Patent ID: 11865063
Assignee: HEARTSINE TECHNOLOGIES LIMITED
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 15:
16. A defibrillator which assesses chest recoil of a subject during cardio pulmonary resuscitation (CPR) carried out by a rescuer on the subject and provides feedback to the rescuer, the defibrillator comprising:
a bio-signal measurement system configured to measure bio-signals of the subject, identify when CPR is required and produce a CPR start signal and identify when CPR is to be ceased and produce a CPR stop signal,
an impedance measurement system configured to measure impedance signals of the subject,
a CPR assessment system connected to the bio-signal measurement system to receive the CPR start signal and the CPR stop signal, wherein the CPR assessments system is also connected to the impedance measurement system to receive impedance signals and configured to perform the steps:
(i) receiving the CPR start signal and produce a first feedback signal,
(ii) receiving an impedance signal of the subject measured during a plurality of CPR chest compressions by the rescuer,
(iii) use the impedance signal to assess chest recoil of the subject during the plurality of CPR chest compressions,
(iv) comparing the chest recoil of the subject with a chest recoil threshold,
(v) when the chest recoil of the subject is greater than the chest recoil threshold, producing a second feedback signal and going to step (vii),
(vi) when the chest recoil of the subject is less than the chest recoil threshold, producing a third feedback signal and going to step (vii),
(vii) when the CPR stop signal is not received, returning to step (ii),
(viii) when the CPR stop signal is received, producing a fourth feedback signal, and

a feedback unit connected to the CPR assessment system configured to receive the feedback signals and to issue CPR feedback information to the rescuer.