DE2549922A1 - Cryoanaesthesia of gangrenous extremities - using freezing pad connected to cooling component with compressor - Google Patents

Abstract

Appts. for cryo anaesthesia of a gangrenous extremity to be amputated comprises a cooling component (1) with a compressor (2) on one side of which is a low-pressure opening for intake of recycled gaseous coolant. On the other side is a cooling pipe oil (3) to which is connected a flexible high-pressure pipe (4) with an expansion valve. A flexible low-pressure pipe is connected to the low-pressure opening of the compressor. A freezing pad (40) comprises inner and outer layers between which is an undulating pipe (43) covering most of the surface area of the pad. Connecting assemblies conduct coolant to the inlet opening of the undulating pipe at minus temps., and from the outlet opening of the undulating pipe to the cooling component.

Description

Device for cryostatic preoperative treatment

of gangrenous extremities This invention relates to a freezing pillow for performing cold applications on the body during medical treatment. An object of the invention is to provide electrical and mechanical arrangements for establishing a continuous supply of coolants and for circulating the cooling agent through a freezer pillow, which is placed on the body by means of flexible tubes or hoses are in place.

Freezing of a limb is made by the medical profession as an effective method of controlling moist gangrene of an extremity with their indexy and toxic complications have been accepted. after the Circulation between the affected part of the limb completely different from the rest the body is cut off, the surgeon can then initiate supportive measures to improve the general condition of the patient and the surgical amputations initiate as a missed action.

Previously, however, the freezing of the extremity made ineffective, dirty and arduous procedures of applying ice or dry ice to an extremity carried or by actually inserting the limb into a large one and cumbersome component.

In the latter case, the limb becomes completely immobile made and the patient's movement is severely limited. This is unsatisfactory since in many cases the patient is in such a bad condition that tubermonia and other complications may set in, which are exacerbated for the reason because the patient is unable to move. Kdhigerät has long been known been used to apply cooling applications to the body. As early as 1933 revealed Hassell in US Pat. No. 1,896,953 describes an electric ice cap consisting of a serpentine tube inserted between two lids through which a secondary coolant was circulated. harnes in U.S. Patent 3,257,232 1946 a flexible evaporator coil connected to a cell of refrigerant could be used to perform cold anesthesia. Trans at all revealed again U.S. Patent 2,415,455 discloses a wedge-like device for cooling anesthesia consisting of Movable and flexible Fletall: # slats, cooled on one side by letting them run down a coolant in a series of tubular lines.

Zhessey in U.S. Patent 2,726,658 disclosed flexible cushions which are suitable for attachment to the body, which by circulating a secondary coolant or a saline solution, cooled in a cooling component.

As far as I know, the concept of having a secondary is or primary coolant at minus temperatures to a flexible cushion or cooling coil, which can be applied to a gangrenous extremity has not been disclosed. According to this invention, a freezer pad is provided by which primary and secondary coolant circulated at sub-zero temperatures for a sufficient time will to completely freeze the gangrenous part of the limb and thus the complete physiological amputation of the extremity before the surgical one To accomplish amputation.

As a result of the fact that the coolant from a cooling source through Elongated flexible tubes are fed to the patient with a certain limited ambulation provided, it will give him freedom of movement in bed from either sitting, lying, or stretched position, or is permitted even allowed him to get out of bed and, if desired, sit in a chair.

Furthermore, if the limb is completely frozen, the temperature may can be set to a holding temperature in the freezer area and the patient held in this state for periods of as long as a week or more, while supportive procedures are initiated to keep the patient in the state for bring surgical approach.

Referring now to the drawings, Figure 1 is a schematic illustration a cooling component that is used to supply a secondary coolant to a preselected one Freezing temperature to cool, which coolant is then pumped to the freezer pad or the cuff of the present invention is turned over. Figure 2 is a different one schematic illustration of a coolant system used to supply primary To supply coolant to a freezer cuff or pillow and in which the liquid and the compressed coolant directly into the flexible and meandering pipeline is expanded, which forms the cooling part of the freezer pillow.

The cooling component is now referring to the drawings in detail illustrated schematically and denoted by the reference numeral 1. It consists from a motor-driven compressor 2, a cooling coil 3, a high-pressure line 4 going from the condenser coil to an expansion valve 5 0 the evaporator coil 7, which surrounds the tank 20, leads through to a low-pressure or suction line 8 contains the suction port 10 back to the compressor 2o As previously indicated, the Tank 20 for the secondary coolant 21 in this case 95% alcohol, although others secondary coolants can be used. A thermometer 22 is in the tank 20 is used on the top, as is a probe 23 for the liquid level is. The liquid coolant 21 is pumped from the tank 20 via the line 24 25 supplied and is returned through the return line 27, which in connection works with the thermostat 28 and in a vertical outlet branch 29 in the Tank ends. The outlet line 30 from the pump 25 is fed through the line 26 and goes to a solenoid valve 31, which, when opened, is at minus temperature located alcohol solution freeze 21 through line 32 to the flexible Tube 34 supplies, connected together by a quick-release coupling 33 ist0 The flexible tube 34 is of course located outside the cooling component and is therefore preferably covered with a flexible Wisdertemperature insulation 35, for example, an expanded NeRoprene known commercially as Armoflex. The flexible tube 34 is by means of a quick disconnect coupling 50 to the inlet opening 47 of the selected pipeline 43 connected to the freezer pad 40 via the inlet port 47 of the selected pipeline 43, which is the cold or cooling part of the freezer pillow forms. The freezer pad 40 consists of an outer layer 41 of waterproof Material and an inner layer 42 of waterproof material, which is in the Drawing has been moved to illustrate its construction. The chosen one Pipeline 43 consists of a series of parallel lengths 44 running along the length of the freezer pillow 40, which are reinforced at the curvature 45. The outlet opening 48 is via a quick-release coupling 51 with the flexible return pipeline 52 connected, which in turn by a quick-release coupling 53 with the return line 54 is connected. A thermometer 55 is illustrated next to the return line 54 and the solenoid valve 56 controls the flow of the returning liquid through line 57 back to the secondary coolant tank 20.

It will thus be seen that a coolant device is provided which for use in cooling a tank of secondary coolant to pqinus temperatures is suitable to freeze selected parts of the extremity of the Patient to allow.

The patient's foot and leg are placed in the freezer pad 40 and the pillow is pulled up around the foot and leg and with a tie strap tied up. Additional insulation in the form of polyurethane foam or other Materials can be wrapped around the pillow 40 to avoid loss of freezing capacity to prevent. The freezer is then set to a freezing temperature in the area from minus 50 to minus 40 ° C and the cooling component is switched on. As soon as the component provides sufficient cooling to anesthetize the extremity, a tourniquet is placed over the top of the freezer pillow 4U.

Thus, through the use of the stamina and through the complete Freezing the limb increases circulation between the limb and the rest of the limb Body completely interrupted. Thus it becomes a complete physiological amputation that part of the leg attacked o After that, the temperature may be affected by the freezer pad circulating liquid at a holding temperature of approximately in the range of between 0 to -10 ° C and the device will automatically operate without further nursing Continue. It is then only necessary to check the device from time to time and to begin a supportive process for the patient in order to support him for the subsequent to strengthen surgical amputation. In many cases, the patient gains sufficient Strengthening as soon as the circulation of toxins is shut off from the gangrenous area so that an operation can be planned within a few hours.

Even so, it is possible for the patient to have up to one in this condition Week or longer while allowed through supportive therapy To get strengthening. During this time the patient can sit up, roll over, can move around, can get out of bed, can do his own toilet and can sit in a chair without special help from the sister.

#un illustrates referring to a second modification of this invention Figure 2 shows schematically the use of a primary coolant as the circulating Liquid in the freezer pad 40 of the invention. The conventional cooling device is shown again and consists of a compressor 2, the cooling coil 3, the high pressure line 4, which in this case by a coupling 59 to the flexible high-pressure pipeline 60 goes. It is noted that this tubing is near its distal extremity Has expansion valve 65, which then ends in a quick-release coupling 66. Because the pipeline is at a slightly high pressure i.e. about 45.4 kb (101.2) preferably reinforced. Furthermore, since the pipeline may be hot, it is possible apply high temperature insulation, generally designated 7D, in order to protect the personnel from being burned by contact with the pipeline 60.

When the hot and compressed coolant passes through valve 65 in the inlet opening 47 of the corrugated pipe 43 is expanded, the evaporates Coolant and causes an immediate freezing temperature in the area that is required for rapid freezing of the gangrenous extremity. The outlet opening 48 of the evaporation pipeline 43 is seated via a quick-release coupling 67 Low pressure or suction line 68 connected in the form of flexible pipe 68, which is again covered by a low-temperature resistant insulation 35, such as for example the aforementioned Armoflex® The flexible return suction line 68 goes through the coupling 69 back to the low-pressure or suction line 8 of the compressor and through the low pressure port 10 to the compressor for recompression and Condensation through the cooling coil 3.

It will be particularly evident in the field that I have a powerful, almost completely automatic method of freezing gangrenous extremities intended as a preoperative treatment for surgical amputations. The procedure switches damp and dirty dressings with constant nursing care that were previously experienced from the use of ice packs. Since the Coolant tubes supplying the freezer pad are flexible, will benefit the patient considerable mobility and self-limited ambulation during the preoperative Treatment period. . - Many modifications will be made to those skilled in the art from the above detailed description, and the description is cited as an example and not limited, unless it stands in the field consistent with the appended claims.

Claims Blank page egg

Claims (1)

Cerat for providing cold anesthesia and for constant freezing of an extremity to complete physiological amputations of the extremity for To effect preoperative treatment of a gangrenous extremity, g e k e n n Z e i c h n e t d u r c h: a. a refrigeration component that includes a compressor (2) in operable relation with a cooling coil (3) on one side and in operational relation with a low pressure opening on the other side to the Receiving recycled gaseous refrigerant includes b. a flexible high pressure line in connection with the cooling coil (#) c. an expansion valve (#) d. a flexible one Niederdruckleitunrj: in operative connection at its near end with the low pressure port the compressor (2) e. a freezer pad (40) including inner and outer layers and a corrugated pipe interposed between the layers and the covered most of the area of the pillow, with the corrugated tubing inlet and outlet Outlets that protrude on the outside of the freezing pillow: f.eine Connection arrangement, whereby the inlet opening of the corrugated pipeline with the Cooling component is connected to coolant for circulating the same through the corrugated To maintain pipeline at sub-zero temperatures and 9. a connection arrangement to the Connect the Outlet opening of the corrugated pipeline with the cooling component to recirculate the coolant to the component.