Heartbeat synchronous wave detecting apparatus

• US 5,119,824 A
• Filed: 06/01/1990
• Issued: 06/09/1992
• Est. Priority Date: 07/27/1989
• Status: Expired due to Fees

• Current Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Original Assignee: Colin Electronics Co., Ltd.
• Inventors: Niwa, Minoru
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/531,769
• Time in Patent Office: 739 Days
• Field of Search: 606/32, 606/34, 128/672, 128/677, 128/680, 128/681, 128/687, 128/689, 128/690, 128/696, 128/709, 128/710, 128/901, 128/419 R
• US Class Current: 600/500
• CPC Class Codes: A61B 2017/00703 correcting for movement of heart, e.g. ECG-triggered
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/025 within occluders, e.g. responsive to Korotkoff sounds electric stethoscopes A61B7/04

Abstract

An apparatus for detecting a heartbeat synchronous wave produced from a subject in synchronization with heartbeat of the subject, including a probe which is adapted to be set on a body portion of the subject, a sensor for detecting the heartbeat synchronous wave produced from the subject, the sensor being supported by the probe, a judging device for judging whether or not an electric knife is being used on the subject, and a device for, if the judging device judges that the electric knife is being used, ceasing from detecting the heartbeat synchronous wave, or discarding the heartbeat synchronous wave detected when the electric knife is being used. The judging device may be adapted to detect a high frequency electric current flowing from an electric knife to the probe via the body portion of the subject, and judge whether or not the electric knife is being used on the subject, based on the detected high frequency electric current.

Claims

1. An apparatus for detecting a heartbeat synchronous wave produced from a subject in synchronization with heartbeat of the subject, comprising:

a probe which is adapted to be set on a body portion of said subject;

first sensor means supported by said probe, for detecting said heartbeat synchronous wave from said body portion of said subject;

second sensor means supported by said probe, for detecting a high frequency an electric current flowing from electric knife to said probe via said body portion;

judging means for judging whether or not said electric knife is being used on said subject, based on the electric current detected by said second sensor means; and

means for, if said judging means judges that said electric knife is being used, ceasing from detecting said heartbeat synchronous wave, or discarding the heartbeat synchronous wave detected when said electric knife is being used.

2. The apparatus as set forth in claim 1, wherein the detection of said electric current by said second sensor means is independent of the detection of said heartbeat synchronous wave by said first sensor means.

3. An apparatus for detecting a pulse wave produced from an arterial vessel of a subject in synchronization with heartbeat of the subject, comprising:

a probe which is adapted to be set on a body portion of said subject;

first sensor means supported by said probe, for detecting a pulse wave produced from an arterial vessel in said body portion of said subject;

second sensor means supported by said probe, for detecting a high frequency electric current flowing from an electric knife to said probe via said body portion, the detection of said high frequency electric current being independent of the detection of said pulse wave; and

judging means for judging whether or not said electric knife is being used on said subject, based on the detected high frequency electric current.

4. The apparatus as set forth in claim 3, further comprising means for ceasing, if said judging means judges that said electric knife is being used, from reading in said pulse wave detected by said first sensor means.

5. The apparatus as set forth in claim 3, further comprising

means for discarding, if said judging means judges that said electric knife is being used, the heartbeat pulse wave detected when said electric knife is being used.

6. The apparatus as set forth in claim 3, wherein said sensor means comprises

at least one pressure sensing element, and

a temperature sensing resistor means for sensing a temperature of said at least one pressure sensing element, said resistor means producing an electric signal representative of a body temperature of said body portion of said subject,

said second sensor means comprising said temperature sensing resistor means, a magnitude of said electric signal being changeable upon flowing of said high frequency electric current to said at least one pressure sensing element via said body portion of said subject, said second sensor means detecting said high frequency electric current based on the changed magnitude of said electric signal.

7. The apparatus as set forth in claim 3, wherein said probe comprises

a housing including a first and a second portion each formed of an electrically conductive material, and an electrically insulating member inserted between said first and second portions, said first portion being grounded and spaced from said body portion of said subject while said second portion contacting said body portion,

said second sensor means comprising said housing, and a resistor member connected at opposite ends thereof to said first and second portions of said housing, respectively, a voltage between the opposite ends of said resistor member being changeable upon flowing of said high frequency electric current to said second portion of said housing via said body portion of said subject, said second sensor means detecting said high frequency electric current based on the changed voltage between the opposite ends of said resistor member.

8. The apparatus as set forth in claim 3, wherein said judging means judges that said electric knife is being used, if said judging means detects a high frequency electric current greater than a first reference value.

9. The apparatus as set forth in claim 8, wherein said judging means judges that said electric knife is being used, if said judging means continues to detect said high frequency electric current for more than a first reference time.

10. The apparatus as set forth in claim 9, further comprising, when said judging means is a first judging means,

a second judging means for judging whether or not said electric knife is not being used any longer after use thereof.

11. The apparatus as set forth in claim 10, wherein said second judging means judges that said electric knife is not being used any longer, if said second judging means detects that the high frequency electric current greater than said first reference value has become smaller than a second reference value smaller than said first reference value.

12. The apparatus as set forth in claim 11, wherein said second judging means judges that said electric knife is not being used any longer, if said second judging means continues to detect the high frequency electric current smaller than said second reference value for more than a second reference time.

13. The apparatus as set forth in claim 12, wherein said second judging means further judges whether or not said subject has become free from said high frequency electric current and highly stable after the use of said electric knife.

14. The apparatus as set forth in claim 3, further comprising

means for storing the pulse wave detected by said first sensor means when said electric knife is not being used, and

means for utilizing, if said judging means judges that said electric knife is being used, the pulse wave detected and stored before the use of said electric knife.

15. The apparatus as set forth in claim 3, further comprising means for determining a blood pressure of said subject based on the pulse wave detected by said first sensor means when the electric knife is not being used on said subject.

16. An apparatus for detecting a heartbeat synchronous wave produced from a subject in synchronization with heartbeat of the subject, comprising:

a probe which is adapted to be set on a body portion of said subject;

sensor means for detecting said heartbeat synchronous wave produced from said subject, said sensor means being supported by said probe;

judging means for detecting a high frequency electric current flowing from an electric knife to said probe via said body portion, and judging whether or not said electric knife is being used on said subject, based on the detected high frequency electric current;

said sensor means comprising at least one pressure sensing element, and a temperature sensing resistor means for sensing a temperature of said at least one pressure sensing element, said resistor means producing an electric signal representative of a body temperature of said body portion of said subject; and

said judging means comprising said temperature sensing resistor means, a magnitude of said electric signal being changeable upon flowing of said high frequency electric current to said at least one pressure sensing element via said body portion of said subject, said judging means detecting said high frequency electric current based on the changed magnitude of said electric signal.

17. An apparatus for detecting a heartbeat synchronous wave produced from a subject in synchronization with heartbeat of the subject, comprising:

a probe which is adapted to be set on a body portion of said subject;

sensor means for detecting said heartbeat synchronous wave produced from said subject, said sensor means being supported by said probe;

judging means for detecting a high frequency electric current flowing from an electric knife to said probe via said body portion, and judging whether or not said electric knife is being used on said subject, based on the detected high frequency electric current;

said probe comprising a housing including a first and a second portion each formed of an electrically conductive material, and an electrically insulating member inserted between said first and second portions, said first portion being grounded and spaced from said body portion of said subject while said second portion contacts said body portion; and

said judging means comprising said housing, and a resistor member connected at opposite ends thereof to said first and second portions of said housing, respectively, a voltage between the opposite ends of said resistor member being changeable upon flowing of said high frequency electric current to said second portion of said housing via said body portion of said subject, said judging means detecting said high frequency electric current based on the changed voltage between the opposite ends of said resistor member.

18. An apparatus for detecting a heartbeat synchronous wave produced from a subject in synchronization with heartbeat of the subject, comprising:

a probe which is adapted to be set on a body portion of said subject;

sensor means for detecting said heartbeat synchronous wave produced from said subject, said sensor means being supported by said probe;

first judging means for detecting a high frequency electric current flowing from an electric knife to said probe via said body portion, and judging whether or not said electric knife is being used on said subject, based on the detected high frequency electric current;

wherein said first judging means judges that said electric knife is being used, if said judging means detects a high frequency electric current greater than a first reference value for more than a first reference time; and

second judging means for judging whether or not said electric knife is not being used any longer after use thereof, if said second judging means detects that the high frequency electric current greater than said first reference value has become smaller than a second reference value smaller than said first reference value.

19. The apparatus as set forth in claim 18, wherein said second judging means judges that said electric knife is not being use any longer, if said second judging means continues to detect the high frequency electric current smaller than said second reference value for more than a second reference time.

20. The apparatus as set forth in claim 19, wherein said second judging means further judges whether or not said subject has become from said high frequency electric current and is highly stable after the use of said electric knife.