A novel method for safe and accurate placement of the rocker pins of head immobilization devices utilizing a digital caliber phantom: technical note

Abstract

Background: Immobilization of the head and skull by head immobilization devices (HIDs) is a common practice in neurosurgery. A variety of complications and morbidities are associated with pinning the skull during application of HIDs.

Objective: Our aim is to describe a new technique that avoids repeated puncturing of the head and skull during application of HIDs and hence avoiding the potential complications resulting from multiple re-adjustments.

Methods: We used a pre-adjusted digital millimetric caliber (DMC) as a phantom for the two rocker pins of the HID to mimic and simulate the process of skull pinning. Localization and preparation of the accurate skull pinning sites are safely guided by the pinning phantom.

Results: The technique was applied in different neurosurgical approaches. The pinning phantom was utilized to accurately locate the suitable pinning sites. Contrary to the common practice, there was no need for repeated head and skull puncturing. Minimal manipulations of the head and neck are exerted in this approach as compared with the usual techniques. The head of the patient is allowed to be kept safe on the operating table until the final one-time confident skull pinning by the sterilized skull clamp pins.

Conclusion: The process of scalp and skull pinning of HIDs is technically demanding. The DMC utilized as a pinning phantom is a useful technique which provides safe and confident application of the skull rocker pins of HIDs allowing the neurosurgeon to avoid multiple puncturing of scalp and skull and minimizing manipulations of the head and cervical spine.

Keywords: Head clamp; Head immobilization devices; Mayfield holder; Skull clamp; Skull pinning.