Enhanced chest compressor
US9913776B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2014 |
| Grant date | Mar 13, 2018 |
| Priority date | — |
| Expiry date | Jul 23, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61H2201/1246
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A chest compressor includes a piston (14) that moves in downward and upward strokes within a cylinder (12), with the piston undergoing a smooth reversal at the bottom of the downward stroke. A compression spring, such as a wave spring (60), is positioned to engage the piston only near the end of its downward stroke, to smoothly reverse the piston motion, limit downward force on the patient at the end of the stroke, and avoid a downward pulse due to the momentum of the downwardly-moving piston. A stop (90, 92) is latchable in an inward position to allow reduction in the piston stroke by engaging an outward flange (52) on the piston before the piston has moved fully downward. In one embodiment the piston (14) is made as an outer piston part (40) and an inner piston part (42) that telescope in one another in which the outer piston part is slidably engaged with and guided by the cylinder along a path and the inner piston part is slidably engaged with and guided by the outer piston part and the spring (60) engages the inner piston part near the end of its downward stroke, to smoothly reverse the piston motion, limit downward force on the patient at the end of the stroke, and avoid a dow…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.