US2010174323A1PendingUtilityA1

Self-boring and self-tapping screw for osteosynthesis and compression

32
Individually held — no corporate assignee on recordPriority: Jul 5, 2002Filed: Mar 19, 2010Published: Jul 8, 2010
Est. expiryJul 5, 2022(expired)· nominal 20-yr term from priority
Inventors:Eric Stéphane FourcaultTheo Jan Maria KnevelsJean-Christophe Alain GietBertrand Xavier François Gauneau
Y10S606/916A61B 17/8635A61B 17/863A61B 17/864
32
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Claims

Abstract

The invention provides an osteosynthesis and compression screw that is self-boring and self-tapping for the purpose of coaptation of small bone fragments. The screw comprises: a proximal portion formed by a screw head provided with an outside thread; an intermediate portion having no thread; and a distal portion provided with an outside thread. Wherein: each of the screw head and the distal portion includes at least one groove, firstly extending over the entire axial length of its thread, and secondly being formed through each thread in such a manner to form tapping means; and the terminal zone of the distal portion is provided with preparation means for preparing a housing in the bone fragments for receiving the intermediate and distal portions of the screw.

Claims

exact text as granted — not AI-modified
1 . An osteosynthesis and compression screw for coaptation of small bone fragments, the screw being formed by a single longitudinal body having a longitudinal axis, and comprising:
 a proximal portion formed by a screw head provided with an outside thread, said proximal portion being of diameter greater than the diameter of the remainder of the screw;   an intermediate portion having no thread;   a distal portion provided with an outside thread;   at least one groove present in the distal portion, for performing tapping;   
       wherein:
 the groove present in the distal portion is of helical shape and extends over substantially the entire axial length of the thread that the distal portion is provided with, 
 the terminal zone of the distal portion is provided with preparation means for preparing a housing in the bone fragments for receiving the intermediate and distal portions of the screw, said preparation means comprising at least one tooth. 
 
     
     
         2 . A screw according to  claim 1 , wherein the longitudinal body comprises a groove present in the proximal portion. 
     
     
         3 . A screw according to  claim 2 , wherein the groove present in the proximal portion is of helical shape. 
     
     
         4 . A screw according to  claim 1  wherein the obliqueness of the helical groove present in the distal portion lies in the range 20° to 40°, and is preferably about 25°. 
     
     
         5 . A screw according to  claim 3  wherein the obliqueness of the helical groove present in the proximal portion lies in the range 20° to 40°, and is preferably about 25°. 
     
     
         6 . A screw according to  claim 2 , wherein the depth of each groove is constant. 
     
     
         7 . A screw according to  claim 2 , wherein the depth of each groove varies regularly from the start towards the finish of each groove. 
     
     
         8 . A screw according to  claim 7 , wherein the depth of each groove increases going towards the terminal zone of the screw. 
     
     
         9 . A screw according to  claim 8 , wherein the final portion of each groove penetrates into the thickness of the body of the screw. 
     
     
         10 . A screw according to  claim 1 , the screw being provided with a central longitudinal bore to form a hollow screw. 
     
     
         11 . A screw according to  claim 10 , wherein each junction between the groove present in the distal portion and the central bore includes a tooth forming the preparation means. 
     
     
         12 . A screw according to  claim 1  wherein the diameter of the proximal portion increases going towards the proximal extremity of the screw. 
     
     
         13 . A screw according to  claim 1  wherein the proximal portion extends axially over a length that is less than the length over which the distal portion extends axially. 
     
     
         14 . A screw according to  claim 1  wherein the groove present in the proximal portion is a longitudinal groove. 
     
     
         15 . A screw according to  claim 1  wherein the intermediate portion is in the form of a substantially cylindrical portion that is smooth and of constant diameter. 
     
     
         16 . A screw according to  claim 1  wherein the pitch of the thread of the proximal portion is shorter than the pitch of the thread of the distal portion. 
     
     
         17 . A screw according to  claim 1  wherein said tooth extends substantially axially. 
     
     
         18 . A screw according to  claim 1  for joining together small bone fragments of the phalanges of the toes or the fingers.

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