Method and apparatus for improved fetus contact with fetal probe

• US 5,377,675 A
• Filed: 06/24/1992
• Issued: 01/03/1995
• Est. Priority Date: 06/24/1992
• Status: Expired due to Term

• Current Assignee: Nellcor Puritan Bennett Incorporated (Medtronic Plc)
• Original Assignee: Nellcor Incorporated (Medtronic Plc)
• Inventors: Ruskewicz, Stephen J., Casciani, James R.
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US07/904,418
• Time in Patent Office: 923 Days
• Field of Search: 128/633, 128/634, 128/664, 128/665, 128/642, 128/670, 128/698, 128/639, 604/281
• US Class Current: 600/341
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1464 specially adapted for foetal tissue
• CPC Class Codes: A61B 5/6852 Catheters
• CPC Class Codes: A61B 5/6855 with a distal curved tip

Abstract

The present invention provides a method and apparatus for improved fetal contact with a fetal probe. The easily insertable probe includes a means for adjusting the position of the probe so that a sensor makes firm contact with the fetus. In one embodiment, the position is adjusted via a biasing segment of the probe which rotates about a fulcrum. In another embodiment, the position is adjusted via a bladder.

Claims

1. An intrauterine probe for measuring a physical condition of a fetus comprising:

a sensor body comprising an active face, wherein the sensor body has a channel disposed therein;

inserting means for inserting the sensor body into a uterus between a fetus and a uterine wall;

a normally deformed resilient biasing means integral with the sensor body and which is disposed entirely on the portion of the probe within the uterus for applying force between the fetus and the uterine wall; and

straightening means for straightening the resilient biasing means, the straightening means including a stylet removably disposed in the channel.

2. The probe of claim 1 wherein the resilient biasing means extends distally from the distal end of the active face and the inserting means extends proximally from the proximal end of the active face.

3. The probe of claim 1 wherein the resilient biasing means extends distally from the distal end of the active face at an acute angle from the plane of the active face and the inserting means extends proximally from the proximal end of the active face.

4. The probe of claim 1 wherein the resilient biasing means extends from a lateral edge of the active face.

5. The probe of claim 1 wherein the resilient biasing means extends from both lateral edges of the active face.

6. The probe of claim 1 wherein the resilient biasing means comprises at least one flexible protrusion.

7. A method for measuring a physical condition of a fetus comprising the steps of:

providing a sensor having a normally deformed resilient portion and an active face;

inserting the sensor into a uterus such that the active face is adjacent the fetus and the resilient portion is entirely within the uterus;

temporarily straightening the resilient portion while inserting the sensor into the uterus; and

permitting the sensor to apply a force between the active face and the fetus using only the normal deformation of the resilient portion and without the application of any additional force from outside the uterus.

8. The method of claim 7 wherein the straightening step further comprises the step of inserting a stylet into the sensor.

9. The method of claim 8 wherein the permitting step comprises removal of the stylet from the sensor so that the resilient portion tends to return to its normally deformed state.

10. An intrauterine probe for measuring a physical condition of a fetus comprising:

a sensor body having a longitudinal axis and an active surface for contacting a fetus;

inserting means for inserting the sensor body into a uterus between a fetus and a uterine wall; and

a first biasing segment extending from a rotation point on the sensor body, the first biasing segment being preformed and normally extending at a predetermined nonzero angle from the sensor body and being resilient for rotation about the rotation point.

11. The probe according to claim 10 wherein the first biasing segment terminates in a free end and functions as a lever for biasing the active surface toward the fetus when the sensor body is inserted between the fetus and the uterine wall.

12. The probe according to claim 10 further comprising straightening means for straightening the first biasing segment.

13. The probe according to claim 12 wherein the straightening means comprises means for straightening the first biasing segment.

14. The probe according to claim 13 wherein the sensor body includes a channel, and wherein the straightening means comprises a stylet removably disposed in the channel.

15. The probe according to claim 10 wherein the first biasing segment extends distally in the direction of the longitudinal axis.

16. The probe according to claim 15 wherein the first biasing segment extends distally from a distal end of the active surface, and wherein the insertion means comprises a handle extending proximally in the direction of the longitudinal axis from a proximal end of the active surface.

17. The probe according to claim 16 wherein the first biasing segment has a corrugated shape.

18. The probe according to claim 15 wherein the first biasing segment has a normally curved shape.

19. The probe according to claim 18 wherein the first biasing segment has a tapered shape.

20. The probe according to claim 10 wherein the first biasing segment extends generally perpendicularly to the longitudinal axis for rotation about the longitudinal axis.

21. The probe according to claim 20 further comprising a second biasing segment extending opposite the first biasing segment generally perpendicularly to the longitudinal axis.

22. The probe according to claim 10 wherein the sensor body has an opposite surface for facing the uterine wall, the opposite surface including a slot, and further comprising a second biasing segment connected to the first biasing segment and disposed generally parallel to the slot for deflecting into the slot when the sensor body is inserted between the fetus and the uterine wall.