Across the horizon: the rising sun and endless possibilities
 
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

Home - Studyworld Studynotes - Quotes - Reports & Essays 

 

STUDYWORLD STUDYNOTES:

CLASSIC LITERATURE ANALYSIS

STUDYWORLD REPORTS & ESSAYS

RESEARCH AND IDEA DATABASE




Oakwood Publishing Company:

SAT; ACT; GRE

Study Material


xx

 


History

Science

Biography

Creative Writing

Literature

Social Issues

Music and Art
Reports & Essays: Science - Physical

"AND""OR"

Microsurgery: Sew Small
A man came into the emergency ward at one o'clock. His thumb came in an hour later. The surgeon's job: get them back together. The successful reattaching of fingers to hand requires long hours of painstaking work in microsurgery. In the operating room , the surgeon doesn't stand, but sits in a chair that supports his/her body. His/her arm is cradled by a pillow. Scalpels are present as are other standard surgical tools, but the suture threads are almost invisible, the needle thinner than a human hair. All the surgical activity revolves around the most important instrument, the microscope. The surgeon will spend the next few hours looking through the microscope at broken blood vessels and nerves and sewing them back together again. The needles are so thin that they have to be held with needlenosed jeweler's forceps and will sew together nerves that are as wide as the thickness of a penny. To make such a stitch, the surgeon's hands will move no more than the width of the folded side of a piece of paper seen end on! Imagine trying to sew two pieces of spaghetti together and you'll have some idea of what microsurgery involves. Twenty-five years ago, this man's thumb would have been lost. But in the 1960s, surgeon's began using microscopes to sew what previously had been almost invisible blood vessels and nerves in limbs. Their sewing technique had been developed on large blood vessels over a half century earlier but could not be used in microsurgery until the needles and sutures became small enough. The surgical technique, still widely used today, had taken the frustrating unreliability out of sewing slippery, round-ended blood vessels by ingeniously turning them into triangles. To do this, a cut end of a blood vessel was stitched at three equidistant points and pulled slightly apart to give an anchored, triangular shape. This now lent itself to easier, more dependable stitching and paved the way for microsurgery where as many as twenty stitches will have to be made in a blood vessel three milliliters thick. The needle used for this can be just 70 milliliters wide, only ten times the width of a human blood cell. All this technology is focused on getting body parts back together again successfully. The more blood vessels reattached, the better the survival chances for a toe or a finger. The finer the nerve resection, the better the feeling in a damaged part of the face, or control in a previously useless arm. The wounded and severed body part must be treated carefully. If a small part of the body, such as a finger is cut off, instead of torn, wrapped in a clean covering, put on ice and then reattached within a few hours, the chance of success is over ninety percent, as long as one good artery and one good vein can be reattached. Not only is micro surgery allowing body parts to be reattached, it's also allowing them to be reshuffled. Before 1969, nothing could be done for a patient if a thumb was smashed beyond repair. Today, in North America, hundreds of big toes are removed from feet and grafted onto hands. Sometimes tendons are shifted from less important neighboring fingers to allow the thumb to work better in its unique role of opposing the other fingers and allowing us to grip. Farmers, laborers, car accident victims, and home handymen are the people most often helped by microsurgery replants. The ability to reattach blodd vessels also benefits burn victims. Flaps of their healthy skin are laboriously reattached more successfully, blood vessel by blood vessel, to increase chances that the graft will take. Some women, whose diseased Fallopian tubes have become blocked, can have them reopened microsurgically. When a cancerous esophagus must be removed, it can be replaced using a section of the person's own bowel. These people can then lead a more normal life, using their mouth for eating instead of having food inserted through a feeding tube into their stomach. Doctors have been able to rebuild an entire lower face by sculpting the lower jaw from living hip bone and covering it with the skin from that piece of bone. In all, over seventy parts of the human body can be used as donor backups and recycled into other damaged sites.

 



Teacher Ratings: See what

others think

of your teachers



Copy Right