Devices, systems and methods for endocardial pressure measurement

• US 20050182330A1
• Filed: 03/16/2005
• Published: 08/18/2005
• Est. Priority Date: 10/14/1997
• Status: Abandoned Application

• Current Assignee: Data Sciences U K Limited (International Business Machines Corporation)
• Original Assignee: Transoma Medical, Inc.
• Inventors: Kalm, Michael L., Brockway, Brian
• Application Number:
  US11/084,625
• Publication Number:
  US 20050182330A1
• Time in Patent Office: Days
• US Class Current: 600/486
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/0028 Body tissue as transmission medium, i.e. transmission systems where the medium is the human body
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/031 Intracranial pressure
• CPC Class Codes: A61B 5/036 by means introduced into body tracts A61B5/032 and A61B5/035 take precedence
• CPC Class Codes: A61B 5/283 Invasive
• CPC Class Codes: A61B 5/29 for permanent or long-term implantation
• CPC Class Codes: A61B 5/6882 Anchoring means
• CPC Class Codes: G08C 19/24 using time shift of pulses
• CPC Class Codes: H04B 14/026 using pulse time characteristics modulation, e.g. width, position, interval
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 25/493 by transition coding, i.e. the time-position or direction of a transition being encoded before transmission
• CPC Class Codes: H04Q 2209/43 using wireless personal area networks [WPAN], e.g. 802.15, 802.15.1, 802.15.4, Bluetooth or ZigBee
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

Endocardial pressure measurement devices, systems and methods for the effective treatment of congestive heart failure and its underlying causes, in addition to other clinical applications.

Claims

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44. A system for correcting internal pressure measurement for changes in barometric pressure, the system comprising:

a barometric pressure monitor located external to a patient'"'"'s body and configured to measure, at specified intervals, a barometric pressure to which the patient'"'"'s body is exposed;

a barometric pressure memory configured to store a first value of the measured barometric pressure with a first time stamp and to store a subsequent value of the measured barometric pressure with a subsequent time stamp if a difference between the subsequent value and the stored value in a latest previous time exceeds a preset threshold;

an implantable pressure sensor device configured to measure, at specified times, internal pressure in the patient'"'"'s body with respect to a specific reference pressure;

an internal memory configured to be disposed in the patient'"'"'s body and to record values of the measured internal pressure with information of the time of measurement; and

a correction module configured to correct the recorded values of the measured internal pressure using the stored values of the measured barometric pressure to obtain corrected internal pressure.

45. The system of claim 44 wherein the correction module is an external correction module disposed external to the patient'"'"'s body.

46. The system of claim 45 wherein the implantable pressure sensor device and the internal memory are incorporated in an implantable telemetry device which is configured to transmit the recorded values of the measured internal pressure to the external correction module via a wireless link.

47. The system of claim 46 wherein the external correction module is configured to transmit the corrected internal pressure to the implantable telemetry device.

48. The system of claim 45 wherein the barometric pressure monitor includes the barometric pressure memory.

49. The system of claim 48 wherein the barometric pressure monitor is configured to transmit the stored values of the measured barometric pressure to the external correction module via a hard link or a wireless link.

50. The system of claim 44 wherein the correction module is configured to reconstruct time information and substrate the measured barometric pressure from the measured internal pressure to obtain corrected internal pressure based on the recorded values of the measured internal pressure and the stored values of the measured barometric pressure.

51. The system of claim 44 wherein the preset threshold is about 0.5 mmHg.

52. The system of claim 44 wherein the correction module is an internal correction module disposed inside the patient'"'"'s body.

53. The system of claim 52 wherein the implantable pressure sensor device, the internal memory, and the barometric pressure memory are incorporated in an implantable telemetry device which is configured to receive the measured barometric pressure from the barometric pressure monitor via a wireless link.

54. A method of correcting internal pressure measurement for changes in barometric pressure, the method comprising:

measuring, at specified intervals, a barometric pressure external to a patient'"'"'s body and to which the patient'"'"'s body is exposed;

storing a first value of the measured barometric pressure with a first time stamp in a barometric pressure memory, and storing a subsequent value of the measured barometric pressure with a subsequent time stamp in the barometric pressure memory if a difference between the subsequent value and the stored value in a latest previous time exceeds a preset threshold;

measuring, at specified times, internal pressure with an implantable pressure sensor device in the patient'"'"'s body with respect to a specific reference pressure;

recording values of the measured internal pressure with information of the time of measurement; and

correcting the recorded values of the measured internal pressure using the stored values of the measured barometric pressure.

55. The method of claim 54 wherein correcting the recorded values of the measured internal pressure is performed by a correction module disposed external to the patient'"'"'s body.

56. The method of claim 55 wherein the values of the measured internal pressure are recorded in an internal memory disposed in the patient'"'"'s body, and further comprising transmitting the recorded values of the measured internal pressure to the external correction module via a wireless link.

57. The method of claim 56 further comprising transmitting the corrected internal pressure from the external correction module to an implantable telemetry device which incorporates the implantable pressure sensor device and the internal memory.

58. The method of claim 55 wherein the barometric pressure memory is disposed external to the patient'"'"'s body.

59. The method of claim 58 further comprising transmitting the stored values of the measured barometric pressure to the external correction module via a hard link or a wireless link.

60. The method of claim 54 wherein correcting the recorded values of the measure internal pressure comprises reconstructing time information and subtracting the measured barometric pressure from the measured internal pressure to obtain corrected internal pressure based on the recorded values of the measured internal pressure and the stored values of the measured barometric pressure.

61. The method of claim 54 wherein the preset threshold is about 0.5 mmHg.

62. The method of claim 54 wherein correcting the recorded values of the measured internal pressure is performed by a correction module disposed inside the patient'"'"'s body.

63. The method of claim 62 further comprising transmitting the measured barometric pressure from the barometric pressure monitor to the correction module via a wireless link.