DE2416479A1 - FLOATING OR AIR MATTRESS FOR MEDICAL PURPOSES - Google Patents

Description

DR.-ING. G. RIEBLING ic / 70 PATENT ADVOCATE I ^ IDH / V

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My sign

H 1452-14 / lyle

Please repeat in the answer

J
your message from 899 Lindau (Lake Constance)

Rennerle 10 P.O. Box 3160

April 2nd 1974

Hoiuorth Air Conditioning Limited Uictoria Works,

Lome Street, Farnujorth, Bolton / County of Lancaster -England-

Floating or air mattresses for medical purposes

This invention relates to improvements in levitation or suspension systems Low loss air mattresses for medical use of the type described in British description IMr. 1 139 describes in which the patient is supported on an air cushion if he suffers from severe burns, However, this construction has been found to work satisfactorily only as long as the Patient not moving.

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Bank accounts: Postal check account:

Bayer. Vereinsbank Lindau (B) No. 1562 Munich 295 25-809

Bavarian Mortgage and Exchange Bank Lindau (B) No. 278 920

Telephone Teletype Speaking time: Lindau (08382) 6917 054374 by appointment Kfz .: Fu 2581897

This earlier bed is an inflatable chamber with an outlet formed by a number of pockets which are inserted into three levels are self-adjusting. As each bag puffs up, it is pressed against its neighbor and touched also along the center line of the bed and along the center line of each leg the opposite pockets. After the patient is placed on the inflated bed, the pressure is adjusted so that the pockets through the Downward pressure on the body is sufficiently depressed, to allow pressurized air to escape between the body and the upper surface of the pouches " Gene parts of the pockets under the body are subjected to the same pressures on their inner and outer surfaces and fall away from the patient while those parts outside the body profile remain inflated.

According to the invention, a control system for an air support- Floating bed to maintain an essentially constant air pressure in its pockets, which form a mattress, characterized by an air line for supply the pockets, a gate valve or a valve in the line to open and regulate the supply of air, so that the air is regulated to counter the weight of various patients, such as children and adults to act and an arrangement, once this balance has been established, to the equilibrium

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automatically maintain even if the escape the air is varied as a result of the patient's movement; a pressure tap or a pressure sensor to detect a change to determine the air pressure in the pockets, a pneumatic, electric or electropneumatic pressure-regulating and compensating equipment, calibrated to the weights of the patients, who are supplying compressed air to one controls the pneumatic cylinder, the piston of which actuates an articulated joint, to close the gate valve or valve in the required position Maintain a position and achieve the correct constant air pressure to support the patient's weight support and open the butterfly valve or valve when there is a pressure drop as a result of the patient's movement in enters the pockets of the bed and returns to the required holding pressure as soon as the patient moves has stopped.

The invention is described in detail with reference to the accompanying drawings.

It shows:

Fig. 1 is an end view of a bed;

Fig. 2 is a part of a side view of the same, the schematic represents a control circuit therefor;

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3 shows a similar view of a further control circuit arrangement j

Figure 4 is a similar view that includes a safety circuit.

A floating air mattress A is made up of a number of pockets yes formed with open ends forming a mattress that extends from both sides of the bed frame to towards the longitudinal axis of the bed meet. Air is from a duct A an annular

1 chamber supplied, which is designed as a shell and yes the pockets _a surrounds. The air flows into the pockets yes the outer ends of which are connected to the shell. The air inflates the pockets _a on each side of the breast, and uienn every bag is inflated, it will be against its guardian pressed and also meets the opposite pocket along the central longitudinal axis of the bed.

A control of the air supply is provided to prevent excessive leakage of air from the pockets and the subsequent To compensate for loss of floating pressure when moving a patient on the bed the equilibrium of air pressure messes up in the pockets.

The air supply to line A under a pressure of

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0.1524 m and 0.381 m (6 and 15 inch) water column is through a shutter or a throttle valve controlled by a piston in a pneumatic cylinder 2 via a joint 3 can be actuated .. Compressed air at 1.41 kp / cm (20 p.s.i.) is fed directly to a container 4 and also indirectly via a throttle valve 6 and a step-wise one Switch to the container. Compressed air from the throttle valve 6 is connected to a static differential pressure transmitter 5 connected, which scans the change in air pressure via a pipe 7 small bore, which is a static Tap 8 is connected. The air support or floating bed is supplied by a remote air supply system with sterile, conditioned air supplied. The air pressure on the bed is adjusted according to the patient's weight. The right one Air pressure for the weight of the patient is selected by a variable control valve 9, which the transmitter 5 allows compressed air to be released from the throttle valve 6, which in turn allows the compressed air to be returned to the container reduced. The tank 4 automatically sets the correct pressure of the compressed air to feed the cylinder, and this moves the flap 1 into the correct one Position to maintain constant air pressure on the bed to obtain. Any drop in air pressure on the bed as a result of the patient's movement is immediately addressed by the static air pressure tapping 7 and the transmitter 5 supplied, which more compressed air from the throttle valve 6

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drains, which then the return of the compressed air to the Container 4 reduced. The container 4 automatically reduces the supply of compressed air to the cylinder 2, which in turn the flap 1 opens and allows more air to be supplied to the bed, thus providing the necessary levitation. restore pressure.

In an alternative arrangement in FIG. 3, a variable control feeds compressed air at a maximum pressure of 1.41 kp / cm (20 p _o si) via a solenoid valve 10 to the cylinder . The neutral line is connected directly to the solenoid valve 10 and the line supply passes through a normally closed micro switch 11 within an air pressure switch 12 before being connected to the normally closed solenoid valve. The air pressure switch 12 is connected to the static pressure tap 8 by a pipe 13 with a small bore and opens the valve. This sequence allows compressed air to escape from the cylinder 2, which opens the shutter 1 or the valve.

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The bed's air support system is remote Air system supplied with sterile conditioned air. Of the Air pressure on the bed is adjusted according to the patient's weight and varies from 0.1524 m to Q.381 m (6 to inch) water column. The correct air pressure for the patient's weight is selected with the variable control, which allows the correct pressure of compressed air to be supplied to the cylinder 2, which in turn adjusts the flap 1 to the correct floating position. The compensating air pressure switch 12 is preset to operate at air pressures below the normal operating range required for hovering the Patient is required. If the patient moves excessively in a floating state, this allows more air to escape past the patient and consequently the pressure in the bed is lowered and the patient begins to sink into the bed until the pressure in the bed reaches the air pressure switch's set setting »This immediately opens the Hilikro switch 11 within the ijruckschalters and opens the solenoid valve 10, the Compressed air releases in the cylinder 2, which in turn opens the shutter 1 to supply full air to the bed. This gives maximum pressure in the bed and automatically raises the patient to the original setting the variable control. The pressure switch 12 will close the micro switch 11 when the pressure in the bed is over

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the set setting increases, thus creating a condition to restore the equilibrium.

In the arrangement shown in Fig. 4, a safety feature is included to prevent the patient from being To drop the bottom of the bed, use the compensating, pneumatic Mechanism works too slowly to withstand sudden violent movement.

An electric pressure switch 15 and a solenoid valve 16 are provided, the pressure switch having an adjustable range and being on a pressure, floating beneath that which is required to make the patient to keep. UIf the patient reacts violently and the pneumatic system does not compensate in time, then stop the electric pressure switch 15 immediately detects the drop in pressure and immediately energizes the solenoid valve 10, which in turn empties the control cylinder 2 of the flap and full volume of air on the bed permitted. This reaction lifts the patianise to the top of the bed and allows the pneumatic system to operate To take over the control function of the normal floating pressure.

Claims

Claims (5)

Claims !. 'Control system for air-cushion, support and floating beds of the type listed, to an essentially constant one To maintain air pressure in the pockets forming a mattress, characterized by a Air line (A) for supplying the pockets (ji); a shutter (1) or valve in-line to close the air supply open and regulate so that the air is regulated to the weight of different patients, ujie for example children and adults, to counteract and make an arrangement to automatically maintain balance as soon as this balance has been established even if the air leakage varies due to patient movement will; a pressure tap (8) or a sensor to detect a change in the air pressure in the pockets (a); a pneumatic, electrical or electropneumatic ^ pressure-regulating and compensating system that works on the weights the patient is calibrated to control the supply of compressed air to a pneumatic cylinder (2), its piston a hinge (3) operated to hold the flap (1) or the valve in the required position and the correct constant air pressure to support the patient's weight and the locking flap (1) or to open the valve when there is a pressure drop in the pockets 409846/0710 -10- (a) the bed enters as a result of patient movement and return to the required holding pressure as soon as the patient has stopped moving. 2. Control system according to claim 1, characterized in that the. Air supply to the Cylinder (2) through a direct control tank controlled by a static differential pressure transmitter (5) actuated by the sensor. 3. Control system according to claim 1, characterized in that the air supply to the Cylinder (2) controlled by an electromagnetic valve (16) via a pressure switch (15) actuated by the sensor will. 4. Control system according to claim 1 or 2, characterized in that a throttle valve (6) in the air supply to the pressure transmitter (5) is installed. 5. Control system according to claim 1, characterized in that an electrical pressure switch (15) and a second solenoid valve (16) are provided to detect a pressure drop in the bed and correct as soon as the patient moves and causes the pressure in the pockets (a) to drop. 409846/071 Q