Treating fractures using one or both of an implant, such as an intramedullary nail, and a fastening assembly, such as a lag screw and compression screw assembly. The implant in some embodiments has a proximal section with a transverse aperture having a non-circular cross-section that may be shaped t
Treating fractures using one or both of an implant, such as an intramedullary nail, and a fastening assembly, such as a lag screw and compression screw assembly. The implant in some embodiments has a proximal section with a transverse aperture having a non-circular cross-section that may be shaped to selectively constrain the fastening assembly within the transverse aperture. Two or more components of the fastening assembly may be received to slide, in a controlled way, in the transverse aperture of the implant, and to cooperate to resist a force moment applied thereto. Without the presence of one of the components, such as the lag screw, another component, such as the compression screw may not resist a force moment applied thereto. In some implementations, an engaging member and a compression device of the fastening assembly are configured so that the compression device interacts with a portion of the implant and a portion of the engaging member to enable controlled movement between first and second bone fragments. This configuration is useful for, among other things, compressing a fracture.
대표청구항▼
1. An orthopaedic implant comprising: a first member; a second member;a nail having a long axis, the nail including an inner wall defining a through hole, the through hole having a longitudinal axis oriented transverse to the long axis, the inner wall, as viewed perpendicular to the longitudinal axi
1. An orthopaedic implant comprising: a first member; a second member;a nail having a long axis, the nail including an inner wall defining a through hole, the through hole having a longitudinal axis oriented transverse to the long axis, the inner wall, as viewed perpendicular to the longitudinal axis, comprising:a first cylindrical section having a partial circle cross section defined by an arc greater than 180 degrees , the arc having first and second ends which are spaced a distance apart, the first cylindrical section defining a first portion of the through hole; anda second U-shaped section having a pair of parallel walls and a semi-circular cylindrical section having an arc of 180 degrees, the semi-circular cylindrical section having a diameter measured between a first end location and a second diametrically opposed end location of the 180 degree arc, the pair of parallel walls extending from the first and second ends of the arc of the first cylindrical section to the first and second end locations of the semi-circular cylindrical section along a length, the pair of parallel walls constantly being spaced apart the same distance as the first and second ends of the arc of the first cylindrical section, the distance between the first and second ends of the arc of the first cylindrical section is the same as the diameter of the semi-circular cylindrical section the second U-shaped section defining a second portion of the through hole;wherein the first member is insertable through the first portion of the through hole and the second member is insertable through the second portion of the through hole, wherein the second member has a member diameter substantially the same as the diameter of the semi-circular cylindrical section such that without the presence of the first member in the first portion of the through hole, the second member can slide within the through hole from the second portion of the through hole and entirely into the first portion of the through hole, wherein the length of the pair of parallel walls is less than half the member diameter or half the diameter of the semi-circular cylindrical section. 2. The orthopaedic implant of claim 1, wherein the second U-shaped section defines a shoulder within the semi-circular cylindrical section. 3. The orthopaedic implant of claim 1, further comprising a bore extending in a direction of the long axis, the bore intersecting the through hole. 4. The orthopaedic implant of claim 3, wherein a head of the nail has a cross-section perpendicular to the long axis that is non-circular, and wherein the bore is non-concentric with the non-circular cross-section of the head of the nail. 5. The orthopaedic implant of claim 1, wherein the through hole is oriented about 110 degrees to about 150 degrees off the long axis of the nail. 6. A method of treating a bone fracture with an implant, the implant comprising an intramedullary nail having a long axis and a through hole, the through hole having a longitudinal axis oriented transverse to the long axis, the through hole, as viewed perpendicular to the longitudinal axis, comprising: a first cylindrical section having a partial circle cross section defined by an arc greater than 180 degrees, the arc having first and second ends which are spaced a distance apart, the first cylindrical section defining a first portion of the through hole; and a second U-shaped section having a pair of parallel walls and a semi-circular cylindrical section having an arc of 180 degrees, the semi-circular cylindrical section having a diameter measured between a first end location and a second diametrically opposed end location of the 180 degree arc, the pair of parallel walls extending from the first and second ends of the arc of the first cylindrical section to the first and second end locations of the semi-circular cylindrical section along a length, the pair of parallel walls constantly being spaced apart the same distance as the first and second ends of the arc of the first cylindrical section, the distance between the first and second ends of the arc of the first cylindrical section is the same as the diameter of the semi-circular cylindrical section, the second U-shaped section defining a second portion of the through hole; wherein the length of the pair of parallel walls is less than half the diameter of the semi-circular cylindrical section, the method comprising: inserting the intramedullary nail into a canal of a fractured bone, the long axis of the intramedullary nail generally being aligned with a long axis of the fractured bone;inserting a first member axially through the first cylindrical section of the through hole, through a first portion of bone, across the fracture, and into a second portion of bone, the first member being free only to slide axially within the first portion of the through hole by interaction with the first cylindrical section of the through hole of the intramedullary nail;aligning a channel formed on an exterior surface of the first member with the space between the first and second ends of the arc of the first cylindrical section of the first portion of the through hole; andinserting a second member axially through the second U-shaped portion of the through hole, through the first bone portion, across the fracture, and into the second bone portion, the second member engaging the channel of the first member and is operable to move the second bone portion towards the first bone portion to compress the fracture,wherein the second member has a member diameter substantially the same as the diameter of the semi-circular cylindrical section such that without the presence of the first member in the first cylindrical section of the through hole, the second member can slide within the through hole from the second U-shaped portion of the through hole and entirely into the first cylindrical section of the through hole.
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이 특허에 인용된 특허 (106)
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