Method, Device and Computer-Readable Medium for Evaluating Prevalence of Different Patient Postures

• US 20080194998A1
• Filed: 05/24/2005
• Published: 08/14/2008
• Est. Priority Date: 05/24/2005
• Status: Abandoned Application

• Current Assignee: St. Jude Medical AB (Abbott Laboratories)
• Original Assignee: St. Jude Medical AB (Abbott Laboratories)
• Inventors: Holmstrom, Nils, Ohlander, Malin
• Application Number:
  US11/913,785
• Publication Number:
  US 20080194998A1
• Time in Patent Office: Days
• US Class Current: 600/595
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/103 Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes A61B5/08 takes precedence; measuring aids for tailors A41H1/00; measuring instruments specially adapted for dentistry A61C19/04
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: A61N 1/3702 Physiological parameters A61N1/365 takes precedence; evoked response A61N1/371
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

In a method, device and compute-readable medium for evaluating the prevalence of different postures of a patient, signals are sensed that indicate the posture of the patient during a monitoring period having a predetermined length, specific body postures of the patient are determined during this monitoring period from the sensed signals, the amount of time the patient spends in each of the specific postures is measured, information regarding each specific posture, and the associated amount of time spent in that posture, are stored, and the prevalence of the different postures of the patient is evaluated by classifying the stored information with respect to specific postures and the amount of time in each posture position.

Claims

1. A method for evaluating the prevalence of different postures of a patient, comprising the steps of

sensing signals indicating the posture of said patient during a monitoring period having a predetermined length;

determining specific body postures of the patient during said monitoring period using said signals;

measuring the amount of time, the patient spends in each of said specific postures;

storing information regarding each specific posture and the amount of time spent in each posture; and

evaluating the prevalence of said different postures of the patient by classifying said stored information with respect of specific postures and the amount of time spent in corresponding postures.

2. The method according to claim 1, further comprising the step of selecting at least one measurement criterion in dependence of said evaluation;

and

storing said selected first measurement criterion.

3. The method according to claim 2, comprising employing a specific body posture of the patient as said at least one measurement criterion.

4. The method according to claim 2, further comprising the step of initiating a measurement session in order to measure at least one physiological parameter when said selected at least one measurement criterion is satisfied.

5. The method according to claim 1, further comprising the steps of:

sensing an activity level of said patient during said monitoring period;

determining whether said activity level is within at least one predetermined range storing information regarding the activity level range of the patient together with each specific posture and the amount of time spent in each posture; and

using said information regarding the activity level range of the patient in said evaluation by classifying said information with respect of specific postures, the amount of time spent in corresponding postures, and activity level range.

6. The method according to claim 5, further comprising the step of selecting a second measurement criterion of said at least one measurement criterion, in dependence of said evaluation, for measurement of said least one specific physiological parameter;

and storing said selected second measurement criterion.

7. The method according to claim 6, comprising employing a specific activity level range of the patient as said second measurement criterion.

8. The method according to claim 1, wherein the step of evaluating comprises classifying said information as to distribution of said periods of time said patient spends in a specific posture over said monitoring period.

9. The method according to claim 1, further comprising initiating a measurement session if said selected at least one measurement criterion is satisfied during a predetermined period of time of the day.

10. The method according to claim 1, further comprising the steps of:

sensing a heart rate of the patient;

determining whether the heart rate is within a predetermined range; and

using said predetermined heart rate range as a measurement criterion.

11. The method according to claim 1, further comprising:

at the initiation of a measurement session, measuring an amount of time elapsed since a preceding measurement session; and

cancelling initiation of the measurement session if the amount of time elapsed since said preceding measurement session is within a predetermined range.

13. The method according to claim 1 comprising, in said sensor measurement session measuring a physiological characteristic selected from the group consisting of blood pressure, blood pressure variation, heart sound, contractility, endocardial acceleration, blood flow, coronary blood flow, electrical bio-impedance, cardiogenic impedance, and infra thoracic impedance.

12. (canceled)

14. A medical device for evaluating the prevalence of different postures of a patient comprising

a position sensor that senses the posture of said patient;

a determining unit that determines specific body postures of the patient during a monitoring period having a predetermined length using position signals from said position sensor;

a timer that measures an amount of time the patient spends in each of said specific postures;

a storage unit that stores information regarding each specific posture and the amount of time spent in each posture; and

an evaluation unit that evaluates the prevalence of said different postures of the patient by classifying said stored information with respect of specific postures and the amount of time spent in corresponding postures.

15. The medical device according to claim 14, wherein the storage unit stores at least one selected measurement criterion, said measurement criterion being selected in dependence on said evaluation.

16. The medical device according to claim 15, wherein said at least one measurement criterion is a specific body posture of the patient.

17. The medical device according to claim 15, further comprising:

a measurement circuit that executes a measurement session in order to measure a physiological parameter of said patient;

a measurement criterion determining unit connected to said position sensor and said measurement circuit, that determines whether said at least one measurement criterion is satisfied; and

if said at least one measurement criterion is satisfied, said measurement criterion determining unit applying a triggering signal to said measurement circuit, wherein said measurement circuit, upon receiving said triggering signal, initiates a measurement session.

18. The medical device according to claim 14, further comprising:

an activity level sensor or that senses an activity level of said patient;

an activity level determining unit that determines whether said sensed activity level is within at least one predetermined range;

said storage unit storing information regarding the activity level range of the patient together with each specific posture and the amount of time spent in each posture; and

said evaluation unit the prevalence of said different postures of the patient by classifying said stored information with respect of specific postures, the amount of time spent in corresponding postures, and the activity level range.

19. The medical device according to claim 18, wherein said storage unit stores a second measurement criterion of said at least one measurement criterion, said second measurement criterion being selected in dependence on said evaluation.

20. The medical device according to claim 19, wherein said second measurement criterion is a specific activity level range of the patient.

21. The medical device according to claim 14, wherein said evaluation unit classifies said information as to distribution of periods of time said patient spends in a specific posture over said predetermined patient monitoring period.

22. The medical device according to claim 16, wherein said measurement criterion determining unit applies said triggering signal to said measurement circuit if said selected at least one measurement criterion is satisfied during a predetermined period of time of the day.

23. The medical device according to claim 14, further comprising:

a rate sensor that senses a heart rate of the patient;

means for determining whether the heart rate is within a predetermined range; and

wherein said storing means is arranged to store said predetermined heart rate range as a measurement criterion.

24. The medical device according to claim 16, wherein:

said timer, at the initiation of a measurement session, measures the amount of time elapsed since the preceding measurement session; and

applies a signal to said measurement circuit cancelling the initiation of the measurement session if the amount of time elapsed since said preceding measurement session is within a predetermined range.

29. The medical device according to claim 14, wherein said measurement unit senses any physiological characteristic selected from the group consisting of blood pressure, blood pressure variation, heart sound, contractility, endocardial acceleration, blood flow, coronary blood flow, bio-impedance, intra-thoracic and cardiogenic impedance.

25-28. -28. (canceled)

30. (canceled)

31. A computer-readable medium encoded with a data structure, for use with a computer connected to a sensor, said data structure, when said computer-readable medium is loaded in the computer, causing the computer 2:

sense signals with said sensor indicating the posture of a patient during a monitoring period having a predetermined length;

determine specific body postures of the patient during said monitoring period using said signals;

measure the amount of time, the patient spends in each of said specific postures;

storing information regarding each specific posture and the amount of time spent in each posture; and

evaluate the prevalence of said different postures of the patient by classifying said stored information with respect of specific postures and the amount of time spent in corresponding postures.