To provide a myoelectric potential acquisition apparatus that acquires the maximum myoelectric potential for satisfying the accuracy serving as the standard of a botulinum toxin dosage unit to a botulinum therapy patient.SOLUTION: A myoelectric potential acquisition apparatus has: biomedical electrodes 11, 11 affixed to a patient； a myoelectric potential acquisition unit 12 for acquiring multiple myoelectric potential derived from the biomedical electrodes 11, 11 for every predetermined time elapse in patient's arousal； an amplification rectification unit 13 for amplifying and rectifying the multiple myoelectric potential acquired by the myoelectric potential acquisition unit 12, and thereby generating it as multiple myoelectric potential signals； a maximum myoelectric potential extraction unit 14 for extracting the maximum myoelectric potential for every multiple myoelectric potential signal generated by the amplification rectification unit 13； and a medication standard determination unit 15 for assuming the largest maximum myoelectric potential among the multiple maximum myoelectric potential as the standard maximum myoelectric potential, and determining whether or not the standard maximum myoelectric potential satisfies a predetermined condition. The medication standard determination unit 15 determines that the standard maximum myoelectric potential is the standard of the dosage unit when satisfying the predetermined condition.SELECTED DRAWING: Figure 1【課題】ボツリヌス療法患者に対するボツリヌストキシン投与単位の基準となる精度を満たす最大筋電位を取得する筋電位取得装置を提供する。【解決手段】患者に貼付される生体用電極１１、１１と、患者の覚醒時に所定時間経過毎に生体用電極１１、１１から導出された複数の筋電位を取得する筋電位取得部１２と、筋電位取得部１２で取得された複数の筋電位を増幅し、且つ整流化することにより複数の筋電位信号として生成する増幅整流部１３と、増幅整流部１３により生成された複数の筋電位信号毎の最大筋電位を抽出する最大筋電位抽出部１４と、複数の最大筋電位の内、最も大きい最大筋電位を基準最大筋電位とし、基準最大筋電位が所定の条件を満たすか否かを判定する投薬基準判定部１５とを有し、投薬基準判定部１５は、基準最大筋電位が所定の条件を満たす場合、投与単位の基準と判定する。【選択図】図１
