Biomedical subjects

L Bennett

Publications and source records attributed to L Bennett.

At least 91 records · Page 5Linked to original sources

PubMed1979

Transferring load to flesh: part IX. Cushion stiffness effects.

Stresses developed within flesh in contact with a cushion are examined analytically. Compressive, tensile, and shear stresses within flesh in proximity to a bone are given as a function of cushion stiffness (major parameter) and the overall Poisson's ratio of flesh (minor parameter). It is shown that an individual already sitting on a soft cushion receives relatively minor benefit when a still softer cushion is substituted. This result follows from the fairly flat (saturated) trend of both shear and tensile stress with respect to cushion stiffness, once the soft cushion domain (less than 10 PSI) is entered. Only flesh normal stress (compression) responds significantly to incremental changes of stiffness within the soft cushion range; reducing the cushion stiffness 50 percent will typically reduce local compressive stress by roughly 20 percent. While such a gain is real, it is also modest.

Bone and Bones↗

PubMed1979

Locomotion assistance through cane impulse.

The extent of locomotion assistance gained through cane usage by those with hip disorders is assayed. Employing as a standard the propulsive impulse delivered by each lower limb of a healthy young male, the cane is shown to supply about one-fifth the equivalent impulse, aside from other possible benefits. Full test values are given for nine handicapped subjects.

Adult↗

PubMed1978

Malignant lymphoma associated with marked eosinophilia.

A 60-year-old black man with poorly differentiated lymphocytic lymphoma presented with generalized lymphadenopathy and marked eosinophilia. Extensive evaluation of the eosinophils revealed them to be normal morphologically and functionally. The patient responded to corticosteroid therapy with resolution of the lymphadenopathy and reversion of the peripheral blood counts to normal limits. Recurrence of the original clinical picture within months prompted institution of systemic chemotherapy. Response was transient, and the patient expired after an unremitting downhill course. Recent advances in our knowledge of mechanisms of eosinophilia and eosinophil function are reviewed. The relationship of lymphoma to eosinophilia is discussed.

Eosinophilia↗

PubMed1977

Slipping cane and crutch tips. Part I--static performance of current devices.

A variety of commercially available cane and crutch tips were tested on surfaces of ice and soapy tile under varying axial (thrust) loads. The output measurement consisted of the angle between the vertical and the cane axis at which slip occurred. It was learned that: 1. From the viewpoint of a user, a minimal slip angle of roughly 25 deg is desirable. 2. On ice-rink ice, a number of cane tips approach the desired slip angle under conditions of low temperature; fewer appear safe at elevated air temperatures. Only one of the tested devices appears truly safe under any ice condition. 3. On rough tile flooded with soapy water, some cane tips offer adequate performance. However, no tested cane tip offers acceptable performance on slick tile flooded with soapy water. 4. There appears to be no simple relationship between the slip performance of a cane tip on ice-rink ice and that developed on soapy wet tiles. 5. No simple relationship between thrust load and slip angle emerged. Similarly, no simple relationship between contact area and slip appeared in the data.

Age Factors↗

PubMed1975

Transferring load to flesh. Part VIII. Stasis and stress.

Those who suffer peripheral vascular disease (PVD) frequently require lower-limb amputation. To prevent further difficulties with circuation, the socket and support system of the resulting artificial leg should be arranged so as to prevent impairment of blood flow. The mechanical stress factors tending to impede flow and cause stasis are investigated. An assessment is made of the relative importance of the two types of stress, normal and shear, in reducing the flow within a simulated vessel surrounded by a model flesh.

Artificial Limbs↗

PubMed1974