Surgery – Diagnostic testing
Reexamination Certificate
1999-01-27
2001-06-12
O'Connor, Cary (Department: 3736)
Surgery
Diagnostic testing
C128S920000, C705S003000, C600S361000
Reexamination Certificate
active
06245013
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to ambulatory recording, of medical data especially for diagnostic purposes, and particularly to an ambulatory recorder having synchronized communication between two processors.
BACKGROUND OF THE INVENTION
Various physiologic signals are often recorded and analyzed. These signals may included digestive pH, various digestive motility and pressure signal, EEG and EMG, to list only a few.
Typically, physicians require the concurrent recording a variety of physiologic signals. For example, gastric pH is often collected at the same time as pressure. Through the concurrent collection of various parameters the physician may better understand the patient's condition.
Ambulatory recording and recorders are widely used to collect such data. Such devices include the Digitrapper Mk III™ ambulatory recorder from Synectics Medical AB, the GastroScan II™ from Medical Instruments Corporation, and the SuperLogger™ from Sandhill Scientific. These types of devices make it possible for patients to remain at home, or at the least be ambulant in a hospital setting while physiological data is recorded. Typically the devices comprise a lightweight recorder in which the desired physiological data signals are temporarily stored and later downloaded for future analysis.
Many types of physiological data may be recorded, including ECG (Electrocardiogram), EEG (Electroencephalogram) or pH and pressure (Motility) in the gastrointestinal tract. Preferably such a recorder should be able to record among a programmable number of channels at a variety of programmable frequencies.
Among the problems with current recorders, however, is that of energy usage. Such recorders, because they must be ambulatory, are battery powered. Thus an ambulatory medical recorder must minimize energy usage while performing almost constant sampling across a variable number of channels at one or more frequencies. Besides minimizing energy usage, such recorders, however, must also offer robust functionality, i.e., be easy to operate, while also being flexible. Moreover, another crucial requirement is that such recorders be dependable, accurate and reliable.
One approach to construct a recorder offering flexible operation, ease of use, as well as a simple but powerful graphical user interface all while providing dependable, accurate and reliable data sampling and recording is through the use of two processors. This approach may include using processors of different types, such as the first processor being a real time processor (“NRTP”) to handle the sampling function, while the second processor being a non real time processor (“NRTP”) to handle the operating system function.
Among the problems with a data recorder using two processors is that of communication between the processors. Although this may be a problem regardless of the processors selected, in the situation where the first processor is a RTP and the second processor is a NRTP, the problem is especially acute. In particular, the RTP runs a real time single task software; while the NRTP runs a non-real time multitasking operating system and application with priorities. Thus, communication with the RTP could be started by several tasks within the NRTP at the same time. Ultimately this may lead to confusion in the recorder and ultimately lead to a system failure and/or data loss. Thus, there exists a need to ensure communication between two processors within an ambulatory recorder will be synchronized, thereby preventing system failure and/or data loss.
SUMMARY OF THE INVENTION
An ambulatory recording, for medical and especially for diagnostic purposes, and particularly to an ambulatory recorder having synchronized communication between a first processor and a second processor. In the preferred embodiment, the first processor is a real time processor (“RTP”) which handles the sampling function, while the second processor is a non real time processor (“NRTP”) which handles the operating system function. A protocol for communication between the two processors is provided which permits the processors to have synchronized and, therefore, reliable communication. The reliability aspect of the communication scheme is highly important since the sampled and stored data is the primary purpose of the data recorder. In the preferred embodiment the RTP operates only while sampling is occurring, while the NRTP only operates as needed. These as needed times include logging the sampled data into long term memory as well as reconfiguring system settings such as sampling frequency or channels to be sampled. In this manner an ambulatory medical recording device may be fashioned which has minimal power consumption but with reliable data acquisition and recording while still offering many features.
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Butler Arch W.
Gunnarsson Thorir
Minoz Alain
Pedersen Henrik E.
Williams Malcolm G. S.
Astorino Michael
Medtronic Inc.
O'Connor Cary
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