Method for making a surgical guide for bone harvesting

Abstract

The invention relates to a method for making a surgical guide (1) for performing bone harvesting (O), including: generating a three-dimensional image (20) of at least one portion of a bone of a patient (Pa) where said harvesting is to be performed, said bone defining an outer surface (4); identifying in said three-dimensional image (20) one or more sensitive anatomic structures (21) that must not be involved in said bone harvesting; identifying in said three-dimensional image (20) a volume (30) of bone suitable for being removed in said bone harvesting, said volume excluding said sensitive anatomic structures, and said volume being delimited by a portion (6) of said outer surface (4) of said bone defining a perimeter (31) and by a mantle (38) extending from said perimeter inside said bone, said mantle including, for each point of said perimeter, a segment forming a predetermined angle (a,b) with said portion of outer surface, said angle corresponding to a cutting direction (L1, L2, L3, L4) inside said bone identified in said three-dimensional image;designing said surgical guide (1), said guide defining a guide surface (8) suitable for being rested on said outer surface (4) of said bone, said guide surface comprising a work area (2) delimited by guide walls (5a,5b,5c,5d), said work area having a perimeter (3) corresponding to the perimeter (31) of said portion of surface (6) of said bone identified in said three-dimensional image; angling at least one of said walls with respect to said guide surface (5a,5b,5c,5d), so that said wall includes a face (7a,7b,7c,7d) that constitutes a geometrical extension of a portion of said mantle (38) of said bone volume (30), when said guide is rested on said outer surface of bone, so that said face includes, for each point of said perimeter of work area, a segment forming a predetermined angle with respect to said guide surface.

Description

technical field [0001] The present invention relates to a method of making a surgical guide for performing osteotomies used in bone harvesting procedures. The surgical guide precisely provides the surgeon or medical professional with operating parameters related to the surface of the resting bone on which the guide is located, and its configuration depends on the evaluation of the patient's specific anatomy reconstructed by three-dimensional measurements, thus allowing sensitive Complete osteotomies are performed simultaneously with critical anatomical structures (eg, neuro-vascular and dental structures). Background technique [0002] The present invention relates to the field of surgery, and in particular to the field of autologous bone harvesting for reconstruction of bone defects. Preferably, but not exclusively, the invention is applied in the field of oral surgery. [0003] After a tooth element has been lost (due to trauma or pathology), the alveolar ridge usually u...

AI Technical Summary

Problems solved by technology

[0022] - More generally, the precise control of determining the working axis of the bone cutting tools (they are rotary or piezoelectric tools) "with the naked eye" in this case is also extremely complex

[0023] The fact that it is not possible to work with precision and certainty means that when performing the surgical procedure the estimated, taken bone volume is reduced and the surgical risk is increased

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