Cement restrictor including shape memory material

• US 5,997,580 A
• Filed: 05/06/1997
• Issued: 12/07/1999
• Est. Priority Date: 03/27/1997
• Status: Expired due to Fees

• Current Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Original Assignee: Johnson and Johnson Professional Inc (Johnson & Johnson)
• Inventors: Mastrorio, Brooke W., Ostiguy, Pierre S.
• Primary Examiner(s): Milano, Michael J.
• Assistant Examiner(s): Nguyen, Tram A.
• Application Number:
  US08/852,004
• Time in Patent Office: 945 Days
• Field of Search: 623/16, 623/18, 623/23, 606/62, 606/63, 606/92, 606/95, 606/99
• US Class Current: 623/23.48
• CPC Class Codes: A61F 2/30723 Plugs or restrictors for sealing a cement-receiving space tools for inserting plugs A61F2/4614; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/3676 Distal or diaphyseal parts of shafts
• CPC Class Codes: A61F 2/4614 of plugs for sealing a cement-receiving space
• CPC Class Codes: A61F 2002/30039 differing in shape-memory transition temperatures, e.g. in martensitic transition temperature or in austenitic transition temperature
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30224 cylindrical
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30289 helically-coiled
• CPC Class Codes: A61F 2002/30291 spirally-coiled, i.e. having a 2D spiral cross-section
• CPC Class Codes: A61F 2002/30327 differing in diameter
• CPC Class Codes: A61F 2002/30329 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30571 Leaf springs
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/30795 Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30797 internally-threaded
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30884 : Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/3096 : trimmed or cut to a customised size
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4631 : the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2210/0019 : operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2210/0023 : operated at different temperatures whilst inside or touching the human body, heated or cooled by external energy source or cold supply
• CPC Class Codes: A61F 2210/0033 : electrically, e.g. heated by resistor
• CPC Class Codes: A61F 2210/0038 : electromagnetically
• CPC Class Codes: A61F 2210/0042 : using a fluid, e.g. circulating
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0091 : helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2250/0039 : differing in diameter
• CPC Class Codes: A61F 2250/0042 : differing in shape-memory transition temperatures, e.g. in martensitic transition temperature, in austenitic transition temperature
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61M 25/10 : Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00

Abstract

A cement restrictor is provided for creating a fixed obstruction within a bone. An exemplary cement restrictor includes a member or body that is expandable or transitionable from a first diameter to a second diameter.

Claims

1. A cement restrictor for creating a cement restriction within a bone, said cement restrictor comprising:

a fluid impermeable configurable structure having a first configuration that has a first diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,

said structure for being inserted into an opening of said bone in said first configuration

wherein the structure in the second configuration frictionally engages said bone opening to form a fluid impermeable barrier within said bone opening, and

wherein the configurable structure includes shape memory material for transitioning the configurable structure to the second configuration.

2. The cement restrictor of claim 1, wherein the shape memory material is in the form of a sheet that is folded in the first configuration and at least partially unfolded in the second configuration.

3. The cement restrictor of claim 1, wherein in the first configuration the sheet of shape memory material is substantially conical and has a length along a longitudinal axis and a diameter extending radially from the longitudinal axis, and wherein in the second configuration the length is reduced and the diameter is increased.

4. The cement restrictor of claim 1, wherein the configurable structure includes a barbed periphery.

5. The cement restrictor of claim 1, wherein the configurable structure has a first end along a longitudinal axis and a second end opposite the first end, and wherein stressing the configurable structure causes the second end to have a greater diameter than the first end.

6. A cement restrictor for creating a cement restriction within a bone, said cement restrictor comprising:

a fluid impermeable configurable structure including shape memory material, the configurable structure having a first configuration that has a first diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,

said structure for being inserted into an opening of said bone in said first configuration,

wherein the structure in the second configuration frictionally engages said bone opening to form a fluid impermeable barrier within said bone opening, and

wherein the configurable structure has a first end along a longitudinal axis and a second end opposite the first end, and wherein heating the shape memory material causes the second end to have a greater diameter than the first end.

7. A cement restrictor for creating a cement restriction within a bone, said cement restrictor comprising:

a fluid impermeable configurable structure including shape memory material, the configurable structure having a first configuration that has a first diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,

said structure for being inserted into an opening of said bone in said first configuration,

wherein the structure in the second configuration frictionally engages said bone opening to form a fluid impermeable barrier within said bone opening, and

wherein the configurable structure has a first end along a longitudinal axis and a second end opposite the first end, and wherein cooling the shape memory material causes the second end to have a greater diameter than the first end.