SU532976A1 - Apparatus for local refrigeration of tissue - Google Patents

Claims (1)

The invention relates to medicine, in particular, to cryoextractors, which are included in the kit of cryocoagulators, and can be used for surgical intervention mainly in otolaryngology, gynecology, oncology and neurosurgery. A device for local tissue cooling is known, comprising a housing with a refrigerant supply nozzle, a replaceable working tip, made in the form of a cannula plugged from the head end, into which a pipe for supplying refrigerant articulated with the inlet fitting is inserted with an annular gap, while the annular gap cavity is open The camera is inside the enclosure. However, the transfer of cold from the cannula of the proposed cryoextractor to biological tissue takes place practically at a point, i.e. there is no regulation of the cryogenic zone, which limits the use of cryoextract. For this, the casing is equipped with a telescopically movable heat-insulated casing covering the cannula along a sliding fit. The drawing shows the proposed device, a longitudinal section. The device includes a housing 1, a component of which is a telescopically movable thermally insulated housing 2, which includes a replaceable cannula 3 along a sliding attachment. On the back side of the housing 1 there is a tube 4 for supplying refrigerant from the source (Dewar vessel, etc.) and tube 5 for evacuating evaporated nitrogen. Pipe 4 extends over pipe 6, coaxially with an annular gap introduced into cannula 3, plugged K) from the head end and equipped with a temperature sensor 7, the leads of which are connected to plug connector 8. The annular gap between the wall of cajule 3 and pipe 6 is open an expansion chamber 9 communicating via a nozzle 1O and a tube 5 with the atmosphere. j53 B) under the hood 2, a double heater 11 is placed to defrost and regulate the temperature at the bare end of the cannula 3 in accordance with the VII with the task and the factual temperature measured by sensor 7. When preparing the proposed cryoextractor for operation in case 1, the unit is required the length and diameter of the cannula 3, and then, by displacing the casing 2 along the axis, establish the required length of the working section of the cannula 3, include a temperature measuring circuit and supplying nitrogen through the tube 4; straktor used as follows Udernshva hand body 1, the cannula 3 is introduced into the fabric, in particular a sectional exposes the surgical field. Liquid nitrogen flowing through conduit 6 into cannipu 3 causes freezing of tissues, which are extracted using both a cannula at a temperature of (-80) C and using an auxiliary tool (scraper, etc.). "Removed together with cannula 3 the tissue particles are removed with the electric heater 11. Then the electric heater 11 is turned off and, having cooled the cannula 3 to the working temperature, repeat the cryo-extraction cycle. The temperature of the working cannula 3 during the operation is continuously monitored and adjusted using the automation and control means provided by the cryocoagulator design, which includes the described tool (or other known instruments) Formula of the invention - tubes for supplying and discharging refrigerant; working tip, temperature sensor, heater, characterized in that, in order to regulate the cryogenic effect zone, the housing is provided with a body a scopically movable heat-insulated housing covering the cannula along a sliding fit. , D || ..,. | G.,. | I, D / L