US2005251265A1PendingUtilityA1

Trapezium implant for thumb and method

39
Individually held — no corporate assignee on recordPriority: May 7, 2004Filed: May 7, 2004Published: Nov 10, 2005
Est. expiryMay 7, 2024(expired)· nominal 20-yr term from priority
Inventors:James H. CalandruccioMark T. JobeChad Patteron
A61F 2002/30205A61F 2002/4276A61F 2/08A61F 2230/0067A61F 2002/30822A61F 2002/30069A61F 2/0811A61F 2/4261A61F 2/4241A61F 2002/4258
39
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Claims

Abstract

An implant for the trapezium of the thumb carpometacarpal (CMC) joint comprising an integral elastomeric member configured to include a body portion having a tapered neck, having extending from one end thereof an elongated, longitudinally extending tapered portion adapted to be embedded into a reamed out-channel in the thumb metacarpal bone. After implantation, in the preferred embodiment of the method according to the invention, a segment of a nearby tendon, for example, the APL or FCR tendons, may be wrapped around the tapered neck of the implant to secure it in position, thereby forming a reinforced structure to inhibit dislocation of the prosthesis. However, in other methods, various other securing elements, including, but not limited to acellular matrices, may be used to retain the implant in position.

Claims

exact text as granted — not AI-modified
1 . An implant for the trapezium of the thumb carpometacarpal joint comprising an integral, elastomeric member including a body portion having: 
 an elongated, longitudinally extending tapered portion extending from one end of said body portion; and    a tapered neck.    
   
   
       2 . The implant of  claim 1 , wherein said elongated, longitudinally extending tapered portion is annular in cross section.  
   
   
       3 . The implant of  claim 1 , wherein said elongated, longitudinally extending tapered portion has a substantially constant taper.  
   
   
       4 . The implant of  claim 3 , wherein said elongated, longitudinally extending tapered portion includes a blunt end.  
   
   
       5 . The implant of  claim 1 , wherein said substantially constant taper is at least in the area of said blunt end.  
   
   
       6 . The implant of  claim 1 , wherein said body portion has tapered portions separated by said tapered neck, wherein said tapered portions have rounded rims.  
   
   
       7 . The implant of  claim 6 , wherein said tapered neck has a circular cross-section.  
   
   
       8 . The implant of  claim 1 , wherein said elastomeric is a silicone rubber.  
   
   
       9 . The implant of  claim 1 , wherein the tapered portion is approximately three times longer than said body portion.  
   
   
       10 . A method of reconstructing the carpometacarpal (CMC) joint of a thumb, including the steps of: 
 a) implanting an implant having an elongated tapered portion and a tapered neck into said joint;    b) stripping away a portion of tendon, leaving the distal attachment intact adjacent the implant;    c) wrapping said split tendon around the tapered neck of the implant to a point intersecting the remaining tendon at the palm side of the hand, and suturing said split tendon to the remaining tendon.    
   
   
       11 . The method of  claim 10 , wherein said step of stripping away a portion of tendon further comprises stripping away a portion of flexor carpi radialis (FCR) tendon.  
   
   
       12 . The method of  claim 10 , wherein said step of stripping away a portion of tendon further comprises stripping away a portion of abductor pollicis longus (APL) tendon.  
   
   
       13 . A method of reconstructing the carpometacarpal (CMC) joint of a thumb, including the steps of: 
 a) implanting an implant having an elongated tapered portion and a tapered neck into said joint;    b) providing a securing element;    c) attaching said securing element to a tendon;    d) wrapping said securing element around the tapered neck of the implant to a point intersecting said tendon at the palm side of the hand, and attaching said securing element to said tendon.    
   
   
       14 . The method of  claim 13 , wherein said step of providing a securing element comprises providing a tendon.  
   
   
       15 . The method according to  claim 14 , wherein said step of providing a tendon comprises providing a strip of split APL or FCR tendon.  
   
   
       16 . The method according to  claim 13 , wherein said step of providing a securing element comprises providing a tendon substitute.  
   
   
       17 . The method according to  claim 16 , wherein said step of providing a tendon substitute comprises providing an acellular matrix.

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