A driveline is a thin cable that passes through the skin and connects an implanted heart pump to its external power source and controller. It is one of five core components of a left ventricular assist device (LVAD), a mechanical pump placed inside the chest to help a weakened heart circulate blood. The driveline carries electrical wiring and an air vent from the internal pump out to battery packs and an electronic controller, which patients typically wear on a belt or shoulder holster.
For the thousands of people living with an LVAD, the driveline is both a lifeline and a daily management challenge. It exits the body through a small opening in the abdomen, and that permanent skin opening creates ongoing risks that require careful attention.
How an LVAD Works
Modern LVADs share five main components: an inflow tube that draws blood from the left ventricle, the pump itself, an outflow tube that sends blood into the aorta, the percutaneous driveline, and an external electronic controller. The word “percutaneous” simply means it passes through the skin. Everything inside the body, including the pump, depends on external power delivered through the driveline. If the driveline is damaged or disconnected, the pump can lose function.
Current continuous-flow LVADs are implanted as a bridge to heart transplant or as long-term therapy for people with advanced heart failure who aren’t transplant candidates. Support durations now commonly stretch beyond a year, and many patients live with these devices for several years. That extended timeline is why driveline durability and infection prevention matter so much.
Why the Driveline Is a Weak Point
The driveline is widely considered the most vulnerable part of the entire LVAD system. Two problems dominate: infection at the skin exit site and physical damage to the cable itself.
Because the driveline creates a permanent opening in the skin, bacteria have a direct path into the body. Driveline infection remains a major complication of long-term LVAD therapy. Large-scale studies and registries have consistently reported infection rates ranging from 20% to over 50% of patients. A recent study of a newer fully magnetically levitated device found notably lower rates, with driveline infections occurring in about 11% of patients over a median support period of 1.6 years. Cumulative risk climbed over time: roughly 2.8% at six months, 5.6% at one year, and 8.5% at two years.
Physical damage is the other concern. Over months or years of daily wear, the cable’s outer sheath can crack or fracture from material fatigue, accidental tugging, or simple carelessness. In one reported case, a patient’s driveline developed a 15-millimeter fracture in its outer covering right at the skin exit point. The internal metal wiring still worked, so a full pump replacement wasn’t needed, but the damage required repair and raised the risk of infection at the exposed area.
Signs of a Driveline Infection
Driveline infections are the most common LVAD-specific infection. They typically involve the soft tissues surrounding the cable where it exits the skin. The hallmark signs include redness and warmth around the exit site, pus or cloudy drainage, hardening or discoloration of the surrounding skin, pain along the cable tunnel under the skin, and in more advanced cases, abscess formation. These infections can range from superficial skin involvement to deep infections that track along the driveline tunnel toward the pump itself, which is far more serious and difficult to treat.
Daily Driveline Care
Preventing infection requires a strict dressing change routine at the exit site. Every LVAD center has its own protocol, but the core steps are consistent. All 15 protocols reviewed in one study required cleaning the skin around the driveline exit site with chlorhexidine gluconate, an antiseptic solution. Best practice calls for scrubbing in a back-and-forth motion for at least 30 seconds, then letting the antiseptic dry completely for another 30 seconds before applying a new dressing. Only about a third of centers also specified cleaning the driveline cable itself, not just the surrounding skin.
Most protocols reference a dressing change kit that includes an antimicrobial covering placed over the exit site. About 70% of centers use a chlorhexidine-impregnated disc, while the remaining 30% use a silver-based covering. These barriers sit directly over the wound to reduce bacterial colonization between dressing changes.
Securing the Driveline
Preventing the cable from being pulled, twisted, or snagged is just as important as keeping the exit site clean. Any tugging at the exit point can damage tissue, widen the opening, and invite infection. Once patients begin moving around after surgery, the driveline needs to be anchored to the body.
One common approach combines an adhesive stabilization device that sticks to the skin with a small silicone wing (borrowed from central venous catheter kits) that grips the cable. The cable is threaded through the wing and secured with a silk tie or silicone tape to avoid scratching the cable’s surface. This keeps the driveline from shifting at the exit site during everyday movement. Many patients also use abdominal binders or specially designed belts to hold the external portion of the cable, controller, and batteries close to the body and out of the way.
Living With a Driveline
The driveline affects nearly every aspect of daily life for LVAD patients. Showering requires waterproof dressing covers or careful technique to keep the exit site dry. Swimming and submerging in water are off-limits. Sleeping requires awareness of where the cable runs so it doesn’t get caught or kinked. Physical activity is encouraged for recovery, but contact sports or anything that risks a blow to the abdomen is avoided.
Patients carry their controller and batteries at all times. The external equipment typically weighs a few pounds total. Spare batteries and a backup controller are kept nearby. Because the driveline is the only connection between the implanted pump and its power source, any interruption, even briefly, can be life-threatening.
Wireless Power Technology
Eliminating the driveline entirely has been a goal for decades. The idea is to transfer energy wirelessly through the skin using a system called transcutaneous energy transmission, removing the need for any cable exiting the body. This has actually been done before. The AbioCor total artificial heart used wireless power in a clinical trial involving 14 patients across five U.S. hospitals, with the longest support lasting 17 months and no serious power-system complications reported. Another device, the Arrow LionHeart, became the first fully implantable LVAD designed for long-term use. Six patients received it, with an average support duration of 245 days and a 50% survival rate at 18 months.
Neither device gained widespread adoption, and no currently available commercial LVAD operates without a driveline. Newer wireless systems are in development, including one that uses a charging belt worn around the chest and an internal battery capable of more than eight hours of untethered operation. A wrist-worn monitor alerts the patient when the internal battery needs recharging. These systems aim to give patients genuine freedom from being continuously connected to external equipment, not just reduce complications but fundamentally change quality of life. Longer-term safety data in larger groups of patients is still needed before these systems reach routine clinical use.