Surgical head clamp
First Claim
1. A surgical head clamp comprising:
- an essentially U-shaped retaining clip with a connecting bar and a first holder arm and a second holder arm extending in a same direction in a plane of said U-shaped retaining clip at ends of said connecting bar, said first holder arm having a first arm end with a first bearing bore and said second holder arm having a second arm end with a second bearing bore having an inner wall with a smooth cylindrical surface and with two balls arranged in a diametrically opposed, axially fixed manner in said inner wall, said first bearing bore being coaxial to said second bearing bore;
a first mandrel holders mounted adjustably in said first bearing bore and pivotably fastened at a first bearing part of said first arm end, said first bearing part being adjustable around a common bearing shaft;
a second mandrel holder mounted adjustably in said second bearing bore, said second mandrel holder including a threaded spindle provided with an external thread for adjustment and an axial bore and said second mandrel holder including a guide shank provided with a socket bore on a front side, said guide shank being mounted coaxially to said common bearing shaft in a spring-mounted manner in said axial bore of said threaded spindle, said threaded spindle being adjustably mounted in said second bearing bore of said second arm end, said external thread comprising a ball thread with an arcuate-segment profile, said two balls meshing as contact elements with said arcuate-segment profile;
an adjustable locking lever connected to said U-shaped retaining clip and having a locked position, said balls being held in contact with said ball thread by means of said adjustable locking lever in the locked position thereof, and said balls being brought out of contact with said threaded spindle in another position of said locking lever in order to make said threaded spindle freely displaceable in said second bearing bore.
1 Assignment
0 Petitions
Accused Products
Abstract
A surgical head clamp is provided including an essentially U-shaped retaining clip (1) with two holder arms (3, 4), running towards the same side in the plane thereof at the ends of a connecting bar (2). The arm ends (5, 6) of the holder arms have mandrel holders (11) mounted adjustably in bearings that are coaxial to one another. The mandrel holders may be provided with one or more said holding mandrels (12), whereby a first mandrel holder is pivotably fastened at a bearing part (15) of the one arm end (6), which bearing part is adjustable around a common bearing shaft (9), and a second mandrel holder (11) can be adjusted by means of a threaded spindle (10) in a bearing bore (7) of the other said arm end (5). The second mandrel holder (11) includes a guide shank (50) that is provided with a socket bore (54) on the front side, which is mounted coaxially to the bearing shaft (9) in a spring-mounted manner in a axial bore (61) of the threaded spindle (10). The threaded spindle (10) is provided with an external thread and is adjustably mounted in a smooth cylindrical bearing bore (7) of the other arm end (3). The external thread is embodied as a ball thread (23), which has an arcuate-segment profile, with which two balls (24, 25) mesh as contact elements. The balls are arranged in a diametrically opposed, axially fixed manner in the wall (28) of the bearing bore (7) and are held in contact with the ball thread (23) by an adjustable locking lever (35) in the locked position thereof, and which can be brought out of contact with the threaded spindle (10) in another position in order to make the threaded spindle (10) freely displaceable in its said bearing bore (7).
38 Citations
12 Claims
-
1. A surgical head clamp comprising:
-
an essentially U-shaped retaining clip with a connecting bar and a first holder arm and a second holder arm extending in a same direction in a plane of said U-shaped retaining clip at ends of said connecting bar, said first holder arm having a first arm end with a first bearing bore and said second holder arm having a second arm end with a second bearing bore having an inner wall with a smooth cylindrical surface and with two balls arranged in a diametrically opposed, axially fixed manner in said inner wall, said first bearing bore being coaxial to said second bearing bore; a first mandrel holders mounted adjustably in said first bearing bore and pivotably fastened at a first bearing part of said first arm end, said first bearing part being adjustable around a common bearing shaft; a second mandrel holder mounted adjustably in said second bearing bore, said second mandrel holder including a threaded spindle provided with an external thread for adjustment and an axial bore and said second mandrel holder including a guide shank provided with a socket bore on a front side, said guide shank being mounted coaxially to said common bearing shaft in a spring-mounted manner in said axial bore of said threaded spindle, said threaded spindle being adjustably mounted in said second bearing bore of said second arm end, said external thread comprising a ball thread with an arcuate-segment profile, said two balls meshing as contact elements with said arcuate-segment profile; an adjustable locking lever connected to said U-shaped retaining clip and having a locked position, said balls being held in contact with said ball thread by means of said adjustable locking lever in the locked position thereof, and said balls being brought out of contact with said threaded spindle in another position of said locking lever in order to make said threaded spindle freely displaceable in said second bearing bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification