Other

Gerhard Rall

Reinhold Knitza

Karl Hertel

Gunther Hertel

Hermann L Kastner

The invention relates to a sensor device as part of a measurement appliance with a measurement device for the measurement of vital parameters of a foetus during labor and delivery, in particular the oxygen content of the blood of the foetus. Such sensor devices should be applied to the tissue of the foetus in a secure and light-tight manner, and furthermore at least the carrier or sensor should be able to be fitted to the foetus gently and easily. According to the invention, the sensor device comprises a shell-type carrier, which is subdivided into an approximately centrally arranged attachment zone and a surrounding zone, which can be brought into contact with the tissue of the foetus, and the attachment zone is provided with a spiral-type attachment element for attaching the carrier to the leading part of the foetus, and the rotational axis of the attachment element is arranged approximately perpendicular to the surface of the carrier to be fitted to the leading part of the foetus. The surrounding zone comprises at least one light emitter and at least one receiver, whereby the attachment element is supported for rotation with respect to the surrounding zone.

Sensor device for measuring vital parameters of a fetus during birth

Use of a pulse oxymetry sensor device

Sensor device for measuring the vital parameters of a fetus during birth

Process and device for measuring vital fetal parameters during labor and

A sensor device used as part of a measurement device with a measurement unit for measuring vital parameters of a fetus during labor and delivery. The sensor is attached to the presenting part of the fetus for the duration of labor and delivery. In order to prevent the arterial blood flow in the fetal tissue at the measurement point from being impaired by attachment of the sensor to the fetal tissue, the sensor has an approximately round, curved cup which forms a concavity on its concave side and is subdivided into an attachment zone at the center and an elastic peripheral zone surrounding it where the light emitter and receiver are arranged, whereby the peripheral zone of the cup attached to the fetal tissue rests in a flexible, spring-loaded manner on the fetal tissue.

Sensor device for measuring vital parameters of a fetus during labor and

The collect (20) is composed of a foundation body (21) and a closer (22). The foundation body (21) can be connected to the tightening device of a machine tool. The closer (22) is divided into individual clamping jaws (38) which are connected to one another permanently by means of intermediate members made of a rubber-elastic compound. The foundation body (21) and the closer (22) are coupled to one another by means of a coupling device (24) which is positive in the axial direction and nonpositive in the radial direction. The coupling device (24) includes projections (42) arranged ont he closer part (22) and protruding radially outwards and a matching number of openings (48) on the foundtion body (21).

Collet

A chuck comprising a chuck body having guide surfaces, preferably in the form of the surface area of a hollow cone, is provided. Chuck jaws having a correspondingly conical guide surface rest against the surface of the chuck body and are secured to one another by means of rubber-elastic spring elements to form a work head. At the rear end of the work head, the chuck jaws have a circumferential groove which is engaged by an annular coupling part. The coupling part is joined to a coupling sleeve which, in turn, can be coupled to the draw-in device of a machine tool. The coupling part comprises a displacement lock which, in the locking position, limits the distance of displacement of the coupling part at a place at which the contact surfaces on the coupling part and the matching contact surfaces on the chuck jaws still radially overlap one another. In the release position of the displacement lock, the coupling part can be displaced forward in the axial direction so that the contact surfaces on the chuck jaws project from the overlap with the coupling part so that the work head can be removed and exchanged for another work head having a different gripping diameter.

Chuck for gripping a workpiece

A composite tool unit comprising a tool shank, a tool head a chuck, a drawbar which is slidable in the longitudinal direction of the tool shank and a pulling shank which projects from the tool head. The drawbar and pulling shank are engaged around by the chuck, which is disposed in the tool shank axially to slide between an opening position and a closure position. The tool shank comprises an inner conical face which tapers in the direction of the drawbar and co-operates with outer conical segments disposed on the clamping jaws. The zones of the drawbar 8 and pulling shank 8 of the tool head engaged around by the chuck have respective projections. The flank of the radial projection of the drawbar which is remote from the tool head registers in each position of the clamping jaws with radially inwardly extending projections thereof to transmit an axial pull to the clamping jaws, whereas the projection of the pulling shank in relation to the clamping jaw projections registers only in the closure position of the chuck. The tool head is pulled via the drawbar, the chuck and the pulling shank into a positive connection (Hirth-type serrations) with the tool shank.

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Munich, Germany

Gerhard Rall