Apparatus for topical negative pressure therapy

• US 8,617,129 B2
• Filed: 11/11/2008
• Issued: 12/31/2013
• 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): HAND, MELANIE JO
• Application Number:
  US12/746,499
• Publication Number:
  US 20100280422A1
• Time in Patent Office: 1,876 Days
• Field of Search: 604/304, 604/313, 604/319, 604/540
• US Class Current: 604/313
• CPC Class Codes: A61M 1/00 Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems catheters A61M25/00; tube connectors, tube couplings, valves or branch units specially adapted for medical use A61M39/00; devices for taking samples of blood A61B5/15; filters implantable into blood vessels A61F2/01
• CPC Class Codes: A61M 1/71 Suction drainage systems containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: A61M 1/96 Suction control thereof
• CPC Class Codes: A61M 1/966 having a pressure sensor on or near the dressing
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 1/984 portable on the body
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 27/00 Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202
• CPC Class Codes: A61M 31/00 Devices for introducing or retaining media, e.g. remedies, in cavities of the body A61M25/00 takes precedence ; introducing or retaining ophthalmic products into the ocular cavities A61F9/0008
• CPC Class Codes: A61M 39/00 Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use for respiratory devices, e.g. tracheal tubes A61M16/00; artificial heart valves A61F2/24

Abstract

Apparatus and a method for the provision of topical negative pressure therapy to a wound site are described, the apparatus comprising: vacuum generating means for generating a negative pressure at said wound site said vacuum generating means being operably connected to a dressing at said wound site by aspiration conduit means; pressure sensing conduit means in fluid communication with said aspiration conduit means at a junction adjacent said dressing; first pressure sensing means between said junction and said vacuum generating means; second pressure sensing means operably associated with said pressure sensing conduit means; diagnostic means in communication with said first and second pressure sensing means; and control means in communication with said diagnostic means for controlling pressure in said aspiration and said pressure sensing conduit means.

Claims

1. Apparatus for the provision of topical negative pressure therapy to a wound site, the apparatus comprising:

vacuum generating means being operably connected to a dressing at said wound site by aspiration conduit means;

pressure sensing conduit means in fluid communication with said aspiration conduit means at a junction adjacent said dressing;

first pressure sensing means between said junction and said vacuum generating means;

second pressure sensing means operably associated with said pressure sensing conduit means;

a valve associated with said pressure sensing conduit means;

diagnostic means in communication with said first and second pressure sensing means; and

control means in communication with said diagnostic means for controlling pressure in said aspiration and said pressure sensing conduit means,

wherein the control means is configured to;

detect a blockage in the aspiration conduit means based on comparison of a pressure difference between pressure sensed by the first pressure sensing means and pressure sensed by the second pressure sensing means with a pressure difference threshold;

open the valve in response to detecting the blockage;

close the valve if the pressure difference falls to substantially zero after expiration of a first time interval; and

activate a blockage alarm if the pressure difference does not fall to substantially zero after expiration of a second time interval, the blockage alarm configured to indicate the blockage in the aspiration conduit means.

2. The apparatus according to claim 1, wherein said valve enables said pressure sensing conduit to be opened to atmosphere under controlled conditions.

3. The apparatus according to claim 1, wherein said second pressure sensing means is situated between said junction and said valve.

4. The apparatus according to claim 1, wherein said first pressure sensing means is situated between said vacuum generating means and said junction.

5. The apparatus according to claim 1, wherein said junction is situated adjacent a dressing over said wound site.

6. The apparatus according to claim 1, wherein said junction is situated within a dressing over said wound site.

7. The apparatus according to claim 6, wherein said aspiration conduit means and said pressure sensing conduit means are connected to a portion of a drain/aspirant conduit having dual-lumens exiting said dressing.

13. The apparatus according to claim 1, wherein the junction comprises one of a T-piece or Y-piece.

8. Apparatus for the provision of topical negative pressure therapy to a wound site, the apparatus comprising:

a wound dressing configured to cover and seal the wound site;

an aspiration lumen;

a pressure sensing lumen;

a negative pressure source configured to provide negative pressure to the wound dressing via the aspiration lumen;

a junction positioned adjacent to the wound dressing, the junction configured to fluidically connect the aspiration lumen and the pressure sensing lumen;

a first pressure sensor positioned along the aspiration lumen between the junction and the negative pressure source;

a second pressure sensor positioned along the pressure sensing lumen;

a valve in fluid communication with the pressure sensing lumen; and

a controller configured to, based on signals received from the first and second pressure sensors, perform at least one of;

detect a blockage in the aspiration lumen, clear the blockage in the aspiration lumen, and detect a leakage in a fluid flow path, wherein the fluid flow path comprises the wound dressing, the negative pressure source, the aspiration lumen, and the pressure sensing lumen,

wherein the controller is further configured to;

detect the blockage in the aspiration lumen based on comparison of a pressure difference between pressure sensed by the first pressure sensor and pressure sensed by the second pressure sensor with a pressure difference threshold;

open the valve in response to detecting the blockage;

close the valve if the pressure difference falls to substantially zero after expiration of a first time interval; and

activate a blockage alarm if the pressure difference does not fall to substantially zero after expiration of a second time interval, the blockage alarm configured to indicate a blockage in the fluid flow path.

9. The apparatus according to claim 8, further comprising a leakage alarm configured to indicate a leakage in the fluid flow path, wherein the controller is configured to activate the leakage alarm in response to determining that the pressure difference satisfies a leakage threshold.

10. The apparatus according to claim 9, wherein the leakage threshold is substantially zero.

11. The apparatus according to claim 8, wherein the controller is further configured to open the valve in response to determining that the pressure difference satisfies the first pressure difference threshold, wherein opening the valve allows a flow of air into the pressure sensing lumen.

12. The apparatus according to claim 11, wherein the valve is configured to clear a blockage in the aspiration lumen when the valve has been opened.

14. The apparatus according to claim 8, wherein the junction comprises one of a T-piece or Y-piece.