Anchor element for knotless fixing of tissue to a bone
View Patent ↗An anchor element serves for knotless fixing of a tissue to a bone by at least one suture threaded through the anchor element. A body of that anchor element has an outer surface with projections. A transverse bore is arranged in a distal end section of the body for receiving a threading passing therethrough. A clamp element serves for clamping the suture threaded transversely through the bore. The clamping element has a portion arranged within the body and is movable within the body towards that transverse bore.
1. An anchor system for knotless fixing of a tissue to a bone, said anchor system comprising
an anchor element comprising:
a body having an outer face,
projections projecting from said outer face for preventing removal of said anchor element when inserted in the bone,
a distal end section of said body being rounded,
a proximal end of said body defining a bearing surface,
a transverse bore arranged in said distal end section of said body, said transverse bore extending through said body, and adapted to receive at least one suture transversely through said body,
and an axial bore, said axial bore opening into said transverse bore and extending from the proximal end of said body up to said transverse bore, said axial bore having an inner thread;
said transverse bore and said axial bore being positioned perpendicular to one another;
an axially extending pin having an outer thread meshing with said inner thread and being housed axially movable in said axial bore, an outer diameter of said pin corresponding to an inner diameter of said axial bore, said pin, when turned in, adapted to move in a direction towards the transverse bore and into the latter, said pin having a distal end configured to clamp the at least one suture against a distal wall of said transverse bore, and said pin having a recess provided in a proximal end thereof; and
a driver device comprising:
a proximal end adapted to be manipulated by a user of the anchor system and a distal end engaging said anchor element,
the distal end of the driver device comprising a shoulder and a pin engagement member projecting distally from said shoulder, the shoulder of the driver device defining a bearing surface configured to mate with the bearing surface of said anchor element such that axial force exerted on the proximal end of the driver device is transmitted to the anchor element through the shoulder of the driver device, and
the pin engagement member of said driver device and the recess of said pin being configured so as to provide rotational engagement therebetween, while allowing for relative axial movement therebetween when said shoulder rests on said bearing surface of said anchor element, such that, when said shoulder rests on said bearing surface of said anchor element, rotation of the pin engagement member of said driver device causes rotation of said pin and, consequently, axial movement of said pin within the axial bore of said anchor element,
whereby the driver device is adapted to be used for both insertion of the anchor element into the bone and also clamping of the at least one suture inserted through the transverse bore.
2. The anchor system of claim 1 , wherein said distal end of said pin is rounded.
3. The anchor system of claim 2 , wherein opposite to said rounded distal end of said pin, a gentle hollow is provided in said transverse bore, said gentle hollow approximately corresponds to said rounded distal end of said pin.
4. The anchor system of claim 1 , wherein said pin is designed as a headless screw.
5. The anchor system of claim 1 , wherein the pin engagement member of said driver device and the recess of said pin are configured so as to provide direct engagement therebetween during said rotational engagement therebetween.
6. The anchor system of claim 1 , wherein the pin engagement member of said driver device and the recess of said pin are configured such that rotation of the pin engagement member of said driver device causes rotation of said pin within the axial bore and, consequently, axial movement of said pin within the axial bore of said anchor element.
7. An anchor system for knotless fixing of a tissue to a bone, said anchor system comprising:
an anchor element comprising:
a body having an outer face,
projections projecting from said outer face for preventing removal of said anchor element when inserted in the bone,
a distal end section of said body being rounded,
a proximal end of said body defining a bearing surface,
a transverse bore arranged in said distal end section of said body, said transverse bore extending through said body, and adapted to receive at least one suture transversely through said body,
and an axial bore, said axial bore opening into said transverse bore and extending from the proximal end of said body up to said transverse bore, said axial bore having an inner thread;
said transverse bore and said axial bore being positioned perpendicular to one another;
a clamping element having an outer thread meshing with said inner thread and being housed axially movable in said axial bore, an outer diameter of said clamping element corresponding to an inner diameter of said axial bore, said clamping element, when turned in, adapted to move in a direction towards the transverse bore and into the latter, said clamping element having a distal end configured to clamp the at least one suture against a distal wall of said transverse bore, and said clamping element having a recess provided in a proximal end thereof; and
a driver device comprising:
a proximal end adapted to be manipulated by a user of the anchor system and a distal end engaging said anchor element,
the distal end of the driver device comprising a shoulder and a clamping element engagement member projecting distally from said shoulder, the shoulder of the driver device defining a bearing surface configured to mate with the bearing surface of said anchor element such that axial force exerted on the proximal end of the driver device is transmitted to the anchor element through the shoulder of the driver device, and
the clamping element engagement member of said driver device and the recess of said clamping element being configured so as to provide rotational engagement therebetween, while allowing for relative axial movement therebetween when said shoulder rests on said bearing surface of said anchor element, such that, when said shoulder rests on said bearing surface of said anchor element, rotation of the clamping element engagement member of said driver device causes rotation of said clamping element and, consequently, axial movement of said clamping element within the axial bore of said anchor element,
whereby the driver device is adapted to be used for both insertion of the anchor element into the bone and also clamping of the at least one suture inserted through the transverse bore.
8. The anchor system of claim 7 , wherein the clamping element engagement member of said driver device and the recess of said clamping element are configured so as to provide direct engagement therebetween during said rotational engagement therebetween.
9. The anchor system of claim 7 , wherein the clamping element engagement member of said driver device and the recess of said clamping element are configured such that rotation of the clamping element engagement member of said driver device causes rotation of said clamping element within the axial bore and, consequently, axial movement of said clamping element within the axial bore of said anchor element.