HEWLETT PACKARD 8-WAVELENGTH EAR OXIMETER, MODEL 47201A

HEWLETT PACKARD 8-WAVELENGTH EAR OXIMETER, MODEL 47201A Hewlett Packard 8-wavelength Ear Oximeter Model 47201A See additional 25 photos below. We do not have the headset and cable. AI Overview: The HP 47201A is a historic eight-wavelength ear oximeter introduced by Hewlett-Packard in late 1974. It was the first "gold standard" for non-invasive, continuous arterial oxygen saturation measurement and was widely used in clinical studies to verify the accuracy of the first modern pulse oximeters. Technical Specifications and Theory: Unlike modern fingertip pulse oximeters that use two light wavelengths, the HP 47201A utilized a more complex multi-wavelength spectrophotometric technique. * Wavelengths: It used eight different spectral lines to measure light attenuation through the ear pinna. * Sensor Design: The device featured an earprobe coupled to a large mainframe via a fiber-optic cable. * Arterialization: The probe included a temperature-controlled heater to maintain the ear at 41̊C, stimulating arterial blood flow to ensure accurate readings. * Standardization: The unit required standardization upon being turned on by inserting the probe into a specific front-panel cavity to record reference light levels. Performance and Accuracy: The HP 47201A was renowned for its reliability in challenging clinical environments. * Accuracy: It maintained an accuracy of 5% for saturation levels above 50%. Below 50%, it predictably underestimated saturation, requiring a specific correction factor. * Response Time: According to research published in the Hewlett-Packard Journal, it had a 50% response time of approximately 2.87 seconds. * Clinical Robustness: It was designed to work for patients with severe conditions like shock or sepsis where peripheral circulation in the fingers might be compromised; the ear was chosen as it is one of the last areas affected by poor circulation. * Sensitivity: The device was notably sensitive to carboxyhemoglobin, which could lead to overestimating arterial saturation in smokers or patients with carbon monoxide exposure. Historical Significance: While highly accurate, the HP 47201A was a "massive" and expensive instrument, costing roughly $13,000 in the 1960s/70s. Hewlett-Packard ceased production of this model in 1983 as smaller, lower-cost pulse oximeters using light-emitting diodes (LEDs) and the "pulsatile component" principle became the industry standard. Powers up (see photos). Unable to test further, therefore we are selling it for parts or not working. University, Fortune 1000 Company and Federal Gov. agency (certified SAM vendor) Purchase Orders with open billing, Net 30. Overall Dimensions: 17"W x 17"D x 7.5"H Net Weight: 40 pounds Payment I accept the following forms of payment: PayPal Direct Offline Credit Card Payment: Visa/Master Card Shipping & Handling Please check eBay's Shipping & Payment tab UPS Ground FREE scheduling, supersized images and templates. Get Vendio Sales Manager. FREE scheduling, supersized images and templates. Get Vendio Sales Manager. Over 100,000,000 served. Get FREE counters from Vendio today!