Planing cutter capable of preventing negative pressure loss

Abstract

The invention discloses a planing cutter capable of preventing negative pressure loss and a medical planing device.The planing cutter comprises an outer cutter tube assembly and a cutter handle, the cutter handle is provided with a center hole penetrating in the axial direction, and the tail end of the outer cutter tube is inserted into the center hole of the cutter handle; the inner knife tube assembly comprises an inner knife tube and a connecting piece, the inner knife tube is arranged in the outer knife tube and can rotate around the axis of the outer knife tube, the inner knife tube is provided with an extending section extending out of the outer knife tube, and the rear end of the extending section is connected with the head end of the connecting piece; the sealing ring is arranged between the outer wall of the extending section or the outer wall of the connecting piece and the inner wall of the center hole and is used for sealing a gap between the outer wall of the extending section or the outer wall of the connecting piece and the inner wall of the center hole. According to the planing cutter, negative pressure can be prevented from running away from the gap between the inner cutter head and the outer cutter head and the gap between the inner cutter pipe and the outer cutter pipe, tissue can be prevented from entering the gap, the tissue and the negative pressure are made to pass through the suction channel of the inner cutter pipe in a concentrated mode, planing efficiency and suction efficiency can be effectively improved, and cutter blockage is prevented.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a planer tool for preventing negative pressure loss. Background technique [0002] Planing knives are used in arthroscopic surgery, ENT and other surgeries. Existing planing tools usually include an outer cutter tube assembly and an inner cutter tube assembly that is arranged in the outer cutter tube assembly and can rotate relative to the outer cutter tube assembly. The head end of the outer cutter tube assembly is provided with an outer cutter head, and the inner cutter tube The head end of the assembly is provided with an inner cutter head. When the inner cutter tube assembly rotates relative to the outer cutter tube assembly, the outer cutter head and the inner cutter head move relative to each other to cut off the human tissue. The head passes through the inner knife tube of the inner knife tube assembly, and then is discharged through the negative pressure suct...

AI Technical Summary

Problems solved by technology

[0003] After the existing planing tool is installed and matched with the handle shell, it is usually sealed by a single end face seal ring arranged at the tail of the outer knife tube assembly. After the seal ring cooperates with the handle shell, it cannot be completely sealed. During the organization, part of the negative pressure will often be lost from the gap between the inner and outer cutter heads and the inner and outer cutter tubes, resulting in a reduction in the suction and planing efficiency of the planer; at the same time, the planed human fascia and other tissues enter the inner , the outer cutter head and the gap between the inner and outer cutter tubes affect the normal operation of the cutter and further reduce the planing and suction efficiency of the cutter

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