Method for producing a wound dressing

• US 7,154,017 B2
• Filed: 12/03/2003
• Issued: 12/26/2006
• Est. Priority Date: 12/31/2002
• Status: Active Grant

• Current Assignee: Ossur hf
• Original Assignee: Ossur hf
• Inventors: Sigurjonsson, Gudmundur Fertram, Elefsen, Thordur M.
• Primary Examiner(s): Bennett, Henry
• Assistant Examiner(s): BRANDT, ADAM CURTIS
• Application Number:
  US10/725,591
• Publication Number:
  US 20040127833A1
• Time in Patent Office: 1,119 Days
• Field of Search: 602/41, 602/42, 602/43, 602/45, 602/58
• US Class Current: 602/41
• CPC Class Codes: A61F 13/0203 with fluid retention members
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0223 characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution
• CPC Class Codes: A61F 13/0246 characterised by the skin-adhering layer
• CPC Class Codes: A61F 13/0276 Apparatus or processes for manufacturing adhesive dressings or bandages
• CPC Class Codes: A61F 2013/00578 conformable; soft or flexible, e.g. elastomeric
• CPC Class Codes: A61F 2013/00587 Thickness
• CPC Class Codes: A61F 2013/00604 Multilayer
• CPC Class Codes: A61F 2013/00748 with hydrocolloids or superabsorbers wound bandages with alginate A61F2013/00229; plasters with cyano-acrylic adhesive A61F2013/00459; plasters for treating burn with hydrogel A61F2013/00523; adhesive for plasters, with hydrogel A61F2013/00676; water-based A61F2013/00689; for use on mucosae A61F2013/00714; for use on wounds A61F2013/00719; with absorbent adhesives A61F2013/00757; with fumed silica A61F2013/00787; with viscoelastic oil-elastomer gel A61F2013/00893
• CPC Class Codes: A61F 2013/00804 different adhesion of different adhesive layers plasters with a double adhesive layer A61F2013/00421; with cyano-acrylic adhesive A61F2013/00459; with adhesive connecting means A61F2013/00561; adhesives for plasters A61F2013/00655; with absorbent adhesives A61F2013/00757; with permeable adhesive layers A61F2013/00761; changing the adhesion force with strain value A61F2013/00838
• CPC Class Codes: A61F 2013/00846 with transparent or translucent part
• CPC Class Codes: A61F 2013/00885 impervious, i.e. occlusive bandage
• CPC Class Codes: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/34 Oils, fats, waxes or natural resins A61L15/225 takes precedence
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

A method for making a wound dressing having an absorbent core includes the steps of inserting a plurality of projection elements into a distal surface of the absorbent core such that the projection elements extend into a thickness of the absorbent core and are suitably heated to impart their shape in the absorbent core. The projection elements are removed from the absorbent core to form receptacles therein. A discrete portion of at least one absorbent material is inserted in each of the receptacles.

Claims

1. A method for making a wound dressing having an absorbent core, the method comprising the steps of:

inserting a plurality of projection elements into a distal surface of the absorbent core, said projection elements extending into the absorbent core a distance into a thickness thereof and being suitably heated to impart their shape in the absorbent core;

removing said projection elements from said absorbent core to form receptacles therein; and

inserting a discrete portion of at least one absorbent material into each of said receptacles.

2. The method according to claim 1, wherein said projection elements are arranged in a random pattern.

3. The method according to claim 1, wherein said projection elements are arranged in a preselected pattern such that the receptacles are generally equally spaced from one another.

4. The method according to claim 1, wherein the absorbent material is deposited into each of the receptacles in a predetermined amount depending on the location of the respective receptacle relative to the central portion of the absorbent core.

5. The method according to claim 1, further comprising the step of compacting the absorbent material in the receptacles by said projection elements.

6. The method according to claim 1, further comprising the step of connecting a liquid impervious, vapor permeable backing layer to the absorbent core that extends over at least the distal surface of the absorbent core.

7. The method according to claim 1, wherein the absorbent core is a hydrophilic polymeric foam.

8. A method for forming a plurality of receptacles in an absorbent core of a wound dressing, the method comprising the steps of:

inserting a plurality of projection elements into a distal surface of the absorbent core, said projection elements extending into a thickness of the absorbent core;

removing said projection elements from said absorbent core to form receptacles therein;

inserting a plurality of discrete portions of at least one absorbent material into each of said receptacles.

9. The method according to claim 8, wherein the absorbent core is a hydrophilic polymeric foam.

10. A method for forming a plurality of receptacles in an absorbent core of a wound dressing, the method comprising the steps of:

placing a plurality of projection elements transversely along a distal surface of the absorbent core, said projection elements extending into a distance short of an entire thickness of the absorbent core and being suitably heated to impart their shape in the absorbent core;

removing said projection elements from said absorbent core to form a plurality of transverse channels defining receptacles disposed along the distal surface of the absorbent core;

inserting a plurality of discrete portions of at least one absorbent material into each of said receptacles.