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Push-connection for detachable connection of two bodies, in particular pedicle screw and screwdriver

A technology of inserting mechanism and disassembling connection, which is applied in the direction of screwdriver, fixer, wrench, etc., which can solve the problems of soft tissue injury, increased equipment cost, difficult operation, etc.

Inactive Publication Date: 2008-01-23
SYNTHES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this solution is conditional on a second instrument, thereby complicating the operation and increasing the cost of the instrument
Here, the screwdriver with the screw holder requires more space, which leads to greater damage to the soft tissue

Method used

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  • Push-connection for detachable connection of two bodies, in particular pedicle screw and screwdriver
  • Push-connection for detachable connection of two bodies, in particular pedicle screw and screwdriver
  • Push-connection for detachable connection of two bodies, in particular pedicle screw and screwdriver

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Embodiment Construction

[0045] FIG. 1 shows an embodiment of the plug-in mechanism according to the invention, which has a first body 1 with a first connecting region 3 concentric to the central axis 4 and a second object also concentric to the central axis 4. The second object 2 of the connection zone 6 . The object 1 then has a front end 25 comprising a first connection region 3 with three (M=3) connection segments 5.1; 1 Extend up. The connecting region 3 forms a shaft section 21 concentric to the central axis 4 . The first connection section 5.1 with a non-circular cross-section is configured as a hexagon 22 and has a diagonal dimension E and a spanner width SW, while the first connection section 5.2, which serves as an axial non-positive connection, has a 2° Up to 10°, preferably a frusto-conical shaft section 23 with a cone angle of 3° to 5°. The frustoconical shaft section 23 follows the front end 25 and has a diameter d there. min while on the boundary of the hexagon 22 with diameter d m...

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Abstract

A plug-type connection for releasably connecting two bodies (1) and (2), A) the first body (1) comprising M (M>=1) first connection segments (5.i) arranged coaxially to a central axis (4); B) the second body (2) comprising N (N>=1) second connection segments (7.j) arranged coaxially to said central axis (4), so that C) the first connection zone (3) and the second connection zone (6) form a plug-type connection extending coaxially to said central axis (4), D) the first connection zone (3) having at least one first connection segment (5.1) with a non-circular cross-section Q5.1 and the second connection zone (6) having at least one second connection segment (7.1) with a cross-section Q7.1 in positive engagement with said cross-section Q5.1, whereby a rotationally stabilised, positive engagement relative to the central axis (4) is achievable; E) MxN being >=2; and F) at least one first connection segment (5.k) and at least one second connection segment (7.1) forming an axially non-positive engagement relative to the central axis (4).

Description

technical field [0001] The invention relates to a plug-in mechanism for detachable connection of two objects. Background technique [0002] For micro-invasive and endoscopic components of surgical instruments and implants, it is extremely important to establish a stable connection between the screw and the screwdriver. For screws with a large head size, there is no problem with a secure connection. [0003] Such a connection between a pedikel screw or a spinal hook and an operating device is disclosed in WO 94 / 26190 SCHLAEPFER. This known connection comprises, in one embodiment, a connection mechanism comprising an internally threaded hole open upwards and a slit extending perpendicular to the axis of the hole at the head of the stem screw, and an external thread mating to the internal thread. And two protrusions corresponding to the slots on the operating device. In this way a robust connection can be established for both rotation and axial movement. As another embodime...

Claims

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Application Information

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IPC IPC(8): A61B17/88A61B17/58B25B15/00B25B23/10
CPCA61B17/8888B25B15/008B25B23/108
Inventor 弗里多林·施拉普费尔马丁·黑斯
Owner SYNTHES GMBH
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