A pneumo-needle and trocar assembly is a common surgical tool. The trocar and cannula have a range of diameters from five to twelve millimeters. A cannula tube has a seal that prevents leakage of inflation gases when the trocar is removed and the endoscopic instruments are inserted through it. A stabilizer is a separate device that contains graduations for controlled depth penetration and interacts with an abdominal lock. The interaction between these two components gives the system greater stability and engagement.
A trocar assembly 10 includes two principal subassemblies: obturator assembly 100 and cannula assembly 1000. The obturator shield 106 has a locking mechanism that prevents proximal movement of the cannula assembly. The locking mechanism consists of a latch member 180, a web 186, and a pair of biasing posts 188.
A trocar assembly includes a cannula, an obturator, and a cap. The obturator assembly is partially positionable inside the cannula. A safety shield is typically included. The mechanism controls the relative movement of the obturator blade. The mechanism is disclosed in U.S. Pat. No. 6,319,266 by Stellon et al.
The broader housing of a trocar sleeve can be used to house a magnetic flap valve to keep abdominal gas contained. This arrangement is effective in preventing gas leakage, but practical experience has shown that the magnetic flap valves tend to lose their effectiveness after some time. So, if you need a small trocar for laparoscopic surgery, consider a Trocar with Magnetic or Cross or Spring.
The magnetic anchoring system, or MAGS, was developed by the University of Texas Southwestern Medical Center in conjunction with the Automation & Robotics Research Institute at the University of Texas at Arlington. This concept developed to a working prototype that incorporated an internal camera system. The system is designed to deploy through a 12-mm-diameter trocar. It has the potential to change the way that surgeons perform laparoscopic procedures.
The stabilizing device 39 is adjustable from 2.5 to seven centimeters. It is set to four centimeters to avoid plunging effect. The device is then pushed through the abdomen. A small incision is made and a Veress cannula is inserted through it. During the procedure, the needle passes eccentrically through the trocar's cutting edge 25 and contacts the skin 80.
The MAGS camera can perform intra-abdominal surgery while presenting tissue retractor for laparoscopic surgeries. A MAGS camera has the ability to achieve comparable performance to a fixed trocar, and may even surpass its capabilities. The MAGS camera also helps reduce surgical pain. With the MAGS camera, a single-stage operation can be performed without scarring. In addition to its other benefits, the MAGS camera is designed to be an excellent tool for laparoscopic surgeries.
Another preferred embodiment of the invention is shown in FIGS. 2A-5D. The obturator 11 is offset within trocar 21 and a pneumo-needle is positioned inside of the trocar. The pneumo-needle 28 is secured into the PILOT position by a latch 27. Afterwards, the trocar is adjusted in a concentric position.
