Apparatus and method for forming a custom cement-on-cement articulating hip spacer
AssigneeCedars-Sinai Medical Center
InventorsEytan M. Debbi, Guy D. Paiement
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Abstract
Aspects of the present disclosure include a device for forming a custom cement cast of an acetabular implant for a patient. The device includes an elongated handle, and a head coupled to a proximal end of the elongated handle. The head includes a body, a circumferential lip, and a nipple. The body of the head is shaped as a spherical cap, and includes a circular base and an apex. The circumferential lip extends radially outwardly from the circular base of the body. The nipple extends from the apex of the body in a direction perpendicular to the circular base.
Claims32
A device for forming a custom cement cast of an acetabular implant for a patient, the device comprising:
- an elongated handle;
- and
- a head coupled to a proximal end of the elongated handle, the head comprising:
- a body having an exterior surface which is shaped as a uniformly spherical cap which is devoid of holes, the body including a circular base and an apex;
- a circumferential lip extending radially outwardly from the circular base of the body;
- and
- a nipple extending from the apex of the body in a direction perpendicular to the circular base;
- wherein the head is configured to release from hardened bone cement.
A method for treating an infected total hip arthroplasty in a patient, the method comprising:
- removing an implant associated with the infected total hip arthroplasty in the patient;
- placing a cement in an acetabulum of the patient;
- pressing a device into the cement, thereby forming a concave cement acetabular cast, wherein the device comprises:
- an elongated handle;
- and
- a head coupled to a proximal end of the elongated handle, the head comprising a body shaped as a spherical cap, a circumferential lip extending radially outwardly from a base of the body, and a nipple extending from an apex of the body in a direction perpendicular to the base, wherein the nipple of the head is a center of rotation of the device whereby the head is coaxially rotatable around the nipple while the cement hardens without disrupting the cement;
- advancing the device toward an acetabular bone of the patient until the nipple of the head touches the acetabular bone, thereby ensuring an appropriate thickness of the cement acetabular cast.
A method for treating an infected total hip arthroplasty in a patient, the method comprising:
- removing an implant associated with the infected total hip arthroplasty in the patient;
- placing a cement in an acetabulum of the patient;
- selecting a device comprising:
- an elongated handle;
- and
- a head coupled to an end of the elongated handle, the head comprising a body having an exterior surface which is shaped as a spherical cap and a circumferential lip extending radially outwardly from a base of the body, wherein the head is configured to release from hardened bone cement;
- pressing the device head into the cement;
- allowing the cement to harden;
- and
- removing the device head from the hardened cement, thereby forming a cement cast comprising a cement concave acetabular articulation surface.
A device for forming a custom cement cast of an acetabular implant for a patient, the device comprising:
- an elongated handle;
- and
- a head removably coupled to an end of the elongated handle, the head comprising:
- a body having an exterior surface which is shaped as a spherical cap which is devoid of openings, the body including a circular base and an apex;
- a circumferential lip extending radially outwardly from the circular base of the body;
- and
- wherein the head is configured to release from hardened bone cement and wherein the device is configured such that in use, the head is pressed into cement in a patient acetabulum such that the cement contacts the head, the cement is allowed to harden, and the device is removed from the hardened cement to create an acetabular cement cast having a cement articulation surface shaped by the head.
Dependencies are inferred from the claim text.