Effect of externally applied skin surface forces on tissue vasculature.

The effect of surface forces on the morphologic pattern of skin capillaries was examined on the anterior surface of the forearm of healthy volunteers. A rig was designed to permit the application of uniaxial forces between two pads attached to the skin surface. A grid was printed onto the skin surface, and mechanical data are presented in terms of force intensity versus strain. During force application the skin capillaries were monitored using vital capillary microscopy. Mean values of force intensity and strain of 1.33N/mm and 10%, respectively, were sufficient to produce virtual obliteration of the blood flow to the capillaries. A simplified finite element model of the tissue was also employed to illustrate the effect of surface forces at different depths within the tissue. This study emphasizes the potentially damaging effects of surface forces on the integrity of the skin vasculature. If these forces are maintained or repeated, cell necrosis and eventual tissue damage would result.

[1]  D. Bader,et al.  A study of uniaxial tension on the superficial dermal microvasculature. , 1984, The Journal of investigative dermatology.

[2]  P. Payne.  Measurement of skin blood flow , 1984 .

[3]  O. Stenqvist,et al.  Microvascular changes due to repeated local pressure-induced ischemia: intravital microscopic study on hamster cheek pouch. , 1983, Archives of physical medicine and rehabilitation.

[4]  D L Bader,et al.  Mechanical characteristics of skin and underlying tissues in vivo. , 1983, Biomaterials.

[5]  P. Rolfe,et al.  Skin surface PO2 and blood flow measurements over the ischial tuberosity. , 1982, Archives of physical medicine and rehabilitation.

[6]  Van C. Mow,et al.  1980 Advances in Bioengineering , 1981 .

[7]  L. Bennett,et al.  Shear vs pressure as causative factors in skin blood flow occlusion. , 1979, Archives of physical medicine and rehabilitation.

[8]  B. Fagrell.  Local Microcirculation in Chronic Venous Incompetence and Leg Ulcers , 1979 .

[9]  E. I. Odell,et al.  Deformations and Stresses in Soft Body Tissues of a Sitting Person , 1978 .

[10]  G. Holloway,et al.  Laser Doppler measurement of cutaneous blood flow. , 1977, The Journal of investigative dermatology.

[11]  H. Stark.  Directional variations in the extensibility of human skin. , 1977, British journal of plastic surgery.

[12]  Cherry Gw,et al.  Decreased fibrinolysis in reperfused ischaemic tissue. , 1974 .

[13]  Dinsdale Sm,et al.  Decubitus ulcers: role of pressure and friction in causation. , 1974, Archives of physical medicine and rehabilitation.

[14]  T. Ryan,et al.  Fibrinolytic activity in human skin following epidermal injury. , 1969, The Journal of investigative dermatology.

[15]  S M REICHEL,et al.  Shearing force as a factor in decubitus ulcers in paraplegics. , 1958, Journal of the American Medical Association.

[16]  G V Cochran,et al.  Interstitial fluid flow as a factor in decubitus ulcer formation. , 1981, Journal of biomechanics.

[17]  J. H. Evans,et al.  Interface Pressure Sensors: Existing Devices, Their Suitability And Limitations , 1976 .

[18]  L. Guttmann.  The problem of treatment of pressure sores in spinal paraplegics. , 1955, British journal of plastic surgery.