Developing A Needle Knife Surgical Device for Ultrasonic Assisted Surgery

Abstract

Ravaglia FFA and Cliquet Jr A

Introduction: A new era of orthopedic surgery is happening nowadays. Procedures like Video Surgery, Ultrasound Guided Interventions, Pain interventions invasive orthopedics procedures, hydrodissection, dry needling; thermography assisted pain procedures and acupuncture started to be widely performed [1].

Objective: The aim of the project is to assess Ultrasonic assisted surgery in pig foot from butchery using three differences needleknife devices.

Method: All three needles were used for ultrasonic assisted surgery in pig feet from butchery. An ultrasonic assisted surgery was performed in 9 nine pig feet. The two well developed digits were assessed. The pig has two larger central toes. These larger central toes bear most of the weight, but the outer two are also being used in soft ground. Two toes each foot was assessed, one medial and one lateral. We numbered the pig foot from I to IX in roman figures. The first three I, II and III were used for needle A (control) for all medial and lateral toes. The samples IV, V and VI were used for needle B for all medial and lateral toes. The samples VII, VII and IX were used for needle C for all medial and lateral toes. The surgical technique consists in an ultrasonic assisted percutaneous tenotomy of the deep flexor tendon between distal and proximal phalanx near the sesamoid bone on the pig toe. Assessed for clinical release of the joint; gap in the plantar cushion pad and ecographic assessment. A final open dissection was performed [2].

Results: Model 3 presented similar features in rigidity to the baseline model 1 (3,6%). They have a similar performance. The tip of model 3 increased a tension of 15%; but does not mean fracture risk. In ultrasonic assisted surgery in pig feet from butchery the geometry; puncture capability, cutting capability, tip deformation and tip fracture. Geometry: Group A Control; group C and then group B Puncture capability: Group B; Group C and then Grupo A. Cutting ability: Group C; then A and then B. (tip of B deformation) Resistance: Group A; then group C and then group B. Deformation: needle B has a tip deformation in 50 % of the cases.

Conclusion: Two different bisel tips needle shapes were modified from the original one metal guide of an intravenous catheter in order to improve the cutting ability as well as maintain the aspiration and infusion feature. One longer surface edge and another one not so long. The longest, although supposed to be the best performer is not strong enough and deformed. The second one is the most useful for needle knife instruments. More clinical study is recommended.

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