Patent ID: 11950859
Assignee: BEI JING LONGWOOD VALLEY MEDICAL TECHNOLOGY CO. LTD
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 3:
4. The navigation and positioning system of claim 3, wherein if the optical tracking submodule registers the hip joint entity model based on the spatial position relationship between the mechanical arm and the pelvic reference frame and the femoral reference frame, the optical tracking submodule is configured to:
use a triangle as a minimum unit in a registration process, and if points marked by a surgeon during a surgery are A, B and C, corresponding preoperative planned points are a, b and c, wherein the points marked by the surgeon are on a surface of human tissue;
select a′, b′ and c′ from neighborhood space point sets corresponding to a, b and c, wherein all three points a′, b′ and c′ are on the surface of human tissue, and a triangle a′b′c′ composed of the three points a′, b′ and c′ and a triangle composed of the three points A, B and C are congruent triangles; and
correct preoperative planned spatial positions of a, b and c to spatial positions of a′, b′ and c′, and register the points marked during the surgery and the preoperative planned points by using a registration mode.