Negative pressure pumps and related methods
Inventors
Hassenpflug, Eric • Bartholomew, John • MADLAND, Steven • Holley, David • TALLARICO, John P. • Hooks, Jr., Larry K. • Bennison, Corrie • Atterbury, William G. • Ulrich, Michael Scott • Kittel, Russell • Ellis, Jeffrey L. • Haubert, Thomas
Assignees
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Publication Number
US-10548778-B2
Publication Date
2020-02-04
Expiration Date
Abstract
Devices and systems disclosed herein may include a negative pressure pump that includes a reservoir defining a lumen and a longitudinal axis, a piston, and a drive assembly comprising a spring. Motion of the spring may move the piston along the longitudinal axis of the reservoir to create a negative pressure within the reservoir. Methods of manufacturing a negative pressure pump and using a negative pressure pump to remove fluid from a target site are also described.
Core Innovation
The invention relates to a negative pressure pump that includes a reservoir having an inner wall defining a lumen along a longitudinal axis. A piston forms a seal against the inner wall and is slidable within the lumen along the longitudinal axis. A drive assembly coupled to the reservoir generates negative pressure within the lumen by moving the piston along the reservoir.
The drive assembly comprises a spring, a first drum, and a second drum. A cable extends through the lumen, with a first end coupled to the drive assembly at a cable attachment point located on the second drum and a second end coupled to the piston. When the piston is slid along the reservoir via the drive assembly, negative pressure is created within the lumen.
In related medical-system embodiments, a manifold places the pump in communication with a target site. In such systems, motion of the spring moves the piston within the lumen to create a negative pressure within the reservoir. Additional disclosed variants include disposable reservoirs, reusable drive units with disposable reservoirs, and pressure-actuated negative pressure pump embodiments.
Claims Coverage
The independent claims define three main inventive scopes: a negative pressure pump structure, a method for removing fluid from a target site, and a method of manufacturing the negative pressure pump. Across these independent claims, the inventive concept centers on spring-driven piston displacement sealed in a lumen, with drive-and-cable drum architecture producing negative pressure, and optionally using a manifold to communicate with a target site.
Spring and drum-driven piston sealed in a reservoir lumen
A negative pressure pump including a reservoir with an inner wall defining a lumen along a longitudinal axis, a piston forming a seal against the inner wall and slidable within the lumen along the longitudinal axis, and a drive assembly coupled to the reservoir comprising a spring, a first drum, and a second drum, wherein sliding the piston along the reservoir via the drive assembly creates a negative pressure within the lumen.
Cable through the reservoir lumen to couple the drive assembly and piston
The negative pressure pump further includes a cable extending through the lumen, the cable having a first end coupled to the drive assembly at a cable attachment point located on the second drum and a second end coupled to the piston, such that motion of the spring through the drive assembly moves the piston to create negative pressure within the lumen.
Manifold in communication with reservoir for removing fluid from a target site
A method of removing fluid from a target site by placing a first end of a manifold at the target site and coupling a second end of the manifold to a negative pressure pump having a reservoir with an inner wall defining a lumen along a longitudinal axis, wherein the manifold is in communication with the reservoir, and initiating the drive assembly so that motion of the spring moves the piston within the lumen to create negative pressure within the reservoir.
Spring winding from a first drum to a second drum during manufacturing
A method of manufacturing a negative pressure pump comprising a drive assembly, a reservoir, and a piston by biasing a spring of the drive assembly to wind from a first drum to a second drum, where the reservoir has an inner wall defining a lumen along a longitudinal axis and the drive assembly is coupled to the piston by a cable extending through the lumen of the reservoir.
Overall, the independent claims cover a reservoir-lumen piston sealed to generate negative pressure when moved by a spring-and-drum drive, coupling of the drive to the piston via a cable extending through the lumen with a cable attachment point on the second drum, using a manifold in communication with the reservoir for removing fluid from a target site, and manufacturing the pump by biasing a spring to wind from a first drum to a second drum with a cable extending through the reservoir lumen to couple to the piston.
Stated Advantages
Documented Applications
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