JPWO2020227258A5 - - Google Patents

Claims (16)

an infusion system configured to provide infusion fluid to a wound site, including a wound and a wound dressing;
providing a first volume of infusate for a first infusion cycle;
determining a second volume of infusate for a second infusion cycle based on the first volume and the reduction factor, wherein the second volume of infusate is greater than the first volume of infusate; and configured to adjust operation of the infusion system to provide the second volume of infusate to the wound site.
a controller;
Negative pressure wound therapy (NPWT). 3. The NPWT system of claim 1, wherein the reduction factor is determined based on the negative pressure of a negative pressure cycle and the duration of the negative pressure cycle. 3. The NPWT system of claim 1, wherein the reduction factor is determined based on the amount of compression of the wound dressing over time. 3. The NPWT system of claim 1, wherein the wound dressing comprises one or more foam pieces. 2. The controller of claim 1, wherein the controller is configured to receive an initial wound volume value from a user interface and to determine the first volume of infusate using the initial wound volume value. NPWT system as described in . The controller is configured to determine the second amount of infusate for the second infusion cycle by determining a reduction amount based on the reduction factor and the first amount. 2. The NPWT system of claim 1, wherein 7. The NPWT system of claim 6, wherein said second quantity is the difference between said first quantity and said first quantity multiplied by said reduction factor. 3. The NPWT system of claim 1, wherein said reduction factor is a normalized value. 3. The NPWT system of claim 1, wherein the controller is configured to select the reduction factor from a database of reduction factors based on the negative pressure of a negative pressure cycle and the duration of the negative pressure cycle. An NPWT device configured to provide fluid to a wound and create a negative pressure at the wound for NPWT, comprising:
monitoring the negative pressure in the wound and the elapsed amount of treatment time;
selecting a reduction factor based on the monitored negative pressure at the wound and the monitored amount of treatment time;
determining a reduced value of fluid volume to provide to the wound and based on the previous value of fluid volume provided to the wound and the reduction factor, and the reduced value of fluid to the NPWT device; a controller configured to cause a volume to be provided to the wound;
The NPWT device, wherein the reduced value fluid volume is less than the previous value fluid volume provided to the wound. 11. The NPWT device of claim 10, wherein said reduction factor is a percentage value. 12. The NPWT device of claim 11, wherein the reduced value liquid volume is determined by decreasing the previous value liquid volume by the percentage value. wherein said percentage value selected by said controller is between 3 and 6 percent when said monitored negative pressure at said wound is between 70 and 80 mmHg and said elapsed treatment time is a predetermined amount of time. 12. The NPWT device according to item 11. wherein said percentage value selected by said controller is between 7 and 9 percent when said monitored negative pressure at said wound is between 145 and 155 mmHg and said elapsed treatment time is a predetermined amount of time. 12. The NPWT device according to Item 11. wherein said percentage value selected by said controller is between 9 and 11 percent when said monitored negative pressure at said wound is between 195 and 205 mmHg and said elapsed treatment time is a predetermined amount of time. 12. The NPWT device according to item 11. 11. The NPWT device of claim 10, wherein the reduction factor is determined based on an empirical relationship between the amount of treatment time at negative pressure values and the amount of wound dressing compression.