| 摘要 |
The present invention relates to a medical apparatus (1) for detecting changes in the cross section of an elongate body cavity, for example a human urinary tract. The apparatus comprises a retainer portion (60) and a sensor portion (10) connected to the retainer portion and comprising a sensitive body (30) of flexible material. The sensor portion includes a first end portion which is fixed to the retainer device (60). The sensitive body is designed as a catheter-like device projecting from the retainer portion (60) and provided in its free end (17) with a rigid closure (37). The sensitive body is a hollow body whose cavity (12) constitutes a part of a closed cavity in which the pressure varies in response to the compression of the sensitive body (30). A pressure-sensing device (15) indicates the size of the pressure in the cavity (13).
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