Retractor (medical)

A retractor is a surgical instrument used to separate and manipulate the edges of a surgical incision or wound, or to hold back underlying organs and tissues so that body parts underneath may be accessed.

The broad term ''retractor'' typically describes a simple steel tool possessing a curved, hooked, or angled blade, which when in place helps to maintain the desired position of a given region of tissue during surgery. These simple retractors may be handheld, clamped in place, or suspended at the end of a robotic arm. Retractors can also be "self-retaining," and not need to be held once inserted, having two or more opposing blades or hooks which are separated via spring, ratchet, worm gear or other method. The term ''retractor'' is also used to describe distinct, hand-cranked devices such as rib spreaders (also known as thoracic retractors, or distractors) with which surgeons may forcefully drive tissues apart to obtain exposure. Different surgery specialties can have specific kinds of retractors - e.g., for certain kinds of spinal surgery, such as Minimally Invasive Transforaminal Lumbar Interbody Fusions, some retractors are fitted both with suction and with fiberoptic lights to keep deep surgical wounds both dry and illuminated.

Surgical assistants, whether they be specifically Certified Surgical Assistants, Registered Nurse First Assistants, Physicians Assistants, or Surgical Technologists, may assist surgeons in the process of retraction.

History

Surgical retractors probably originate with very basic tools used in the Stone Age. Branches or antlers of various shapes were used to dig and extract food from the ground. As the use of tools evolved, a variety of instruments came about to substitute for the use of hooked or grasping fingers in the butchering of meat or dissection of bodies. The use of metals in tool making was of great importance. A variety of Roman metal instruments of the hook and retractor family have been found by archeologists. These instruments would generally be called hooks if the end was as narrow as the handle of the instrument. If the end was broad, it would be called a retractor. Also arising from this group of tools were other related tools for displacing (elevators and spatulas) and scooping (spoons and curettes).

In 4th century CE, Indian physician Susruta used surgical tools such as retractors. In a description of the procedure of tonsillectomy from the 7th century CE, Paul of Aegina documents the use of a tongue spatula to keep the tongue out of the way while a form of tonsil hook is used to bring the tonsil forward for excision. In 1000 CE Abu al-Qasim al-Zahrawi, also known as Albucasis or Abulcasis, described a variety of surgical instruments including retractors in his famous text Al-Tasrif. Vesalius described a variety of hooks and retractors in the 16th century. Jan Mikulicz-Radecki's invention of a hinged rib spreading retractor in 1904 prompted a flurry of development of retractors in the early 20th century, culminating in 1936 in our modern device based on the design of Enrique Finochietto.

Current

The following is an incomplete list of surgical retractors in use:

Hand-held retractors

* Hohmann Retractor
* Lahey Retractor
* Senn Retractor
* Blair (Rollet) Retractor
* Rigid Rake
* Flexible Rake
* "Cat's Paws" - sharp, wide rakes
* Ragnell Retractor
* Linde-Ragnell Retractor
* Davis Retractor
* Volkman Retractor
* Farabeuf Retractor
* Mathieu Retractor
* Jackson Tracheal Hook
* Meyerding Finger Retractor
* Little Retractor
* Love Nerve Retractor
* Green Retractor
* Goelet Retractor
* Cushing Vein Retractor
* Langenbeck Retractor
* Richardson Retractor
* Richardson-Eastmann Retractor
* Deaver Retractor
* Doyen Retractor
* Parker Retractor
* Parker-Mott Retractor
* Roux Retractor
* Mayo-Collins Retractor
* "Army-Navy" Retractor
* Ribbon Retractor - malleable, able to be bent as the surgeon desires

Self-retaining retractors

* Rultract Skyhook Retractor System
* Alms Retractor
* Lone Star Retractor - shaped ring retractor, segmented to allow individual 'lone stars' (hooks with lengths of stretchable rubber attached to them) to be placed in conjunction with it
* Galaxy II retractor
* Gelpi Retractor
* Gutow Retractor
* Weitlaner Retractor
* Beckman-Weitlaner Retractor
* Beckman-Eaton Retractor
* Beckman Retractor
* Balfour Retractor - typically used in lower abdomen and pelvic surgery
* Finochietto Retractor or Rib spreader
* Travers Retractor
* West Retractor
* Norfolk & Norwich Retractor

Gallery

File:Surgical retractor.jpg
File:Deaver retractor 01.JPG, Deaver retractor
File:Surgical retractor Orem.jpg, Army-Navy Retractor
File:Amputation retractor.svg, Amputation retractor

References

Famous Canadian Physicians: Dr. Norman Bethune
at Library and Archives Canada

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Surgical instruments