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Alignment Device for Positioning a Cutting Guide Block during TKR Surgery

IP.com Disclosure Number: IPCOM000236750D
Publication Date: 2014-May-14

Publishing Venue

The IP.com Prior Art Database

Abstract

An alignment device is provided for intraoperative use during total knee replacement (TKR) surgery. The surgeon may use the alignment device to facilitate the correct positioning on the proximal tibia, relative to an anatomical landmark, of a cutting guide block, which includes a slot for guiding a bone saw blade. Using the alignment device, the surgeon may orient the slot to be perpendicular, within an acceptable range of accuracy, to the longitudinal axis of the tibia, prior to final attachment of the block to the proximal tibia. Once properly positioned, the surgeon may attach the cutting guide block to the tibia, for example with a pair of bone pins, and then may remove the alignment device. The cutting guide block may be patient specific and include a preoperatively determined, bone interface surface that matches the particular bone anatomy of the patient. The following figures, labeled Concepts 1-17, show various embodiments of the alignment device and the cutting guide block, as the surgeon may position them relative to the lower leg of the patient. In these figures, the lower leg appears to be in a vertical, standing position. However, during the TKR procedure, the patient normally lies in a supine (face upward) position with the operative knee bent and propped above the table, and the lower leg inclined relative to the table.

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Page 01 of 18

Alignment Device for Positioning a Cutting Guide Block during TKR Surgery

     An alignment device is provided for intraoperative use during total knee replacement (TKR) surgery. The surgeon may use the alignment device to facilitate the correct positioning on the proximal tibia, relative to an anatomical landmark, of a cutting guide block, which includes a slot for guiding a bone saw blade. Using the alignment device, the surgeon may orient the slot to be perpendicular, within an acceptable range of accuracy, to the longitudinal axis of the tibia, prior to final attachment of the block to the proximal tibia. Once properly positioned, the surgeon may attach the cutting guide block to the tibia, for example with a pair of bone pins, and then may remove the alignment device. The cutting guide block may be patient specific and include a preoperatively determined, bone interface surface that matches the particular bone anatomy of the patient.

     The following figures, labeled Concepts 1-17, show various embodiments of the alignment device and the cutting guide block, as the surgeon may position them relative to the lower leg of the patient. In these figures, the lower leg appears to be in a vertical, standing position. However, during the TKR procedure, the patient normally lies in a supine (face upward) position with the operative knee bent and propped above the table, and the lower leg inclined relative to the table.


Page 02 of 18

Concept 1:

The alignment device includes an endplate attached to the end of a long rod, and the endplate inserts into the slot of the cutting guide block.


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Concept 2:

The alignment device includes a long rod and an end element attached to the end of the long rod, and the end element has apertures for sliding assembly onto two bone pins that attach the cutting guide block to the tibia. The block may be repositioned while the alignment device is assembled onto the bone pins by partially withdrawing one pin and pivoting the block and the device about the other pin.


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Concept 3:

The alignment device includes a long rod and an end element attached to the end of the long rod, and the end element has a pair of posts for insertion into the bone pin holes of the cutting guide block. Once the guide block is properly positioned, the surgeon may remove the alignment device and insert bone pins through the bone pin holes to attach the block to the tibia.


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Concept 4:

The alignment device includes a long rod that inserts through a bracket attached to the cutting guide block and extends to touch against the anatomical landmark (top of foot).


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Concept 5:

The alignment device includes a long rod that inserts through a bracket attached to the cutting guide block, and a straight extension rod that attaches to the long rod and rests upon an anatomical landmark (top of foot).


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Concept 6:

The alignm...