Design and Development in Surgical Instrument for Nose Surgery

The work describes the design and development of a surgical instrument for doing the lateral osteotomy. Currently a chisel and hammer is used to break the nasal bone in Rhinoplasty. During the surgery the surgeon positions the chisel and hit it with the hammer to break the nasal bone for doing the corrective surgery. It has many drawbacks like, non-uniform cutting of bone, probability of damage to nerves connecting eyes and brain, skill development and its time consuming. A new and innovative design of a simple mechanism to perform the surgery is discussed in this thesis. The designing process was initiated by studding the basic anatomy of the nose. The mean thickness on the lateral osteotomy line was 1.85 mm ± 0.32 mm in males and 1.91 mm ± 0.46 mm in females. Lever 1 mechanism was studied to design the forceps. It is experimentally calculated that gripping force is 250N-450N. The length of forceps was designed such that to transfer sufficient force to break the bone. Considering the above dimension and tolerance space available inside the nose the designing was completed. A rapid prototype model of the designed model was generated so that the surgeon could examine the forceps closely and suggest for modification. The fabrication process was initiated after this. The fabricated forceps was given to the surgeon for inspection. After getting confirmation from the surgeon, cadaveric study was conducted. The cadaveric study and its observations are discussed in detail.