Flange/stem ratio

Importance of flange/stem ratio and the weight of the device in stabilizing and anchoring the percutaneous device. 

In-Vivo Percutaneous Implant Experiment. The principle of percutaneous attachment has extensive application in many biomedical areas, including the attachment of dental and orthopedic prostheses directly to skeletal structures, external attachment for cardiac pacer leads, neuromuscular electrodes, energy transmission to artificial heart and for hemodialysis. Several attempts to solve the problem of fixation and stabilization of percutaneous implants(19) have been made. Failures were also attributed to the inability of the soft tissue interface to form an anatomic seal and a barrier to bacteria. In the current studies, the effect of pore size on soft tissue ingrowth and attachment to porous polyurethane (PU) surface and the effect of the flange to stem ratio and biomechanical compliance on the fixation and stabilization of the percutaneous devices have been investigated.(20)... 

A series of percutaneous implant devices with three stem/flange ratios (1 1, 1 2 and 1 4) was fabricated from three materials (Dacron velour - silicone, porous PU and porous metal). The implants were totally porous (coarse, 150-250 ym) with 1.5 mm diameter holes drilled throughout the device. Figure 6 shows the mold and the polyurethane percutaneous devices with three stem/ flange ratios and 1.5 mm diameter drilled holes. 

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See also in sourсe #XX -- [ ]

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