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Assembly comprising composite materials for bearing surfaces and uses thereof in reconstructive or artificial joints

A composite material, load-bearing surface technology, used in hip joints, joint implants, joint implants, etc., can solve problems such as osteolysis, osteoporosis, joint damage, etc.

Inactive Publication Date: 2009-04-01
INVIBIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem is acknowledged that debris from polyethylene wear can cause adverse biological responses leading to osteoporosis or osteolysis with subsequent need for revision surgery
In a joint, if there is any imperfect fit between the two load-bearing parts, the joint will wear out faster than expected (due to increased load), leading to premature failure of the joint

Method used

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  • Assembly comprising composite materials for bearing surfaces and uses thereof in reconstructive or artificial joints
  • Assembly comprising composite materials for bearing surfaces and uses thereof in reconstructive or artificial joints
  • Assembly comprising composite materials for bearing surfaces and uses thereof in reconstructive or artificial joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Example 1 - General steps used to make the pin

[0094] All pins are machined from injection molded substrates. All substrates were produced using standard conditions, eg as described in general literature available from Invibio Limited. The machined pins were polished to a surface roughness (Sa) of about 1 micron. All pins were cleaned in aqueous ethanol and demineralized water and annealed using a typical annealing protocol such as that described in the general literature available from Invibio Ltd. All pins are machined so that any fiber alignment caused by the direction of polymer flow is parallel to the reciprocating motion. All pins were gamma sterilized with a radiation dose of 50 kGy unless otherwise specified.

Embodiment 2

[0095] Example 2 - General steps used to make the board

[0096] All panels are machined from injection molded substrates. All substrates were produced using standard conditions. The machined plates were ground to maintain the injection molded surface finish (Sa approximately 1 micron). All plates were cleaned in aqueous ethanol and demineralized water and annealed using the normal annealing protocol. All plates were machined so that any fiber alignment caused by the direction of polymer flow was parallel to the reciprocating motion.

Embodiment 3

[0097] Example 3 - General procedure for testing materials

[0098] Use a pin-to-plate wear tester. The machine described is a four-position pin-to-plate wear tester with reciprocating and rotational motion. The reciprocating motion is performed with a sledgehammer moving along two fixed parallel hardened steel bars and a heated bed, the lubricant plate and plate holder are placed on top of this sledgehammer. Rotary motion is used for each pin using a small motor. The cycle frequency of both the reciprocating motion and the rotating motion is set at about 1 Hz. The plate holder consists of four sleeves into which the plate coupons are clamped. The lubricant is contained in a lubricant pan and heated to a temperature of 37°C by resistors in the heated bed. Heating is controlled by thermocouples. A load (20N or 40N) is applied to each position by a lever mechanism. A lubricant level probe made of platinum wire is attached to the lubricant pan, keeping the lubricant at a ...

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Abstract

An assembly, for example for a reconstructive joint of the human body, comprises first and second parts which bear against one another. The first and second parts may both comprise a first polymeric material which is preferably polyetheretherketone in combination with carbon fibre.

Description

technical field [0001] The present invention relates to polymeric materials and in particular, although not exclusively, to the use of these materials in assemblies comprising first and second parts which support each other. Preferred embodiments relate to the use of composite materials for load-bearing surfaces, such as in reconstructed joints (or other components) of the human body. Background technique [0002] A wide range of materials have been proposed for reconstructed or artificial joints (or other components) in the human body, for example, for joints or load-bearing surfaces in the spine; for shoulder or finger joints; and for part or all of the hip or knee replacement. [0003] Tribiology International Vol.31, No.11, pp661-667, 1998 (Wang) described the success of total hip arthroplasty in the second half of the 20th century as mainly due to the use of ultra-high molecular weight polyethylene as the load-bearing surface of the hip component. Excellent wear resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/44A61F2/30
CPCC08G65/40A61F2002/30673A61F2/44A61F2/32A61L27/44C08G65/4012A61L27/443A61F2002/30649A61F2/30965C08L71/10Y10T29/49826C08L71/00A61B17/58A61B17/866A61L27/08A61L27/16C08K7/02C08L71/123A61L2430/38A61L2430/24
Inventor 约翰·尼尔·迪瓦恩
Owner INVIBIO