Apparatus for biological signal measurement at point of end-tidal

• US 9,049,993 B2
• Filed: 03/01/2010
• Issued: 06/09/2015
• Est. Priority Date: 03/02/2009
• Status: Active Grant

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kohden Corporation
• Inventors: Tanishima, Masami, Hyogo, Mitsushi, Mato, Takashi
• Primary Examiner(s): Thomson, William
• Assistant Examiner(s): Archer, Marie
• Application Number:
  US12/714,774
• Publication Number:
  US 20100222650A1
• Time in Patent Office: 1,926 Days
• Field of Search: 600300-301, 600363-365, 600373-374, 600377-379, 600382-384, 600386-394, 600/481, 600/485, 600500-503, 600/509, 600515-519, 600529-531, 600544-547, 600/549, 600587-595, 128920-925
• US Class Current: 1/1
• CPC Class Codes: A61B 2505/01 Emergency care
• CPC Class Codes: A61B 2505/03 Intensive care
• CPC Class Codes: A61B 2505/05 Surgical care
• 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 5/03 Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs A61B5/205 takes precedence
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61B 5/7271 Specific aspects of physiological measurement analysis A61B5/316, A61B5/349 and A61B5/374 take precedence
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence
• CPC Class Codes: A61B 5/74 Details of notification to user or communication with user or patient indicating measured values G01D7/00; user input means input or output arrangements for computers G06F3/00
• CPC Class Codes: G06F 19/34 Computer-assisted medical diagnosis or treatment, e.g. computerised prescription or delivery of medication or diets, computerised local control of medical devices, medical expert systems or telemedicine
• CPC Class Codes: G16H 15/00 ICT specially adapted for medical reports, e.g. generation or transmission thereof
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
• CPC Class Codes: G16H 40/67 for remote operation

Abstract

A biological signal measuring apparatus includes: a pressure sensor which measures a pressure in a living body; a respiratory sensor which measures respiratory information; and an outputting unit which detects an end-tidal based on the respiratory information measured by the respiratory sensor and which outputs a pressure value based on the pressure measured by the pressure sensor when detecting the end-tidal.

Claims

1. A biological signal measuring apparatus comprising:

a pressure sensor configured to measure an invasive blood pressure in a living body as a first invasive blood pressure value;

a respiratory sensor configured to measure respiratory information; and

an outputting unit configured to detect an end-tidal based on the respiratory information measured by the respiratory sensor and whether said end-tidal has occurred, and

a displaying portion connected to the outputting unit

wherein, as a result of detecting the end-tidal, the outputting unit is configured to update the first invasive blood pressure value and to output a second invasive blood pressure, which is an updated value of the first invasive blood pressure value and is based on the invasive blood pressure measured by the pressure sensor when detecting the end-tidal, to be displayed on the displaying portion and

wherein, as a result of the outputting unit not detecting the end-tidal, a displayed and outputted invasive blood pressure value is held at the first invasive blood pressure value.

2. The biological signal measuring apparatus according to claim 1, wherein

the pressure sensor is configured to measure at least one of a central venous pressure, a pulmonary arterial pressure, a pulmonary arterial wedge pressure, an arterial pressure, and an intracardiac pressure as the invasive blood pressure.

3. The biological signal measuring apparatus according to claim 1, wherein

the respiratory sensor is one of an airway pressure sensor, a respiratory flow sensor, a carbon dioxide sensor, a respiratory volume sensor, a respiratory thermal sensor, and an impedance respiratory sensor.

4. The biological signal measuring apparatus according to claim 1, wherein

the respiratory sensor is of a mainstream type.

5. The biological, signal measuring apparatus according to claim 1, wherein

the end-tidal is detected from a falling edge of a differentiated waveform of a capnograph.

6. The biological signal measuring apparatus according to claim 1, wherein

the end-tidal is detected by obtaining a timing when expiration is switched to inspiration in an airway pressure, a respiratory flow, or a respiratory volume waveform.

7. The biological signal measuring apparatus according to claim 1, wherein

at least one of the first invasive blood pressure value and the second invasive blood pressure value output by the outputting unit corresponds to one of an average pressure obtained by a moving average and an average pressure of one heartbeat period.

8. The biological signal measuring apparatus according to claim 1, wherein at least one of (i) both of a value of the first invasive blood pressure measured by the pressure sensor and the second invasive blood pressure value output by the outputting unit are simultaneously displayed, and (ii) one of the value of the first invasive blood pressure measured by the pressure sensor and the second invasive blood pressure value output by the outputting unit is selectively displayed.

9. The biological signal measuring apparatus according to claim 1, further comprising:

a selecting unit,

wherein

the respiratory sensor includes a plurality of respiratory sensors including an airway pressure sensor, a respiratory flow sensor, a carbon dioxide sensor, a respiratory volume sensor, a respiratory thermal sensor, and an impedance respiratory sensor, and

the selecting unit selects at least one of respiratory information which are measured by the plurality of respiratory sensors.

10. The biological signal measuring apparatus according to claim 1, wherein

the outputting unit updates the first invasive blood pressure, as the second invasive blood pressure value, that is measured by the pressure sensor only at a time point when detecting the end-tidal.

11. The biological signal measuring apparatus according to claim 1, wherein

the outputting unit outputs the second invasive blood pressure that is measured by the pressure sensor in response to the detection of the end-tidal.

12. A biological signal measuring apparatus comprising:

a pressure sensor configured to measure an intracranial pressure in a living body as a first intracranial pressure value;

a respiratory sensor configured to measure respiratory information; and

an outputting unit configured to detect an end-tidal based on the respiratory information measured by the respiratory sensor and whether said end-tidal has occurred, and

a displaying portion connected to the outputting unit

wherein, as a result of detecting the end-tidal, the outputting unit is configured to update the first intracranial pressure value and to output a second intracranial pressure value, which is an updated value of the first intracranial pressure value and is based on the intracranial pressure measured by the pressure sensor when detecting the end-tidal, to be displayed on the displaying portion, and

wherein, as a result of the outputting unit not detecting the end-tidal, a displayed and outputted intracranial pressure value is held at the first intracranial pressure value.

13. The biological signal measuring apparatus according to claim 12, wherein

the respiratory sensor is one of an airway pressure sensor, a respiratory flow sensor, a carbon dioxide sensor, a respiratory volume sensor, a respiratory thermal sensor, and an impedance respiratory sensor.

14. The biological signal measuring apparatus according to claim 12, wherein

the respiratory sensor is of a mainstream type.

15. The biological signal measuring apparatus according to claim 12, wherein,

the end-tidal is detected by from a falling edge of a differentiated waveform of a capnograph.

16. The biological signal measuring apparatus according to claim 12, wherein

the end-tidal is detected by obtaining a timing when expiration is switched to inspiration in an airway pressure, a respiratory flow, or a respiratory volume waveform.

17. The biological signal measuring apparatus according to claim 12, wherein at least one of the intracranial pressure value output and the second intracranial pressure value output

corresponds to one of an average pressure obtained by a moving average and an average pressure of one heartbeat period.

18. The biological signal measuring apparatus according to claim 12,

wherein at least one of (i) both of a value of the first intracranial pressure measured by the pressure sensor and the second intracranial pressure value output by the outputting unit are simultaneously displayed, and (ii) one of the value of the first intracranial pressure measured by the pressure sensor and the second intracranial pressure value output by the outputting unit is selectively displayed.

19. The biological signal measuring apparatus according to claim 12, further comprising:

a selecting unit,

wherein

the respiratory sensor includes a plurality of respiratory sensors including an airway pressure sensor, a respiratory flow sensor, a carbon dioxide sensor, a respiratory volume sensor, a respiratory thermal sensor, and an impedance respiratory sensor, and

the selecting unit selects at least one of respiratory information which are measured by the plurality of respiratory sensors.