Implantable Lamp Encapsulation

Here is our first encapsulated Implantable Lamp (A3024Y), equipped with a BR1225 battery with capacity 48 mA-hr. This device is equipped with a white LED rather than an implantable head fixture.



The volume of the main body of the device is roughly 1.7 ml. The volume of the Subcutaneous Transmitter (A3019A), meanwhile, is 1.3 ml, and that of the Subcutaneous Transmitter (A3019D) is 2.4 ml. The former is tolerated by mice and the latter by rats. Our hope is that we can implant our 1.7-ml Implantable Lamp along with a 1.3-ml Subcutaneous Transmitter in a rat to monitor EEG and apply optical stimulus.

The A3024Y's 146-MHz command antenna is 30 mm in diameter compared to only 20 mm in diameter for the A3019A and A3019D 915-MHz data antenna. We do not know how well any animal will tolerate the larger antenna.

We move the A3024Y around at random near our 1.6-W source of 146-MHz radio-frequency power. At range 50 cm, the lamp flashes in roughly 95% of orientations. We are hoping for over 98% reliability at range 50 cm. We should be able to increase the reliability of reception by improving the tuning circuit and by increasing the power of our radio-frequency transmission.