[Design and application of an intermittent urination device].

Clamping training has a protective effect on bladder function. However, due to the risk of excessive bladder distension, it has not been widely applied in clinical practice over the past century, with continuous drainage remaining the predominant approach. The China National Health Industry Standard WS/T 509-2016 Specifications for Prevention and Control of Healthcare-associated Infections in Intensive Care Units explicitly stipulates that indwelling urinary catheters should be kept continuously clamped and opened at regular intervals. To date, this requirement has not been extensively implemented, primarily due to the persistent risk of excessive bladder distension. In patients with elevated intra-abdominal pressure, traditional clamping training tends to induce increased intravesical pressure without adequate bladder filling, which may further lead to upper urinary tract injury. To address this clinical dilemma, the critical care medical staff at Fourth People's Hospital of Sichuan Province have designed a passive intermittent urination device for clamping training. This device can ensure sufficient bladder filling while eliminating the risk of overdistension. Currently, the device has been granted a national invention patent (patent number: ZL 2017 1 1242878.6). Its core mechanism involves shaping the external urinary catheter into a "Ji"-shaped configuration. It utilizes the hydrostatic pressure generated by the height of urine column in the catheter to prevent urine outflow, thereby ensuring proper bladder distension. When the intravesical pressure exceeds the preset hydrostatic pressure threshold, urine is automatically drained out, which effectively prevents excessive bladder distension. Meanwhile, the device is not affected by high intra-abdominal pressure and can stably maintain the optimal bladder filling state. Innovatively, this device adopts a liquid barrier (urine) to replace the conventional solid barrier. It not only circumvents the risk of excessive bladder distension during clamping training but also avoids insufficient bladder filling caused by the interference of intra-abdominal pressure with intravesical pressure, thus achieving both efficacy and safety of clamping training. With its simple structure, convenient operation and no need for power supply, this device is expected to facilitate the popularization of clamping training, and further promote its replacement of continuous drainage to become the mainstream clinical practice.