Why “double ring” causes confusion
The phrase “double ring” is easy to misread. In the HK-FDDC-4FX model, it means the supplied set offers two ring sizes to choose from, not that both optional support rings should be placed in one patient. The small ring is approximately 4.0 cm in diameter; the large ring is approximately 4.7 cm. The clinician selects one according to the planned access and patient anatomy, following the current model-specific instructions and local protocol.
There is a second, separate naming issue: a wound retractor already has a blue internal ring and a white external ring. These are not the same as the two alternative loose support rings in the 4FX set. Distinguishing these components in demonstrations and quotations prevents a surprisingly common setup misunderstanding.
What changes with the balloon configuration?
HK-FDDC-4TNOS uses a long white support sleeve as the base support component. A separate blue balloon is available for the setup when additional support is selected. “Balloon configuration” does not mean the balloon must always be inflated, nor does it change the basic requirement to select components and use them according to the current approved model-specific IFU.
The support ring and balloon are different architectures for the same broad access question: how to maintain an appropriate transvaginal working passage for the selected approach. A simple demonstration analogy is a sized frame versus a sleeve with an adjustable support cuff; it is an explanation of components, not a claim of equivalent clinical performance or an instruction for placement.
Which specifications do the models share?
| Selection point | HK-FDDC-4FX | HK-FDDC-4TNOS |
|---|---|---|
| Support arrangement | Two alternative ring sizes supplied; select one | Long white sleeve; separate optional balloon |
| Port diameter | D60 = 60 mm port diameter | D60 = 60 mm port diameter |
| Instrument channels | Four: 2 × nominal 10 mm + 2 × nominal 5 mm | Four: 2 × nominal 10 mm + 2 × nominal 5 mm |
| Quotation question | Which ring size and exact kit? | Is the balloon-support component part of the requested kit and setup? |
Port diameter, working-channel size and any companion wound-retractor or sleeve dimensions are different measurements. Do not infer one from the other. Confirm the exact item number, supplied components, instrument fit and target-market documents before issuing a quotation.
How should a distributor guide the choice?
- Confirm that the intended route is transvaginal vNOTES access rather than transanal TaTME or a conventional abdominal single-port route.
- Ask which support arrangement the surgeon prefers: selection from two ring sizes or a long white sleeve with an optional balloon.
- Confirm the four-channel plan and compatible instruments against the approved IFU.
- Record the exact model code, packaging contents, market, labeling and controlled documentation requested.
At present, we describe the distinction as configuration and surgeon preference. We do not claim that either architecture prevents displacement, improves surgical outcomes, or is generally superior. Those would require model-specific comparative evidence.
Frequently asked questions
Are both HK-FDDC-4FX support rings inserted together?
No. The two supplied sizes are alternatives. Select one appropriate ring for a given setup.
Does HK-FDDC-4TNOS always need the balloon?
No. The white support sleeve is the base component, and the separate balloon is optional when selected for the setup.
What does D60 mean?
It denotes a 60 mm port diameter, not the diameter of the support ring, sleeve or surgical incision.
Is one model more effective or more secure?
This article makes no head-to-head superiority claim. Confirm the surgeon's preferred setup and the exact approved documentation.
Product and source pathway
- AeroMed vNOTES / TaTME model page — photographs and current product scope.
- Single-Port Access portfolio — route-level product navigation.
- Earlier vNOTES access selection note — broad documentation questions; use this page for corrected model-specific support architecture.
- International consensus on safe implementation of vNOTES — clinical-context literature, not evidence for these particular AeroMed models.