Surgery – Truss – Pad
Patent
1989-01-17
1990-07-03
Sykes, Angela D.
Surgery
Truss
Pad
128686, A61B 5022
Patent
active
049382268
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention refers to a method for measuring blood pressure and an apparatus for carrying out the method. More in detail the invention refers to a method for measuring the blood pressure in such a way that the point of measuring is focused by means of a new cuff. Moreover, the apparatus according to the invention comprises a valve system which makes a carefully controlled air outflow possible.
PRIOR ART
A previously known apparatus for measuring the blood pressure with outside arranged accessories consists of a cuff which is connected to a manometer and an air hand pump with an air vent screw.
Today, measuring the blood pressure is the most common examination of all clinical tests performed by a physician. At least 10% of the adult population of Sweden is today treated for hypertonia, i.e. too high blood pressure. However, at least 25% of all persons are malpracticed due to an incorrect hypertonia diagnosis, especially due to erroneously performed blood pressure measuring. Furthermore, the cuff may cause such a pain that the blood pressure is raised during the measuring. A great amount of literature has been collected during the last 10 years.
The disadvantages with the present cuffs available on the market may be concluded according to the following: the cuff, i.e. an extended "point of measuring", way,
3. the "object of measuring" may be thin, medium or coarse, which entails that several different sizes of cuffs are used, the cuff the artery has allowed the blood stream to pass.
The difficulties in using said air vent screw on the air hand pump are:
2. that it does not give a continuous air outflow during the measuring due to the difficulty in finding the right position for the screw,
3. that it often gives employment injuries in the forefinger and thumb of the hospital staff, who are working continuously with measuring blood pressures at blood pressure centres and within medical attendance in general.
SUMMARY OF THE INVENTION
The invention comprises two devices, each separately constituting a new measuring instrument within the medical attendance for measuring blood pressure at hospitals, blood donation centres and elsewhere, where measuring blood pressure is involved in a routine for determining a person's blood pressure.
The first novelty is that the cuff consists of two parallel, inflatable intercommunicating rubber cushions. When air is inflated the cushions will grow in a radial and tangential direction towards each other. Thereby two fields of force are achieved, which are directed obliquely inwards against an extremity enclosed by the cuff and at the point where these cross each other an artery is positioned. This is squeezed towards the skeleton of the extremity so that the blood ceases to flow through and the so-called Korotkoff-sounds or the pulsation are not perceptible downstream the squeeze. The coarseness of the extremity is of less importance with this cuff, which eliminates one problem for the hospital staff.
The second novelty is the embodiment of the valve system.
The cuff is connected to a valve system with a rubber hose. An air hand pump is also connected to the valve system, i.e. through the valve system a tube is running, which partly transports the air from the air pump to the cuff, partly discharges the air from the cuff via two small channels placed across the tube.
Said two small channels are of different sizes and each of them is closed by means of a rubber coated piston, each one giving the air required outflow. Each of the pistons are operated by means of a button. There is a smaller channel for slow, continuous emptying, and a bigger channel for rapid emptying, when the measuring is accomplished.
When the rubber cushions are inflated to a pressure which prevents the blood to pass the Korotkoff-sounds are inaudible downstreams the squeeze. Air is now released by a press on the first button, which lifts the rubber coated piston and the smaller channel opens and a distinct, continuous air outflow starts. After a certain period of time, as the pr
REFERENCES:
patent: 3118440 (1964-01-01), Dobbeleer
patent: 3741199 (1973-06-01), Sharpe
patent: 3954099 (1976-05-01), Raczkowski et al.
patent: 4037587 (1977-07-01), Kaneda et al.
patent: 4210154 (1980-07-01), Klein
patent: 4634434 (1987-06-01), Marino, Jr. et al.
Coger Hans
Danielsson Per
Henningsen Nels
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