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WillowWood ® SACH Foot Instructions
WHAT'S IN THE BOX
WillowWood SACH Foot
M10-1.5 x 38 mm bolt (Part No. 700-B118)
3 Heel Inserts (Soft, Medium, Firm)
MODIFYING THE FOOT
Do not alter the top of the foot sufficiently to change the angle between the bolt hole and the top of the foot. This may cause bolt fracture
due to the resulting bending moments that may be generated due to uneven mating surfaces.
The urethane foam shell may be lightly sanded with little resulting loss of strength. Do not expose the internal components of the foot,
as this could reduce the structural integrity of the foot.
EXPOSURE TO WATER
The WillowWood SACH Foot is essentially water resistant, provided no open cracks have developed and no area of the foot has been
sanded. Seal the bolt hole before exposing the foot to water. Complete submersion in water is not recommended.
FOOT BOLTS
WillowWood recommends using the M10-1.5 x 38 mm bolt (Part No. 700-B118) and lock washer included with the WillowWood SACH Foot.
(A 3/8"-16 x 2.75" bolt, Part No. 700-B120, is also available for use with English thread components and for exoskeletal applications.) When
assembled, the end of the foot bolt must be within 2 mm of the top of the foot pyramid. (Please note that if the foot bolt extends more
than 2 mm above the foot pyramid, the bolt will interfere with the function of WillowWood Foundation components.) The use of fasteners
other than those provided for this product is done so at the sole judgement of the attending prosthetist. The use of the provided fastener is
not recommended for any product other than WillowWood feet.
To significantly reduce the possibility of bolt failure, the structures connected by the bolt must both be rigid. (Non-rigid structures demonstrate
slight deformation upon loading, resulting in bending of the foot bolt that inevitably leads to failure.) The WillowWood SACH Foot has
been thoroughly tested to ensure that no keel deformation will occur; the prosthetist is then responsible for selecting a component to
attach to the keel that is at least as rigid as the keel itself. The foot bolt is a high quality capscrew that has been manufactured especially
for this purpose, but WillowWood cannot guarantee its suitability for use with components from other manufacturers.
INSTALLATION
Foot Pyramid: Use the Titanium Foot Pyramid Adapter (Part No. 2LTC-1208) for best results. Since the ridge on the bottom of the Titanium
Foot Pyramid Adapter grips into the composite keel when it is tightened, no interface plate is necessary. However, if you will be changing
the position of the adapter numerous times (during a temporary alignment, for example), we recommend that you use a WillowWood
Interface Plate (Part No. 3F-6CC-002), a leather interface, or some similar temporary device to prevent excessive deformation of the keel.
WillowWood will not accept returns of feet with deformed keels. This temporary interface must be removed prior to final assembly of the
prosthesis in order to achieve adequate thread engagement of the foot bolt with the foot pyramid.
If using another manufacturer's foot pyramid, a special interface plate (Part No. 3F-6CC-002) may be required to accommodate the
keyways on the bottom of the foot pyramid.
Torque: Tighten the Foot Bolt to 30 ft-lbs (41 Nm).
Heel Inserts: Install heel inserts by pressing them into the recess on the bottom surface of the foot. No adhesive is necessary for defini-
tive use. Do not use the foot without a heel insert in place.
Exoskeletal Applications: The WillowWood SACH Foot can also be used for exoskeletal applications. When using a wood ankle block,
apply a thin layer of epoxy adhesive between the keel and the ankle block to prevent rotation. When using a polyurethane ankle
block, use a WillowWood Interface Plate (large size) attached with epoxy adhesive. Exoskeletal applications may require the use of a
3/8"-16 x 2.75" foot bolt (Part No. 700-B120).
PATIENT ADVISORY WARNING
The attached Patient Advisory Warning enables you, the prosthetist, to effectively notify your patients of the limitations of the components in their
prosthesis, and of the need to monitor their weight and activity levels. Please review the Patient Advisory Warning with the patient upon delivery
of a prosthesis with a WillowWood SACH Foot. The patient and the prosthetist should then sign the Patient Advisory Warning to acknowledge
that it has been reviewed and understood by both parties. Give one signed copy to the patient and place one copy in the patient's file.
If a patient's weight or activity level increases after receiving a prosthesis with a WillowWood SACH Foot, the patient should immediately contact
the prosthetist to determine whether replacement components are necessary. If a patient continues to use a prosthesis with a WillowWood SACH
Foot after experiencing an increase in weight and/or activity level, the foot could fail with the possibility of serious injury to the patient.
To ensure that the correct components are selected for each patient, the prosthetist should weigh the patient on scales in the prosthetist's
office. Do not rely on the patient's estimate of his/her own weight. Instruct the patient to monitor his/her weight weekly to ensure that it
remains in a range appropriate for the prosthetic components being used.
WARRANTY
The warranty for the WillowWood SACH Foot is one year from date of invoice. Use of the WillowWood SACH Foot for amputees whose adjusted
body weight is more than 250 lbs (115 kg) or who engage in extremely high and abusive activity is against WillowWood's recommendations and will
void the one year warranty. Adjusted body weight is defined as the weight of the amputee plus any loads carried by the amputee.
"Extremely high and abusive activities" are defined as activities such as skydiving, karate, and judo; activities that could result in injury to an
individual's natural feet; and activities that expose the prosthesis to corrosives such as salt water.
WARRANTY DISCLAIMER
WillowWood warrants that each product manufactured will, at the time of delivery, be of workmanlike quality and substantially free of defects.
WILLOWWOOD MAKES NO OTHER WARRANTY, IMPLIED, OR EXPRESSED, AND MAKES NO WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. This warranty shall terminate immediately upon an action to combine our products with other
materials or in any manner to change the nature of our products. The sole remedy is replacement of the products or credit for the products.
WillowWood's liability shall not exceed the purchase price of the product. WillowWood shall not be liable for any indirect, incidental, or
consequential damage.
WILLOWWOOD RETENTION OF RIGHTS
WillowWood retains all intellectual property rights reflected or incorporated in its physical products, regardless of the transfer of the
physical products to another party or parties.
The Ohio Willow Wood Company
15441 Scioto Darby Road
Mt. Sterling, OH 43143
phone 740.869.3377 / 800.848.4930
fax 740.869.4374
www.willowwoodco.com
Lock Washer
Instructions
Patient Advisory Warning
Ohio Willow Wood Company B.V
Keizersgracht 62/64
1015 CS Amsterdam
The Netherlands
PN-1096-G
05 SEPT 2017
