Trocar cannula assembly and method of manufacture

• US 8,888,692 B1
• Filed: 08/17/2012
• Issued: 11/18/2014
• Est. Priority Date: 08/26/2011
• Status: Active Grant

• Current Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Original Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Inventors: Pravongviengkham, Kennii, Dang, Kevin K., Pravong, Boun, Bolanos, Eduardo, Velasco, Joel B., Becerra, Matthew M, Sarmiento, Reynaldo C.
• Primary Examiner(s): Hoffman, Mary
• Assistant Examiner(s): CARTER, TARA ROSE E
• Application Number:
  US13/588,929
• Time in Patent Office: 823 Days
• Field of Search: 600185-199
• US Class Current: 600/207
• CPC Class Codes: A61B 17/0218 for minimally invasive surgery A61B17/0281, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/0225 flexible, e.g. fabrics, meshes, or membranes
• CPC Class Codes: A61B 2017/3486 Balloon
• CPC Class Codes: A61B 2017/3492 against the outside of the body
• CPC Class Codes: B29C 49/08 Biaxial stretching during blow-moulding
• CPC Class Codes: B29D 23/00 Producing tubular articles B29D24/00 takes precedence
• CPC Class Codes: B29K 2023/00 Use of polyalkenes or derivatives thereof as moulding material
• CPC Class Codes: B29K 2105/02 heat shrinkable B29K2995/0049 takes precedence
• CPC Class Codes: B29L 2023/00 Tubular articles B29L2024/00 takes precedence ; catheters B29L2031/7542
• CPC Class Codes: B29L 2031/7548 Cannulas
• CPC Class Codes: Y10T 156/1049 Folding only

Abstract

A cannula assembly having a retention member and a method of manufacture of the cannula assembly is provided. The cannula assembly includes a cannula and a sleeve disposed around the cannula from a proximal end to a distal end. The sleeve can be pre-formed by a stretch blow molding process then advanced over the cannula. The sleeve includes an inflatable balloon and an annular ring distal the inflatable balloon. The cannula includes an annular recess. The annular ring is sized to have an interference fit with the annular recess.

Claims

1. A cannula assembly comprising:

a cannula having a proximal end, a distal end opposite the proximal end, and a lumen extending from the proximal end to the distal end along a longitudinal axis, the lumen configured to receive a surgical instrument therein, the cannula comprising;

a generally tubular cannula body extending from adjacent the proximal end to the distal end of the cannula, the cannula body having an exterior surface and a first outer diameter;

an annular groove formed in the exterior surface of the cannula body adjacent the distal end of the cannula, the annular groove transverse to the longitudinal axis, the annular groove having a second outer diameter smaller than the first outer diameter of the cannula body; and

a sleeve having a proximal end and a distal end, the sleeve disposed around the cannula from adjacent the proximal end to the annular groove, the sleeve formed in a monolithic, unitary construction comprising;

a coupler at the proximal end sized and configured to engage the cannula;

an elongate tubular body extending distally from the coupler, the elongate tubular body having a first thickness;

a balloon positioned distal the elongate tubular body, the balloon having a second thickness smaller than the first thickness; and

an annular ring distal the balloon, the annular ring positioned in the annular groove of the cannula, the annular ring having a third thickness and a third inner diameter in an undisturbed state, the third thickness larger than the first thickness of the elongate tubular body, the third inner diameter of the annular ring in an undisturbed state smaller than the second outer diameter of the annular groove to define an interference fit between the sleeve and the cannula.

2. The cannula assembly of claim 1, wherein the first thickness of the elongate tubular body is between approximately 0.008 inches and 0.012 inches.

3. The cannula assembly of claim 1, wherein the second thickness of the balloon is between approximately 0.0005 inches and 0.002 inches.

4. The cannula assembly of claim 1, wherein the coupler of the sleeve is adhesively bonded to the cannula and the annular ring of the sleeve is adhesively bonded to the annular groove.

5. The cannula assembly of claim 4, further comprising at least one of a cyanoacrylate adhesive and an ultraviolet curing bonding adhesive adhesively bonding the coupler to the cannula and the annular ring to the annular groove.

6. The cannula assembly of claim 1, wherein the balloon has an inflated configuration with a generally toroidal shape.

7. The cannula assembly of claim 1, wherein the distal end of the sleeve is flush with the exterior surface of the cannula body.

8. The cannula assembly of claim 1, wherein the balloon has an insertion configuration in which the balloon comprises a first distal fold and a second proximal fold.