Blow-moulding of ostomy bags

• US 10,105,254 B2
• Filed: 10/22/2013
• Issued: 10/23/2018
• Est. Priority Date: 10/23/2012
• Status: Active Grant

• Current Assignee: Coloplast A/S
• Original Assignee: Coloplast A/S
• Inventors: Oeelund, Jakob
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): Townsend, Guy K
• Application Number:
  US14/437,504
• Publication Number:
  US 20150265454A1
• Time in Patent Office: 1,827 Days
• CPC Class Codes: A61F 5/44 Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aidsabsorbent pads, e.g. sanitary towels, A61F13/15; drainage appliances for wounds A61M27/00; emptying devices for urine bags B65B69/0016; Colostomy devices adhesives for colostomy devices A61L24/00; materials for colostomy devices A61L28/00
• CPC Class Codes: A61F 5/4404 Details or parts
• CPC Class Codes: A61F 5/443 having adhesive seals for securing to the body, e.g. of hydrocolloid type, e.g. gels, starches, karaya gums adhesives or sealing pads therefor A61L24/00
• CPC Class Codes: B29C 2049/023 using inherent heat of the preform, i.e. 1 step blow moulding
• CPC Class Codes: B29C 2049/2017 outside the article
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 45/0055 Shaping
• CPC Class Codes: B29C 45/1684 Injecting parison-like articles B29C45/1625, B29C45/1643 and B29C45/1646 take precedence
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/20 of articles having inserts or reinforcements ; Handling of inserts or reinforcements
• CPC Class Codes: B29C 49/24 Lining or labelling
• CPC Class Codes: B29L 2031/7148 Blood bags, medical bags

Abstract

An ostomy collecting bag is provided. The collecting bag has a continuous wall with a curvature instead of sealed edges. The collecting bag is truly three-dimensional. The collecting bag may be obtained by injection blow-moulding or extrusion blow-moulding. Methods of producing an ostomy collecting bags by either injection blow-moulding or extrusion blow-moulding is also provided. In injection blow-moulding, a pre-form is injection moulded and subsequently the pre-form is blow-moulded into an ostomy collecting bag. In extrusion blow-moulding, a tube is extruded and subsequently blow-moulded into an ostomy collecting bag. The ostomy collecting bag can thus be made without seals at the edges, which provides a more flexible collecting bag with a larger interior volume.

Claims

1. A method of producing an ostomy collecting bag, the method comprising:

a). moulding a polymer to form a pre-form having an initial internal volume;

b). inserting the pre-form into a mould of a blow-moulding machine;

c). blow-moulding the pre-form to expand the initial internal volume of the pre-form and forming the ostomy collecting bag having a transition from a front wall to a rear wall of the ostomy collecting bag that is continuously smooth with no sealed edges; and

d). providing the rear wall with a first net structure and providing the front wall with a second net structure, where the first net structure has a more open structure than the second net structure.

2. The method according to claim 1, further including inserting a filter into the mould.

3. The method according to claim 1, wherein an internal surface of the mould of the blow-moulding mould is provided with a ribbed structure.

4. The method according to claim 1, further including inserting an ostomy base plate attachment ring into the mould.

5. The method according to claim 1, wherein a cover layer is inlayed in the mould prior to blow-moulding the pre-form.

6. The method according to claim 1, wherein the pre-form is moulded in a two-component moulding so that one part of the pre-form is provided by a first material and a second part is provided of a second material different from the first material.

7. The method according to claim 1, comprising moulding the polymer to form an endless tube pre-form.

8. The method according to claim 1, comprising forming the ostomy collecting bag having a curvature in a longitudinal direction such that the transition from the front wall to the rear wall of the ostomy collecting bag locates a bottom-most portion of the ostomy collecting bag closer to the rear wall than to the front wall.