| 摘要 |
A fetal monitoring device comprises a cap (10) with internal electrode (12) and recess (16). A sealing edge (14) against which fetal tissue (50) is sealed in use is provided by the cap (10) and electrode (12). A reduced pressure is applied within the recess (16) by a piston (38, 40) and cylinder (36) device through holes (24), valve chamber (32), passage (28) and cross passages (30). A valve disk (34) seals the passage (28) so as to maintain the recess (16) sealed in use after removal of the piston and cylinder device. |
