Abstract
Abstract The location of a puncture needle’s tip and the resistance of tissue against puncture are crucial information for clinicians during a percutaneous procedure. The tip location and needle alignment can be observed by image guidance. Tactile information caused by tissue resistance to rupture, allow clinicians the perception of structural changes during puncture. Nevertheless, this sense is individual and subjective. To improve percutaneous procedures, the implementation of transducers to enhance or complement the senses offer objective feedback to the user. Known approaches are e.g. based on integrated force sensors. However, this is connected to higher device costs, sterilization and certification issues. A recent publication shows the implementation of an audio transducer clipped at the proximal end of the needle. This sensor is capable of acquiring emitted sounds of the distal tiptissue interaction that are transmitted over the needle structure. The interpretation of the measured audio signals is highly depended on the transmission over the needle, the tissue and, the penetration depth. To evaluate the influence of these parameters, this work implements a simplified experimental setup in a controlled environment with a minimum of noise and without micro tremors induced by clinician’s hands. A steel rod simulating a needle is inserted into pork meat of different thickness. A controlled impact covering the needle’s tip mimics tissue contact. The resulting signals are recorded and analyzed for better understanding of the system.
Highlights
Percutaneous procedures have proven to be efficient and safe during the extraction of a sample tissue for a diagnosis or a treatment that requires the administration of medication [1]
The parameter of maximum instantaneous energy can be associated with waves of resonance the constant of decay to the time of energy dissipation
The audio signals follow the behavior of the mechanical model and, the parameters approached by an exponential form (Eq 1) allow the differentiation of three scenarios in interaction with the same tissue
Summary
Percutaneous procedures have proven to be efficient and safe during the extraction of a sample tissue for a diagnosis or a treatment that requires the administration of medication [1]. Last-mentioned, thanks to the implementation of medical imaging techniques as ultrasound or magnetic resonance. The success of a percutaneous procedure implementing an imaging technique was associated with the clinician’s skills and experience. Because its subjectivity, different researches in robotics [1][2], sensors [3][4], navigation [6], tracking [7] and enhancement algorithms [8] have shown to be objective, useful for clinicians during a procedure and, most of them successfully implemented on real scenarios. In most of the cases, sensors are located on the tip or any part of the needles shaft in contact with tissue
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