Humby Knife Handles are used in conjunction with the sterile Skin Graft Blades for harvesting "Macro" or "Major" Skin Grafts. The knives have an in-built adjustable guard which can limit the maximal thickness of the graft harvested depending on the properties of the skin at the donor site. This can vary in thickness due to multiple factors including the age of the patient. The exact thickness of the graft can also depend upon: 1) The contact angle between the blade and skin whilst harvesting. 2) The pressure applied by the operator onto the knife whilst harvesting. These are important aspects of skin grafting technique that need to be mastered to enable reproducibly consistent harvesting of high quality split thickness skin grafts. The adjustment between the roller and the blade itself is achieved by two knurled collars mounted on the back of the knife. The Stainless steel blade is locked securely in the leaf spring holder. To fit a new blade one moves the safety catch in order to open the leaf and the blade can be inserted under the roller before reengaging the safety catch. There is a tendency for skin to roll up around the guard when cutting thin split skin grafts with the humby knife however this can be corrected by the placing traction on the cut skin otherwise the fine sheet of skin may tear. The roller must also move freely from side to side requiring slack end-bearings that can reduce precision in the setting resulting in the graft sometimes becoming gradually thicker as the knife progresses. Two adjustments are necessary at either end of the knife to set the depth of cut and again if the setting is unequal the graft may be thicker on one side.
Trustpilot
1 month ago
3 weeks ago
