**2. Classifications of wounds**

Wounds are classified based on many criteria. An essential factor in managing the injury and the wound repair is the time elapsed since the injury. Thus, depending upon the time frame of healing, wounds are clinically categorized as acute or chronic [6].

### **2.1 Acute wounds**

The self-repairing wounds that proceed with an orderly healing process, with an anatomical and functional restoration as the end result, are called acute wounds. A total of 5–10 days or a maximum of 30 days is the duration of time needed for acute wounds to heal. The surgical procedure or traumatic loss of tissue gives rise to acute *Minimally Invasive Microneedle: A Novel Approach for Drug Delivery System and Infected… DOI: http://dx.doi.org/10.5772/intechopen.105771*

#### **Figure 2.** *A photograph of an acute wound or self-repairing wound [6].*

wounds. Traumatic wounds usually involve bone fractures or only soft tissue [6]. An image of the acute wound can be a small cut on the finger, as shown in **Figure 2**.
