FAQs

The Tapered style is for very conical or bony limbs or for Symes amputees. The gel thickness on the sides of the liner increases toward the distal end.
The Contoured style is for active amputees, or amputees who have a sharp, non-rounded distal tibia. They need extra padding at the front of the socket to protect the tibia.
The Uniform style is for amputees with very evenly-shaped residual limbs. The gel is uniformly thick throughout the liner.
The Progressive gel style is available only for the Alpha Select Liner. It features thicker gel at the distal end and in the tibial crest area, and thinner gel behind the knee and at the proximal edge.

How should Alpha® Liners be cleaned?

At the end of the day, wash the liner with water and a body soap that does not irritate the skin. Allow the liner to dry on the drying stand overnight. Once a week, disinfect the liner by wiping the gel with ethyl or isopropyl alcohol and allowing the liner to dry overnight.

What should Alpha Liner wearers do to deal with daily changes to the volume of their limbs?

Examine Alpha® Liners daily. Report any signs of unusual wear to your prosthetist.
Apply Volume Management Pads, made of 3mm-thick Alpha® Gel, on the limb in the area where volume has been lost – for example, at the back of the leg for a BK amputee.
Avoid the use of socks, which increase the volume symmetrically (not just in the places where volume has been lost).

What might cause an Alpha® Liner user to develop a skin irritation?

Although our Alpha® liners have proven to be very skin-friendly for most amputees, we do occasionally hear reports of skin irritations. Possible causes:
Not cleaning the liner daily. Neglecting to clean the liners daily may cause a rash to occur on the residual limb due to a buildup of bacteria from the skin.
Not rinsing all the soap off the liner. Soap residue may cause an irritation to develop.
Not drying the liners correctly. Drying the liner gel side out (instead of gel side in) can damage the liner and can allow dirt to stick to the gel, which can lead to skin irritation.
Not disinfecting the Alpha Liner with alcohol every week. If a rash appears after two or three months of using an Alpha Liner, this is the likely cause. Note: using an anti-bacterial soap instead of alcohol is not an effective means of disinfection
Use of a harsh or irritating soap, lotion, or cream. Use the same soap on the liner that is used in the bath or shower. Do not use talcum powder, or any creams or lotions that contain animal fats or oils (lanolin, vitamin E oil, etc.) or hydrocarbon oils (petroleum jelly, silicone oil, etc.).
Pulling the liner onto the limb instead of rolling it on. Some amputees will grab the top edge of the liner and try to pull it as high on the leg as possible, like putting on a boot. This can lead to irritation along the top edge of the liner. Be sure to roll the liner onto the limb without pulling.
Gouges, holes or other damage on the gel surface. Cleaning the gel by scrubbing it instead of wiping it gently can cause damage.
Liner is loose. If a liner is too big, or if the limb has shrunk, air can get trapped between the skin and the liner. This can result in excessive sweating that can lead to a rash. Also, a liner that is too loose allows the limb to rub back and forth on the liner. Try applying Volume Management Pads to the area that has shrunk.
An allergic reaction. Though we’ve never had a documented case of an allergic reaction to the Alpha gel, it’s possible. To rule this out, put a clean piece of Alpha gel somewhere else on the body for a few days to see if the skin reacts the same way.
Fungal and/or bacterial infection. This will require treatment from a dermatologist.

Are there any tips for traveling with Alpha® Liners?

Trim the drying stand to a shorter length to make it easier to fit in a suitcase.
When packing a liner in a suitcase, put some socks or a t-shirt in a plastic bag and roll the liner over it.
To dry a Locking Liner without having to pack a drying stand: take a shoe string (or other similar string), tie a slip knot on both ends, slip one knot over a coat hanger, slip the other end around the pin on the end of the liner, and hang the liner to dry.
Avoid leaving Alpha Liners in hot places (like the trunk of a car), because the heat can deform the liner.
Pack some Volume Management Pads to help deal with daily volume fluctuations.

Which type of liner is better…prefabricated or custom?

It depends on the residual limb. Prefabricated Alpha® Liners are great for amputees who have more regularly-shaped limbs. Amputees whose residual limbs are scarred, bony, short, or uneven in shape may be candidates for a custom Alpha DESIGN Liner.

What is an Alpha DESIGN® Liner?

It’s a liner in which the gel pattern has been created specifically to address an individual amputee’s needs – for example, thicker gel in certain areas to accommodate sensitive areas or invaginations.

Can I get the Select fabric, gel, and umbrella on a DESIGN liner?

Not at this time, but please contact our DESIGN team at 800-848-4930 to discuss the most suitable alternative for your patient.

How do I bill for a DESIGN Liner?

The suggested code for an initial DESIGN Liner is L-5681 or L-5683. The suggested code for a duplicate liner is L-5679 for a cushion liner, and L-5673 for a locking liner.

Are DESIGN Liners pre-flexed?

No, but if want to facilitate knee flexion, you can design the liner so that the gel is thinner at the patella. Selecting the “Pre-Stretch Liner” option when ordering can also be helpful.

Are DESIGN Liners available in custom sizes?

No. The gel layer of the DESIGN Liner is the part that is custom-designed. The size of the fabric covering, and therefore the size of the liner, is not a custom option. DESIGN Liners are available in the same sizes as the prefabricated liners, plus 2 additional sizes. Each size is designed to fit a wide range of limb circumferences, so there’s a good chance that we’ll have a size that works for your patient. Give our DESIGN team a call at 800-848-4930 to discuss the options.

What exactly is pre-stretching and why does a custom liner need that?

For amputees whose limb circumferences are at the upper end of a size range for a liner, the liner may initially be slightly difficult to don. To make the liner easier to don, we can “pre-stretch” the liner over a model of your patient’s limb at no charge before shipping it to you.

Does WillowWood keep my original cast, and for how long?

We dispose of the cast after we digitize it, but we do keep the electronic shape on file forever.

What do I need to send WillowWood to get a DESIGN Liner made, and how should I cast?

Send a cast (or non-Tracer shape file) and a completed order form. If you choose to send a cast, use standard casting techniques.

What is the difference between the Alpha fabrics that are available for DESIGN Liners?

Alpha Original – Comfortable and dependable, the gel conforms to the shape of the residual limb and protects against abrasions and shear forces.
Alpha Spirit – Fabric is more flexible than Original and MAX, and adheres to Velcro®. Perfect for users with limited hand dexterity.
Alpha MAX – Fabric is three times more durable than Original and Spirit. Perfect for heavy-duty users.

What email address can I send DESIGN files or information to?

aopfiles@owwco.com

How long will it take to make the DESIGN Liner(s)?

From the day the cast or file is received, it takes 3 days to make cushion DESIGN Liners and 4 days to make locking DESIGN Liners.

What makes the Pathfinder® II different from other feet?

Unlike any other foot, the Pathfinder II features a toe spring, a foot plate, and a pneumatic heel spring all connected in a triangular configuration. This design provides shock absorption during heel strike without diminishing the energy return of the toe spring. The result is a foot that requires less energy for walking or running, yet provides excellent balance and stability.

Which prosthetic foot is best for a particular patient?

Every amputee is different, and every amputee has different needs. Amputees must talk to their prosthetists about their pre-amputation activity level, their current activity level, and the activity level they hope to achieve. Foot weight, energy return, and response must also be discussed so that the prosthetist can select a foot that matches the amputee’s needs.

Do you offer training courses on the LimbLogic VS?

We offer live courses for both prosthetists and technicians at our Summit Training Center. For those who are unable to attend the live courses, we also offer online courses. Click here to register for any of these courses.

Can LimbLogic VS be used with Thermoplastic Sockets?

Yes. When ordering the LimbLogic VS, be sure to specify that a thermoplastic socket will be used so that the correct adapter will be shipped.

What comes in a LimbLogic VS box?

Each single-unit box includes a LimbLogic VS pump, a hand-held fob, a lamination kit OR a thermoplastic fabrication kit, a patient accessory kit, the patient and prosthetist manuals, a battery charger, and an international power plug.

What comes in the Thermoplastic Drop-in Adapter kit?

A drop-in adapter, a Poron Filter, four M6 x 55 screws, a ¼ x 20 Cap Screw, a Plastic Anchor, a Latex Form, and two Forming Sleeves (one large, and one small). The kit also includes a fabrication instructional video.

To fabricate a thermoplastic LimbLogic VS socket, do I need a tooling kit?

Yes, a one-time purchase of a Thermoplastic Tooling Kit (LLV-02100) is required.

How many applications are available from the Resin Kit that comes with the Thermoplastic tooling kit?

You should get 6-8 applications from the resin in the kit. Additional resin is available by the gallon (LLV-02102).

Is the LimbLogic VS waterproof?

The newest version of the LimbLogic VS pump (the 1600 series) is waterproof for FRESH WATER only to a depth of 3 meters (10 feet) for up to 12 hours at a time. The hand-held fob is NOT waterproof and should not get wet.

What changed from the old unit to the new waterproof version of LimbLogic VS?

We improved the process for sealing each pump, and we test each unit to guarantee waterproofing.

May I return an older LimbLogic VS unit (1500 series) and get the new waterproof version (1600 series)?

Yes, if the LimbLogic VS unit is new and in an unopened box. Call us to get an RMA for the old unit and to place an order for the new unit.

Can the LimbLogic VS 1500 series be used in water?

LimbLogic VS has been water resistant since the product was launched. If a patient was in a wet environment, the LimbLogic VS was usually not at risk.

What is the warranty for the LimbLogic VS?

Two years. Damage from misuse is not covered.

Is there a trial period for the LimbLogic VS?

Yes, there is a 30 day trial period.

How much does the LimbLogic VS vacuum pump weigh?

190 gm (0.4 lbs).

What is the battery life for the LimbLogic VS?

The pump’s battery life depends on the quality of the seal and the amputee's activity level. Our tests show that the system can normally last between 1 day and 1 week on a patient. We recommend charging the unit daily. The fob has a user-replaceable CR2 camera battery that should last 6 months with normal usage.

Are any special procedures required for fabricating a socket for use with LimbLogic VS?

Yes. An airtight socket is critical to proper operation of the overall system. We recommend specific fabrication methods to achieve airtight sockets. These methods are included in the kit instructions, are available on our website, and are taught in our training classes.

When using the LimbLogic VS, does the socket need to be sealed?

Yes. An airtight sealing sleeve in normally required, but there may be other methods for achieving a good vacuum seal.

What type of maintenance is required for the LimbLogic VS?

Keep debris away from the filter in the socket, and flush the system monthly with water or isopropyl alcohol per the user instructions.

What are the LimbLogic VS system settings?

The vacuum is adjustable from 0 to 20 in-Hg (508 mm-Hg) with most BK patients using a 10 to 16 in-Hg upper set point. The default control range is a span of 6 in-Hg.

What type of liners should be used with the LimbLogic VS?

Our tests show that the best compatibility with vacuum is provided by Alpha Select Liners and pre-fabricated or custom Alpha MAX Liners. When using Alpha Select Liners, we typically use the Progressive gel pattern. You can use the Uniform gel pattern if you like, but the top edge tends to be bulky when it’s folded down onto the Alpha Flex Sleeve.

How do I convert from inches of mercury (in-Hg) to millimeters of mercury (mm-Hg)?

The LimbLogic VS System displays vacuum settings in inches of mercury. To convert from inches of mercury to millimeters of mercury, multiply by 25.4.

How does vacuum suspension work?

A negative air pressure is created between the outside of a fabric-coated liner and an airtight socket when the vacuum pump pulls the air from the between the liner gel and socket wall. The negative air pressure pulls the liner towards the wall of the socket. The liner gel creates a similar airtight seal to the limb, so when the liner is pulled towards the socket, the limb is held firmly in place.

What is the difference between suction suspension and vacuum suspension?

Both methods use a difference in atmospheric pressure to attach the socket to the residual limb. But because suction suspension uses a passive expulsion valve to allow air to leave the socket, a negative pressure differential is only created when the limb begins to move. The active pump used in vacuum suspension doesn't depend upon the limb position.

What L-codes are suggested for the LimbLogic VS system?

L-5781 for the vacuum pump, and L-7368 for the lithium ion battery charger.

What is the torque required to attach the LimbLogic VS pump to the prosthesis?

The M6 flathead screws provided should be tightened to 9 ft-lbs or 12 N-m of torque.

What is the difference between the System Maximum, the User Maximum, and the Upper Set Point?

The System Maximum is 20 in-Hg, which is the highest vacuum setting that is possible with the pump hardware.
The User Maximum is set by the prosthetist as the maximum vacuum level that should be applied to the limb. The User Maximum cannot be set higher than the System Maximum.
The Upper Set Point is the highest vacuum level that will be automatically maintained by the pump. It can be adjusted by the amputee, but cannot be set higher than the User Maximum.

Does WillowWood make prosthetic components for children?

Our pediatric product line, called P-POD™, includes feet, durable Alpha® Liners, and tough components...even a growth kit for accommodating growth spurts.

What is the difference between the P-POD™ SACH Foot and the P-POD™ Impulse® Foot?

The P-POD SACH Foot is a basic foot that is intended for children who are not mature walkers (when they walk, the heel may not come into contact with the ground at all). The P-POD Impulse Foot is intended for children whose gait has matured to the point where they can benefit from more advanced foot function.

When should a suspension sleeve (or seal) be worn?

A suspension sleeve should be worn with any kind of suction or vacuum socket to prevent air from entering the socket after it has been expelled. WillowWood offers the Alpha Flex Seal for use with the vacuum sockets, and the Alpha Suction Seal or Alpha Spirit Suction Seal for use with suction sockets (or with locking sockets if a little additional security is desired).

Which type of suspension is best – suction, vacuum, or locking pin?

What works best for one amputee might not be what works best for another, but here are some of the pros and cons of each method:

Locking Pin Suspension
Locking pin suspension, in which a pin on the bottom of liner fits into a lock in the bottom of the socket, gives many amputees the feeling of a secure suspension. It is also generally the easiest of these three methods to don and off. The main disadvantage is “pistoning”, which is when the liner and limb stretch out within the socket while the leg is swinging forward due to daily volume fluctuation. Also, the pin must be centered exactly within the lock, which can be hard for amputees who have poor eyesight.
Suction Suspension
Suction suspension holds the limb secure because air in the socket is forced out through a valve at the bottom of the socket, creating a vacuum effect. Pistoning is not an issue, because the weight of the prosthesis is not focused on one small point at the bottom of the socket. Also, there’s no need to line up a pin with a lock. However, a suspension sleeve is required to prevent air from entering the socket, which adds a little bit of weight and bulk.
Vacuum Suspension
Vacuum suspension, like suction suspension, uses a difference in atmospheric pressure to attach the socket to the residual limb. But because suction suspension uses a passive expulsion valve to allow air to leave the socket, a negative pressure differential is only created when the limb begins to move. The active pump used in vacuum suspension doesn't depend upon the limb position. A disadvantage is that this type of suspension requires more maintenance (battery charging, system flushing, etc.) than the others.

I am an amputee. Can I buy directly from WillowWood?

No. Because the selection and fitting of WillowWood products require the technical and clinical knowledge possessed by certified prosthetists, we do not sell any of our products directly to amputees. If you are interested in one of our products, talk to your prosthetist to see if it might be suitable for you.

Does weight gain or weight loss impact the comfort of a lower extremity prosthesis?

Yes. A gain or loss of more than 10 pounds can result in discomfort, change in gait, skin breakdowns, and stress on other parts of the body, and should be reported to the prosthetist so that appropriate adjustments can be made.

Can you recommend an amputee support group?

While we do not recommend support groups, we can suggest the following sources for information:

Ask your prosthetist or look for information in their office’s waiting area
Ask other amputees for recommendations
Search online for the closest group
Contact the Amputee Coalition at 888-267-5669 or go to http://www.amputee-coalition.org/npn_group_list.html for a list of amputee support groups that are registered with the National Limb Loss Information Center.

In addition to support groups, are there any additional resources for parents of amputees?

The Amputee Coalition holds summer camps for young amputees ages 10 through 17. Find out more at http://www.amputee-coalition.org/youth_camp.html.

How do I find the best prosthetist for me?

While we do not recommend specific prosthetists, we can suggest the following sources for information:

Other amputees: Suggestions from amputees who have amputations similar to yours can be especially helpful.
Amputee Support Groups: Support groups can be helpful resources for just about every situation an amputee faces. For a listing of Amputee Coalition member support groups in the US, visit http://www.amputee-coalition.org/npn_group_list.html
Your physician and/or hospital staff: Hospital staff members, including surgeons, physical therapists, nurses, and staff social/family workers may all be sources for suggestions.
Amputee Coalition: Call the Amputee Coalition at 888-267-5669 for a wealth of information to amputees on choosing a prosthetist.
The American Board for Certification in Orthotics and Prosthetics, Inc. (ABC) and the Board for Orthotist/Prosthetist Certification (BOC): The ABC and BOC are the two national boards that certify prosthetists and orthotists. Both organizations offer search features on their websites for locating prosthetists by city, state, zip code, or name. Contact ABC at www.abcop.org or 703-836-7114. Contact BOC at www.bocusa.org/how-choose-practitioner or call 877-776-2200.

What can an individual do to ensure that a prosthesis is covered by medical insurance companies?

Educate yourself: Take time to carefully review what your insurance covers, what requirements must be met, and if there is a lifetime maximum for any procedures or equipment.
Choose the plan best suited for you: Do your research of what options your employer or private insurance agent offers and select the plan that best suits your needs.
Take charge: Check with your employer’s human resource or benefits manager to see how your needs can be expressed when negotiating for new or renewal of the company’s insurance plan(s).
Don’t give up easily: When a medical claim has been declined, insurance companies do provide an appeals process.
For more information, contact the Amputee Coalition at 1-888-267-5669 or visit their website at www.amputee-coalition.org.

Some amputees wear cosmetic coverings over their prostheses and others don’t. Is there any reason for wearing a covering or not?

This is a very personal decision. Some amputees want to blend in, while others don’t mind if anyone sees their prostheses. There are many options available, ranging from fairly simple to highly customized. Talk to other amputees or to your prosthetist for more insight on this matter.

Plaster casting is so messy and time-consuming. Are there any alternatives?

WillowWood offers the OMEGA® Tracer® System, which allows clinicians to capture the shape of a limb electronically for the creation of a socket, a custom liner, or an orthosis.

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