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1. (WO1991017787) DRAIN, DEVICE FOR APPLYING SAID DRAIN AND METHOD FOR APPLYING A SINUS DRAIN
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CLAIMS
1. Drain comprising a flexible catheter (11), to be applied with a first end thereof in an antrum and a second end thereof being available exterior of said antrum, c h a r a c t e r i s e d in that an end section of said
catheter (11) is connected to a tube (12), the material of said tube being rigid compared to the material of said catheter.
2. Drain according to claim 1, c h a r a c t e r i s e d in that said end section of said catheter (11) surrounds an end section of said tube (12) and that said catheter (11) and said tube (12) are fixidly connected.
3. Drain according to claim 1 or 2,
c h a r a c t e r i s e d in that said tube (12) in the free end thereof is provided with radially extending wedges (40).
4. Drain according to any of claim 1-3, c h a r a c t e r i s e d in that said tube (12) in the free end thereof is provided with barbs (41) extending therefrom.
5. Device for applying a drain formed in accordance with claim 1, comprising a catheter (11), a tube (12) connected thereto and an elongated needle (13) arranged within said catheter (11) and said tube (12) for penetrating a wall of an antrum, c h a r a c t e r i s e d in
that said needle (13) is connected to a needle holder (18) movable between an inner and an outer end position in the longitudinal direction of said needle (13) and in a first hollow space (19) in a head (20), and
that a hammer (21) displaceable in a second hollow space
(22) between a rear end and a front end position by
means of a force generating means (23), is arranged
to engage said needle holder in said inner end
position thereof at a predetermined distance from
said front end position of the hammer, said needle
holder (18) and thereby said needle (13) being brought with said hammer (21) when said hammer (21)
is displaced to the forward end position thereof.

6. Drain according to claim 5, c h a r a c t e r i s e d
in
that said needle (13) comprises an point section (14)
terminated in a front part by the needlepoint (15)
and in the opposite part of said point section ( 14 ) a radially extending element ( 17 ) , and
that said element (17) extends radially over the inner
radius of said tube (12), said tube (12) engaging
said element (17) when said needle (13) has been
inserted in said catheter (11) and said tube (12) of the drain.
7. Drain according to claim 6, c h a r a c t e r i s e d
in
that said extending element (17) is constituted by an
annular shoulder extending from said edge section
(14).
8. Method for applying a drain into maxillary sinus
according to which a needle (13) is inserted in the
nose, the needlepoint (15) thereof engaging the bone within the nasal cavity and the maxillary sinus,
c h a r a c t e r i s e d
by mounting a tubular means (12) of said drain over and externally on a front position of said needle (13),
said needlepoint (15) extending over the front end of said tubular means ( 12) ,
by applying kinetic energy to said needle (13) in a
direction towards said bone between the nasal cavity and the maxillary sinus, said energy being sufficient for making said needle penetrate said bone during a
forward movement of said needle (13) generated by
said kinetic energy,
by driving said tubular member ( 12 ) along with the
movement of the needle, by stopping said movement of the needle when a
predetermined distance has been covered, said
distance being at least large enough to put the
opening of a front end of said tubular means (12)
into said maxillary sinus, and
by retracting said needle through said bone between the nasal cavity and the maxillary sinus leaving said
tubular means ( 12) .