Abstract
This article introduces a new biomedical / open surgical instrument to assist surgeon in applying surgical clips to patient’s body tissue and blood vessel during surgical processes. The new clip delivery system is designed to better the clip’s distal advance through internal clip channel, jaw guiding track, and all other transition areas to keep surgical clip from accidental shooting out during clip’s distal move into jaws. Currently the clip distal move in normal surgical instrument is usually driven by compression springs and some complains of clip accidental drop-off were recorded in surgical procedures. Because higher request of dimensional tolerance and better component surface quality are needed in case the compression springs are used as driven force, a little dimensional devia-tion or less qualified part surface produced from manufacturing processes will potentially cause surgical clip device malfunction or misfiring of the clips. It is clearly known that the jaws can seriously sever or damage patient’s blood ves-sel or body tissue if there is no clip inside the jaws due to accidental clip drop-off, when surgeons close instrument handles. The improved internal system design in this new open surgical instrument can prevent clip from accidental drop-off because of well guided and controlled clip distal move through internal clip channel and track. Besides the operational force to fully form clip is lower than existing surgical clip devices due to better mechanical advantage in this new instrument design. In addition to the above, manufacturing and product cost can be decreased since lower requirement of dimensional tolerance and surface quality of instrumental parts is allowed in this new surgical instrument design. This new instrumental prototype is build upon the analysis of computer aided modeling and simulation to prove its good mechanical advantage, feasible function, reliable performance. The preliminary results of instrument fir-ing force from both computer aided modeling and prototype testing are very close to each other, and preliminary prototype testing shows no accidental clip drop-off in this new biomedical / surgical clip instrument.
Highlights
It is critical for surgeons to apply surgical clip instrument to the severed organs, blood vessels and body tissues to stop bleeding in surgical procedure [1,2,3]
This result shows that, if 20 lbf forces are required to fully form the surgical clip, the operational force that surgeon needed is 3.265 lbf that is lower than normal spec of 4 lbf and this will benefit surgeons in their surgical procedure. Both computational simulation and prototype testing results are very close which verify and prove the credibility of this new instrument design and research methodology. The prototype of this new surgical clip instrument has been proved to have feasible function and better performance based on instrumental functional study, computer aided modeling and solution, and preliminary prototype testing
This new instrument design has several major advantages compared with some current surgical clip devices including: the clip’s distal move can be properly guided and controlled to prevent patient’s blood vessel and body tissue from damage that caused by accidental clip shooting out during surgical processes, operational force to form clip is lower than usual surgical clip instruments, instrument production and product cost can be decreased since loose dimensional tolerance and low surface quality of instrumental components are allowed in this new design
Summary
It is critical for surgeons to apply surgical clip instrument to the severed organs, blood vessels and body tissues to stop bleeding in surgical procedure [1,2,3]. The surgical instruments in which surgical clips were driven by compression spring require higher dimensional tolerance control and better surface quality during component manufacturing and this will lead a low volume and high cost instrumental production, otherwise the clips will drop-off or shooting out if dimensional tolerance are too loose or clips will jam or not move by spring force if dimensions are too tight. This new instrument design has different clip delivery system compared with current clip instruments. The preliminary testing results indicated that there is no clip shooting out in this surgical instrument design and the operating force to fully form the clip is between 3.16 lbf and 3.30 lbf which are lower than 4 lbf in existing surgical instrument
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