Figure 1
From: Continuous controllable balloon dilation: a novel approach for cervix dilation
System for continuous controllable balloon dilation. (A)The continuous controllable balloon dilator (CCBD) system for cervical dilation. (B) Image of the CCBD. (C) CCBD with an uninflated BD (a) and an inflated BD (b). (D) The calculation of cervical resistance during cervical dilation using the CCBD: line 1, change in pressure during in vitro balloon dilation; line 2, change in pressure during in vivo cervical dilation using the CCBD; line 3,difference in the change in pressure between the in vivo and in vitro experiments, which represents the resistance of the cervical tissue to CCBD dilation. (E) Pictures of the phases of in vivo cervical dilation using the CCBD (after 10, 15, 20 and 25 seconds). (F) The comparative results of CCBD cervical dilations for three representative patients: P1, the cervical resistance of Patient 1 was depressed after 23 seconds with a pressure of 3.8 bars; P2, the cervical resistance of Patient 2 was depressed after 22 seconds with a pressure of 1.4 bars; P3, the cervical resistance of Patient 3 was depressed after 21 seconds with a pressure of 1.1 bars.