Surgery – Diagnostic testing – Cardiovascular
Reexamination Certificate
1999-06-16
2001-01-09
Nasser, Robert L. (Department: 3736)
Surgery
Diagnostic testing
Cardiovascular
C460S049000, C460S049000
Reexamination Certificate
active
06171255
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to a device for noninvasive blood pressure measurement including a pneumatic cuff wherein the pneumatic cuff is placed around an extremity of a patient and the pressure is determined by a device with a pressure gauge and the pressure is subsequently evaluated.
BACKGROUND OF THE INVENTION
Such a device has been known, e.g., from EP 0 829 227 A2. The pneumatic pressure in a cuff around an extremity of a patient is determined by means of such a device with a pressure gauge and subsequently evaluated. Important requirements imposed on such devices for practice include flexible handling, robustness and measurements not affected by external disturbances. External disturbances usually originate from mechanical effects on the pneumatic system of the measuring device, which comprises, in general, the elements cuff, pressure sensor, pump, valve, and pneumatic connection lines.
Mechanical effects on the pneumatic system, especially on the flexible pneumatic connection lines, are due, in particular, to movements of the patient and cause disturbing signals. However, these signals are not physiological and therefore lead to incorrect measurement results or even to an interruption of the measurement. It has therefore been suggested that such disturbances be compensated by numerical processes, but such processes are complicated and have ultimately no effect on the mechanical causes proper of the disturbances.
SUMMARY AND OBJECTS OF THE INVENTION
The primary object of the present invention is to provide an improved device for noninvasive blood pressure measurement, which extensively reduces the effect of external disturbances on the pneumatic system of the device.
According to the invention, a device for noninvasive blood pressure measurement is provided with a pneumatic cuff connected to a multisensor block means (i.e. a unit with a senor and a connection for another sensor)via a pneumatic connection line. At least one sensor is provided sending electric output signals for the measurement of physiological parameters. The sensor is connected to the multisensor block by means of an electric connection line. The multisensor block is connected to an evaluating and supply unit by means of a single hybrid cable containing a gas-carrying line and at least two electric lines.
The gas-carrying line and the electric lines, of which there are at least two, preferably form the hybrid cable with a common outer sheath, which is not elastic in the longitudinal direction. The gas-carrying line preferably covers the geometric center of the hybrid cable.
The gas-carrying line and the electric lines, of which there are at least two, may be twisted in the sheath with a twist cycle of 50 to 300 mm.
The sheath itself or a part of the sheath may consist essentially of a fiber-reinforced material or a composite, especially a synthetic fiber-reinforced composite, carbon fiber-reinforced composite or ceramic fiber-reinforced composite.
The multisensor block may be provided with a pneumatic plug-and-socket connection for the pneumatic connection line. The multisensor block may also be provided with an electric plug-and-socket connection for at least one electric connection line.
An important advantage of the present invention arises from the fact that a substantial improvement of the measurement results is achieved with simple design means in the area of the pneumatic system of the device. An important and advantageous feature of the present invention is a special hybrid cable, which contains a gas-carrying line and at least two electric lines and connects a multisensor block to an evaluating and supply unit.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
REFERENCES:
patent: 4475557 (1984-10-01), Hatchek et al.
patent: 4987900 (1991-01-01), Eckerle et al.
patent: 5343869 (1994-09-01), Pross et al.
patent: 5568814 (1996-10-01), Gallant et al.
patent: 0 829 227 A2 (1998-03-01), None
Ise Edgar
Kemper Pieter W. J. M.
Landowski Christoph
Dr{umlaut over (a)}ger Medizintechnik GmbH
McGlew and Tuttle , P.C.
Nasser Robert L.
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