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Electronic EKG measurement mode selection system

  • US 4,378,021 A
  • Filed: 02/18/1981
  • Issued: 03/29/1983
  • Est. Priority Date: 02/18/1981
  • Status: Expired due to Fees
First Claim
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1. A medical lead selection system comprising:

  • (a) a series of electronic lead select modules for disposition at respective bedside monitoring stations,(b) each electronic lead select module having;

    (b1) a series of input leads for electrical coupling with a patient for receiving respective electrical activity signals,(b2) a measuring network having respective network inputs connected with the respective input leads, and having network outputs for supplying a predetermined set of electrical measurement signals,(b3) a measurement display channel having first and second measurement channel conductors for selective connection with respective different pairs of the network outputs to receive respective different ones of said predetermined set of electrical measurement signals,(b4) respective relay means having a first series of relay contacts interposed between different network outputs and said first measurement channel conductor, and having a second series of relay contacts interposed between different network outputs and said second measurement channel conductor,(b5) pulse responsive shift register means having pulse input means and a series of bistable shift register stages with respective logic signal outputs, said pulse responsive shift register means having setup means for placing a first one of said shift register stages in an active state in response to a pulse at said pulse input means while each of the remaining shift register stages is in an inactive state, and being responsive thereafter to respective control pulses supplied to said pulse input means to place successive ones of said bistable shift register stages of said series into an active state while a preceding one of said shift register stages is returned to said inactive state, thereby to activate successive ones of said logic signal outputs one at a time,(b6) circuit means coupling respective logic signal outputs with the respective relay means for controlling actuation thereof such that successive control pulses supplied to said pulse input means of said pulse responsive shift register means activate respective relay contacts of said first and second series of relay contacts to supply the respective different electrical measurement signals of said predetermined set to said measurement display channel in a predetermined sequence, and(b7) manually controlled pulser means connected with said pulse input means and operative in response to manual actuation thereof to effect the supply of successive pulses to said pulse responsive shift register means, whereby manual actuation of the manually controlled pulser means effects the display of the predetermined set of electrical measurement signals in said predetermined sequence,(c) a central lead select module for disposition at a central station and for coupling with each of said electronic lead select modules,(d) said central lead select module comprising;

    (d1) a series of matrix display elements each matrix display element being operable for displaying a sequence of indications for representing the respective different ones of said predetermined set of electrical measurement signals,(d2) a series of counter stages each having a counter input responsive to successive actuating pulses to assume sequential count conditions, each having a counter output coupled with a respective one of said matrix display elements for controlling the same to display said sequence of indications in response to sequential count conditions of the respective corresponding counter stage, and said counter stages each having a reset input responsive to a resetting signal to assume an initial count condition,(d3) a series of respective manually controlled pulsers assigned to respective ones of said series of matrix display elements, and being operative for supplying respective control pulses in response to respective manual actuations,(e) circuit means for coupling each of said manually controlled pulsers with the pulse input means of one of said pulse responsive shift register means, such that successive manual actuations of one of said manually controlled pulsers is operative to successively actuate an associated one of said shift register means so as to activate successive ones of the logic signal outputs thereof,(f) a series of control pulse monitor circuits each coupling the pulse input means of one of said shift register means with the counter input of one of said series of counter stages such that each control pulse transmitted to the pulse input means of the one of said shift register means is also transmitted via the associated monitor circuit to the associated one of said series of counter stages, and(g) a series of reset circuits each coupling the logic signal output of a first shift register stage of an associated one of the shift register means with the reset input of a corresponding one of said series of counter stages such that each time the associated shift register means has its first shift register stage placed in an active state the corresponding one of said series of counter stages is placed in its initial count condition.

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