US2019192746A1PendingUtilityA1

Method for providing negative pressure to a negative pressure wound therapy bandage

63
Assignee: SMITH & NEPHEW INCPriority: May 26, 2011Filed: Dec 27, 2018Published: Jun 27, 2019
Est. expiryMay 26, 2031(~4.9 yrs left)· nominal 20-yr term from priority
Inventors:John BuanRichard Willems
A61M 2210/04A61M 1/00A61B 13/00A61M 2205/33A61F 2013/00174A61F 2013/00536A61P 17/02A61M 1/0031A61M 1/0088A61M 1/0037A61F 13/00068A61M 1/96A61M 1/74A61M 1/75A61F 13/05
63
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Claims

Abstract

A method for providing a negative pressure wherein a pump is cycled on and off to achieve a target negative pressure, which is set slightly lower than the therapeutic negative pressure. A device determines the actual pressure by averaging samples which may occur at a different rate than the pump cycle.

Claims

exact text as granted — not AI-modified
1 .- 17 . (canceled) 
     
     
         18 . A method of operating a negative pressure wound therapy device, the method comprising, by a controller of the negative pressure wound therapy device:
 operating a source of negative pressure of the negative pressure wound therapy device in a first mode to provide negative pressure to a wound covered by a wound dressing, the source of negative pressure configured to be fluidically connected to the wound;   determining pressure at the wound;   comparing the pressure at the wound to a target negative pressure;   in response to determining that the target negative pressure has not been established at the wound, continue operating the source of negative pressure in the first mode; and   in response to determining that the target negative pressure has been established at the wound, operating the source of negative pressure in a second mode in which less power is consumed than in the first mode.   
     
     
         19 . The method of  claim 18 , wherein operating the source of negative pressure in the first mode comprises cycling the source of negative pressure on and off to provide negative pressure to the wound. 
     
     
         20 . The method of  claim 18 , further comprising, in the second mode, in response to determining that the pressure at the wound is more positive than the target negative pressure, activating the source of negative pressure. 
     
     
         21 . The method of  claim 20 , further comprising activating the source of negative pressure for one cycle. 
     
     
         22 . The method of  claim 20 , further comprising, in response to determining that the pressure at the wound is more positive than the target negative pressure, operating the source of negative pressure in the first mode. 
     
     
         23 . The method of  claim 18 , further comprising, in the first mode, determining the pressure at the wound at a first sampling rate and, in the second mode, determining the pressure at the wound at a second sampling rate lower than the first sampling rate. 
     
     
         24 . The method of  claim 23 , further comprising, by the controller, indicating a presence of a leak in response to determining that the source of negative pressure has been activated more than a threshold number of activations over a time period. 
     
     
         25 . The method of  claim 18 , wherein determining the pressure at the wound comprises averaging a plurality of pressures at the wound. 
     
     
         26 . The method of  claim 25 , wherein comparing the pressure at the wound to the target negative pressure comprises comparing the average pressure to the target negative pressure. 
     
     
         27 . The method of  claim 18 , wherein the target negative pressure is between −40 mmHg to −125 mmHg. 
     
     
         28 . A negative pressure wound therapy apparatus comprising:
 a source of negative pressure configured to provide negative pressure to a wound covered by a wound dressing, the source of negative pressure configured to be fluidically connected to the wound;   a pressure sensor configured to determine pressure at the wound; and   a controller configured to:
 operate the source of negative pressure in a first mode; 
 determine pressure at the wound; 
 compare the pressure at the wound to a target negative pressure; 
 in response to determining that the target negative pressure has not been established at the wound, continue operating the source of negative pressure in the first mode; and 
 in response to determining that the target negative pressure has been established at the wound, operate the source of negative pressure in a second mode in which less power is consumed than in the first mode. 
   
     
     
         29 . The apparatus of  claim 28 , wherein the controller is further configured to:
 operate the source of negative pressure in the first mode by cycling the source of negative pressure on and off to provide negative pressure to the wound.   
     
     
         30 . The apparatus of  claim 28 , wherein the controller is further configured to:
 in response to determining that the pressure at the wound is more positive than the target negative pressure in the second mode, activate the source of negative pressure.   
     
     
         31 . The apparatus of  claim 30 , wherein the controller is further configured to:
 activate the source of negative pressure for one cycle.   
     
     
         32 . The apparatus of  claim 30 , wherein the controller is further configured to:
 in response to determining that the pressure at the wound is more positive than the target negative pressure, operate the source of negative pressure in the first mode.   
     
     
         33 . The apparatus of  claim 28 , wherein the controller is further configured to:
 in the first mode, determine the pressure at the wound at a first sampling rate; and   in the second mode, determine the pressure at the wound at a second sampling rate lower than the first sampling rate.   
     
     
         34 . The apparatus of  claim 33 , wherein the controller is further configured to:
 indicate a presence of a leak in response to determining that the source of negative pressure has been activated more than a threshold number of activations over a time period.   
     
     
         35 . The apparatus of  claim 28 , wherein the controller is further configured to:
 determine the pressure at the wound by averaging a plurality of pressures at the wound.   
     
     
         36 . The apparatus of  claim 35 , wherein comparing the pressure at the wound to the target negative pressure comprises comparing the average pressure to the target negative pressure. 
     
     
         37 . The apparatus of  claim 28 , wherein the target negative pressure is between −40 mmHg to −125 mmHg.

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