Balloon inflation device

1. A balloon inflation device comprising a syringe ( 2 ) having a syringe barrel ( 4 ) and a syringe piston ( 6 ) slidably and rotatably movable in said syringe barrel ( 4 ), the piston ( 6 ) having exterior threading ( 28 ) on at least a section of its length, the syringe barrel further comprising a retractable mechanism ( 30 ) for the retention of the piston ( 6 ) in the syringe barrel, which mechanism ( 30 ) is switchable between a retracted state in which the piston ( 6 ) is free to slide in the syringe barrel and an active state in which the free sliding of the piston ( 6 ) is impossible and in which the piston ( 6 ) can be screwed or unscrewed in the syringe barrel ( 4 ),

the device further comprising a pressure gauge ( 104 ) for measuring the output pressure of the syringe barrel ( 4 )

wherein the pressure gauge ( 104 ) is mounted movable relative to the syringe barrel ( 4 ), such that the pressure gauge rotates around a surface of the syringe barrel ( 4 ), and

wherein the device comprises a cap ( 102 ) delimiting a through-conduit ( 106 ) into which a pressure intake ( 108 ) opens, the pressure gauge ( 104 ) being connected to the output of the pressure intake, and in that the cap ( 102 ) is mounted movable in rotation around the syringe barrel ( 4 ).

2. The device according to claim 1 , wherein the device comprises an O-ring ( 23 ) arranged between the cap ( 102 ) and the syringe barrel ( 4 ).

3. The device according to claim 1 , wherein the cap ( 102 ) is elastically engaged around the syringe barrel ( 4 ).

4. The device according to claim 1 , wherein the syringe barrel ( 4 ) comprises a generally cylindrical trunk ( 8 ) extended by a neck ( 12 ) the outside diameter of which is less than that of the trunk ( 8 ), and in that the cap ( 102 ) comprises a skirt ( 114 ) engaged at least partially around the trunk ( 8 ).

5. The device according to claim 1 , wherein the device comprises end stops ( 126 ) for the pressure gauge ( 104 ) with respect to the syringe barrel ( 4 ) limiting the movement of the pressure gauge to essentially 90°.

6. The device according to claim 1 , wherein the device comprises a pressure module ( 3 ) in which the pressure gauge ( 104 ) is integrated, which pressure module ( 3 ) is mounted movable relative to the syringe barrel ( 4 ), and around the syringe barrel ( 4 ), and in that it further comprises an outlet tube ( 3 A) connected to the pressure module ( 3 ) by a rotary end cap ( 152 ) free in rotation with respect to the pressure module ( 3 ).

7. A balloon inflation device comprising a syringe ( 2 ) having a syringe barrel ( 4 ) and a syringe piston ( 6 ) slidably and rotatably movable in said syringe barrel ( 4 ), the piston ( 6 ) having exterior threading ( 28 ) on at least a section of its length, the syringe barrel further comprising a retractable mechanism ( 30 ) for the retention of the piston ( 6 ) in the syringe barrel, which mechanism ( 30 ) is switchable between a retracted state in which the piston ( 6 ) is free to slide in the syringe barrel and an active state in which the free sliding of the piston ( 6 ) is impossible and in which the piston ( 6 ) can be screwed or unscrewed in the syringe barrel ( 4 ),

the device comprising a pressure gauge ( 104 ) for measuring the output pressure of the syringe barrel ( 4 )

wherein the pressure gauge ( 104 ) is mounted movable relative to the syringe barrel ( 4 ), such that the pressure gauge rotates around a surface of the syringe barrel ( 4 ),

wherein the retractable retaining mechanism ( 30 ) comprises:

at least a half-nut ( 32 ),

at least one elastically deformable element ( 60 ), bearing on the corresponding half-nut and the on syringe barrel ( 4 ), and

at least a control member ( 66 ) for controlling the movement of the half nut, comprises at least one projection ( 70 ) bearing on the corresponding half-nut ( 32 ), fitted so as to bear, during the movement of the control member, against two surfaces ( 50 ) of the half-nut and offset from one another in a direction radial to the syringe barrel ( 4 ),

the half-nut being in its position separated from the exterior threading while the projection bears against the surface ( 50 ) radially closest to the syringe piston ( 6 ) and the half-nut being in it position of contact with the exterior threading when the projection bears against the surface ( 56 ) farthest away.

8. The device according to claim 7 , wherein:

the half-nut has a hollow body having a bottom wall which extends parallel to the syringe piston,

the bottom wall has a side directed towards the exterior of the syringe barrel, having a stepped surface bordered by two longitudinal panels,

the stepped surface comprises in succession, a first flat surface, a surface inclined outward forming a ramp, a neck projecting outward, and, set back toward the interior in relation to the top of the neck, a second flat surface, which is farther away from the axis of the syringe than the first surface.

9. The device according to claim 6 , wherein:

the device comprises a cap delimiting a through-conduit into which a pressure intake opens, the pressure gauge being connected to the output of the pressure intake, and the cap being mounted movable in rotation around the syringe barrel,

the through-conduit of the cap has a counterbore having a groove,

the outlet tube comprises a flexible conduit having a first free end equipped with an end fitting rotatably mounted in the counterbore, said end fitting having a flange received in the groove to allow the axial holding of the end fitting in the through-conduit.