Process method for non-carbonization deep hole of in-vitro bone drill through ultraviolet picosecond laser variable-focus ring cutting

Abstract

The invention discloses a process method for a non-carbonization deep hole on an in-vitro bone drill through ultraviolet picosecond laser variable-focus ring cutting. The process method comprises the following steps of carrying out a first stage of groove ring cutting stage: performing variable-focus ring cutting drilling on the surface of an in-vitro bone tissue along a scanning path in the depth direction by using a ultraviolet picosecond laser processing head in a multi-circle negative out-of-focus scanning irradiation mode, forming a shallow annular groove; and carrying out a second-stage groove ring cutting stage: after the first-stage groove ring cutting stage is completed, combining with the actual thickness of the in-vitro bone tissue, gradually increasing the displacement amount and the displacement step number of the ultraviolet picosecond laser processing head in the depth direction, and continuing to perform in-situ variable-focus ring cutting drilling on the shallow annular groove for multiple times until the expected drilling depth is reached. According to the process method, the problems of bone tissue carbonization and bone strut removal in the deep hole laser bone drill process are solved, the problem of bone tissue carbonization in the deep hole drilling process is effectively solved while the drilling efficiency is guaranteed, and the stability of the required deep hole of the bone drill is guaranteed.

Description

technical field [0001] The invention relates to the technical field of laser bone drilling, in particular to a process method for circumcutting non-carbonized deep holes of ex vivo bone drills with an ultraviolet picosecond laser zoom point. Background technique [0002] At present, the commonly used bone drilling method is mechanical drilling. However, for the through-hole drilling of long bones such as femur and tibia, this mechanical drilling method has a series of problems. For example, due to the large drilling depth, the hardness value of the drilling site changes repeatedly. , the instability, thermal damage and chip removal problems during the drilling process are obvious; when drilling inclined holes with highly curved or irregular surfaces, it is difficult for the drill to achieve balance, the positioning of the drill is difficult, and it is easy to slip; A large amount of mechanical heat energy or the handle of the drill bit is not stable, which may easily cause t...

AI Technical Summary

Problems solved by technology

However, severe carbonization in the process of laser drilling deep holes in hard bone tissue has always been an important problem to be solved, and there is no process to guide the realization of carbonization-free deep holes within a certain laser power range

Circumcision drilling is considered to be a more time-saving drilling method, but the removal of the central bone pillar of the drill hole during the circumcision drilling process still needs to be further resolved

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