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An Impactor Head

IP.com Disclosure Number: IPCOM000187266D
Publication Date: 2009-Sep-02
Document File: 11 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

An impactor head for transferring an impaction force to a prosthetic component. The impactor head comprises a body, at least one hinged clip and a coupler for coupling the body to an impactor handle. The body has a first surface shaped to conform to an articulating surface of a prosthetic component. The at least one hinged clip is arranged to couple the body to a prosthetic component. The means for coupling the body to an impactor handle is such that when the body is coupled to a prosthetic component and to an impactor handle an impaction force applied to the impactor handle is transferred to the prosthetic component.

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An Impactor Head

The present invention relates to an impactor head. In particular, the present invention relates to an impactor head for coupling to a prosthetic component during implantation of a prosthesis. More particularly, the impactor head is arranged to couple to the prosthetic

component for implanting and adjusting the position of the prosthetic component and further arranged to couple to an impactor handle for transferring an impaction force to the prosthetic component.

For a prosthesis, such as a replacement knee, it is commonly necessary to apply an

impaction force to a prosthetic component in order to secure the prosthetic component in position. For instance, during knee surgery a femoral knee prosthetic component is secured to a prepared end of a femur by applying an impaction force to the prosthetic component such that the prosthetic component bears down upon a prepared end of the femur forming an interference fit. It is important that the impaction force does not damage

During knee replacement surgery, it is important that the femoral implant remains sterile. It can be difficult to accurately position the implant and in particular it can be difficult to manipulate the articulating surface of the implant without risking dropping the implant. Additionally, during the surgical procedure, it may be necessary to temporarily implant and

later extract a trial femoral component. It can be difficult to extract the trial femoral component as the outward facing portions of the trial femoral component are smooth articulating surfaces.

It is known to provide a femoral impactor that provides a mechanism for gripping a

femoral implant so that it is not touched by the surgeon, and also so that the risk of dropping the prosthesis is reduced. Once the femoral implant is in position an impaction

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the articulating surface of the implant in order to ensure correct functioning of the implanted prosthesis. It is known to provide an femoral impactor having a first portion adapted to engage the implanted femoral implant and a coupled handle. An impaction force may be applied to the handle to drive the femoral prosthetic component into its final position.

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force may be applied to the femoral impactor to secure the implant in position. Furthermore, the same femoral impactor instrument may be used to manipulate a trial femoral component. Such a femoral impactor generally comprises a first moulded portion arranged to engage part of the articulating surface of the femoral implant and an adjustable engagement mechanism, such as a pair of metallic pincers arranged to pass around the

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implant to secure the implant to the impactor.

Known femoral impactors are adjustable in order to be able to engage and retain a range of different sizes of femoral implants. However, the adjustment mechanism is...