초록 ▼

An implantable medical device which preferably has a segmented looping memory for storing triggered physiologic events also has autotriggers to record the ECGs and any other relevant physiologic signals occurring during triggering events. The problem is that in the far field R-wave sensing is diffic

An implantable medical device which preferably has a segmented looping memory for storing triggered physiologic events also has autotriggers to record the ECGs and any other relevant physiologic signals occurring during triggering events. The problem is that in the far field R-wave sensing is difficult because of noise. Denial and extensible accommodation periods are introduced into the R-wave sensing registration for triggering data storage. If the event is sensed during an accommodation period the sense will not add an R-wave sense to the trigger's count of R-waves. It may cause resetting of the trigger count in some circumstnaces. Typical triggering events may include arrhythmia's and syncopal events. Preferably the device can function without a microprocessor. An outside device or other patient activated manual trigger may be included. Auto triggers and manually set triggers may be of different sizes. Electrode spacing can be critical. Additional sensors may be provided to the device. Preferred communications with the device is through telemetry such as is used for pacemakers and other implanted devices.

대표청구항 ▼

[ What is claimed is:] [1.]1. An implantable medical device for sensing electrocardiograms in the far field having a memory in a housing for storing said far field ECGs, comprising;electrodes outside said housing of said implantable medical device, for use in the far field,sense amplifier and QRS de

[ What is claimed is:] [1.]1. An implantable medical device for sensing electrocardiograms in the far field having a memory in a housing for storing said far field ECGs, comprising;electrodes outside said housing of said implantable medical device, for use in the far field,sense amplifier and QRS detector circuit in said housing, connected to said electrodes for sensing apparent R-waves and for issuing an apparent R-wave detection signal when a predetermined characteristic of a QRS complex is detected by said detector circuit,accommodation period processing circuit connected to receive said detection signals from said detector circuit, for initiating and timing until it expires, an accommodation period after said processing circuit receives a said detection signal, and for extending said accommodation period if a next detection signal is received from said detector circuit during an accommodation period, but for passing an R-wave detected signal if said next detection signal is received after an accommodation period has expired, anda trigger circuit, for receiving said passed signals from said processing circuit and for initiating and timing until it expires, a pending trigger period, wherein if a predetermined number of passed signals is received by said trigger circuit when said trigger period expires, said trigger circuit triggers stores into said memory a segment of said far field ECG.