Distal dynamic screw hole fixation method for intramedullary nails and hollow expanded screw structure

Abstract

This invention relates to a method for fixing distal dynamic screw holes in an intramedullary nail and a hollow enlarged screw structure. First, an intramedullary nail with a built-in positioning device is inserted into the bone marrow cavity of a bone. A power supply device activates at least one light-emitting element, allowing light to penetrate from the inside out through at least one light-transmitting part and the dynamic perforation at the distal end of the intramedullary nail. Subsurface scattering creates a halo on the surface, marking the location. After removing the positioning device, a drilling tool drills holes at the marked locations and their opposite sides to insert a guide pin through the formed bone perforations. Next, a hollow enlarged screw is fitted onto the guide pin, and a locking tool connects one operating part of the hollow enlarged screw. The self-tapping head of the screw enlarges the bone perforations and dynamic perforations, while the threaded portion secures the bone and the intramedullary nail. This provides multi-angle positioning options, accurate proximal and distal drilling, and a simple yet robust fixation effect.

Claims

1. A method for fixing the distal dynamic screw hole of an intramedullary nail, comprising the following steps: An intramedullary nail is taken and placed into the intramedullary cavity of a bone. The intramedullary nail has a receiving portion and a plurality of interconnected dynamic perforations located on two opposite sides of the intramedullary nail. A positioning device is placed into the receiving portion. At least one light-emitting element is activated using a power supply device within the positioning device, so that light passes through at least one light-transmitting portion and each of the dynamic perforations from the inside out, generating a halo on the bone and skin surface by subsurface scattering, and marking is made on the halo. A drilling tool is used to drill holes at the marked locations and the corresponding marks on the skin to form two bone perforations on two opposite sides of the bone, corresponding to the positions of each of the dynamic perforations. The positioning device is removed, and a guide needle is inserted through each of the bone perforations and each of the dynamic perforations. A hollow enlarged screw with a hollow perforation is fitted onto the guide needle. A locking tool is used to connect one of the operating parts of the hollow enlarged screw, and the self-tapping head of the hollow enlarged screw is used to enlarge each of the bone perforations and each of the dynamic perforations; the locking tool continues to lock the hollow enlarged screw, and the bone and the intramedullary nail are fixed by using the threads on the screw body; and the guide pin is removed.

2. The method for fixing the distal dynamic screw hole of the intramedullary nail as described in claim 1, wherein the length of the light-emitting element is 3mm to 25mm.

3. The method for fixing the distal dynamic screw hole of the intramedullary nail as described in claim 2, wherein a first upper opening point and a first lower opening point are defined at both ends of the halo on one side of the bone and the skin, and a second upper opening point and a second lower opening point are defined at both ends of the halo on the other side of the bone and the skin, the direction of the line connecting the first upper opening point and the second lower opening point is defined as a first locking direction, the direction of the line connecting the second upper opening point and the first lower opening point is defined as a second locking direction, and the angle between the first locking direction and the second locking direction is defined as a screw hole angle positioning range.

4. The method for fixing the distal dynamic screw hole of the intramedullary nail as described in claim 1, wherein the positioning device has a fixing device at the end opposite to the light-emitting element for fixing the power supply device.

5. The method for fixing the distal dynamic screw hole of an intramedullary nail as described in claim 4, wherein the light-emitting element has a running light module fixed by the fixing device.

6. A hollow expanded screw structure for the distal dynamic screw hole of an intramedullary nail, comprising: An intramedullary nail is inserted into the bone marrow cavity of a bone; a receiving portion is formed within the intramedullary nail; a positioning device is detachably disposed within the receiving portion and includes: at least one light-emitting element; a power supply device electrically connected to the light-emitting element; at least one light-transmitting portion corresponding to the light-emitting element and located on the side of the positioning device; a plurality of dynamic perforations connected and formed on opposite sides of the intramedullary nail; two bone perforations connected and formed on opposite sides of the bone and corresponding to the positions of each dynamic perforation; a guide pin detachably inserted through each bone perforation and each dynamic perforation; a hollow enlarged screw simultaneously inserted through each bone perforation and each dynamic perforation and includes: a screw body; an operating portion formed at the end of the screw body; and a hollow perforation formed through the screw body for detachably fitting the guide pin. A self-tapping head extends from one end of the screw body away from the operating part; and a plurality of threaded portions are formed on the outside of the screw body and are distributed between the operating part and the self-tapping head.

7. The hollow expanded screw structure of the distal dynamic screw hole of the intramedullary nail as described in claim 6, wherein the length of the light-emitting element is 3mm to 25mm.

8. The hollow expanded screw structure for the distal dynamic screw hole of the intramedullary nail as described in claim 7, wherein a first upper opening point and a first lower opening point are defined at both ends of the halo on the bone and skin side, and a second upper opening point and a second lower opening point are defined at both ends of the halo on the other side of the bone and skin, the direction of the line connecting the first upper opening point and the second lower opening point is defined as a first locking direction, the direction of the line connecting the second upper opening point and the first lower opening point is defined as a second locking direction, and the angle between the first locking direction and the second locking direction is defined as a screw hole angle positioning range.

9. The hollow expanded screw structure of the distal dynamic screw hole of the intramedullary nail as described in claim 6, wherein the positioning device has a fixing device at the end opposite to the light-emitting element for fixing the power supply device.

10. A hollow expanded screw structure for the distal dynamic screw hole of an intramedullary nail as described in claim 9, wherein the light-emitting element has a running light module fixed by the fixing device.

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