Noninvasive blood-pressure measuring device

Abstract

The invention relates to a measuring device for continuously determining the intra-arterial blood pressure in two fingers of a hand, which measuring device comprises a base part and a cuff part, which can be connected to the base part without using tools. For each of the two fingers, a light source (23a, 23b) for near-infrared light and a photodetector (24a, 24b) are provided, which are arranged on a common circuit board (4). By means of respective light pipes (27), i.e. optical waveguides not in the form of fiber bundles, the light sources (23a, 23b) and the photodetectors (24a, 24b) are connected to an associated optical emission surface (25a, 25b) and an associated optical collector surface (26a, 26b), respectively, in order couple emitted light into the finger tissue and to couple unabsorbed light out of the finger tissue, respectively. At the interface between the cuff part (8) and the base part (18), the cuff-part segments and base-part segments of the light pipes (27) are interconnected by means of optical contact points (28) that can be disconnected. On the base part, a cover glass piece (29), e.g. mineral glass piece or sapphire glass piece, that is flush with the housing (2) of the base part (18) and that is as scratch-resistant as possible is mounted at each of the contact points.

Description

technical field [0001] The invention relates to a non-invasive blood pressure measuring device, in particular a measuring device for continuously determining intra-arterial blood pressure on at least one finger of the hand. Background technique [0002] The (in particular arterial) blood pressure of a patient is one of the most important measurement variables in medical technology, and the associated measurement techniques, in particular non-invasive measurement techniques, are known to be extremely diverse. This applies in particular to measurement techniques for continuous monitoring of blood pressure over longer periods of time (eg in intensive care medicine), but also in emergency medicine and during surgery. [0003] For reasons of good accessibility, blood pressure measuring devices are often attached to the patient's extremity, for example an applanation tonometer sensor in the radial artery of the forearm or a photoplethysmographic operation based on the so-called va...

AI Technical Summary

Problems solved by technology

[0018] Typically, prior art pressure generation and pressure control systems are attached to the distal forearm, close to the wrist, which has significant disadvantages: this point is often used for intravenous injection; moreover, intra-arterial access at the distal end of the radial artery is critical in emergency unobstructed

When LEDs and photodiodes are arranged in reusable sections, there is a problem that exposed light emitting elements must be cleaned and sterilized before they can be reused

On the other hand, when the light emitting diode and the photodiode are arranged in the disposable part, there is a problem that an electrical connection must be provided between the disposable part and the reusable base unit, and the production cost of the disposable part increases

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