US 12,144,919 B2
Fluid drainage device
Karl-Heinz Schmitt, Sandton (ZA); and Clinton Frederick Shahim, Sandton (ZA)
Assigned to XPELLA (PTY) LTD, Sandton (ZA)
Appl. No. 17/429,970
Filed by Xpella (Pty) Ltd, Sandton (ZA)
PCT Filed Feb. 11, 2020, PCT No. PCT/ZA2020/050015
§ 371(c)(1), (2) Date Aug. 11, 2021,
PCT Pub. No. WO2020/168366, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019/00880 (ZA), filed on Feb. 11, 2019.
Prior Publication US 2022/0143298 A1, May 12, 2022
Int. Cl. A61M 1/00 (2006.01)
CPC A61M 1/63 (2021.05) [A61M 1/67 (2021.05); A61M 1/815 (2021.05); A61M 1/96 (2021.05); A61M 1/98 (2021.05); A61M 1/985 (2021.05); A61M 1/964 (2021.05)] 19 Claims
OG exemplary drawing
 
1. A fluid drainage device (10, 10A) for use in applying a negative pressure to a wound site, the fluid drainage device (10, 10A) including a body (12) with an outer surface (14), a cylindrical bore (18), formed in the body (12), which defines at least part of a fluid-receiving volume (26), structure (38), at least partly on the outer surface (14) of the body (12), which forms an inlet (42) to and an outlet (44) from the fluid-receiving volume (26), a cover (60) which includes an inlet port (68) and an outlet port (70), wherein the cover (60) is movable relative to the body (12) between a first limiting position at which the inlet port (68) is in fluid communication with the inlet (42) and hence with the fluid-receiving volume (26) and fluid flow through the outlet (44) is prevented, and a second limiting position at which the outlet port (70) is in fluid communication with the outlet (44) and hence the fluid-receiving volume (26) and fluid flow through the inlet (42) is prevented, a piston (20) which is in sealing contact with the bore (18) and which partly bounds the fluid-receiving volume (26), the piston (20) being movable inside the bore (18) between a first position and a second position, a piston rod (28) which extends from the piston (20), an energy storage device (30) engaged with the piston rod (28), a user-actuated handle mechanism (16) which is moveable relative to the body (12) in a first direction to cause the piston (20) to move to the first position and to store energy in the energy storage device (30) so that, when the cover (60) is in the first limiting position and the user-actuated handle mechanism (16) is moved relative to the body (12) in a second direction opposite the first direction, the piston (20) is moveable by the action of energy released from the energy storage device (30) away from the first position towards the second position thereby causing a reduction in pressure in the fluid-receiving volume (26) and allowing fluid flow, in use of the device (10, 10A), to the fluid-receiving volume (26) through the inlet port (68) and, with the piston (20) in the second position and with the cover (60) in the second limiting position, movement of the user-actuable handle mechanism (16) relative to the body (12) in the first direction causes the piston (20) to be moved towards the first position thereby expelling fluid from the fluid-receiving volume (26) through the outlet port (70), wherein the structure (38) includes respective openings in the outer surface (14) of the body (12) to provide the inlet (42) and the outlet (44) from, the fluid receiving volume (26).