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Femtosecond laser bone processing positioning and processing method based on optical signal monitoring

A femtosecond laser processing and femtosecond laser technology, applied in the field of laser positioning and processing technology in the medical field, to achieve the effects of optimizing processing parameters, high precision, and simple and intuitive methods

Pending Publication Date: 2019-08-06
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

What's more complicated is that bone tissue has a layered structure and the organization, composition and structure of each layer are different, so different processing and cooling parameters need to be adjusted accordingly to optimize the processing process, but how to precisely adjust it still needs to be solved urgently

Method used

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  • Femtosecond laser bone processing positioning and processing method based on optical signal monitoring
  • Femtosecond laser bone processing positioning and processing method based on optical signal monitoring
  • Femtosecond laser bone processing positioning and processing method based on optical signal monitoring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The pig rod bone with the closest structure and tissue to the human bone was selected as the experimental sample, with a thickness of 3mm. Before the pig was slaughtered and the processing experiment started, the pig bone was placed in the refrigerator to freeze, and the surface connective tissue and periosteum were removed with a blade before processing. , rinse the blood cells with water.

[0032] (2) Place the sample on the sample stage of the femtosecond laser processing system, set the average power of the femtosecond laser to 15W, the repetition frequency to 100kHz, the beam scanning speed to 150mm / s, set the scanning pattern to be circular, and the scanning distance to be 20 μm.

[0033] (3) First adjust the distance between the field lens and the sample to be processed to be higher than the focus position, generate a second harmonic green light signal, use the green light to indicate the positioning, adjust the X-Y axis of the sample displacement table, and ...

Embodiment 2

[0037] (1) The processing of the pig bone sample is the same as that in the implementation case 1.

[0038](2) Place the sample on the sample stage of the femtosecond laser processing system, set the average power of the femtosecond laser to 20W, and set the repetition frequency to 100kHz.

[0039] (3) First adjust the distance between the field lens and the sample to be processed to be in the focus position, set the value of the pulse selector to 1000, generate a second harmonic green light signal, use the green light to indicate the positioning, and adjust the position of the galvanometer to the specified position.

[0040] (4) Quickly adjust the value of the pulse selector according to the change of the optical signal, control the movement of the sample stage to drive the bone sample, and obtain the desired processing effect.

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Abstract

The invention relates to a laser bone processing monitoring and processing method based on optical signal monitoring generated by interaction of a 1 [mu]m femtosecond laser and a bone material. Accurate positioning is achieved by a second harmonic green light signal, and the femtosecond laser processing parameters are quickly optimized according to the change of the optical signal during the processing, and the low-damage and carbon-free bone processing that integrates positioning, processing and monitoring is realized. The method comprises the following steps: 1. cleaning and freezing the bone tissue, 2, indicating the positioning of the second harmonic green light signal generated by low power density femtosecond laser illumination, and 3, adjusting and optimizing the laser processing parameters so that the optical signal is in a state where the green light signal is relatively lowered, and quickly adjusting the laser processing parameters according to the change of the optical signal to complete the femtosecond laser bone processing. The method is expected to be applied to the field of artificial bone and animal bone processing and clinical treatment of bone surgery in vitro.

Description

technical field [0001] The invention belongs to the application of laser positioning and processing technology in the medical field, in particular to a femtosecond laser bone processing positioning and processing method based on optical signal monitoring. It is expected to be applied to orthopedic surgery, and provide a new idea and technical support for in vitro artificial bone and animal bone processing. The invention has good application prospects in the fields of bone processing positioning and bone defect treatment. [0002] technical background [0003] In recent years, with the development and changes of society and lifestyle and the aging population, the incidence of orthopedic diseases such as arthritis and fractures has increased year by year, and bone processing is one of the most commonly used technical means for orthopedic treatment. The traditional bone processing method adopts the mechanical processing method. Due to the mechanical action and the thermal effec...

Claims

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Application Information

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IPC IPC(8): A61B18/20
CPCA61B18/20A61B2018/00565
Inventor 管迎春胡国庆宋杨
Owner BEIHANG UNIV
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