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James McDonald

The Enabling Chip Technologies Behind Miniature Implantable Medical Devices

James McDonald
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ue2014
ue2014
10/27/2014 3:33:14 AM
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Re: human screening
That's a great news. If this projects goes through, it would help the countries security as well as it could save many Human lives. Even such technologies would be used to serve many other purposes as well....

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vasanjk
vasanjk
10/25/2014 10:22:48 PM
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Re: Circuit protrction
Defibrillation events and electrosurgical generator interference can impact such applications. Good to know protection upto 2KV is available. Rest can be taken care of by dedicated circuit protection devices.

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James108
James108
10/25/2014 2:30:05 PM
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Re: Circuit protrction
We do include ESD protection on all of our pins.  The protection is to provide a minimum of 2000V HBM (Human Body Model).  We also do ESD testing with machine model (MM) and charge device model (CDM).  However, many user of our circuits, medical device companies, also include external protection schemes particular to address defibrillation events.

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vasanjk
vasanjk
10/25/2014 12:07:24 PM
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Master
Circuit protrction
Hi James Very interesting information. As I am from Medical device field, I am curious to understand how circuit protection is deployed in MIMDs as the focus is on miniaturization and low power consumption. In a typical electronic device, even a finger touch could create heavy ESD and we use Varistors and TVS diodes. My specific question is, do your chips incorporate such circuit protection devices internally?

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James108
James108
10/24/2014 3:30:18 PM
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Re: power supplies
The solid state batteries (SSBs) are developed on silicon wafers much like ICs.  In fact, in some cases you can integrate the battery and the IC on one piece of silicon.  Although this currently is not the typical use case.  The SSB are rechargeable as well.

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analoging
analoging
10/24/2014 1:47:41 PM
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human screening
Radiation scanner companies are developing screening systems for airport security to check for implantable explosives within humans carrying out suicide missions. Typically an electromagnetic energy source reflects off the non-standard biological object implanted which generates an ultrasonic signal that is detected leading to alarm notification.

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ue2014
ue2014
10/23/2014 1:47:32 AM
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Master
Re: IMDs Side Effects
Totally agree with you. Since we are dealing with Human Health, we need to be extra careful about the dependability of our products. Therefore, many Human Testing would needed to make sure that these MMIDs does not have any side effects on human body and does not influence the natural behaviors. On the other hand, there should be a mechanism to check the situation of the MMID as well once it's inserted to the Human Body just to makes sure it's condition as well.

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amrutah
amrutah
10/19/2014 3:18:37 PM
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Re: IMDs Side Effects

@fasmicro: Yes, I agree.  A lot of medical IC designs are concentrating on biasing the enhancement MOSFET in weak inversion instead of using the BJT's.  One more great advantage is low voltage operation.  The only problem with weak inversion devices is less of dynamic range.

  The point of sub-threshold physics that you mentioned arises a question.  Does the standard berkeley spice model for devices good enough or do we have to use the EKV models, which are said to be good when it comes to sub-threshold mode of operation.

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amrutah
amrutah
10/19/2014 2:38:26 PM
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Master
Re: IMDs Side Effects
There are a few things that I really don't understand

1> Say the device is reliable for 10 years, how is the problem tackled when it comes to its End-of-Life.  What is the stand by option for the patient using the implated device if the device suddenly stops.

2> With people carrying so many electronic gadgets the EMI emissions pose a great threat (false triggers or failures) for these low voltage IMD devices.  These have to be systematically tackled.

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amrutah
amrutah
10/19/2014 2:30:09 PM
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Master
power supplies
"...solid-state batteries (SSBs) are critical and have compelling key characteristics for their adoption."

@James: Thanks for the information about the IMDs.

  What are these SSB are they something similar to carbon nanotubes?  Somewhere in 2013 there was a paper on the carbon nanotubes used for powering and building and growing the Heart muscles. 

cen.acs.org/articles/91/web/2013/02/Carbon-Nanotubes-Help-Grow-Beating.html

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