Retractors

Surgical retractors are used to hold an incision or a wound open, these are also used to hold a tissue or an organ for access and visibility.  Retractors are manufactured from stainless steel and available in various sizes and shapes. Generally, these can be divided into two categories.

Handheld Retractors 
Handheld retractors are versatile tools and can be readily moved. As these are handheld, the surgeon can apply as much or as little force as desired. Medical Tools has a wide range of various sizes, blade lengths, and shapes.
Examples of hand-held retractors are Deaver's, Langenbeck's, Kelly and Senn-Miller.

Self Retaining Retractors
Self-retaining retractors remain open unless closed. These have screws, ratchets or clamps which holds the retractor open. Self-retaining retractors allow hands-free operation during a procedure. These retractors are used for the procedures where incision needs to be kept open for a longer period.
Examples of self-retaining retractors are Finochietto, Gelpi, Weitlaner and ALM retractors.