Difference between revisions of "Surgical Procedure"

From NeuroTychoWiki
Jump to: navigation, search
Line 30: Line 30:
 
|[[File:Fig14.jpg|400px]] || Elevate dura with traction sutures. One suture is held by assistant and the other by surgeon. The traction sutures are used to enlarge subdural space to prevent damaging brain when opening dura. Touch dura with knife gently in between tractions and cut slowly layer by layer. Cutting doesn't have to be long. ~5mm will be fine. If you cut through dura, you will see transparent liquid (spinal fluid) comes out. But if you don't see the leakage, it is still on the way.  
 
|[[File:Fig14.jpg|400px]] || Elevate dura with traction sutures. One suture is held by assistant and the other by surgeon. The traction sutures are used to enlarge subdural space to prevent damaging brain when opening dura. Touch dura with knife gently in between tractions and cut slowly layer by layer. Cutting doesn't have to be long. ~5mm will be fine. If you cut through dura, you will see transparent liquid (spinal fluid) comes out. But if you don't see the leakage, it is still on the way.  
 
|-
 
|-
|[[File:Fig15.jpg|400px]] || Cut Bensheet in triangle shape and soak in saline. Inset the sheet into the dura hole gently. This will make safe working space for extending dura incision.
+
|[[File:Fig15.jpg|400px]] || Cut Bensheet in triangle shape and soak in saline. Insert the sheet into the dura hole gently. This will make safe working space for extending dura incision.
 
|-
 
|-
|[[File:Fig16.jpg|400px]] || (figure 16)
+
|[[File:Fig16.jpg|400px]] || Cut dura with scissors. When cutting area moves, the sheet has to move together. Incision has to be always made above the sheet to protect brain. Don't cut too close to bone edge, it will make a difficulty when suturing.
 
|-
 
|-
|[[File:Fig17.jpg|400px]] || (figure 17)
+
|[[File:Fig17.jpg|400px]] || Brain is exposed.
 
|-
 
|-
|[[File:Fig18.jpg|400px]] || (figure 18)
+
|[[File:Fig18.jpg|400px]] || Insert ECoG array into subdural space. Use flat head forceps to hold the array.
 
|-
 
|-
|[[File:Fig19.jpg|400px]] || (figure 19)
+
|[[File:Fig19.jpg|400px]] || Place reference electrode in subdural space (between ECoG sheet and dura) and ground electrode in epidural space (between dura and skull).
 
|-
 
|-
|[[File:Fig20.jpg|400px]] ||  (figure 20)
+
|[[File:Fig20.jpg|400px]] || Cut artificial dura that fits to the size of dura opening. Insert artificial dura in subdural space. Rim of the artificial dura has to be covered by dura. Put sutures(PBS: a thread made of biodegradable plastic) at corners.
 
|-
 
|-
|[[File:Fig21.jpg|400px]] || (figure 21)
+
|[[File:Fig21.jpg|400px]] || Each rim is sutured by uninterrupted suture.
 
|-
 
|-
|[[File:Fig22.jpg|400px]] || (figure 22)
+
|[[File:Fig22.jpg|400px]] || Wrap a hole where wires are coming out from subdural space with small piece of fascia and suture it to dura securely for preventing spinal fluid leakage.
 
|-
 
|-
 
|[[File:Fig23.jpg|400px]] ||  (figure 23)
 
|[[File:Fig23.jpg|400px]] ||  (figure 23)

Revision as of 09:27, 14 August 2011

Fig 1.jpg Anesthetize a monkey and fix the head on stereotaxic. Attach all of electrode for monitoring vital signal during surgery. Disinfect all of surgical area and cover the area with sterilized drapes.
Fig 02.jpg Incise a skin with a cautery knife. The galea aponeurotica is cut at the center and gently peeled off from skull with the knife.
Fig 03.jpg The galea aponeurotica and temporal muscle are removed from skull with scraper until all of surgical area is exposed. Tissues on skull surface have to be wiped out and all of bleeding has to be completely stopped.
Fig 04.jpg Edge of the skin and the muscles are wrapped with moistened gauze. The gauze has to be kept moistened during the surgery.Traction sutures are put at skin edge under the gauze and the suture is pulled out to ensure a sufficient working space. Drawing a planned area of craniotomy on the skull with a pencil. Circle is where burr hole will be put and lines are where craniotome will cut the skull.
Fig 05.jpg Titanium screws are implanted as an anchor for fixing a connector on the skull. This can be done after completing ECoG implantation, but it might be safer to do before craniotomy.
Fig 06.jpg Burr holes are made with a perforator. The perforator has to be placed perpendicular to the bone surface and should not stop or pull out until the drill stops. It stops automatically when it penetrates the bone. During drilling the bone, drop a saline at the hole with syringe for cooling and washing out drilled bone.
Fig07.jpg At the bottom of burr hole, there is a very thin bone flap left. Remove the flap carefully with curette.
Fig08.jpg Confirm no bone flap is left and dura has to be fully exposed under burr hole. Gently peel off dura from skull and make epidural space around burr hole. This has to be done in all burr hole.
Fig09.jpg Epidural spaces between burr holes are connected. This tunnel will be a working space for Craniotome. Make sure all of epidural spaces underneath lines of bone incision are connected.
Fig10.jpg Craniotome is cutting bone on the line. It starts from one hole to the next hole. At the hole where Craniotome is heading, suction tube is pushing dura down to make sufficient working space. Assistant is dropping saline at the cutting edge.
Fig11.jpg Craniotome successfully cut the bone all the way around. At this point, the bone piece is still attached to dura at the center.
Fig12.jpg Removing the bone piece. The piece has to be lifted up gently from one edge and peel off dura from the piece with spurtle. This process has to be done slowly and carefully. Otherwise, it will tear dura easily.
Fig13.jpg Now dura is exposed. Wash the area and remove bone tips and stop bleeding if there is. Before cutting dura, put two traction sutures with 4-0 silk. The needle should not penetrate dura but scoop it at 2/3 depth of dura's thickness.
Fig14.jpg Elevate dura with traction sutures. One suture is held by assistant and the other by surgeon. The traction sutures are used to enlarge subdural space to prevent damaging brain when opening dura. Touch dura with knife gently in between tractions and cut slowly layer by layer. Cutting doesn't have to be long. ~5mm will be fine. If you cut through dura, you will see transparent liquid (spinal fluid) comes out. But if you don't see the leakage, it is still on the way.
Fig15.jpg Cut Bensheet in triangle shape and soak in saline. Insert the sheet into the dura hole gently. This will make safe working space for extending dura incision.
Fig16.jpg Cut dura with scissors. When cutting area moves, the sheet has to move together. Incision has to be always made above the sheet to protect brain. Don't cut too close to bone edge, it will make a difficulty when suturing.
Fig17.jpg Brain is exposed.
Fig18.jpg Insert ECoG array into subdural space. Use flat head forceps to hold the array.
Fig19.jpg Place reference electrode in subdural space (between ECoG sheet and dura) and ground electrode in epidural space (between dura and skull).
Fig20.jpg Cut artificial dura that fits to the size of dura opening. Insert artificial dura in subdural space. Rim of the artificial dura has to be covered by dura. Put sutures(PBS: a thread made of biodegradable plastic) at corners.
Fig21.jpg Each rim is sutured by uninterrupted suture.
Fig22.jpg Wrap a hole where wires are coming out from subdural space with small piece of fascia and suture it to dura securely for preventing spinal fluid leakage.
Fig23.jpg (figure 23)
Fig24.jpg (figure 24)
Fig25.jpg (figure 25)
Fig26.jpg (figure 26)
Fig27.jpg (figure 27)
Fig28.jpg (figure 28)
Fig29.jpg (figure 29)
Fig30.jpg (figure 30)

Surgical illustrations courtesy of [Juna Kurihara]