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Patent Issued for Customized Patient-Specific Acetabular Orthopaedic Surgical Instrument and Method of Use and Fabrication

September 3, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Roose, Jeffrey R. (Milford, IN); Sherman, Jason T. (Warsaw, IN); Rose, Bryan (South Whitley, IN); Metzinger, Anthony (Warsaw, IN), filed on August 12, 2010, was published online on August 19, 2014.

The patent's assignee for patent number 8808302 is DePuy Synthes Products, LLC (Raynham, MA).

News editors obtained the following quote from the background information supplied by the inventors: "Joint arthroplasty is a well-known surgical procedure by which a diseased and/or damaged natural joint is replaced by a prosthetic joint. For example, in a hip arthroplasty surgical procedure, a prosthetic hip replaces a patient's natural hip. A typical prosthetic hip includes an acetabular orthopaedic prosthesis and/or femoral head orthopaedic prosthesis. A typical acetabular orthopaedic prosthesis includes an acetabular cup, which is secured to the patient's natural acetabulum, and an associated polymer/ceramic/metal bearing or ring.

"To facilitate the replacement of the natural joint with an acetabular orthopaedic prosthesis, orthopaedic surgeons may use a variety of orthopaedic surgical instruments such as, for example, reamers, drill guides, drills, and/or other surgical instruments. Typically, such orthopaedic surgical instruments are generic with respect to the patient such that the same orthopaedic surgical instrument may be used on a number of different patients during similar orthopaedic surgical procedures."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "According to one aspect of the disclosure, a customized patient-specific orthopaedic instrument for facilitating implantation of an acetabular cup prosthesis in a coxal bone of a patient is disclosed. The customized patient-specific orthopaedic instrument includes a customized patient-specific acetabular reaming guide including a ring-shaped body having an inner surface defining a cylindrical passageway, and a plurality of arms extending from the ring-shaped body. Each of the ring-shaped body and the plurality of arms includes a bone-facing surface having a customized patient-specific negative contour that receives a corresponding positive contour of the patient's coxal bone. The cylindrical passageway defines a longitudinal axis that is oriented relative to the bone-facing surface of the ring-shaped body based on a predetermined version angle and a predetermined inclination angle of the acetabular cup prosthesis when the prosthesis is implanted in the patient's coxal bone.

"In some embodiments, the customized patient-specific acetabular reaming guide may further include a guide housing configured to be secured to the ring-shaped body, and the guide housing may have a second inner surface defining a longitudinal passageway sized to receive an acetabular reamer surgical tool. Additionally, in some embodiments, the guide housing may include a depth stop to limit movement of the acetabular reamer surgical tool along the longitudinal axis. In some embodiments, the ring-shaped body may have a slot defined therein, and the guide housing may have a flange extending from a lower end thereof. The flange may be sized to be received in the slot of the ring-shaped body to secure the guide housing to the ring-shaped body.

"In some embodiments, an angle may be defined between each arm of the plurality of arms with respect to another adjacent arm of the plurality of arms when viewed in the top plan view and each of the angles may have a magnitude different from any other angle. Additionally, in some embodiments, the plurality of arms may include at least three arms extending from the ring-shaped body. In some embodiments, the customized patient-specific negative contour of the bone-facing surface of at least one of the plurality of arms may receive the corresponding positive contour of the ilium of the patient's coxal bone. In some embodiments, each arm of the plurality of arms may include a surface defining a hole extending therethrough sized to receive a bone pin.

"In some embodiments, the customized patient-specific negative contour of the bone-facing surface of the ring-shaped body may receive the corresponding positive contour of the acetabular margin of the patient's coxal bone. In some embodiments, the cylindrical passageway of the ring-shaped body may be sized to receive an acetabular reamer surgical tool.

"According to another aspect, a customized patient-specific orthopaedic instrument includes a customized patient-specific acetabular reaming guide including a guide body and a guide housing securable the guide body. The guide body includes a bone-facing surface having a customized patient-specific negative contour that receives a corresponding positive contour of the patient's coxal bone, and an inner surface defining a cylindrical passageway extending therethrough, the cylindrical passageway defining a longitudinal axis oriented relative to the bone-facing surface based on a predetermined version angle and a predetermined inclination angle of the acetabular cup prosthesis when implanted in the patient's coxal bone. The guide housing includes a depth stop to limit movement of an acetabular reamer surgical tool along the longitudinal axis.

"In some embodiments, the guide body may include a plurality of arms, and each arm of the plurality of arms may include a bone-facing surface having a customized patient-specific negative contour to receive a corresponding positive contour of the patient's coxal bone. In some embodiments, the guide body may have a slot defined therein extending orthogonally to the longitudinal axis, and the guide housing may have a flange extending from an end securable to the guide body. The flange may be sized to be received in the slot of the guide body to secure the guide housing to the guide body.

"In some embodiments, the customized patient-specific orthopaedic instrument may further include the acetabular reamer surgical tool, which may include at least one reamer head to be separately secured to a reamer shank of the acetabular reamer surgical tool. Additionally, in some embodiments, the reamer shank may include a shaft having a flange extending outwardly therefrom. The flange may be positioned to contact the depth stop when the reamer head has advanced to a predetermined positioned relative to the bone-facing surface of the guide body. In some embodiments, the flange may be a depressible button. In some embodiments, the customized patient-specific acetabular reaming guide may be formed from a transparent material.

"According to another aspect, a method of using a customized patient-specific acetabular reaming guide to perform an orthopaedic bone reaming procedure on a patient's acetabulum to facilitate implantation of an acetabular cup prosthesis in a coxal bone of the patient is disclosed. The method includes positioning a guide body of the customized patient-specific acetabular reaming guide such that a customized patient-specific negative contour defined in a bone-facing surface of the guide body receives a corresponding positive contour of the patient's coxal bone. The guide body has a cylindrical passageway that defines a longitudinal axis oriented relative to the bone-facing surface based on a predetermined version angle and a predetermined inclination angle of the acetabular cup prosthesis when implanted in the patient's coxal bone. The method also includes securing a guide housing of the customized patient-specific acetabular reaming guide to the guide body, advancing an acetabular reamer surgical tool along the longitudinal axis into the patient's acetabulum, and reaming the patient's acetabulum using the cylindrical passageway of the guide body and the guide housing as guides for the acetabular reamer surgical tool.

"In some embodiments, the method may further include coupling a reamer shank to a reamer head of the acetabular reamer surgical tool, and positioning the acetabular reamer surgical tool within the guide housing prior to securing the guide housing to the guide body. Additionally, in some embodiments, reaming the patient's acetabulum may include advancing the reamer head to a predetermined depth into the acetabulum, wherein a flange of the reamer shank contacts with an upper end of the guide housing at the predetermined depth. In some embodiments, positioning the guide body may include positioning the guide body such that the customized patient-specific negative contour of the bone-facing surface receives a corresponding positive contour of the acetabular margin of the patient's coxal bone.

"In some embodiments, the guide body may include at least one arm including a bone-facing surface having a customized patient-specific negative contour, and positioning the guide body may include positioning the at least one arm on the patient's coxal bone such that the customized patient-specific negative contour of the at least one arm receives a corresponding positive contour of the patient's coxal bone. In some embodiments, positioning the guide body may include positioning the at least one arm such that the customized patient-specific negative contour of the bone-facing surface receives the corresponding positive contour of the ilium of the patient's coxal bone. In some embodiments, the method may further include drilling a plurality of pilot holes into the patient's coxal bone using holes defined in the guide body as drill guides, and inserting a bone pin through each of the plurality of pilot holes and into each of the corresponding pilot holes formed in the patient's coxal bone."

For additional information on this patent, see: Roose, Jeffrey R.; Sherman, Jason T.; Rose, Bryan; Metzinger, Anthony. Customized Patient-Specific Acetabular Orthopaedic Surgical Instrument and Method of Use and Fabrication. U.S. Patent Number 8808302, filed August 12, 2010, and published online on August 19, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8808302.PN.&OS=PN/8808302RS=PN/8808302

Keywords for this news article include: Orthopedics, Prosthetics, Arthroplasty, Bone Research, Medical Devices, DePuy Synthes Products LLC.

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Source: Journal of Engineering


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