Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1997-07-17
1999-02-02
Nasser, Robert L.
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
600351, 600376, 600511, A61B 500
Patent
active
058657371
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a sensor device for measuring the vital parameters of a fetus during birth.
2. Field of the Invention
A sensor device for measuring the vital parameters of a fetus is known, for example, from German patent DE 38 100 08. Such a sensor device includes a sensor, a placement device for placing the sensor on the leading part of the fetus, and a measuring device connected to the sensor, whereby the sensor has on its front side facing the fetus and, arranged in the center of the sensor, a wire spiral for attaching the sensor to the fetus, and at least one light emitter and at least one receiver which are connected by way of conductors with the measuring device, said conductors arranged in a cable branching off the sensor towards the measuring device.
In this known sensor, the cable exits the sensor through the back of the sensor on the opposite side of the wire spiral, approximately in the direction of the main axis of the wire spiral.
Praxis has shown that usable signals can be received reliably only when the sensor is in tight contact with the tissue of the fetus for the duration of the birth. But during birth, a rotation of the fetal head frequently causes the sensor to move below the cervix.
In the process, the cable is bent and thus exerts a tilting moment on the sensor, possibly having an adverse effect on its attachment to the fetus. This risk is increased if in addition a pull is exerted on the sensor via the cable. Actually, such a risk already exists during the placement of the sensor.
SUMMARY OF THE INVENTION
The present invention is based on the task of constructing a sensor device of the above mentioned type in such way a that the functions of the sensor are safely attained during its placement and are safely maintained during birth, regardless of any relative movements between the fetus and the mother.
In order to realize this objective, the invention provides that in such a sensor device the cable is introduced laterally, and essentially tangentially, into the back of the sensor and extends in front of the insertion in a helical partial winding, e.g., in a plane that extends more or less vertically to the axis of the wire spiral.
This measure makes it possible that the cable spiral, i.e., the partial winding on the back of the sensor, is able to slip underneath the cervix in an essentially flat position together with the sensor, while no tilting moment is exerted on the sensor. Any pulling on the cable during the process, or even during the sensor placement, will not prevent the secure placement of the sensor or its reliable attachment to the fetus during birth, independent from any relative movements between mother and fetus, since the springy, resilient partial winding of the cable spiral always prevents an adverse pulling action on the sensor. In order to retain the partial winding of the cable spiral in its flat position without adversely affecting the above described advantages, the partial winding of the spiral can be held on the sensor back in an easily releasable manner, e.g., in a groove or by way of a point attachment at a clamping point with an easily releasable clip. The retention force can be kept so low that, in the case of a possible adverse pulling on the cable, the partial winding of the cable spiral is released. However, the partial winding can also be kept in its position by being constructed in a resilient rigid construction.
This may also be an additional measure.
In order to attain a reliable attachment of the sensor device on the fetus during its placement, the placement device of the sensor device may, in a known manner, have a guide tube with a screwdriver for rotating the sensor guided inside it, whereby the cable coming from the sensor is guided through the guide tube, but whereby this placement device according to the invention can be further developed in such a way that the front end of the guide tube has a chalice-like receptacle that holds both the sensor and the partial winding, whereb
REFERENCES:
patent: 4658825 (1987-04-01), Hochberg et al.
patent: 4913151 (1990-04-01), Harui et al.
patent: 5154175 (1992-10-01), Gunther
Knitza Reinhold
Rall Gerhard
Nasser Robert L.
Winakur Eric F.
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