... I think - and there's a couple of hits in Google:
http://www.ssat.com/cgi-bin/97ddw/ddw86.cgi?affiliation=:
There were fewer episodes of intra-operative trocar site bleeding in group R (3 vs. 20, p<0.001). Other complications were similar in the two groups.

http://www.urologytimes.com/urologytimes/article/articleDeta...
However, such a device could be cumbersome in the limited working space available during complex minimally invasive procedures and would require an additional large working trocar.


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Note added at 4 hrs 32 mins (2004-03-14 23:27:20 GMT)
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http://www.inletmedical.com/koh_closesure_pubs.asp:
Therefore, fascial closure requires the removal of the operative trocar and insertion as in the case of the Carter/Thomason device of a plug to prevent loss of pneumoperitoneum.

http://www.obgyn.net/displaytranscript.asp?page=/avtranscrip...
That was the first thing. Of course, it was a little bit frustrating that if we saw minor adhesions or endometriosis that we couldn’t treat that but this changed so we now also have an operative trocar so we can enlarge the diagnostic trocar to an operative trocar, and through this trocar we can now insert instruments for doing coagulation, laser coagulation, scissors, and a biopsy needle.

http://endoscopia.com.mx/Especialidades/Laparoscopia/Davol/I...
IRS Instrument Insert Probe
(Inserts through any 1 Omm trocar to accommodate all 5mm operative Instruments)
* 10mm/30cm nonconductive Probe accommodates 5mm laparoscopic Instruments Inserts (shears, graspers, electrodes) through operative trocar
· Allows instantaneous suction/irrigation capability and continuous smoke evacuation
· Full working length of Instrument Inserts is retained
· Available soon with Electroshield, technology to monitor against electrosurgical hazards

www.medscape.com/viewarticle/439593_2:
The sheath expands as the actual working trocar is placed through it and helps keep the stomach from slipping off the trocar during the operation.