Patent ID: 11857204
Assignee: SYNTHES GMBH
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 43:
44. A method for bone screw length estimation from drilling characteristics using the surgical power drill according to claim 29, comprising the following steps:
advancing the surgical power drill coaxially to the longitudinal axis of the spindle to drill a hole in a bone and by recording a position of a cutting tip of the drill bit relative to a surface of a bone or of an implant in a drilling direction with respect to time;
determining the distance covered by the drill bit relative to a surface of a bone or of an implant when the cutting tip of the drill bit exits a cortex of a bone by using the stored reference data to find the position of the transition of the drill bit from a first medium to a second medium in the recorded graph;
selecting a bone screw having a length corresponding to the distance covered by the drill bit determined during the determining step under consideration of a predefined safety margin.