Investigation of vibration parameters for needle insertion force reduction

Dennis Rehling,Jan Liu,Frank Schiele,Kent W Stewart,Peter P Pott

doi:10.1515/cdbme-2020-3155

Abstract

Abstract Many medical interventions in therapy and diagnostics require needle insertion into tissue. Common complications such as increased pain and formation of haematoma are caused by wrong needle positioning. It has been shown that pain experience and needle positioning can be improved by a reduction of insertion force, which can be achieved by vibrating the needle axially. An experimental setup has been designed to investigate the influences of different combinations of vibration frequencies (10, 100, and 200 Hz) and vibration amplitudes (20, 100, and 500 μm) during needle insertion into thin sheets of polyethylene terephthalate (PET). A customary 20 W loudspeaker was used to generate the vibration. The results indicate a maximum reduction of 73 % in puncture force and up to a 100 % reduction in shaft friction force. However, the additional vibration force generated by the vibration movement has to be high enough to generate positive effects in terms of force reduction.

Highlights

Drawing of blood for diagnostic testing is one of the most common invasive procedure performed in healthcare [1]
A phase with a constant very low insertion force can be seen which is characteristic for shaft friction acting only
The signal amplitude is increased at the respective vibration frequency and from the associated harmonics, as a consequence of the vibratory movement of the needle

Summary

Introduction

Drawing of blood for diagnostic testing is one of the most common invasive procedure performed in healthcare [1]. Begg and Slocum have worked on the concept of an axial oscillating vibration in the range of audible frequencies. They pierced into gelatine phantoms and investigated the reduction of the insertion force in relation to the insertion depth. Barnett investigated the puncture force when piercing into porcine skin He examined frequencies from 100 Hz to 2000 Hz and amplitudes from 5 μm to 50 μm and achieved a maximum reduction of 35 % in puncture force. This was achieved by applying a vibration with 500 Hz and an amplitude of 25 μm [5]. No investigation of the influences of frequency and amplitude on different phases during insertion has been conducted

Methods

Results

Conclusion