Method and apparatus for implementing histogram storage and trend analysis in a medical stimulator
First Claim
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1. In an implantable device of the type comprising means for repeatedly measuring one of more predetermined parameters and memory means for storing information related to the measurements of said parameter for later transmission to an external monitoring device, the improvement wherein:
- said measuring means comprises means for providing digital codes indicative of the measurements of said one or more parameters;
wherein said memory means comprises a random access memory capable of storing data at a plurality of addresses, means for initializing said random access memory such that the data at each of said addresses of said random access memory is set to a predetermined value, and memory addressing means for addressing said random access memory and altering the data stored therein; and
wherein said memory addressing means operates in first and second alternative modes, such that in said first mode said addressing means sequentially addresses said addresses of said random access memory and sequentially stores said digital codes at successive ones of said addresses within said random access memory and such that in said second mode, said addressing means employs said digital codes to address said addresses of said random access memory, and with each said addressing of said random access memory incremented the value in said random access memory at the one of said addresses corresponding to the said digital code used to address said random access memory.
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Abstract
An implantable medical device employing a random access memory for storage of data relating the physiologic condition of the patient in which the device is implanted and/or information related to the functioning of the device. The memory and associated addressing circuitry are reconfigurable to allow for storage and display of information in either a histogram or trend line format.
139 Citations
12 Claims
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1. In an implantable device of the type comprising means for repeatedly measuring one of more predetermined parameters and memory means for storing information related to the measurements of said parameter for later transmission to an external monitoring device, the improvement wherein:
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said measuring means comprises means for providing digital codes indicative of the measurements of said one or more parameters; wherein said memory means comprises a random access memory capable of storing data at a plurality of addresses, means for initializing said random access memory such that the data at each of said addresses of said random access memory is set to a predetermined value, and memory addressing means for addressing said random access memory and altering the data stored therein; and wherein said memory addressing means operates in first and second alternative modes, such that in said first mode said addressing means sequentially addresses said addresses of said random access memory and sequentially stores said digital codes at successive ones of said addresses within said random access memory and such that in said second mode, said addressing means employs said digital codes to address said addresses of said random access memory, and with each said addressing of said random access memory incremented the value in said random access memory at the one of said addresses corresponding to the said digital code used to address said random access memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device comprising means for measuring the rate of occurrence of recurring physiologic events and storage and telemetry means for storing information related to said rates of said physiologic events, and for telemetering said stored information out of said medical device to an external monitor;
wherein said means for measuring comprises means for counting a predetermined number of said events and for measuring the interval of time required to count said predetermined number of events and for providing digital codes indicative of the average rate of occurrence of said events, wherein said storage and telemetry means comprises means for storing said digital codes and for telemetering said stored event rates out of said storage means in timed order for telemetry to said external monitoring device. - View Dependent Claims (11, 12)
Specification