A rotary cutting device with single negative pressure source and single air channel

Abstract

The invention discloses a single-negative pressure source single-air passage rotary cutting device. The single-negative pressure source single-air passage rotary cutting device comprises a sheath, a sampling cabin is arranged at the position of the sheath near a puncturing part, a mounting cavity in which a rotary cutting knife tube reciprocates along the axial direction of the sheath is arranged in the sheath, the rotary cutting knife tube is hollow tubular, a circular ring-shaped blade is arranged at the rotary cutting end of the rotary cutting knife tube, a knife feeding / retracting device is arranged at the tail end, the inner cavity of the rotary cutting knife tube is communicated with a sample gathering box, and the inner cavity of the sample gathering box is communicated with a negative pressure pumping device; the mounting cavity is communicated with the sampling cabin, a groove which extends along the axial direction of the sheath is formed in the bottom of the sampling cabin, and an air groove communicated with the groove is formed in the side wall of the mounting cavity along the axial direction. The rotary cutting device is simple in structure, small in volume, low in power consumption, capable of enabling the adsorption force below the sampling cabin to be automatically regulated according to the adsorption degree so as to guarantee the full sampling tissue in the rotary cutting knife tube, good in rotary cutting effect and high in sampling success rate.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a single negative pressure source and single airway rotary cutting device. Background technique [0002] In the clinical medical process, it is often necessary to sample and detect the diseased tissue (or other tissues to be detected) in the body to determine the cause of the disease. The most widely used sampling device for the diseased tissue in the body is mainly a vacuum (negative pressure) rotary cutter. During the rotary cutting process, the vacuum rotary cutting tool needs two negative pressures: one is the negative pressure obtained by the rotary cutting knife tube passing through the sample chamber, which is used to suck the tissue sample into the knife tube during rotary cutting, and after rotary cutting The tissue sample is sucked into the sample chamber; the other is the lateral negative pressure of the rotary cutting sampling chamber, which is used to absorb ...

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Problems solved by technology

[0003] But the negative pressure sources of the above-mentioned two airways of the existing rotary cutter are all independently set, and in the actual sampling process, it is difficult to pre-set the pressure values ​​of the two airway negative pressure sources with the hardness and viscosity of the diseased tissue. Attachment matches

If the negative pressure of the airway connected to the sampling chamber is too small, the adsorption capacity of the sampling chamber to the diseased tissue will be weak, and the adsorbed diseased tissue will not be able to fill the cavity of the rotary cutter tube. When the piston moves in the airway of the rotary cutter (under the action of the negative pressure source, the excised lesion moves along the airway of the rotary cutter to the sample collection box) often stays in the airway of the rotary cutter due to air leakage It cannot be pumped out; if the negative pressure of the airway connected to the sampling chamber is too large, too much diseased tissue will be sucked into the sampling chamber, and the air passage of the rotary cutter tube will be easily blocked when it is cut off and moved in the rotary cutter tube ; Therefore, the sampling efficiency and sampling success rate of this rotary cutting tool are all low, and sometimes multiple sampling is required, which brings more pain to the patient; and the design mode of this dual air source makes the structure of the whole rotary cutting device complicated , larger volume, more energy consumption, higher production cost

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