Intraosseous device

Abstract

An intraosseous device comprises a stylet with a pointed end for penetrating bone and a cannula through which the stylet extends. The stylet has a bent portion which is engaged in a receiver in a handle cover. The cannula has an outwardly extending flare which is engaged in a corresponding seat in a hub. The handle and the hub have formations which interlock with one another when the tip of the stylet is aligned with the tip of the cannula. The interlock formations further assist torque transmission. The configuration ensures that the maximum manual torque can be applied to penetrate bone whilst ensuring that the stylet and cannula are aligned for maximum cutting efficiency and remain fixed to the handle and the hub respectively.

1 . An intraosseous device comprising:—
 a handle; 
 a hub which is releasably mounted to the handle; 
 a stylet mounted to and extending from the handle; 
 a cannula mounted to and extending from the hub; 
 
       wherein the handle and the hub have interengagable formations for torque transmission to the stylet and the cannula for bone penetration on either clockwise or anticlockwise rotation of the device. 
     
     
         2 . An intraosseous device as claimed in  claim 1  wherein the formations comprise a plurality of circumferentially spaced-apart handle formations that are engagable with a plurality of corresponding formations of the hub. 
     
     
         3 . An intraosseous device as claimed in  claim 1  wherein the handle formations and the hub formations comprise interlock formations. 
     
     
         4 . An intraosseous device as claimed in  claim 1  wherein the handle is rotatable relative to the hub from a disengaged configuration in which the handle formations are not aligned with the hub formations to an aligned configuration in which the handle formations are aligned with the hub formations. 
     
     
         5 . An intraosseous device as claimed in  claim 4  wherein, in the aligned configuration, the handle is movable axially for interlocking the handle formations with the hub formations. 
     
     
         6 . An intraosseous device as claimed in  claim 5  wherein, in the interlocked configuration, a tip of the stylet extends from a distal end of the cannula. 
     
     
         7 . An intraosseous device as claimed in  claim 6  wherein, in the interlocked configuration, a bevelled edge of the stylet is aligned with a bevelled edge of the cannula. 
     
     
         8 . An intraosseous device as claimed in  claim 1  wherein the plurality of hub formations comprise formations of differing shapes and the plurality of handle formations comprise formations of differing shapes and wherein, in the engaged configuration, handle formations of the same shape as formation of the hub are aligned. 
     
     
         9 . An intraosseous device as claimed in  claim 4  wherein the handle formations and the hub formations are engagable only in a set number of engagement configurations of the handle relative to the hub. 
     
     
         10 . An intraosseous device as claimed in  claim 9  wherein the set number is two and the engagement configuration are at 180° to each other. 
     
     
         11 . An intraosseous device as claimed in  claim 1  wherein the formations comprise ribs and corresponding recesses. 
     
     
         12 . An intraosseous device as claimed in  claim 1  wherein the formations are of generally polygonal shape. 
     
     
         13 . An intraosseous device as claimed in  claim 1  wherein the formations comprise at least one dovetail formation of the handle which in the engaged configuration is engaged with a corresponding dovetail formation of the hub. 
     
     
         14 . An intraosseous device as claimed in  claim 13  wherein the handle comprises a pair of dovetail formations which are diametrically opposed. 
     
     
         15 . An intraosseous device as claimed in  claim 14  wherein the handle comprises two pairs of dovetail formations. 
     
     
         16 . An intraosseous device as claimed in  claim 1  wherein the handle is configured for connection to a powered driver for torque transmission. 
     
     
         17 . An intraosseous system comprising a device as claimed in  claim 1  and a stabiliser for stabilising the device, in situ. 
     
     
         18 . A system as claimed in  claim 17  wherein the stabiliser comprises side wings for mounting to the skin of a patient. 
     
     
         19 . A system as claimed in  claim 17  wherein the stabiliser comprises a pair of half cylindrical elements which are hinged together on one side and which have a locking system for interlocking the parts on an opposite side, and wherein a side wing extends outwardly from each of the half cylindrical elements. 
     
     
         20 . A system as claimed in  claim 17  wherein the stabiliser comprises cushioning to engage with the hub at different locations and/or orientations of the hub.