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Recent News and Articles on the Keywords: energized pacemakers + 34 after + after  Related to the article below (Last Update: 5/13/2008)

[CITATION] Nuclear Pacemaker Still Energized After 34 Years
G Emery

Lubricious, wear resistant surface coating by plasma polymerization -
L Larry - US Patent 6,506,457, 2003 - freepatentsonline.com
... For example, pacemaker leads having a silicone rubber insulating ... an active or inert
gas plasma energized by the RF ... desired thickness of the coating 34 has been ...

-
DG Hepp, RA Neumann, P Citron - US Patent 4,187,854, 1980 - Google Patents
... that after the 40 the oscillator 22 is continuously applied to the coil 16'. surgical
implantation of such demand pacemakers, that The secondary coil 34'a ...

-
CH Rushton, EE Hogue - J. Contemp. Health L. & Pol'y, 1991 - HeinOnline
... 34. ... ethical dilemmas."a Because of their emotional investment and energized emotional
state ... A pacemaker, in the form of an electrical conducting wire, may also ...

-
DL Thompson, RM Bennett, GM Roline - US Patent 4,556,063, 1985 - Google Patents
... receives signals via sense amplifier 34 and delivers ... sources 26 and 30 are energized
to provide ... intracardiac electrogram derived from the pacemaker lead system ...

Metabolic-demand pacemaker and method of using the same to determine minute volume -
TA Nappholz, M Lubin, HL Valenta Jr - US Patent 4,702,253, 1987 - freepatentsonline.com
... The pacemaker shown in the drawing is capable of ... the output of the IRP multivibrator
34, representing a ... output of the slope detector is energized whenever the ...

Treatment of Primary Venous Insufficiency by Endovenous Saphenous Vein Obliteration
JG Chandler, O Pichot, C Sessa, S Schuller- … - Vascular and Endovascular Surgery, 2000 - ves.sagepub.com
... VOLUME 34 ... and impedance measure- ments, using the latter to confirm adequate elec-
trode-vein-wall contact before the treatment cir- cuit is energized. ...

Signal source impedance of implanted pacemaker electrodes estimated from the spectral ratio between … -
L M?rkrid, OJ Ohm, E Hammer - Medical and Biological Engineering and Computing, 1980 - Springer
... from the ratios H(jtoi) obtained in patients with permanent pacemaker electrodes,
and in patients with temporary multicore wire electrodes after open heart ...

Temporary inhibition of permanently implanted demand pacemakers -
P Latif, GA Ewy - Circulation, 1977 - Am Heart Assoc
... Br Heart J 34: 263, 1972 6. Steeg CN ... spikes is shown when the programnmer is energized
(programmer on ... of any of the four Cordis Omnicor programmable pacemakers ...

… time courses of intracellular free calcium and related electrical effects after injection of CaCl 2 … -
G Hofmeier, HD Lux - Pfl?gers Archiv European Journal of Physiology, 1981 - Springer
... characterized by a depression of I(V, t), confirming earlier observations by Heyer
and Lux [34]. The depression occurs within one second after an injection and ...

Source: Google Scholar

Nuclear pacemaker still energized after 34 years

Last Updated: 2007-12-20 12:42:46 -0400 (Reuters Health)

By Gene Emery

BOSTON - A U.S. surgeon who implanted a nuclear-powered pacemaker into a 20-year-old woman in 1973 says the device is still going strong after 34 years and may have saved money over the long run.

But Dr. Victor Parsonnet of the Newark Beth Israel Medical Center said he is not advocating a return to those devices because they have drawbacks.

In a letter to the New England Journal of Medicine, Parsonnet said despite an original $5,000 price tag -- more than $23,000 in 2007 dollars -- follow-up costs have been about $19,000 compared with $55,000 for a battery-powered pacemaker.

A standard pacemaker probably would have needed replacement four or five times over the past three decades, along with extra monitoring.

The woman, now 54, has tolerated her Numec NU-5 well -- except for the need to repair a connector -- and maintains a normal routine.

Although her pacemaker gives a steady jolt instead of the adjustable pace of current devices and stimulates the heart from a spot that is different from the one preferred by surgeons today, "she hasn't had a bit of problem and feels fine," Parsonnet said.

Nuclear pacemakers have been controversial because they are powered by plutonium, one of the most dangerous substances known.

The devices were designed to withstand gunshots and cremation, and last so long they would outlive their hosts, while being shielded well enough to deliver very little radioactivity to the patient.

Parsonnet said 139 people received the first versions of the nuclear pacemaker and even after 88 years, when half the plutonium would have decayed, the batteries would have enough power to drive the circuit.

Most of the devices have outlived their owners.

"Nine of these devices are still in use," Parsonnet said.

Nuclear pacemakers fell out of favor because lithium batteries were developed that "had a life expectancy that was good enough for almost everybody."

"Lithium pacemakers will often go 10 to 15 years depending on how it's programmed," Parsonnet said, adding "the technology of the electronics ran ahead of the battery technology."

Today, doctors want to be able to periodically replace older-model pacemakers anyway, as the technology for pacing the heart improves.

"You now have programmability and interrogatability and all those things," he said. "So it died a natural death."

Copyright © 2007 Reuters Limited. All rights reserved. Republication or redistribution of Reuters content, including by framing or similar means, is expressly prohibited without the prior written consent of Reuters. Reuters shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon. Reuters and the Reuters sphere logo are registered trademarks and trademarks of the Reuters group of companies around the world.

 
 
 
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