US 12,070,545 B2
Wound therapy system with conduit blockage detection
Christopher B. Locke, Bournemouth (GB)
Assigned to Solventum Intellectual Properties Company, Maplewood, MN (US)
Appl. No. 17/259,273
Filed by KCI LICENSING, INC., San Antonio, TX (US)
PCT Filed Jul. 10, 2019, PCT No. PCT/US2019/041244
§ 371(c)(1), (2) Date Jan. 11, 2021,
PCT Pub. No. WO2020/018328, PCT Pub. Date Jan. 23, 2020.
Claims priority of provisional application 62/698,405, filed on Jul. 16, 2018.
Prior Publication US 2021/0275737 A1, Sep. 9, 2021
Int. Cl. A61M 1/00 (2006.01)
CPC A61M 1/96 (2021.05) [A61M 1/962 (2021.05); A61M 1/92 (2021.05); A61M 2205/18 (2013.01); A61M 2205/3344 (2013.01); A61M 2205/3553 (2013.01); A61M 2205/502 (2013.01); A61M 2205/584 (2013.01); A61M 2205/75 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A wound therapy system comprising:
a canister including a first chamber configured to contain fluid removed from a wound site;
a primary conduit having a first end coupled to the canister and a second end coupled to the wound site;
a pump fluidly coupled to the wound site via the primary conduit and configured to apply negative pressure to the wound site via the primary conduit;
a pressure indicator configured to indicate a negative pressure at the pressure indicator;
a second chamber fluidly isolated from the first chamber, wherein the pressure indicator is located within the second chamber, and wherein the second chamber is configured to controllably leak air into the second chamber at a controlled leak rate; and
a secondary conduit having a first end and a second end, the first end of the secondary conduit fluidly coupled to the pressure indicator and the second chamber, the second end of the secondary conduit coupled to the wound site such that the negative pressure at the wound site is fluidly transmitted to the pressure indicator and the second chamber via the secondary conduit;
wherein a blockage in the primary conduit causes the negative pressure indicated by the pressure indicator to differ from the negative pressure applied by the pump, and wherein the pump is configured to remove the air from the second chamber via the secondary conduit and the primary conduit at an air removal rate greater than the controlled leak rate, causing the negative pressure at the pressure indicator to be substantially equal to the negative pressure applied by the pump before the blockage occurs.