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Please note that the recommendations do not necessarily represent the optimal selection for the
patient. When deviating from the selection data, the Functional Ring with the highest possible
stiffness should be selected.
If the patient feels like they are "bottoming out", a stiffer Functional Ring should be used.
4.3.2 Changing the Functional Ring
1. Remove the foothshell (see Section 4.2.1)
2. Loosen the retaining screw on the distal end of the aluminum housing (Fig. 2, item E) by use of
an allen wrench (6 mm). Remove the screw (Fig. 6, Step 1). This can be done from the bottom
or optionally by inserting the T-handle allen wrench (included in scope of delivery) through the
hole in the top of the pyramid.
3. Pull the shaft away from the Base (Fig. 6, Step 2).
4. Pull off the installed Functional Ring (Fig. 6, Step 3).
5. Select the desired Functional Ring (see Section 4.4.1).
6. Preparing the Functional Ring for initial use.
Prior to its first use, Otto Bock recommends that separately ordered Functional Rings should
be pre-compressed with the separately available Pre-compression Tool 4X247 to ensure pro-
per function. Without pre-compression, new Functional Rings can be overly stiff. If using the
preinstalled Functional Ring or an already pre-compressed unit please continue with step 7.
a.
Open the Pre-compression Tool.
b.
Place the Functional Ring in the Pre-compression Tool (Fig. 9)
c.
Completely compress the Functional Ring by tightening the screw completely or clamping
in a vise. (Fig. 10)
d.
Compression time: Minimum 3 minutes to a maximum of 15 minutes
e.
Open the Pre-compression Tool, remove the Functional Ring.
7. Slide the Functional Ring over the Shaft (Fig. 6, Step 4).
8. Caution - To prevent unintended loosening of the screwing and thus the risk of falling, clean
the threads of the prothetic foot and the retaining screw so that they are clean and free from
grease and other contaminants.
9. Reassemble the prosthetic foot (Fig. 6, Step 5 & 6). Secure the Retaining Screw with Loctite®
243 or 246 and tighten with a 6 mm allen bit in a torque wrench to 15 Nm (133 in-lbs); This
will need to be done by inserting the 6 mm allen socket going through the top hole in pyramid.
10. Insert the foot into the footshell (see Section 4.2.1).
4.4 Foam Cover
Both Footshell Connection Caps 2C20 (slim) and 2C19 (normal) serve as a detachable connec-
tion between the foam cover and the footshell. They snap into the proximal brim of the footshell.
Please observe the following recommendations:
1. For mounting to the footshell the connection caps of the sizes 21-25 have to be cut along the
cutting mark (Fig. 8).
2. Cut the foam cover to length, allowing for distal compression about 0.4 in (10 mm) for tran-
stibial and about 1.6 in (40 mm) for transfemoral covers.
3. With the connection cap attached to the footshell, pull the foam cover over the prosthesis,
reassemble the foot and mark the outer contours of the connection cap.
4. Remove the connection cap and clean the foam cover with Isopropyl Alcohol 634A58.
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