Learning to learn: Simulators are easy, inexpensive to make
By Ted Warren
At ACP's Internal Medicine meetings, the workshop on incision and drainage of abscesses is one of the most popular activities of the Herbert S. Waxman Clinical Skills Center. With the right teaching materials and minimal equipment, this procedure can be taught in the institutional or office setting, as well.
Creating a simulated abscess is an easy and inexpensive process and can provide a surprisingly realistic model that helps teach the motor skills and steps necessary to properly incise, drain and dress an abscess. The Waxman Center model was originally developed by Thomas Rebbecchi, MD, an associate professor of emergency medicine at Cooper University Hospital in Camden, N.J., and has since been used at ACP chapter meetings as well as at Internal Medicine meetings.
The following is a step-by-step process for creating a homemade simulated abscess model, a list of equipment needed for the procedure, and a guide through the procedure.
Creating the simulation pad
- 1 simulation skin suturing pad (simulated skin pads are available from Limbs & Things and other medical simulation suppliers)
- 1 utility blade or scalpel (sharp!)
- 1 five-inch balloon
- 1 tube toothpaste
- 1 container rubber cement glue (or other glue suitable for adhering closed cell foam)
- 3 or 4 clamps, binder clips or other clips suitable for clamping a half-inch thick soft object
Use a utility knife to slice the very top of the simulated skin pad off to about three-quarters of the way down the pad. This is best done by cutting with a very sharp blade and using light strokes while pulling back on the top flap. This should leave a flap of “skin” that is about an eighth of an inch thick.
Fill the balloon with about 1 oz of toothpaste, making sure the paste is all the way down at the rounded end of the balloon. This is best achieved by pushing the sides of the balloon down around the nozzle of the toothpaste tube until you are at the end of the balloon. Tie off the balloon as close to the toothpaste as possible and cut off the remaining balloon beyond the knot.
Hints: Make sure not to use too much toothpaste. The average abscess is not very large and you do not want too much tension under the skin pad flap when trying to glue it back down. In addition, try to remove any air that might be trapped in the balloon, as this will make the balloon stiff and also increase the tension under the “skin” flap.
Once the top of the simulated skin pad is cut, a toothpaste-filled balloon is placed in the middle of the pad. Photo by Ryan DuBosar.
Place the balloon in the middle of the exposed cut surface of the simulated skin pad. Make sure the toothpaste-filled portion is on top of the knot so that the knot cannot be felt through the surface of the pad. The balloon knot should not be against the top surface that will be cut into during the procedure.
Apply rubber cement liberally to the balloon and both exposed cut surfaces of the skin pad foam.
Use clamps to clamp the top flap down against the rest of the foam pad. Don't worry if glue oozes out of the sides due to the pressure. The rubber cement can be cleaned up later once it has dried.
The finished product: a simulated abscess. Photo by Ryan DuBosar.
Allow about two to three hours for the glue to dry. If the flap starts to pull apart from the pad due to tension, apply more glue and clamp again. Pressure applied on top of the skin pad around the “abscess” lump will increase adherence of the top flap to the rest of the pad and will make for a more realistic appearance of swelling underneath the skin.
Hint: The toothpaste will start to harden in the balloon after about one or two months, so try to use the abscess simulation pads within that time period.
Performing the procedure
List of supplies and equipment (for workshop participants):
- universal precaution items
- antiseptic solution for skin cleansing
- needle and syringe for local anesthesia (small-gauge needle, 25 g)
- 1% or 2% lidocaine with or without epinephrine
- scalpel blade (#11 preferable)
- culture swabs
- curved hemostats
- syringe and 18-g angiocatheter for irrigation with nonsterile saline
- gauze for packing (one-quarter or one-half inch), medicated or plain
Instructions for procedure:
- Review possible complications and alternative treatments
- Prepare site with antiseptic solution (e.g., povidone-iodine)
- Inject 1% or 2% lidocaine with or without epinephrine at surface area to be incised, or perform local field block
- Consider oral or parenteral pain medication
- Stab incision with scalpel at center of abscess
- Incise one-half to three-quarters the length of abscess along existing skin tension lines
Facilitate wound drainage
- Gently compress abscess
- Disrupt loculations with hemostat
- Inject nonsterile saline via syringe and soft angio-catheter
- Pack all four quadrants with gauze
Dress surgical site
- Apply dressing
Provide patient instructions for follow-up care
Ted Warren is the Education and Career Development Administrator for the American College of Physicians.
About the Herbert S. Waxman Clinical Skills Center
The Herbert S. Waxman Clinical Skills Center is a collection of dynamic, hands-on educational workshops that allow attendees of ACP's Internal Medicine meeting to refine or learn new examination skills and procedures that can be used in inpatient and office settings. The Center has been an integral part of the annual meeting for over 10 years.
Participants at the Herbert S. Waxman Clinical Skills Center work in small groups with expert faculty to learn the ins and outs of procedures, from the fine motor skills necessary to essential information about supplies and equipment, indications and contraindications, and background diagnostic information.
Workshops on the incision and drainage of abscesses will be held at the 2011 Internal Medicine meeting in San Diego on April 7-9, 2011. The workshops will run during all three days of the meeting. Registration for this and other Waxman Center workshops is conducted on-site and is free for all registered attendees of the meeting. More information on Internal Medicine 2011 can be found online.
A number of the workshops offered at the Waxman Center over the years have been converted to packaged curricula that can be used by institutions to teach procedural, examination and communication skills. Topics include arthrocentesis and joint injections, common skin biopsy techniques, efficiency through effective communication, screening and prevention of diabetic foot ulcers, counseling for behavior change, and more.
For questions about this series of teaching modules or the Waxman Clinical Skills Center, please contact the Education and Career Development Department at 215-351-2614, or send an e-mail.
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