In the ER, Sugical scissors are most commonly used for cutting. Most scissors are designed for use with the right-handed grip that enables direction control & precision of cuts. Having a thumb-ring grip gives the best control & movability that gives max closing, shear & torque forces with a natural grip-ping motion of the right hand.
Pronation to normal hand positions gives the greatest maneuverability of surgical scissors in different directions. The supinated hand can move only toward the prone position & therefore has limited maneuverability.
If the flaccid tissue us successfully placed correctly between the surgical scissors then it can be cut just fine. When surgical scissors cut, they give force, shear & torque to produce an exact cut. Push-cutting allows straight cuts along the grain of a piece of tissue. "chewing" results in a jagged, crushed wound from tissue trapped between the blades of the surgical scissors lacking in shear & torque forces.
When your cutting sutures with your scissor tip, seek out for the knot in between the slightly spread blades, as opposed to under your scissors. Use the left hand, the patient's body, or some other structure thats stable be sure to steady the scissors when you do a delicate cut or when cutting sutures held by another person. When your cutting a row of sutures, hold the sutures in your left hand do this so the single one can "taut" as you cut it and they do this so that the slice sutures are held out of the way.
Blunt dissection can be done by spreading scissor blades between tissue planes or by doing a probe or rake by using surgical scissors. Its sometimes ok to do blind dissection when its useful in between tissue plane structures.
Curved surgical scissors offer greater movement and visibility, Straight surgical scissors give the best possible mechanical advantadge when cutting through thick, tough skin.
When looking for the primary surgical scissors the market has to offer. One should keep in mind that control & maneuverability are crucial. These scissors are primary for blunt dissection & sharp cutting.
Most surgical scissors are designed & designed so that three force vectors are for to cut: torque, closing and shearing. These forces are transferred from the hand to the shanks, and then get a fulcrum to the cutting edges. The closing force is that what causes the blades to come together. Shearing is when you blade the two blades flat up against the other. Mainly a cutting movement. Torque is the force that rolls the leading edge of each blade inward to touch the other. Alot of surgical scissor designers create these devices so when you move your hands in the right motion the cut automatically slices through perfectly.
In cutting, direction control and accuracy depend on the stability of the tissue between the surgical scissor blades & the safety of the operator's grasp on the scissors and the closer the tissue is to the fulcrum, the more on this. The blades tend to push the tissue away, making a buncking effort of the slicing action. When cutting be sure to include an obtuse type of angle between the blades. You will receive a non-accurate cut if try to stabilize the tissue, using the scissors.
To acheive a crisp, clean cut, try using the the grip that is designed to the three force vectors. The most familar and greatest way to hold these surgical instruments is by putting your ring finger through the rings and the ends of your thumbs holding the medical instruments & with the index finger resting on the shanks next to the fulcrum. This grip gives the biggest type "tripod" and there by giving you the best direction for overall pivotial control. The normal grasping motion of this grip applies maximum shear, torque & closing forces; and is therefore the grip that gives maximum control. The thumb and middle finger grip which gives the index finger to be used to support the sides of the shanks. The resulting three-point grasp makes a smaller tripod than the previous method and is, there by getting it slighty more unstable.
The thumb-index finger grip, with the surgical scissors held to cut in a forward direction. A grip like this, uses something called 2 point direction control, which can allow a cut to go off course. The force may be strong when closing, doing this type of gripping makes the least torque strength & shearing able to cut forward. When you have the slightest torque & shear the blades may tend to make a choppy motion in the cut like it was chewed as opposed to a nice clean cut.
To cut in an opposite direction use the thumb-index finger grip. This sort of grip gives good 3 point directional control with a well lateral control, but the shear and torque forces are virtually nonexistent, this way will need push cutting as a main technique.
All grips discusses to this point provide strong closing force. The thumb-ring finger grip provides the best direction, shear & torque forces. If you cut backwards, the grip is most secure in direction control. The other two grips, if used in reverse cutting, lose their directional stability.
As well as being a great medical tools for sharp cutting, surgical scissors with proper tips are ideal for blunt dissection by ranking, probing or spreading. For blunt cutting, surgical scissors have an added ability as opposite to a clamp, because switching back and forth from blunt cutting to sharp can be accomplished without changing surgical instruments. Blunt dissection separates tissue layers themselves. If you see any cementing substance it may be normal areolar tissue, as between fascial layers, or scar tissue from former surgery.
Be aware of hurdles when cutting through the differnet sections of scar tissue, espically where the scar tissue comes in together with one of the layers. It's considered risky when the cutting between layers when the adhesions have more tensile strength than the bound layers. A scar may bind bowel to fascia or parietal pericardium to the heart with better tensile strength than is present within the bowel or within the myocardium. You may not want to use blunt dissection with your surgical scissors in this instance and can result in an unintended enterostomy or entry in the myocardium. It is therefore dangerous for blunt cutting where former scars traverse natural planes or where dense scar tissue is tougher than the structures it blinds.
Normally when doctors cut using surgical scissors its in direct view. Blunt dissection and blind cutting could be useful, secure & accurate. Sometimes blind dissection is done in between the tissue planes in the anatomic regions away from such critical structures as big vessels and nerves. To open up a tunnel beneath the dermis, you will want to use the blind surgical scissor dissection method to insert a bovine heterograft when creating an arterial venous fistula.
You can also put blind surgical dissection to work in your favor while your doing a breast biopsy in a small cirumareolar incision. Often it is hard to see the deep side of a breast lump; but, by palpation, when you use a left pointer-giner as a guide, scissors could be used to circumscrive and get rid of the lump.
When you expose major blood vessels by cutting, exercise caution to avoid contusing the vascular wall or tearing tiny tributaries & branches. If surgical scissors are used to spread parallel to a major vessel, be sure to focus & not make any tearing of side branches; whereas if spreading is done perpendicular to the great vessel; direct your attention plaques. Both methods, do have setbacks, could be used if only the promblems are understood.
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