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

Category Archives: Therapies

AIMDs classified according to general type of therapy

American Optical Cardio-Care Demand Pacemaker (1968)

Posted on by Posted in American Optical (1965-1975), Bradycardia, Cardiac Pacing, History, Museum

American Optical Cardio-Care Implantable 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 asynchronous pacer until it detected a naturally occurring R wave, the indication of a ventricular contraction. This event would reset the timing circuit of the pacemaker, and the countdown to the next stimulus would begin anew. Thus the pacer stimulated the heart only when the ventricles failed to contract. It worked only ‘‘on demand.’’ As an added benefit, noncompetitive pacing extended the life of the battery. Continue reading→

Biotectix

Posted on by Posted in Biotectix, Brain Stimulation, Cardiac Pacing, Electrode Materials, Electrodes, Tech Talk
Biotectix electrically conductive polymers for implantable devices
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 intimate, long-term electrical and biological connections between implantable electrodes and the target tissue.  They offer the conductivity and stability of metals at a low-cost with the ease of processing and biological functionality of polymers. Continue reading→

A Challenge to History Buffs: Who Was Digikon?

Posted on by Posted in Bradycardia, Cardiac Pacing, Digikon, History, Museum

Digikon model LD451 Ventricular Inhibited Pulse Generator

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 a number of pacemaker models, including the one shown in this picture.

Do you know anything about Digikon?  Please let me know!

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

Posted on by Posted in Bradycardia, Cardiac Pacing, Cook Pacemaker, History, Museum

Cook Pacemakers Sensor Kelvin Model 504 central-venous-temperature-sensing rate-responsive pacemaker

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 rate-adaptive pacemakers was the Cook Model Kelvin 500 series. Continue reading→

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

Posted on by Posted in Bradycardia, Cardiac Pacing, History, Intermedics (1974-1999), Museum

Intermedics Circadia central-venous-temperature-sensing rate-responsive pacemaker

Back side of Intermedics Circadia pacemaker. Labeling shows special connector for temperature-sensing lead.

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 pacing thresholds (it didn’t). Continue reading→

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

Posted on by Posted in Bradycardia, Cardiac Pacing, Cook Pacemaker, History, Intermedics (1974-1999), Museum

 

Cook Pacemaker's Kelvin and Intermedics' Circadia central venous temperature-controlled rate-responsive pacemakersOne 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 a temperature-based exercise responsive pacemaker that was released in 1988 as the Kelvin Sensor rate-responsive pacemaker.  One of the first CVT rate-adaptive pacemakers was the Cook Model Kelvin 500 series.

Another one of the first CVT rate-adaptive pacemakers was the Intermedics Nova MR, which differs from the Kelvin 500 series in that its pacing algorithm had a more dynamic HR response. Continue reading→

Medtronic’s Chronicle Implantable Hemodynamic Monitor for Heart Failure Monitoring

Posted on by Posted in ECG Monitoring, Heart Failure (CHF), History, Medtronic, Telemetry
Medtronics Chronicle Implantable Hemodynamics Monitor
Image Credit: Medtronic

The Medtronic Chronicle implantable hemodynamic monitor used a specialized RV lead/sensor.  The device was able to monitor and telemeter:

  • Systolic and diastolic pressure
  • Estimated pulmonary artery diastolic pressure
  • RV dp/dt (positive & negative)
  • Heart rate & activity
  • Core body temperature
  • Continuous remote monitoring
  • Continue reading→

Medcor Corporation’s Pacemakers (ca. 1975)

Posted on by Posted in Bradycardia, Cardiac Pacing, Daig, History, Medcor (1971-1980), Museum, St. Jude Medical

Medcor Corporation pacemaker ca. 1975Medcor was established in Hollywood, FL in 1969, and began developing pacemakers, lead and accessories in 1971.  By 1975 it had a series of lithium-powered pacemaker in the market, but they never became popular with physicians.

On July 1980, Daig Corporation of Minnetonka, MN acquired Medcor with the expectation that Medcor pacemaker technology could be profitably marketed.

Daig had hoped to market a new line of Medcor pacemakers, but significant electronic malfunctions were encountered which foreclosed further development Medcor’s pacemaker product line. As a result of malfunctions in the first pacemaker line, FDA approval was withheld on a second Medcor line of pacemakers due to similarities in product design.

In 1981, amidst a very serious financial condition, Daig closed its doors.  The remaining assets were acquired by Daig’s largest customer – Pacesetter (now part of St. Jude Medical).

UPDATE, May 20, 2013: 

Mark Christensen – who worked at Daig Corporation from 1980 to 1986 – sent me a kind note with some additional information:  “As you note in your comments on Medcor, it was purchased by Daig in 1980 but remained as a separate business. Daig’s financial crisis in 1981 caused Daig to go into Chapter 11 Bankruptcy and Medcor went to Chapter 7 – liquidation and was sold at auction in late 1981. No pacemaker company bought any of the assets. Daig reorganized, diversified into EP catheters and was bought by St Jude Medical in 1996 (15 years later).”   Thanks Mark!

 

VeriMed’s Human-Implantable VeriChip Patient RFID

Posted on by Posted in Dementia, Diabetes, Epilepsy, PositiveID, RFID, Stroke, Transplant Rejection
VeriMed's Human-Implantable VeriChip RFID

Image Credit: VeriMed

VeriMed’s VeriChip is the only RFID tag that has been cleared by FDA for human implant.  The concept behind the medical use of the VeriChip is that patients would have the tiny chip implanted just under the skin, in the back of the arm.  Each VeriMed microchip contains a unique identification number that emergency personnel may scan to immediately identify the patient and access his/her personal health information, thus facilitating appropriate treatment without delay.  This is especially important for patients who suffer from conditions that may render them unconscious, confused, or unable to communicate.  Although the FDA approved the use of the device for anyone 12 years of age or older, it would mostly be recommended for patients with diabetes, stroke, seizure disorders, dementia, Alzheimer’s, developmental disorders, and organ transplants.

Continue reading→

CardioMEMS Miniature Implantable Wireless Sensors

Posted on by Posted in Aneurysm, CardioMEMS, Heart Failure (CHF), Telemetry

CardioMEMS miniature implantable sensor for heart failure and aneurism management

CardioMEMS was founded by Dr. Jay S. Yadav and Dr. Mark G. Allen in Atlanta, GA in 2000 to develop implantable micro-electromechanical sensors to improve the management of severe chronic cardiovascular diseases such as heart failure and aneurysms.

The miniature wireless sensors can be delivered through a catheter.  Once in place, they transmit cardiac output, blood pressure and heart rate data that are critical to the management of patients. Due to their small size, durability, and lack of wires and batteries, CardioMEMS’ sensors are designed to be permanently implanted into the cardiovascular system. An external reader is used to interrogate the sensors. Continue reading→

NDI Medical’s Miniature MicroPulse Neurostimulator

Posted on by Posted in Incontinence, Medtronic, Muscular Stimulation, NDI Medical, Pain, Paralysis, Spinal Cord Stimulation, SPR Therapeutics, Wireless Power Transmission
NDI Medical MicroPulse rechargeable neurostimulator
Image Credit: SPR Therapeutics

NDI Medical was founded in 2002 by Geoffrey B. Thrope to develop and commercialize neurodevice products.  NDI Medical developed the MicroPulse neurostimulator, a thumb-sized, rechargeable pulse generator, that has been used for the treatment of incontinence and pain, as well as an implantable device for the restoration of function of paralyzed limbs.

According to a 2006 news release by the electronics assembly manufacturer for the MicroPulse:

“Using minimally-invasive surgery, the Micropulse is implanted into a patient, usually in the lower abdomen or buttock, where the device is most comfortable and least visible. After implantation, a clinician uses a wireless programmer to set the Micropulse’s stimulus parameter and timing patterns. The programmer, as well as the patient’s controller for the device, has a range of about three feet.

To recharge the device’s lithium-ion battery, the patient applies a recharging patch for several hours to the vicinity of the implant. The battery needs recharging from once a month to every few weeks.” Continue reading→

Leptos Biomedical’s Splanchnic Nerve Stimulation For Treatment Of Obesity (2002-2010)

Posted on by Posted in EnteroMedics, Gastric Stimulation, History, Leptos Biomedical, Neural Stimulation, Obesity

Leptos Biomedical, Inc. Splanchnic nerve stimulation for treatment of obesityLeptos Biomedical was founded in Fridley, MN in 2002 by Dr. John D. Dobak.   Leptos intended to develop an implantable device to stimulate the greater splanchnic nerve, that was hoped would  result in reduced food intake and increased energy expenditure.

In February 2010 Leptos announced its closure.  Reasons were not provided, but it has been suggested that the decision was prompted by the 2009 announcement by competitor EnteroMedics’ that it had failed to meet the primary goals of its pivotal study. EnteroMedics’ Maestro device didn’t perform any better than a sham device.  EnteroMedics is now conducting a new study with the device.

Click here for Leptos Biomedical’s patents.

 

Palyon Medical’s Implantable Programmable Pain-Medicine Pump

Posted on by Posted in Drug Delivery, Pain, Palyon Medical

 

Palyon Medical programmable implantable pump for chronic pain control
Image Credit: Palyon Medical’s animation at www.biodigital.com

Palyon Medical Corporation was founded in 2004 in New York, NY, but recently moved its operations to Santa Clarita, CA.  Palyon is still operating stealthily.

Palyon is developing a programmable implantable drug delivery system (IDDS) which delivers targeted doses of pain medication directly to the spinal area for the treatment of chronic pain, spasticity and other neurological diseases.  According to Luis Malave, the company’s CEO, “Due to its inherent flexibility as a delivery platform, the IDDS can be used to deliver therapeutics to treat both acute diseases, such as cancer, and chronic diseases including diabetes and multiple sclerosis.” Continue reading→

Neuros Medical’s Implantable Device to Alleviate Amputation Pain

Posted on by Posted in Nerve Blocking, Neuros Medical, Pain
Neuros Medical Electrical Nerve Block implantable device to alleviate amputated limb pain
Image Credit: Neuros Medical

Neuros Medical was founded by Jon J. Snyder in Cleveland, OH in 2008 to develop a neurostimulation therapy to alleviate chronic pain.  The company’s Electrical Nerve Block™ technology is based on research done at Case Western Reserve University.

The company’s Nerve Block is an implantable device that delivers high-frequency stimulation to sensory nerves in the peripheral nervous system. Neuros’ aim is to stop a wide variety of chronic pain, including residual limb pain, chronic post surgical pain, and chronic migraine.

In November 2011 Neuros Medical announced that it has received IDE approval from the FDA to evaluate its technology for use in acute treatment of pain in the residual limb of amputees.

Company website: http://www.neurosmedical.com/

Click here for patents on Case Western University’s nerve blocking technology

 

 

NeuroVista’s Implantable EEG for Seizure Prediction

Posted on by Posted in EEG Monitoring, Epilepsy, NeuroVista, Telemetry
NeuroVista's implantable EEG for early epileptic seizure detection

Image Credit: NeuroVista

Seattle-based NeuroVista was founded in 2002 by Dr. Daniel DiLorenzo to develop an implantable device for the early detection of epileptic seizures.

The NeuroVista seizure advisory system is based on an implantable device that senses EEG irregularities that precede a seizure. Early warning allows patients to take medicine and find a safe place to lie down. Although some epilepsy sufferers can feel seizures coming, many cannot.

In NeuroVista’s Seizure Advisory System (SAS), intracranial EEG signals are recorded through electrodes implanted between the skull and the brain surface. Data storage and signal telemetry takes place within the pectorally-implanted can that transmits signals wirelessly to an external handheld device that processes the data and transmits visual and audible signals to the patient. The external pager-like receiver displays a blue light when there is a low likelihood of seizures, white indicates medium susceptibility, and red alerts to a high likelihood of impending seizure. Continue reading→