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RapidFit™ 12 Hole
Thermoplastic Lock Adapter Procedure For Transtibial
and Transfemoral Thermoplastic Sockets.
(RapidFit # 5030)
Swanson Regional Orthotic & Prosthetic Research Center has developed
the
RapidFit Method to improve patient care for lower
limb amputees.
RapidFit
Overview
For
a printable version in Microsoft Word select here
Before you begin: Read
directions completely
RapidFit # 5030 has undercuts and is not removable
Materials Needed: Lock, RapidFit™
Thermoplastic Lock Adapter Adapter # 5030, and Mold
Sealer
Tools needed: 5mm Hex Key, 6mm
Hex Key, #2 Phillips Screwdriver, Standard
Screwdriver, Cast Saw
Plaster Model Preparation
- Take the cast over the
suspension liner.
- Fill the cast with plaster
keeping the pipe 2" from the bottom of the
cast. The plaster model will have a center
protrusion replicating the distal end of the
suspension liner.
- Drill a ¼" hole
straight down through the center protrusion 1
1/4" deep.
- Flatten the distal end of the
model by removing plaster until the diameter of
the distal end of the model is equal to the outer
dimension of the attachment tooling. Caution: DO
NOT exceed the outer dimension of the tooling,
because the socket would be too short. If too much
plaster was removed, add back plaster to correct.
- Check how the tooling is
centered on distal end of the model. Any voids
between the model and the tooling should be filled
with plaster to create a smooth transition.
- Seal the plaster model using
an appropriate mold sealer.
- Apply a non-stick nylon
stockinette to the plaster model for a vacuum air
wick.
- Paint the distal end of the
cast around the knot in the nylon with a mold
sealer. This will glue down the nylon for
trimming. Let dry and trim the nylon in a circular
shape slightly smaller than the lock mechanism.
- Fasten the attachment tooling
with the four long nails provided with the
RapidFit Adapter. NOTE: Using the longer nails
provided in the RapidFit Adapter Kit will provide
a more secure attachment.
Lock Preparation
- Read the lock
manufacturer's directions for preparing the lock
for attachment to the plaster model. Remove the
lock cartridge from the lock mechanism. Install
and tighten the round fabrication sleeve with a
standard screwdriver. Fill in the screwdriver slot
on the round fabrication sleeve with (Fillauer)
fitting gel or clay putty.
- Attach the lock to the
RapidFit Lock Adapter with the six screws. Note:
the 6 x 3/8" stainless steel sheet metal
screws are used with the Delrin lock bodies and
the socket head cap screws are used with metal
bodies. Use a #2 Phillips Screwdriver to tighten
the sheet medal screws.
- Install the center hole
sleeve with o-ring to the bottom of the RapidFit
Adapter center threaded hole. Tighten with pin
tool. Attach the four-hole fabrication white
spacer block to the bottom of the RapidFit Lock
Adapter with the four 6 mm socket head cap screws.
Tighten the four screws to the spacer block with a
6mm hex key.
- Install the eight 5 mm hex
socket set screws in the RapidFit Adapter. The set
screws should protrude 3/16" for 3/16"
plastic or ¼" for ¼" plastic to the
mark the location for easy removal. Tighten with a
5 mm hex key.
- Fasten the Lock Mechanism
with the RapidFit Lock Adapter to the plaster
model using the socket head cap screw provided
with the lock mechanism. The Prosthetist should
check and adjust the RapidFit position for correct
rotation, then tighten with hex key.
- Vacuum form the test socket
using the blister or drape methods.
Trimming
- Let the test
socket cool down. Sand off the plastic on top of
the lock attachment bolt and remove the bolt with
a hex key.
- Trim out the four-hole spacer
block. Remove the four 6 mm socket head cap screws
with a 6mm hex key. Remove the four-hole spacer
block.
- Trim out and remove the test
socket from the plaster model. Sand and buff the
trim lines.
- Sand off the plastic on top
of the eight 5 mm hex socket set screws and remove
screws with a 5 mm hex key.
- Sand off the plastic covering
the round fabrication sleeve and remove it with a
standard screwdriver.
Assembly
- Remove any fitting
gel or stick wax residue from the lock body and
threaded attachment holes. Follow the lock
manufacturer's directions to reassemble the lock.
- Install and tighten the eight
5 mm socket head cap head screws and stainless
steel washers to secure the attachment of the
RapidFit Lock Adapter to the test socket. Tighten
with a 5 mm hex key to a torque setting of 12 Nm
or 9 foot pounds. Caution, care must be taken to
use the correct length socket head cap screws
provided with RapidFit Adapter so that the screws
tighten properly and securely. Do not substitute
these socket head cap screws.
- Optional: To install a
RapidFit Pin Cover remove the Center Hole Sleeve
from the bottom of the Lock Adapter center hole
using the pin tool. Install a RapidFit Pin Cover
or other accessory insert to the bottom of the
RapidFit Adapter center threaded hole. Tighten
with pin tool.
- Install the other
endoskeletal components according to
manufacturer's directions. NOTE: A set of four 6
mm x 16 mm stainless steel flat head socket screws
are provided with the RapidFit Adapter. Caution,
care must be taken to use the correct length flat
head screws provided with the Rapidfit Adapter so
that the screws tighten properly and securely. Do
not substitute these flat head screws. Apply
thread lock such as Loctite 242 to the four 6mm x
16 mm stainless steel flat head socket screws and
tighten to a torque setting of 12 Nm or 9 foot
pounds.
Filling the Thermoplastic
Socket with plaster
- Tape over the
distal foam contour on the inside of the socket
with masking tape in order to prevent the plaster
from leaking underneath.
RapidFit Socket Lamination
- You will need a
RapidFit 12 Hole Lock Adapter #5040 for laminated
sockets. Follow the RapidFit 12 Hole Lock Adapter
Lamination directions.
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