Apparatus and method for wound volume measurement

• US 8,814,841 B2
• Filed: 10/07/2008
• Issued: 08/26/2014
• Est. Priority Date: 12/06/2007
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Hartwell, Edward
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): TREYGER, ILYA Y
• Application Number:
  US12/746,492
• Publication Number:
  US 20100286489A1
• Time in Patent Office: 2,149 Days
• Field of Search: 604/315, 604/316, 604/318, 604/319
• US Class Current: 604/319
• CPC Class Codes: A61B 5/0055 by applying suction
• CPC Class Codes: A61B 5/107 Measuring physical dimensions, e.g. size of the entire body or parts thereof
• CPC Class Codes: A61B 5/1073 Measuring volume, e.g. of limbs
• CPC Class Codes: A61B 5/445 Evaluating skin irritation or skin trauma, e.g. rash, eczema, wound, bed sore
• CPC Class Codes: A61B 5/6843 Monitoring or controlling sensor contact pressure
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: A61F 13/00 Bandages or dressings radioactive dressings A61N5/1029; Absorbent pads
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/90 Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2230/00 Measuring parameters of the user

Abstract

A method and apparatus for measuring a volume of a wound are described, the method comprising the steps of: applying a dressing over a wound, the volume of which is to be measured, the dressing including at least a sealing drape over the wound so as to create a sealed wound cavity; creating a vacuum in said wound cavity by vacuum pump means so as to produce a predetermined vacuum in the wound cavity; measuring a volume of air extracted from said wound cavity in producing said predetermined vacuum; and, calculating a volume of said wound.

Claims

1. A method of measuring a volume of a wound, the method comprising:

creating a vacuum in a wound cavity so as to produce a desired level of vacuum in the wound cavity, wherein the wound cavity is created by placing a sealing drape over a wound;

measuring a volume of air extracted from said wound cavity in producing said desired level of vacuum;

measuring a leak rate and calculating a volume of said wound based at least in part on the measured volume of air and the measured leak rate, wherein calculating the volume of said wound comprises correcting the wound volume based at least in part on the measured leak rate.

2. The method according to claim 1, wherein the volume of air extracted is measured by a flow meter.

3. The method according to claim 1, wherein volumes of one or more components located in a fluid flow path for creating the vacuum in the wound cavity are measured to produce a correction factor for calculating the volume of said wound.

4. The method according to claim 1, wherein the wound volume is computed by a control module configured to execute software operations.

5. The method according to claim 1, wherein creating the vacuum in the wound cavity comprises generating the vacuum until a steady state level of vacuum in the wound cavity is achieved.

6. The method according to claim 1, wherein the wound volume is calculated at a time of sealing drape change.

7. The method according to claim 1, wherein the wound volume is calculated when a waste canister is empty.

8. The method according to claim 1, further comprising placing the sealing drape in a repeatable manner at each sealing drape change and at each wound volume calculation.

9. The method according to claim 3, wherein the correction factor is subtracted from the measured volume of air.

10. The method according to claim 1, wherein the leak rate is measured by measuring flow of air in a fluid flow path for creating the vacuum in the wound cavity after steady state level of vacuum in the wound cavity has been reached.

11. The method according to claim 10, further comprising computing, based at least in part on the leak rate, a volume of air extracted from the wound cavity due to a leak and correcting the calculated wound volume by subtracting the volume of air extracted from the wound cavity due to the leak from the measured volume of air.