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The Newmarket pump: a new suction pump for external negative pressure ventilation
Thorax
|September 1, 1985
Summary
A new servo-controlled pump enhances external negative pressure ventilation, offering improved portability and precise pressure regulation for patients with nocturnal hypoxaemia. This device makes non-invasive ventilation more accessible and reliable for home use.
Area of Science:
- Biomedical Engineering
- Respiratory Medicine
Background:
- External negative pressure ventilation (ENPV) is crucial for managing respiratory insufficiency.
- Existing ENPV pumps can be bulky and less adaptable.
- A need exists for more advanced, user-friendly ENPV devices.
Purpose of the Study:
- To introduce and evaluate a novel, electronically controlled pump for ENPV.
- To assess the pump's performance, versatility, and patient acceptance.
Main Methods:
- Development of a servo-controlled pump with a rotary valve and pressure transducer.
- Testing in 21 patients with nocturnal hypoxaemia using cuirass ventilation.
- Performance comparison with an existing pump (Cape pump) in 14 patients.
- Overnight monitoring of cuirass pressure control.
Main Results:
- The new pump demonstrated precise control of cuirass pressure, following a sine wave pattern.
- Tidal volume increased with suction pressure; I/E ratio adjustments showed minor effects.
- Similar tidal volumes were achieved compared to the Cape pump.
- The Newmarket pump offered more even control of peak negative pressure.
- Ten pumps are in clinical use with no major issues reported.
Conclusions:
- The new electronically controlled pump is smaller, lighter, and more versatile than existing models.
- It provides reliable and adjustable external negative pressure ventilation.
- The device enhances patient comfort and acceptance of ENPV for home use.