Threadform for medical implant closure
a technology for medical implants and threads, applied in the field of threads, can solve the problems of implant special problems, difficult to solve, and the surgeon installing the implants and the engineer designing the implants, and achieve the effects of reducing the likelihood of failure of the implant and the closure system during use, constant radius, and high torqu
Inactive Publication Date: 2011-03-17
JACKSON ROGER P
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Benefits of technology
The solution effectively locks rod members in place with high torque application while minimizing the risk of arm bending and weight increase, maintaining a lightweight and low-profile design, thus enhancing the reliability and usability of open-headed medical implants.
Problems solved by technology
Medical implants present a number of problems to both surgeons installing implants and to engineers designing them.
These are normally conflicting goals, and often difficult to resolve.
One particular type of implant presents special problems.
Unfortunately, closed head devices are very difficult to work with in actual surgery as the spine is curved and the rods are also curved in order to follow the spine.
Consequently, the more heads that the rod must pass through, the more difficult it is to thread it.
While the open headed devices are often necessary and often preferred for usage, there is a significant problem associated with them.
However, conventionally threaded plugs push the arms radially outward upon the application of a significant amount of torque which ends up bending the arms sufficiently to allow the threads to disengage and the closure to fail.
For example, the arms were significantly strengthened by increasing the width of the arms by many times. This had the unfortunate effect of substantially increasing the weight and the size of the implant, which was undesirable.
This additional structure has typically caused the locking strength of the plug being reduced which is undesirable.
Also, the additional elements are unfavorable from a point of view of implants, as it typically desirable to maintain the number parts associated with the implants at a minimum.
Method used
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[0024]As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure.
[0025]The reference 1 generally indicates a thread form or thread in accordance with the present invention that is located on a medical implant closure 5 that is used in conjunction with a rod member 6 and an open headed medical implant 7.
[0026]Describing the elements in reverse order, the illustrated open headed medical implant 7 is a bone screw for use in spinal surgery. The implant 7 includes a shank 11 having a bone engaging and implantation thread 12 the...
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A thread is located on a cylindrical closure for an open headed medical implant. The thread has a leading surface and a trailing surface that both slope rearwardly from an interior edge to an exterior edge thereof.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application a continuation of U.S. patent application Ser. No. 10 / 964,156, filed Oct. 13, 2004 that is a continuation of U.S. patent application Ser. No. 09 / 644,777, filed Aug. 23, 2000, the disclosures of which are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]The present invention is directed to a threadform for use in threadedly joining together two elements and, in particular, to a threadform for joining together medical implants. The threadform includes a leading surface and a trailing surface, both of which slant rearwardly and away from the direction of advancement from an inner edge to an outer edge thereof.[0003]Medical implants present a number of problems to both surgeons installing implants and to engineers designing them. It is always desirable to have the implant be strong and unlikely to fail or break during usage. It is also desirable for the implant to be as small and lightweight as possible so th...
Claims
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IPC IPC(8): A61B17/86
CPCA61B17/7032
InventorJACKSON
OwnerJACKSON ROGER P