Smartwound diagnostic dressing

Early, in-situ detection of wound infection

We have developed prototype hydrogel wound dressings which respond to the cytotoxins secreted by bacteria in wounds as the wound becomes critically colonised with pathogenic bacteria. The dressing (like the SPaCE sensor) responds to the four primary wound microbes:


  • Staphylococcus aureus
  • Pseudomonas aeruginosa
  • Candida species
  • Enterococcus faecalis

Wound infection

Following injury, bacteria start to colonise a wound within seconds. Most small wounds heal without infection, but some wounds become infected. The problem is there is no clincially accepted definition of wound infection. Looking at the schematic (right), illustrates the change in bacterial density in a wound which is healing (blue line) or infected (red). Note that the initial trajectory of the infected / non-infected wounds are the same. The divergence point is the Critical Colonisation Threshold (CCT).

Detecting the CCT

We believe the CCT is the earliest point in the wound healing / infection continuum at which wound infection can be detected. Our infection sensor contains phospholipid vesicles (left) dispersed in a gel matrix which are lysed by bacterial toxins secrted at the CCT. The vesicles contain a high concentration, non-toxic dye, carboxyfluorescein, which becomes fluorescent on dilution outside of the vesicle in the hydrogel matrix.

The Smartwound dressing

The dressing

An array of vesicle patches in a gel matrix. Comfortable to wear. Dressing and components are non-toxic and safe.

Initial research

The dressing research programme began in 2010 with funding from the European Commission, subsequently the EPSRC and Medical Research Council.

Development

The team consisting of scientists at the University of Bath and clincians at Bristol Children's Hospital and the QVH Hospital, East Grinstead has published over a dozen peer reviewed papers about the underpinning science.

Paediatric burns

The dressing should be effective for most acute and chronic wounds but our initial patient focus is children with small scald burns. 40,000 children in England & Wales ae burned severely enough to need hospital attention each year.

South West Children's Burns Centre

We have trialled the dressing on patients from the BRCH, Southmead hospital (Bristol), QVH (East Grinstead) and the Chelsea & Westminster hospital (London) in an ex-vivo clincial study: EVIDEnT.

Early warning prevents scarring, overuse of antibiotics and sepsis

We believe early warning of wound infection will lead to more effective, targetted treatment of patients with wounds and burns, resulting in less antibiotic prescription, reduced hopsital stay and fewer complications such as sepsis.