One of the most important indicators of the quality of biological tissue (pericardium) used in the creation of prostheses for heart valves and blood vessels is the uniformity of its thickness.
Turn-key solution on the base of standard CNC machine for laser cutting is designed to solve this problem.
Laser System for Biological Tissue Thickness Measurement and Cutting
Laser System for Biological Tissue Thickness Measurement and Cutting.
| Parameter | Value | |
| Measurement object | pericardial tissue for making prostheses | |
| Measured parameter | thickness distribution | |
| Thickness measurement error, mm | ±0.03 | |
| Scan area size | determined by the model of the laser cutting machine | |
| Scan speed, up to, mm/s | 100 | |
| Power supply | three-phase ac network with frequency (50±1) Hz, rated voltage 220/380 v with voltage tolerance ±10% |
|
| Template file format | .dxf | |
| 2D laser scanner | RF627.Blue-25/10-8/11 | |
| Operating frequency, profiles/s | 1000 | |
The structural scheme of the system is shown in Figure 1. The system is implemented on the basis of a CNC laser cutting machine with a Ruida controller or similar. The machine is controlled via a central computer using specialized software. The 2D laser scanner is mounted on the movement system of the machine. In the measurement mode, the CNC system of the machine moves the sensor line by line (snake) over the material. The sensor measures the distance (Z coordinate) to the surface of the material.
Data pickup from the sensor is synchronized with its movement (XY coordinates) and the result is transmitted to the computer via the Ethernet port. The software creates a material height map.
Figure 1 - Structural scheme
The operation of the system includes the following stages:
1 - Calibration. At this stage, the system scans the surface of the object plate and generates a height map in the scanner coordinate system.2 - Measurement of the biomaterial thickness and formation of its height map. At this stage, the system scans the surface of the biomaterial placed on the object plate. The thickness of the biomaterial is calculated as the difference between the heights of surface of the biomaterial and the object plate.
3 - Programmatic placement of patterns selected from the database on the height map of the biomaterial.
4 - Laser cutting of the biomaterial in accordance with the location of the patterns.
Laser System for Biological Tissue Thickness Measurement and Cutting. Demo-video.