A blog about what is new (and old) in the world of active implantable medical devices 

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Home Articles posted by David Prutchi (Page 5)
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Crazy Pacemaker Hack: d.i.y. High-Speed Photography

This is a hack that combines three of my favorite passions: pacemakers, photography, and coffee! I took this photograph by feeding the output of an infrared barrier to the atrium input of an old DDD pacemaker, setting an appropriate AV delay, and using the ventricular output to trigger a camera flash (via a optoisolator).  In

 
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St. Jude’s (ANS) Rechargeable Spinal Cord Stimulators Eon and Eon Mini

In 2005, St. Jude Medical purchased Advanced Neuromodulation Systems (ANS) in Plano, Texas.  ANS had developed a number of spinal cord stimulation IPGs that were either externally powered via inductive link, internally powered by a primary cell, or internally powered by a transcutaneously rechargeable lithium-ion cell. Today, the most popular St. Jude spinal cord stimulators are the rechargeable

 
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Intermedics’ First Pacemakers (Mid 1970s)

In 1973, former Medtronic sales representative Albert Beutel founded Intermedics in Freeport, TX.  The first product was a small, mercury-cell-powered pacemaker.  In 1974 Intermedics introduced a lithium-powered version, and in 1976 it introduced InterLith which was hermetically sealed, and weighed just 65 grams.  At the time, InterLith’s size was a breakthrough, and became a very popular device, solidifying Intermedics’ position in the industry.  

 
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Original Datasheet for Arco’s Nuclear Pacemakers (ca. 1974)

Some time ago, my friend and colleague Paul Spehr gave me a copy of Arco Medical’s product catalog.  I scanned the original datasheets for Arco Medical’s nuclear fixed-rate and demand pacemakers models NU-5 and NU-6 and posted them here in pdf format: Arco_Nuclear_Datasheets Click here for a color picture and more information on Arco Medical’s nuclear pacemakers.

 
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St. Jude’s DBS Study Confirms Benefit of Constant Current System for Parkinson’s Disease

Image Credit: St. Jude Medical Today St. Jude announced that its first controlled study of Deep Brain Stimulation (DBS) confirms benefit of constant current system for patients with Parkinson’s Disease. Results were published online today by The Lancet Neurology journal. The aim of the study was to evaluate the Libra(TM) and LibraXP(TM) DBS constant current systems

 
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St. Jude 4Q IPG Sales: CRM Down 4%, Neuromodulation 12% Up vs. Q4 2010

Yesterday, Jan 9, 2011, St. Jude Medical announced preliminary revenue results for the fourth quarter ended December 31, 2011: “Fourth quarter cardiac rhythm management sales were approximately $728 million, a 4 percent decrease compared with the fourth quarter of 2010. Fourth quarter sales of implantable cardiac defibrillators were approximately $436 million, a 5 percent decrease

 
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Implantable-Device.com is Back On-Line!

I apologize for yesterday’s interruption of service in this blog.  I moved hosting company because the old one was too slow and unreliable. Unfortunately, I fell for the 5-star reviews which actually ended up being paid by the hosting company…  I wish that they would invest half their marketing dollars on lowering server load. Oh

 
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American Optical Cardio-Care II Demand Pacemaker (ca. 1971)

  The Cardio Care II Pacemaker was American Optical’s second implantable device.  It was an improved version of the Cardio Care pacemaker.  Besides improvements to the circuitry, the circuit board was enclosed separately inside a hermetic can within the epoxy encapsulation.

 
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American Optical Cardio-Care Demand Pacemaker (1968)

Barouh Berkovits at American Optical Co of Boston, MA designed the first “Demand Pacemaker” – what we now know as a VVI pacemaker. The Cardio-Care Demand Pacemaker, introduced in 1968, was American Optical’s first implantable device. From Kirk Jeffrey’s Machines in our Hearts(2001): “Berkovits in 1963 designed a sensing capability into the pacemaker. His invention behaved exactly like an

 
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Biotectix

Image Credit: Biotectix Biotectix of Ann Arbor, MI recently contacted me to let me know of new conductive polymer materials that they are developing to enhance the performance of next-gen implantable stimulation and sensing devices. Indeed, their materials sound very promising.  According to Biotectix, their electrode coatings and device components are made from proprietary conducting polymers that provide

 
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Nanowattics: Ultra-Low-Power ASIC Design for Implantable Devices

 Nanowattics was founded in 2007 to provide development services of ultra-low-power application-specific integrated circuits (ASICs) for safety-critical applications. Nanowattics’ core team is extremelly experienced in the design of ASICs for implantable medical devices.  Their designs include the main ASIC for a DDDR pacemaker,  a sub-microvolt differential amplifier for electroneurographic signal acquisition, and the chipset for a

 
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A Challenge to History Buffs: Who Was Digikon?

I took this picture a very long time ago at the office of one of my implanter friends in Europe.  Ever since then, I’ve tried to find out about “Digikon,” but have had no luck so far.  All that I have been able to find from the St. Jude legacy device database is that Digikon had produced

 
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Cook Pacemaker’s Sensor Kelvin 504 Central-Venous-Temperature-Sensing Pacemaker (ca. 1992)

In 1983, Bill Cook and Dr. Neal Fearnot began to work under the Cook Pacemaker Company in Leechburg, PA on developing the technology developed by Dr. Fearnot at Purdue University into an improved prototype for a temperature-based exercise responsive pacemaker that was released in 1988 as the Kelvin Sensor rate-responsive pacemaker.  One of the first CVT

 
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Intermedics’ Circadia Central Venous Temperature-Sensing Pacemaker (ca. 1993)

The Circadia pacemaker was one of the very few devices that had a lead-borne thermistor to measure cental venous temperature (CVT) as a sensor for rate-response. A unique feature of this pacemaker was an iridium-oxide (IrOx)-coated button welded to the can.  It was believed that this button would improve unipolar IEGM sensing and reduce unipolar

 
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Cook’s Sensor Kelvin and Intermedics’ Circadia Temperature-Sensing Rate-Responsive Pacemakers

  One of the indicators of metabolic demand that has been used for controlling the rate of pacemakers is central venous blood temperature (CVT). In 1983, Bill Cook and Dr. Neal Fearnot began to work under the Cook Pacemaker Company on developing the technology developed by Dr. Fearnot at Purdue University into an improved prototype for

 
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