Method of making a tack-free gel

• US 8,703,034 B2
• Filed: 08/23/2011
• Issued: 04/22/2014
• Est. Priority Date: 08/14/2001
• Status: Expired due to Fees

• Current Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Original Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Inventors: Ahlberg, Russell E., Adlparvar, Payam, Taylor, Scott V., Wixey, Matthew A., Martinez, Daniel, Brustad, John R.
• Primary Examiner(s): Lee, Edmund H.
• Application Number:
  US13/215,432
• Publication Number:
  US 20110316190A1
• Time in Patent Office: 973 Days
• Field of Search: None
• US Class Current: 264/263
• CPC Class Codes: A61B 17/3423 Access ports, e.g. toroid shape introducers for instruments or hands access sites for liquids A61M39/0247
• CPC Class Codes: A61B 17/3462 with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals expandable cannulas A61B17/3417
• CPC Class Codes: A61B 17/3498 Valves therefor, e.g. flapper valves, slide valves haemostasis valves A61M39/06; check valves A61M39/24
• CPC Class Codes: A61B 2017/00469 for insertion of instruments, e.g. guide wire, optical fibre
• CPC Class Codes: A61B 2017/22067 Blocking; Occlusion A61B2017/22054 takes precedence
• CPC Class Codes: A61M 3/0279 Cannula; Nozzles; Tips; their connection means
• CPC Class Codes: B29C 37/0067 Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other separating agents B29C33/60
• CPC Class Codes: B29C 39/006 Monomers or prepolymers by reaction injection moulding B29C67/246
• CPC Class Codes: B29C 39/025 for making multilayered articles
• CPC Class Codes: B29C 39/123 Making multilayered articles

Abstract

A process of making a tack-free gel is disclosed comprising the steps of providing a mold defining a mold cavity, the mold cavity comprising a plastic material; pouring or injecting a molten gel having a high molding temperature into the mold cavity; and forming the tack-free gel as a thin layer of plastic of the mold cavity is melted over the gel. The forming step further comprises cooling the gel from the molten state to a solidified state. The melting temperature of the plastic material is lower than the molding temperature of the gel; and the higher the temperature differential, the greater the melting of the plastic material and the thicker the layer of the plastic material on the surface of the gel. The mold may be formed of low-density polyethylene (LDPE).

Claims

1. A method of making a tack-free gel, comprising the steps of:

providing a mold defining a mold cavity, the mold cavity comprising a plastic material;

pouring or injecting a molten gel being at a molding temperature into the mold cavity; and

melting a layer of the plastic material of the mold cavity onto the molten gel by permitting the molten gel to contact the mold cavity;

wherein the mold comprises a mold base comprising;

a plurality of mold holes forming a plurality of mold cavities, each of the mold holes comprising;

an axial pin to mold an axial hole through the gel;

a low-density polyethylene (LDPE) cylinder in each mold cavity providing a predetermined inside diameter for the mold; and

an LDPE disc mounted on the axial pin and disposed at the bottom of each mold cavity in the mold base.

2. The method of claim 1 wherein the plastic material has a melting temperature that is lower than the molding temperature of the molten gel and the melting temperature of the plastic material differs from the molding temperature of the molten gel by about 20°

F. to about 100°

F.

3. The method of claim 1 further comprising increasing thickness of the melted layer of plastic material by selecting a plastic material that has a melting temperature lower than the molding temperature of the molten gel and increasing the temperature differential between the melting temperature of the plastic material and the molding temperature of the molten gel.

4. The method of claim 1 further comprising heating gel to liquefy the gel to form a molten gel.

5. The method of claim 4 wherein the molding temperature is about 450°

F.

6. The method of claim 1 further comprising replacing each LPDE cylinder after each molding process.

7. The method of claim 1 wherein the mold further comprises a mold top disposed axially of the mold base and comprising:

a plurality of mold holes forming a plurality of cavities, each of the mold top holes is adapted to receive each LDPE cylinder; and

a second LDPE disc disposed at the top of each mold cavity of the mold top.

8. The method of claim 1 further comprises cooling the molten gel to form a solidified gel.

9. The method of claim 8 further comprising dabbing the solidified gel in a low-friction powder.

10. The method of claim 8 forming an opening in the solidified gel.

11. The method of claim 10 applying a low-friction material to the opening in the solidified gel and wherein the solidified gel and the low-friction material have an elongation up to about 1500 percent.

12. The method of claim 8 applying a low-friction material to the solidified gel.

13. The method of claim 12 wherein the low-friction material is formed by a fluoropolymer including polytetrafluoroethylene (PTFE) and the plastic material is formed from at least one of PVC, ABS, acrylic, polycarbonate, clear polycarbonate, Delrin, acetal, polypropylene and high-density polyethylene (HDPE).

14. The method of claim 12 wherein the low-friction material is in the form of tape and further comprising applying a lubricious material to the solidified gel after applying the low-friction material.

15. The method of claim 8 further comprising tumbling the solidified gel in a lubricious material.

16. The method of claim 8 further comprising applying a lubricious material to the solidified gel by vacuum deposition.