Obstetric bonnet for assisting childbirth

• US 5,569,265 A
• Filed: 01/13/1995
• Issued: 10/29/1996
• Est. Priority Date: 09/06/1990
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Elliott, Byron D.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US08/372,606
• Time in Patent Office: 655 Days
• Field of Search: 606/123, 606/122
• US Class Current: 606/123
• CPC Class Codes: A61B 17/442 without pivotal connections, e.g. using vacuum

Abstract

Flexible, collapsible, dome or cylinder-shaped bonnet that provides a substantially airtight fit to a fetal head and utilizes frictional and internally-created vacuum forces for assisting childbirth. The bonnet is manually inserted and rolled over the cranium of the fetus, stopping short of the eyes and the ears. Friction and internally created vacuum forces are created when the bonnet is pulled, thus securing the bonnet to the fetus'"'"'s head and allowing orientation and delivery. The device is comprised of a dome or cylinder-shaped body made of a collapsible elastic material, an optional raised "lip" located on the exterior of the open end, and may have a mechanical extension attached to the closed end. System embodiments allow for the attachment to the exterior of the closed end grommets and/or mechanical extensions that will irreversibly stretch, lengthen, and expose warning alerts in the event that excessive longitudinal force is applied. The bonnet is a significant improvement because it allows a firmer grip on the fetus'"'"' head with less danger of damage to either the mother or the fetus. Thus traction and rotational forces may be safely applied to a fetus without the need to use forceps or hard suction cups.

Claims

1. An obstetric bonnet shaped to snugly encase a fetal head down to about eyes and ears, the bonnet being formed from a soft, flexible and substantially air-impermeable sheet of material, such that, when emplaced, the bonnet has frictional and substantially airtight adherence to the fetal head, the bonnet defined further as comprising a means for applying force to move a fetus and wherein the bonnet leaks when a predetermined stretching force is applied to the bonnet.

2. The obstetric bonnet of claim 1 further comprising a gauge for measuring the amount of force applied to the bonnet.

3. The obstetric bonnet of claim 1 defined further as comprising a fetal monitoring device.

4. The obstetric bonnet of claim 1 further comprising an oximeter or fetal scalp electrode.

5. The obstetric bonnet of claim 1 further comprising signalling means responsive to a predetermined longitudinal or rotational force.

6. An obstetric traction delivery apparatus, comprising:

a smooth, collapsible bonnet shaped to provide a snug fit to a fetal head down to about eyes and ears, said bonnet having an inner surface, an outer surface, an open end with an edge, a closed end, walls, and a fixed or detachable mechanical extension,

wherein said bonnet walls are formed from substantially air-impermeable material and, when fitted on a fetal head, provide substantial adherence thereto because of frictional forces and a substantially airtight fit and, when a predetermined stretching force is applied to the bonnet, said walls become air permeable and leak to lessen frictional and vacuum-related forces.

7. The apparatus of claim 6 wherein the mechanical extension comprises a handle.

8. The apparatus of claim 6 further comprising signalling means responsive to a predetermined longitudinal or rotational force.

9. The apparatus of claim 6 further comprising a gauge for measuring the amount of force applied to the bonnet.

10. The apparatus of claim 6 further comprising at least one fetal monitoring device.

11. The apparatus of claim 10 wherein the fetal monitoring device is attached to the bonnet by means of the mechanical extension.

12. The apparatus of claim 10 wherein said monitoring device is a fetal scalp electrode or an oximeter.

13. An obstetric traction delivery apparatus, comprising:

a smooth, collapsible bonnet shaped to provide a snug fit to a fetal head down to about eyes and ears, said bonnet having an inner surface, an outer surface, an open end with an edge, a closed end, walls, a fixed or detachable mechanical extension, and a fetal monitoring device,

wherein said bonnet walls are formed from substantially air-impermeable material and, when fitted on a fetal head, provide substantial adherence thereto because of frictional forces and a substantially airtight fit and, when a predetermined stretching force is applied to the bonnet, said walls become air permeable and leak to lessen frictional and vacuum-related forces.

14. The apparatus of claim 13 wherein the fetal monitoring device is attached to the bonnet by means of the mechanical extension.

15. The apparatus of claim 13 wherein said monitoring device is a fetal scalp electrode or an oximeter.