Motion conversion mechanism for soft tissue cutting

Abstract

The invention provides a motion conversion mechanism for soft tissue cutting. The mechanism comprises a power handle, and is characterized in that the power handle is internally provided with a connector, a motion changing block, a spring and a fixing sleeve, wherein a central area of the power handle is provided with a hollow groove, the connector is arranged at the front end of the hollow groove, the motion changing block is arranged at an intermediate area of the power handle, the fixing sleeve is arranged at the rear of the motion changing block, and the spring is arranged between the motion changing block and the fixing sleeve. The motion conversion mechanism for soft tissue cutting has the advantages that the original rotary motion is turned into linear reciprocating cutting to avoidvarious dangers caused by deflection; the motion conversion mechanism can achieve that twice meshed cutting actions are carried out on tissue every time a motor rotates a round through the motion changing block, so that the entire cutting efficiency is improved; the vibration of the handle is reduced while ensuring the cutting efficiency.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a motion conversion mechanism for soft tissue blanking. Background technique [0002] Joints are the most vulnerable structure because of their repetitive motion and often bear reciprocating loads, impacts, etc., and the number of patients with cartilage injuries, synovitis, and meniscus injuries has increased sharply with the aging trend of the population. The joint tissue needs to be removed or repaired by surgery. Endoscopic surgery belongs to the category of minimally invasive surgery. Compared with traditional open surgery, minimally invasive surgery has the advantages of less trauma, faster recovery and fewer complications. Endoscopic surgery is being accepted by more and more patients. The demand for endoscopic surgical tools such as minimally invasive planers has also increased dramatically. [0003] The power planing system is the key cutting inst...

AI Technical Summary

Problems solved by technology

[0004] However, the existing arthroscopic minimally invasive and efficient soft tissue cutting instruments are mainly rotary planers, such as planers, grinding heads, etc. In terms of cutting effect, the minimally invasive rotary planers have small cutting volume, easy to cause chip blockage, and uneven cutting end faces From a structural point of view, the inner and outer tubes of the minimally invasive rotary planer are small-diameter and long-axis parts, the tube wall is thin and the strength is insufficient, and there is no accurate rotational positioning between the inner tube shaft and the outer tube, resulting in the inner tube in the passive force. When the system drives high-speed rotation, the distal end of the inner tube that plays a cutting role has a large rotational deflection range, so the distal end of the inner tube and the cutting teeth on the distal end will collide with the distal end of the outer tube, seriously affecting the tool life , sharpness, cutting stability and safety

[0005] In addition to minimally invasive planing tools, there are also a series of manually operated minimally invasive surgical forceps, such as blue forceps, minimally invasive scissors, olecranon forceps, etc., but these fine instruments have very small cutting volume due to their weak structure and insufficient strength. The rotating shaft at the distal end is easily broken when it is stressed during cutting, resulting in failure of the operation and damage to the patient.

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