Medical device with extended wear adhesive patch

A medical device, comprising:

• a hub;
• and
• an adhesive patch coupled to the hub, the adhesive patch to couple the hub to an anatomy, the adhesive patch including:
• a first backing layer coupled to the medical device, the first backing layer composed of a first material;
• a first adhesive layer coupled to the first backing layer;
• a flexible second backing layer coupled to the first adhesive layer, the second backing layer composed of a second material that is different than the first material;
• a biocompatible second adhesive layer coupled to the second backing layer, the second adhesive layer to be coupled to the anatomy;
• and
• a liner removably coupled to the second adhesive layer.

An infusion unit, comprising:

• a hub to define a fluid flow path to receive a fluid;
• and
• an adhesive patch coupled to the hub, the adhesive patch to couple the hub to an anatomy, the adhesive patch including:
• a first backing layer coupled to the hub via ultrasonic welding, the first backing layer composed of a first material that facilitates the ultrasonic welding of the first backing layer to the hub;
• a first adhesive layer coupled to the first backing layer;
• a flexible, water resistant second backing layer coupled to the first adhesive layer, the second backing layer composed of a second material that is different than the first material;
• a biocompatible second adhesive layer coupled to the second backing layer, the second adhesive layer to be coupled to the anatomy;
• and
• a liner removably coupled to the second adhesive layer.