High-precision combined type gamma knife collimator and machining method therefore

Abstract

The invention discloses a high-precision combined type gamma knife collimator and a machining method thereof. The high-precision combined type gamma knife collimator comprises an upper positioning ring, a middle ring and a lower positioning ring. The middle ring is composed of multiple segmentation bodies. The multiple segmentation bodies are annularly combined and assembled to the annular middle ring. Each segmentation body of middle ring is provided with multiple collimator holes. The multiple collimator holes are annularly arranged in the middle ring. The upper positioning ring is installed on an upper opening of the middle ring. The lower positioning ring is installed on a lower opening of the middle ring. The middle ring is subjected to three-dimensional segmentation to form segmentation bodies, materials are selected according to the sizes of the segmentation bodies, the surface is roughly machined after heat treatment, fine machining is carried out after flaw detection, a base and the collimator holes are machined, and orderly assembly is carried out; surface rust-proof treatment is carried out after it is detected that the collimator is qualified, and the collimator is put in storage. By the adoption of the scheme of the segmentation bodies, the machining difficulty of the collimator body is lowered, the precision of the collimator parts and the collimator holes is greatly improved, the detection error of the product is reduced, and it is ensured that the requirement for focusing degree is met.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a high-precision combined gamma knife collimator and a processing method thereof. Background technique [0002] Domestic gamma knives usually use castings as the collimator material, and add other elements to prevent rust; the product has the following problems in terms of material, processing, precision, and testing; [0003] 1) The wall thickness of the collimator is relatively thick, and casting defects cannot be avoided; because the product is in a hemispherical shape, there are limitations in flaw detection, and it is impossible to report in all directions; [0004] 2) The processing performance of the casting itself is not good. There are dozens to more than one hundred collimator holes on the surface of the part hemisphere, which can only be processed by special machine tools and five-axis machine tools. It is difficult to achieve high-quality, high-quality, and high-prec...

AI Technical Summary

Problems solved by technology

[0003] 1) The wall thickness of the collimator is relatively thick, and casting defects cannot be avoided; because the product is in a hemispherical shape, there are limitations in flaw detection, and it is impossible to report in all directions;

[0004] 2) The processing performance of the casting itself is not good. There are dozens to more than one hundred collimator holes on the surface of the part hemisphere, which can only be processed by special machine tools and five-axis machine tools. It is difficult to achieve high-quality, high-quality, and high-precision holes; at the same time, processing is also quite difficult and the cost is high;

[0005] 3) The collimator holes made by traditional technology have steps, tapers, ellipses, overcuts, irregularities, etc. in the holes, and the surface of the holes has pull marks, overcuts, etc., which are relatively rough, and the accuracy of the collimator holes is not as good. Ways to ensure that the focus is generally SØ0.3-0.5mm

[0006] 4) Collimator holes vary in size, so many inspection rods must be made; the surface quality of the holes is poor, and inspection rods are easily damaged; holes have defects such as steps and ellipses, which have a great impact on measurement errors and cannot truly reflect the holes the actual situation

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