DE2025224A1 - Cryogenic treatment device - Google Patents

Description

LH alb Or-fan. Herbert Mtmr

Pßion-.anv / alt

75Karlsruw, tuin, gerstra3 $ Ea 2025224

Applicant: leybold-Heraeus GmbH & Co. KG, Cologne Cryotonic treatment device

The invention relates to a cryotechnical treatment device with a cryoscalpel consisting of a handle part and a knife part, which is connected to a Supply part is connected, which is a storage vessel for contains condensed gases and an electrical control and Hegel device, the hollow knife part being an electrical one Has heating and can be switched between an operating state "warm" and "cold".

The well-known cryoscalpel, which is used for the operation of parenchymatous tissue, has the task of ^{supercooling the cutting flank after the cut has been made (operating state "warm 1} *) (operating state" cold ") and thus stopping primary bleeding. In order to minimize blood loss To keep the temperature of the Hessers a few seconds after switching on the "cold" operating mode should have dropped to about -60 ° G. After a certain freezing zone of 2 to 5 mm has penetrated into the tissue, the cryoscalpel must be warmed up to the surface of the wound flank thaws and the ice adhesion between the knife and the wound flanks is released

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Cryoscalpel must be thawed with the highest possible power without affecting temperatures above room * temperature is heated.

The invention is based on the task of providing a kryotechnisoh.es treatment device with a cryoscalpel. create, which reaches the temperature values required in the operating states "warm ¹¹ and" cold "within a very short time. The characteristic of the invention is to be seen in the fact that 'the supply hose is precooled up to the knife part, and that the knife part is cooled in the" warm "operating state , whereby the operating state "warm" is created by additional electrical heating, which compensates for the cooling effect *

The cryoscalpel consists expediently of a hollow knife, on the inner surface of which a resistance heating element and a thermal sensor are attached. The heat / insulated handle part is hollow and that of the knife part. The opposite side is open, and through this opening the supply hose with the liquid nitrogen injector, the exhaust pipe and a multi-pole electrical connection line can be inserted.The injector protrudes far into the hollow knife part, while the exhaust pipe is somewhat shorter and surrounds the injector pipe coaxially. -, ■■ - '

To facilitate handling, it can also be useful that the cryoscalpel is attached to the supply cord

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is rotatably mounted. A possible execution can be in a rotatable articulation of the cryoscaling arrow on the supply tube. However, it may also be useful if necessary be, the connection between cryoscalpel, supply " To form hose and storage vessel for condensed gases without a rotary coupling and the supply vessel can be rotated to store.

The supply hose can advantageously have a detachable one Coupling piece made from a triple coaxial metal hose be formed, the innermost part as a liquid nitrogen supply, the middle part as an exhaust pipe and the outer

hose part serve as vacuum hose, this supply jitw? will then connected to the supply unit, see in the storage vessel for the condensate in a common housing based gases, especially liquid nitrogen, as well as a electrical control and control device, which is in Connection with the temperature sensor in the hollow knife part a temperature control of the Hess part enables »

Since "cold" of the blade portion is kept permanently in the manner described in the foregoing embodiment © in operating condition, the transition to the Betriebsaustand carried out "warning ¹¹ by brief, intensive Behelziung, is advantageous in the operating condition" warm "the see hasten transition & A £ the Betriebszwstand" cold "prepared by the fact that a small current constantly wnd introduced at liquid nitrogen from forratagifäS in ä & ii diameter portion is evaporated there, the Versorgungsschlauoh vird continued at low

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temperature, and when switching to the operating position "Cold" can immediately use the full amount of the liquid oil medium can be injected into the hollow part of the knife without first evaporation due to the required precooling of the supply hoses is necessary, but in order to prevent that the knife part through this, albeit small pre-cooling current is cooled too far, the electric heater is in Connection with the temperature control designed so that the knife part is approximately at ambient temperature (operating state "warm") is kept. The pre-cooling flow is adjusted by a nozzle on the exhaust side of the supply hose.

It appears expedient to design the cryoscalpel in such a way that that the knife part is designed interchangeably on the heat-insulated handle part for the use of different knife shapes.

A convenient arrangement can be made using a foot switch be designed so that the knife part is kept in the "cold" operating position as long as this foot switch remains pressed. For this purpose, a solenoid valve, which is located on the exhaust side of the supply hose, opened. This will get the full jet of the liquid Cooling medium into the hollow part of the knife and cools it down »When the foot switch is released, the temperature changes of the knife part quickly to the ambient temperature, for this closes the solenoid valve and throttles the jet of cooling medium to the required quantity for preparatory cooling, while at the same time full electric heating

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is switched on. When the ambient temperature is reached in the knife part the full heating power is throttled, and the By counter-heating, the temperature control keeps the knife part at room temperature against the residual cooling effect.

In an advantageous embodiment, the pressure build-up caused to promote the condensed cooling medium in the storage vessel by an electric heater known per se a pressure switch is provided which, when the operating pressure is reached, automatically makes a further pressure increase ineffective by opening a pressure relief valve power.

In addition, it may be useful to provide an automatic timer in such a way that the time span of the The "cold" operating state and thus the duration of the freezing process are determined or the freezing process is automatic is switched off. Since the previously determined by the surgeon Depth of the freezing zone in the tissue is time-dependent, 'can a built-in timer, which is set beforehand by the surgeon and also activated by the foot switch will either trigger an acoustic signal for the end of the freezing process or the freezing process directly, switch off. .

In the drawing is a cryotechnical treatment device shown schematically according to the invention.

One recognizes a cryoscalpel 3 consisting of a heat-insulated handle part 1 and a hollow knife part 2, wherein

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at the end of the handle, which is also hollow, part 1 a plug-in coupling * - ment for the connection of a flexible supply hose 4 is provided. This flexible supply hose 4 has a rotatable coupling part 5 with a multi-lip elastic plug seal 6 and is threefold formed coaxially with an inner liquid gas supply line 7. In a supply part 8 there is a rotatably mounted storage vessel 9 for condensed gases, the Connected via a flange seal 10 to a corresponding flange part 1f of the supply hose 4 can be. A delivery pipe 12 is immersed in the liquid filling of the storage vessel 9, and this delivery pipe 12 is surrounded by a heating coil 13 which, when energy is supplied, causes the pressure to rise in the storage vessel 9.

At the end of the lying on the side of the storage vessel 9 Supply cushions 4 are also a metering valve 15 and a solenoid valve 16 in a branch piece 14 provided for pressure equalization with respect to the interior of the storage vessel 9.

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Claims (3)

Expectations I, j Cryotechnical treatment device with a cryoscalpel consisting of a handle part and a knife part, which is connected via a supply hose to a supply part that contains a storage vessel for condensed gases and an electrical control and control device, the hollow knife part having electrical heating and between a The "warm" and "cold" operating states can be switched, characterized in that the supply hose (4) is precooled up to the knife part (2), and that the knife part (2) is cooled in the "warm" operating state, the "warm" operating state being is produced by additional electrical heating, which compensates for the cooling effect. 2. Cryogenic treatment device according to claim 1, thereby g e k e η η ζ e i c h η e t that the cryoscalpel consisting of knife part (2) and handle part (1) (3) is rotatably connected to the supply part (8). 3. Cryogenic treatment device according to claim 2, characterized in that the Cryoscalpel (3) consisting of knife part (2) and handle part (1) via a flexible supply hose (4) is connected to a storage vessel for condensed gases (9) rotatably mounted in the supply part (8). 109B50 / QA98 Blank page