Biomedical subjects

Michael S Floyd

Publications and source records attributed to Michael S Floyd.

3 recordsLinked to original sources

PubMed2006

Fluidics and heat generation of Alcon Infiniti and Legacy, Bausch & Lomb Millennium, and advanced medical optics sovereign phacoemulsification systems.

PURPOSE: To study heat generation, vacuum, and flow characteristics of the Alcon Infiniti and Bausch & Lomb Millennium with results compared with the Alcon Legacy and advanced medical optics (AMO) Sovereign machines previously studied. DESIGN: Experimental study. METHODS: Heat generation with continuous ultrasound was determined with and without a 200-g weight. Flow and vacuum were determined from 12 to 40-ml/min in 2-ml/min steps. The impact of a STAAR Cruise Control was also tested. RESULTS: Millennium created the most heat/20% of power (5.67 +/- 0.51 degrees C unweighted and 6.80 +/- 0.80 degrees C weighted), followed by Sovereign (4.59 +/- 0.70 degrees C unweighted and 5.65 +/- 0.72 degrees C weighted), Infiniti (2.79 +/- 0.62 degrees C unweighted and 3.96 +/- 0.31 degrees C weighted), and Legacy (1.99 +/- 0.49 degrees C unweighted and 4.27 +/- 0.76 degrees C weighted; P < .0001 for all comparisons between machines except Infiniti vs Legacy, both weighted). Flow studies revealed that Millennium Peristaltic was 17% less than indicated (P < .0001 to all other machines), and all other machines were within 3.5% of indicated. Cruise Control decreased flow by 4.1% (P < .0001 for same machine without it). Millennium Venturi had the greatest vacuum (81% more than the least Sovereign; P < .0001), and Cruise Control increased vacuum in a peristaltic machine 35% more than the Venturi system (P < .0001). CONCLUSIONS: Percent power is not consistent in regard to heat generation, however, flow was accurate for all machines except Millennium Peristaltic. Restriction with Cruise Control elevates unoccluded vacuum to levels greater than the Venturi system tested.

Drainage↗

PubMed2006

Genital self-mutilation.

A 53-year-old man was brought to the emergency department having removed both testicles and amputated his penis using a bread knife. Examination of the amputated penis showed it to be unsuitable for an attempted replant procedure. The patient was taken to theatre where the perineal wound was debrided and the remaining urethra brought down as a perineal urethrostomy, with a local cutaneous flap rotated to provide coverage for the urethra. Discussed herein are the incidence, predisposing factors, management and complications of genital self-mutilation in the adult male, and the existing literature is reviewed on the subject.

Amputation, Traumatic↗

PubMed2005

Measurement of the scleral canal using optical coherence tomography in patients with optic nerve drusen.

PURPOSE: The etiology of optic nerve drusen (OND) is unknown. A leading hypothesis is that eyes with OND have a small scleral canal. The small scleral canal presumably leads to optic nerve fiber compression, ganglion cell degeneration, extrusion of axonal mitochondria, and calcification of the extruded mitochondria. To determine if subjects with OND have scleral canals that are smaller than subjects without OND, we used optical coherence tomography (OCT) to measure the scleral canal in subjects with and without OND. DESIGN: Prospective, observational case control study. METHODS: The study was conducted with subjects recruited from the clinics of the John A. Moran Eye Center, University of Utah Department of Ophthalmology and Visual Sciences. The study population included 25 subjects with OND, 13 unaffected first-degree relatives of OND subjects, and 17 control subjects. All subjects underwent measurement of the scleral canal with OCT. The main outcome measure was the scleral canal area calculated by OCT. RESULTS: The average areas of the scleral canals were as follows: control eyes: 1.832 mm(2), unaffected eyes of subjects with unilateral OND: 1.836 mm(2), eyes of unaffected first-degree relatives: 2.067 mm(2), and eyes with OND: 2.520 mm(2). The scleral canal area of unaffected eyes of subjects with unilateral drusen was not significantly different from the control. The eyes of first-degree relatives and eyes with OND both had scleral canal areas significantly larger than the control. CONCLUSIONS: Scleral canal size is probably not an etiologic factor in the pathogenesis of OND.

Adolescent↗