The magnitude and distribution of pressure of obstetric forceps on a fetal head mannequin model

Affiliations

Advocate Christ Medical Center

Abstract

Introduction: Considerations for forceps specific shape and dimensions are usually not available for review. This study evaluates surfaces of contact, magnitude of force, and pressure distribution of different forceps on a fetal head model.

Materials and methods: Pressure-sensitive films were cut following planar impressions of commonly used forceps. After biparieto-bimalar applications on a term fetal head model, the films were scanned and areas of contact, pressure, and force calculated. Comparisons were made between different types of film and forceps. Significance was considered if p < 0.05.

Results: Fifty-four forceps impressions were analyzed. With decreasing film sensitivities, smaller contact areas (p < 0.01) and higher mean pressures (p < 0.01) were detected. No significant differences were noted between different forceps regarding contact areas, pressure, or force. Most impressions reveal pressure points in the range of 980-1400 psi.

Conclusion: Ergonomic improvements can be made to the design of forceps blades in order to improve maternal-fetal morbidity.

Document Type

Article

PubMed ID

40730540

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