# A novel closed chest drainage device

## TL;DR

A new portable and cost-effective device for thoracic drainage was developed to improve patient mobility and reduce costs.

## Contribution

A novel portable closed thoracic drainage device integrating a micro-pump and power system was developed and tested.

## Key findings

- The device achieved a maximum negative pressure of approximately 20 cm H₂O and an airflow rate of 15 L/min.
- Preliminary testing in three patients showed the device's potential for postoperative thoracic drainage.
- The device offers cost-effectiveness and portability compared to conventional systems.

## Abstract

Negative pressure closed thoracic drainage improves drainage efficiency, accelerates the removal of fluid and air, and facilitates lung re-expansion. Conventional wall negative pressure systems restrict patient mobility, while digital drainage devices are associated with high costs that hinder widespread clinical adoption. Hence, there is an urgent need for a cost-effective, practical, and portable negative pressure drainage system.

Based on the principles outlined in the Chinese national patent (ZL 202122505281.4), we innovatively integrated a micro-pump and power system into a compact, portable negative pressure generator, which was then connected to the pressure-regulating chamber of a conventional three-chamber closed drainage bottle. This integration resulted in a novel portable closed thoracic drainage device with active negative pressure control. The device underwent in vitro testing followed by preliminary proof-of-concept evaluation.

The test results indicate that the novel closed thoracic drainage device can achieve a maximum negative pressure of approximately 20 cm H₂O and a maximum airflow rate of 15 L/min. The novel device was initially used in three patients.

A novel type of negative pressure closed thoracic drainage device has been successfully developed and a preliminary concept verification has been carried out. This device offers the advantages of cost-effectiveness and portability, demonstrating potential for wide application in postoperative thoracic drainage following lung surgery.