I've found several devices for you to consider. Below are brief
excerpts from websites which describe the devices. For more info, just
click the link below each description. Most of these sites have photos
and/or drawings, and some offer testimonials from satisfied users.
You've asked specifically about cones that can be inserted into the
nose to keep the passages open. Here's a device called "Sinus Cones"
that does precisely that (after the animated intro, click on "How To"
to see photographs of the product):
Sanostec Sinus Cones
"Breathe EZ is a small device made of soft washable urethane material
that has been independently tested to ensure it meets FDA standards.
When clipped on the septum... it applies a small amount of pressure to
stimulate nerves, resulting in opening the nasal passages so you can
breathe through your nose."
"EZBreathe is made of a FDA approved rubber or pliant plastic material
and in a curved strip format. The lateral ends of the strip each have
a raised arm, and the center of the strip has a raised clip. This
center clip is for attachment to the external septum between the
nostrils. The raised arms of the lateral ends of the strips are
inserted into the nostrils. When applied, the tension of the strip
applies a pulling pressure to the raised arms at its lateral ends. As
this pressure pulls the raised arms, their contact and withdrawal
within the nasal canals open and maintain the nostrils. With the
nostrils fully open, the user can be confident in full, deep breathing
capability entirely through the nose."
"The Quiet Night nasal dialator exerts gentle outward pressure when
placed in the vestibule of the nose. This opens the nasal valve
allowing a greater flow of air."
Hood Laboratories Quiet Night
"Nose Brace, developed, patented, and manufactured in the USA, is a
device designed to gently dilate (open) the nostrils and allow
comfortable airflow through the nasal passages. It provides
immediate, effective, comfortable, and long lasting relief from
various nasal obstructions and associated symptoms (such as snoring
and sleep apnea) without medication or surgery. Nose Brace is easily
inserted in the nostril by the user, as needed, to make nasal
breathing comfortable. It is positioned such that nasal breathing is
easy and no parts of Nose Brace protrude outside of the nose. That
is, since it is worn inside the nostril, it is not readily visible."
"The area of the nose most critical for proper airflow is the place
where the sides of the nostrils meet the septum in the middle near the
front; this is the upper part of the nasal valve. The NoseWorks(TM)
nasal support acts in this area to comfortably prevent nasal collapse
when you inhale."
"Nozovent has demonstrated continual effectiveness to decrease
snoring, help breathing, and improve sleep. Nozovent gently widens
nasal passages to increase airflow up to 50%."
"The Breathe With Eez will enhance the flow of air through the nose
for a variety of ailments when easily inserted in the nostril or
nostrils... The Breathe With Eez is available in small, medium and
large. it will fit most people comfortably without adjustment...
Immediate improvement will occur for most nasal breathing
Breathe with EeZ
"Drug free relief for nasal congestion. Small re-useable clip inserted
into the nostrils opens the nasal passages to promote clearer
Breathe Fit Nasal Dilator
"While some external adhesive devices attempt to open nasal passages
from the outside by pulling the opposite sides of the nose chamber
apart, Breathe Aid works from inside the nose, comfortably pushing the
opposite sides of the nose chamber apart. Because no adhesives are
involved, Breathe Aid can also be used more than once."
Google search strategy:
Google Web Search: "nasal dilator"
Google Web Search: "open nasal passages"
Google Web Search: "nasal" + "insert" + "breathe"
Google Web Search: "open" + "nostrils" + "breathe"
I hope this helps you to breathe freely! If anything is unclear, or if
a link doesn't work for you, please request clarification; I'll be
glad to offer further assistance before you rate my answer.