Otto Block 3R46 Manual Del Usuario página 8

The 743Y28 Special Levelling Device, offered by Otto Bock, allows the knee to be properly se-
cured in the 743A3 Otto Bock Alignment Apparatus, (see Technical Information 2.2.3).
4 Instructions for Attaching the Lamination Anchor
4.1 Flexion Stop
The lamination anchor serves as a flexion stop when it contacts the plastic damper protection
piece (20) (fig. 2). This function must be kept in mind during the lamination process.
4.2 Before Trial Walking
Prepare the correctly fitted lamination anchor prior to bonding it to the socket. To do this, fill
the opening of the lamination anchor with 636K6 Plastiliin Clay (fig. 3). Clamp the socket and
®
joint in the alignment apparatus. Mix 617H21 Orthocryl Sealing Resin and 617Z8
Microballoons and bond the lamination anchor to the distal end of the socket. Secure with
adhesive tape before trial walking takes place.
4.3 Final Lamination of the Socket
Following trial walking, attach the lamination anchor to the socket using the Truss Head
Screws (18) and Round Nuts (19), and then laminate. Use 616G12 Carbon Fiber Webbing to
reinforce the perlon stockinette lay-up in the area of the lamination anchor. Be sure to evenly
distribute the lamination resin during the lamination process.
When assembling the lamination anchor, tighten Set Screws (12) using the 710D4
Torque Wrench. Torque: 15 Nm/11 ft.lbs./138 lbs.in.
5 Adjusting the Bearing
The axis pins of the linkage bars are mounted in bushings. Their connection to the upper and
lower joint sections provides a hinge action. This type of bearing and assembly permits in-
creased or decreased friction while also permitting readjustment of tolerance variation as
wear occurs. To readjust, tighten the Lock Nut (14) using enclosed 709S18 Socket Wrench
(16) and tighten the Cap Screw (11) using a 5 mm Allen wrench (fig. 4).
Adjustments must be made to eliminate excessive clearance following 2 to 4 weeks of use.
Please also monitor this adjustment during routine maintenance of the knee and replace the
4Z43=H Knee Stops as necessary (15).
6 Adjusting Resistance to Motion
Flexion and extension resistance are adjusted independently by moving the pins within the
horizontally arranged slots at the front and back side of the piston rod in the Hydraulic Swing
Phase Control Unit (17). Use the enclosed Adjustment Aid (23) to make adjustments.
Moving to + = resistance increases
Moving to – = resistance decreases
6.1 Adjusting Flexion Resistance (fig. 5)
Moving the posterior pin (at the flexion side) to the right = resistance decreases =
easier flexion.
Moving to the left = resistance increases = stiffer flexion.
6.2 Adjusting Extension Resistance (fig. 6)
Flex the joint to gain access to the anterior pin.
Moving the pin to the right = resistance decreases = easier extension.
Moving the pin to the left = resistance increases = stiffer extension.