Fetal electrode product

• US 4,934,371 A
• Filed: 05/12/1989
• Issued: 06/19/1990
• Est. Priority Date: 02/09/1988
• Status: Expired due to Fees

• Current Assignee: Corometrics Medical Systems, Inc.
• Original Assignee: American Home Products Corporation (Pfizer Inc.)
• Inventors: Malis, Michael J., Neagle, Gilbert J.
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): Lacyk, John P.
• Application Number:
  US07/351,609
• Time in Patent Office: 403 Days
• Field of Search: 128/639, 128/640, 128/642, 128/785, 128/802, 128/786, 128/784, 128/419 P, 604/198
• US Class Current: 600/386
• CPC Class Codes: A61B 5/288 for foetal cardiography, e.g. scalp electrodes
• CPC Class Codes: A61B 5/4362 Assessing foetal parameters

Abstract

A fetal electrode product comprises a guide tube, an electrode assembly having a spiral electrode extending from its forward end and a flexible drive tube extending through said guide tube adapted to engage said electrode assembly for axially moving and rotating said spiral electrode. A safety sleeve is retained on the forward portion of the electrode assembly to protect the doctor and mother from the pointed end of the spiral electrode before, during and after the electrode is removed from the fetus during birth.

Claims

1. A fetal electrode product for attachment to a fetus, comprising:

a guide tube;

an electrode assembly having a holder member with a rearward end and a forward end and a spiral electrode extending in a forwardly direction from said forward end;

a flexible drive tube extending through said guide tube and adapted to engage said electrode assembly for axially moving said holder member and for rotating said spiral electrode; and

a safety sleeve having an outer casting adapted to envelop said holder member and move axially relative to said holder member between a first position, where the casing is fully extended to sheath the spiral electrode and holder member, and a second position, where the casing retracts from the first position allowing the spiral electrode to be attached to the fetus while continuing to sheath the holder member, said safety sleeve further including a means for biasing said outer casing toward said first position.

2. A fetal electrode product as in claim 1 wherein the biasing means includes a spring coiled around the holder member.

3. A fetal electrode product as in claim 2 wherein the forward end of the holder member has a shoulder, the rearward end of the holder has a groove, and further including a snap ring which is secured within the groove.

4. A fetal electrode product as in claim 3 wherein the safety sleeve has an inner surface, and said inner surface has an annular projection which extends substantially orthogonally from said inner surface.