Design of a novel laparoscopic instrument with combined functionality of a grasper & needle holder

Abstract

Laparoscopy involves the use of various instruments for performing different functions. As a consequence, time is spent in exchanging the various instruments, adding to the overall operation time. In order to reduce this overall operation time and solve this problem, the number of instrument exchanges need to be reduced. Reducing the number of instrument changes would also lead to fewer disruptions in the choreography of the surgery and decrease costs related to purchase of instrument and their cleaning. Therefore, in this project, the goal is to develop an instrument with the combined functions of a grasper and a needle holder, to reduce the need of instrument exchanges for performing 2 functions. The requirements for the instrument were decided on the basis of the sub-functions to be performed. Conceptual solutions were then generated to perform the desired sub-functions and systematically compared to obtain a final concept. This final concept was detailed regarding the various mechanisms in the instrument and the distinct assemblies it contains. The force models of these mechanisms were used to theoretically validate the working principles using the required force to be generated. A physical validation of the working principles was also obtained by 3D prints. Further work and research should be done to develop a working prototype of the instrument to validate the functionality of the complete instrument.