## 4 Discussions and Conclusion  
The research developed a CIC assistant system of intermittent catheterization for neurogenic bladder dysfunction patients to record their voided volume and make suggestions. The patients with CIC bladder management strategy were recruited. The cytometric capacity, intravesical pressure, and bladder compliance of these patients were in the normal range (>40 mL/cm H\({}_{2}\)O), and the bladder pressure of these patients was highly correlated with the urine volume [4; 32]. A wireless urine pot measuring device is ideal for such patients to keep a record, both indoors and outdoors. By looking at the stored data, patients understand more about the history of their catheterization volume and time period. At the same time, doctors can monitor and diagnose patients despite the distance. However, the system is not suitable for the patients with abnormal bladder function, such as abnormal bladder wall compliance caused by bladder fibrosis. By way of face-to-face discussion by clinicians under IRB's ethical principles, the patients recruited in this study agreed that the system could effectively help them keep a record and make observations automatically. This was helpful in the bladder and urinary system care and meant the occurrence of \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Questions**} & \multicolumn{2}{c}{**Travel Alone \%**} & \multicolumn{2}{c}{**Travel with Accessible Lavatory Function \%**} \\ \cline{2-5}  & **Yes** & **No** & **Yes** & **No** \\ \hline Inconvenient to find a suitable accessible toilet & 91.7 & 8.3 & 0 & 100 \\ Travel willingness & 25 & 75 & 75 & 25 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Intention to travel. Figure 7: Accessible lavatory function of (**A**) list all the nearby accessible lavatories, (**B**) detailed information of each lavatory, (**C**) estimated time of arrival and (**D**) the interface of adding a new lavatory. UTIs could be decreased. The accessible lavatory function helped patients efficiently find a suitably accessible lavatory. By reducing the instance of holding urine, patients became more prepared for better social interactions. Based on the comments and scores given by experienced users, patients felt at ease to explore a new place without any psychological barrier. A limitation of our system is that it is unable to detect the current volume of the bladder and give a catheter reminder, so the user is still troubled by drinking water, and must rely on time as the basis for catheterization. Besides this, the accessible lavatory function [29] can only be searched for its location and route navigation. A solution would be to combine a bladder monitor device and IoT device in this system. In the future, the proposed system will integrate a wearable device, capable of bladder volume estimation non-invasively, with a reminder function. Accessible lavatory navigator function with IoT device can calculate the state and the frequency of the toilet. Therefore, it can detect toilet crowdedness and prevent patients from holding urine for a long time. It is hoped that this system could improve the quality of life of patients and reduce the chance of UTIs. Equipping SCI patients with the above system enhances their sense of happiness and encourages them to enjoy outdoor-living by contacting the crowd. C.-M.H. : Designed the study and drafted the manuscript. Y.-C.D. : designed protocol and manuscript revision. J.-C.W. : Designed suggestion and revision. J.-J.J.C. : Conceived the study and revised the manuscript critically for intellectual content. J.-Y.C. : Designed the device and data analysis. All authors read and approved the final manuscript. This study is funded by the Ministry of Science and Technology of Taiwan (MOST) (grant number 106-2218-E-384-001). The authors would like to thank the nurses at the Chi Mei Medical Center who participated in this study. The authors declare that they have no competing interests.