 
   
     
     
         3 . The compound barb medical device according to  claim 2 , wherein at least one of the first, second, or third portions is substantially linear. 
     
     
         4 . The compound barb medical device according to  claim 2 , wherein the first, second, and third portions are at first, second, and third angles relative to respective longitudinal axes of the elongate body. 
     
     
         5 . The compound barb medical device according to  claim 2 , wherein at least one of the first, second, or third portions is substantially non-linear. 
     
     
         6 . The compound barb medical device according to  claim 4 , wherein at least one of the first, second or third angle is about 0 degrees to about 90 degrees. 
     
     
         7 . The compound barb medical device according to  claim 2 , wherein at least one of the first, second, or third portions is arcuate. 
     
     
         8 . The compound barb medical device according to  claim 2 , wherein the medical device is selected from monofilament sutures, multifilament sutures, surgical fibers, anchors, slit sheets, ribbons, tapes, meshes, stents, scaffolds, pledgets, or vascular grafts. 
     
     
         9 . The compound barb medical device according to  claim 2 , wherein the medical device is a suture and a proximal end of the suture includes a loop. 
     
     
         10 . A compound barb medical device comprising:
 an elongate body, wherein the elongate body is a monofilament suture including an outer surface in direct contact with tissue; and   at least one barb extending from the elongate body and defining an inner surface, the inner surface including:
 a first portion disposed at a first orientation relative to a first longitudinal axis of the elongate body, wherein the first portion is disposed at a first angle from about 0 degrees to about 90 degrees relative to the first longitudinal axis of the elongate body; and 
 a second portion disposed at a second orientation relative to a second longitudinal axis of the elongate body, wherein the second portion is disposed at a second angle from about 0 degrees to about 90 degrees relative to the second longitudinal axis of the elongate body. 
   
     
     
         11 . The compound barb medical device according to  claim 10 , wherein the first angle is from about 30 degrees to about 40 degrees. 
     
     
         12 . The compound barb medical device according to  claim 10 , wherein the second angle is from about 1 degree to about 10 degrees. 
     
     
         13 . A compound barb medical device comprising an elongate body including a plurality of barbs formed along at least a portion of a length thereof, wherein at least one of the plurality of barbs has an inner surface having at least one inflection point. 
     
     
         14 . A method of forming a compound barb on a medical device, comprising:
 providing a medical device having a longitudinal axis; and   applying vibrational energy to a cutting element to form a compound barb on at least a portion of the medical device, wherein forming the compound barb includes:
 forming a first cut in the medical device, the first cut having a first ratio of cut depth to diameter of the medical device; and 
 forming a second cut in the medical device, the second cut having a second ratio of cut depth to diameter of the medical device different from the first ratio. 
   
     
     
         15 . The method according to  claim 14 , further comprising forming a third cut in the medical device, the third cut having a third ratio of cut depth to diameter of the medical device different from at least one of the first ratio or the second ratio. 
     
     
         16 . The method according to  claim 14 , wherein the first ratio is approximately 1% to about 40%. 
     
     
         17 . The method according to  claim 14 , wherein the second ratio is approximately 5% to about 50%. 
     
     
         18 . The method according to  claim 15 , wherein the third ratio is approximately 15% to about 50%. 
     
     
         19 . A medical device having compound barbs formed by the method of  claim 14 . 
     
     
         20 . A suture comprising the medical device of  claim 19 , the suture including a needle attached to at least one end. 
     
     
         21 . A method of forming a compound barb on a medical device, comprising:
 providing a medical device having a longitudinal axis and an elongate body; and   applying vibrational energy to a cutting element to form a compound barb on at least a portion of the medical device, wherein forming the compound barb includes:
 forming a first linear cut in the medical device to form a first portion formed from the elongate body at a first angle α of from 30 degrees to 50 degrees and a first ratio cut depth which is approximately 1% to about 40% of the elongate body; 
 forming a second linear cut in the medical device to form a second portion formed from the elongate body at a second angle β of approximately 5 degrees to about 40 degrees and a second ratio cut depth which is approximately 5% to about 50% of the elongate body, 
   wherein the first angle α is greater than the second angle β to provide the compound barb having the first portion disposed at a first orientation relative to the longitudinal axis of the elongate body and the second portion disposed at a second orientation relative to the longitudinal axis of the elongate body.   
     
     
         22 . The method according to  claim 21 , wherein the first ratio cut depth is about 10% to about 30% of the elongate body. 
     
     
         23 . The method according to  claim 21 , wherein the second ratio cut depth is about 15% to about 45% of the elongate body. 
     
     
         24 . The method according to  claim 21 , wherein the amount of time a blade is in contact with the medical device ranges from about 1 millisecond to about 5 seconds. 
     
     
         25 . A medical device having a compound barb formed by the method of  claim 21 . 
     
     
         26 . A suture comprising the medical device according to  claim 25 , the suture including a needle attached to at least one end.