Appeal No. 96-4032
Application 08/054,496
have been withdrawn from consideration.
The invention relates to a clock circuit for implantable medical devices. Appellants disclose on
page 2 of the specification that accurate clock signals are essential for proper functioning of
programmable pacemakers. On page 3 of the specification, Appellants disclose that master clock
circuits for these devices are susceptible to failure because EMI and Cautery can cause the master
clock signal to have a too narrow signal. This narrow signal causes an operational failure of the
microprocessor because the clock signal does not meet the clock duty cycle requirements.
Appellants disclose on page 3 of the specification that their invention solves this problem by
providing a new subsystem block that receives the output clock signal from the master clock and
generates a modified master clock signal. The function of the new subsystem block is to guarantee that
the modified master clock signal delivers to the system clock signals that have a duration to ensure
correct functionality of the system microprocessor. Appellants disclose on page 4 that this function is
achieved by ensuring that the clock signal does not change state until the pulse generator and the system
microprocessor have generated an event completion signal.
On page 8 of the specification, Appellants disclose that Figure 2 is a simplified schematic
diagram of the new subsystem block 200. Appellants state that the purpose of the subsystem 200 is to
lock out all transitions on the modified master clock signal MCLK 202 until the system
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007