Modular instrument for positioning acetabular prosthetic socket
First Claim
1. A modular instrument for correct positioning of an acetabular prosthetic socket comprising;
- a hemispherical ball member having a threaded pit in the center of its'"'"'s flat surface;
an alignment shaft having a threaded proximal end;
an orientation pillar incorporated with a levelling apparatus fixed at it'"'"'s top end, and a laser pen apparatus coupled at an intermediate location in the orientation pillar.
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Accused Products
Abstract
A modular implantation instrument for reliably positioning an acetabular prosthetic socket in the acetabulum of a pelvic bone during a total hip joint replacement surgery. The modular instrument has an interchangeable hemispherical ball member to properly engage into an acetabular prosthetic socket. A drive mechanism includes an alignment shaft member, operatively connected through an orientation pillar member to a levelling apparatus and to a laser pen apparatus. The modular instrument includes the hemipherical ball member is threadingly connected into the proximal end of said alignment shaft, the distal end of alignment shaft includes a handle and a knob. The lower end of said orientation pillar member is permanently attached to the shank of the alignment shaft member at angle of 135 degrees to the horizontal axis of said alignment shaft. The orientation pillar member includes a levelling apparatus attached to its upper end, and a laser pen apparatus attached at an intermediate location in the orientation pillar. The levelling apparatus and the laser pen apparatus are independantly adjustable parameters. Also disclosed is a detachably implantable level bit member into the levelling apparatus and a detachably implantable laser pen member into the laser pen apparatus, in order to position the acetabular prosthetic socket into correct abduction angle and antiversion angle respectively to prevent complications associated with malpositioning of an acetabular prosthetic socket.
187 Citations
20 Claims
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1. A modular instrument for correct positioning of an acetabular prosthetic socket comprising;
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a hemispherical ball member having a threaded pit in the center of its'"'"'s flat surface;
an alignment shaft having a threaded proximal end;
an orientation pillar incorporated with a levelling apparatus fixed at it'"'"'s top end, and a laser pen apparatus coupled at an intermediate location in the orientation pillar. - View Dependent Claims (2, 3, 4, 5, 6, 17, 18, 19, 20)
adjustments in hemispherical ball member causes corresponding adjustments in the alignment shaft; and
vice versa;
adjustments in the alignment shaft member causes corresponding adjustments in the orientation pillar member, adjustments in the orientation pillar member causes corresponding adjustments in the levelling apparatus and laser pen apparatus and vice versa.
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- 7. A modular instrument as defined in 1, includes an orientation pillar member consisting of a lower end, an intermediate part and an upper end.
Specification