IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0049753
(2008-03-17)
|
등록번호 |
US-8328874
(2012-12-11)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
100 |
초록
▼
A mobile tibial assembly includes a tibial tray and a unicompartmental tibial insert configured to move relative to the tibial tray. The tibial insert includes a platform having an upper bearing surface and a stem extending downwardly from a bottom surface of the unicompartmental insert. The tibial
A mobile tibial assembly includes a tibial tray and a unicompartmental tibial insert configured to move relative to the tibial tray. The tibial insert includes a platform having an upper bearing surface and a stem extending downwardly from a bottom surface of the unicompartmental insert. The tibial tray includes a corresponding recess, such as a cavity and/or a channel, configured to receive the stem therein such that the stem and the recess cooperate to constrain the movement of the unicompartmental tibial insert relative to the tibial tray. The stem of the unicompartmental tibial insert is configured to extend below the bottom surface of the tibial tray when received in the cavity.
대표청구항
▼
1. A mobile tibial assembly comprising: a tibial tray configured to be coupled to a surgically-prepared surface of a proximal end of a tibia, the tibial tray including (i) a platform having a curved upper surface, the curved upper surface having a first substantially straight edge that defines an an
1. A mobile tibial assembly comprising: a tibial tray configured to be coupled to a surgically-prepared surface of a proximal end of a tibia, the tibial tray including (i) a platform having a curved upper surface, the curved upper surface having a first substantially straight edge that defines an anterior end of a generally wedge-shaped opening in the curved upper surface and a second substantially straight edge that defines a posterior end of the wedge-shaped opening, the first substantially straight edge being shorter than the second substantially straight edge such that the anterior end of the wedge-shaped opening is narrower than the posterior end of the wedge-shaped opening, (ii) an anchor extending downwardly from a bottom surface of the platform, and (iii) a cavity extending downwardly from the generally wedge-shaped opening formed in the upper surface of the platform of the tibial tray into the anchor; anda unicompartmental tibial insert including (i) a platform having an upper bearing surface and a curved bottom surface configured to contact the curved upper surface of the platform of the tibial tray and (ii) and a stem extending downwardly from the curved bottom surface of the platform of the unicompartmental tibial insert through the generally wedge-shaped opening in the upper surface of the platform of the tibial tray, the stem being received within the cavity of the tibial tray such that a bottom surface of the stem of the unicompartmental tibial insert is positioned below a bottom surface of the platform of the tibial tray. 2. The mobile tibial assembly of claim 1, wherein (i) the anchor of the tibial tray includes a medial wall, a lateral wall, an anterior wall, a posterior wall, and a bottom wall, and(ii) the medial, lateral, anterior, and posterior walls each extend downwardly from the bottom surface of the platform of the tibial tray and are each angled toward each other in a direction away from the bottom surface of the tibial tray. 3. The mobile tibial assembly of claim 1, wherein a width of the opening of the cavity of the tibial tray is greater than a width of a corresponding end of the stem of the unicompartmental tibial insert. 4. The mobile tibial assembly of claim 1, wherein a length of a first end of the cavity of the tibial tray is greater than a length of a corresponding end of the stem of the unicompartmental tibial insert. 5. The mobile tibial assembly of claim 1, wherein a longitudinal axis of the cavity of the tibial tray is parallel to an inboard surface of the platform of the tibial tray. 6. The mobile tibial assembly of claim 1, wherein a longitudinal axis of the cavity of the tibial tray is angled with respect to an inboard surface of the platform of the tibial tray. 7. The mobile tibial assembly of claim 1, wherein: (i) the stem of the unicompartmental tibial insert includes a protrusion extending from a side surface, and(ii) the tibial tray includes a recess defined in a side wall that defines the cavity, the protrusion being received in the recess. 8. The mobile tibial assembly of claim 1, wherein the stem has a generally oval-shaped cross-section. 9. The mobile tibial assembly of claim 1, wherein the stem has a generally wedge-shaped cross-section. 10. A mobile tibial assembly comprising: a tibial tray configured to be coupled to a surgically-prepared surface of a proximal end of a tibia, the tibial tray including (i) a platform having a curved top surface and a bottom surface, the curved top surface having a first substantially straight inner edge and a second substantially straight inner edge, the first substantially straight inner edge being shorter than the second substantially straight inner edge, and (ii) an anchor extending downwardly from the bottom surface of the platform, the anchor having a cavity defined therein, the cavity having a generally wedge-shaped opening defined on the curved top surface of the platform, the first substantially straight inner edge defining an anterior end of the wedge-shaped opening and the second substantially straight inner edge defining a posterior end of the wedge-shaped opening such that the anterior end of the wedge-shaped opening is narrower than the posterior end of the wedge-shaped opening; anda unicompartmental tibial insert including (i) a platform having a curved bottom surface configured to contact the curved top surface of the platform of the tibial tray and (ii) a stem extending downwardly from the platform, the stem being configured to extend through the opening defined on the curved top surface of the platform of the tibial tray and be received by the cavity of the tibial tray,wherein (i) the stem of the unicompartmental tibial insert is configured to extend below the bottom surface of the tibial tray when received in the cavity, (ii) a width of the opening of the cavity of the tibial tray is greater than a width of a corresponding end of the stem of the unicompartmental tibial insert, and (iii) a length of a first end of the cavity of the tibial tray is greater than a length of a corresponding end of the stem of the unicompartmental tibial insert. 11. The mobile tibial assembly of claim 10, wherein a longitudinal axis of the cavity of the tibial tray is parallel to an inboard surface of the platform of the tibial tray. 12. The mobile tibial assembly of claim 10, wherein a longitudinal axis of the cavity of the tibial tray is angled with respect to an inboard surface of the platform of the tibial tray.
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