Intraosseous device
An intraosseous device includes 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 while 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 having a handle end mounted to the handle; and
a cannula having a hub end mounted to the hub,
the handle end of the stylet having a bent portion and the handle having a receiver for the bent portion of the stylet for non-rotatably fixing the stylet to the handle;
the hub end of the cannula having an outwardly extending flare for non-rotatably fixing the cannula to the hub;
the handle and the hub having interengagable formations for torque transmission to the stylet and the cannula for bone penetration in either clockwise or counter-clockwise rotation of the device,
the formations including a plurality of circumferentially spaced-apart handle formations that are engagable with a plurality of corresponding formations of the hub,
the plurality of hub formations include formations of differing shapes and the plurality of handle formations include formations of differing shapes and wherein, in the engaged configuration, handle formations of the same shape as hub formations are aligned,
the handle being 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,
wherein, in the aligned configuration, the handle is movable axially for interlocking the handle formations with the hub formations, and
wherein, in the interlocked configuration, a tip of the stylet extends from a distal end of the cannula and a beveled edge of the stylet is aligned with a beveled edge of the cannula.
2. The intraosseous device as claimed in claim 1 , 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.
3. The intraosseous device as claimed in claim 2 , wherein the set number is one.
4. The intraosseous device as claimed in claim 2 , wherein the set number is two and the engagement configurations are at 180° to each other.
5. The intraosseous device as claimed in claim 1 , wherein the formations are of generally polygonal shape.
6. The intraosseous device as claimed in claim 1 , wherein the formations include at least one dovetail formation of the handle which in the engaged configuration is engaged with a corresponding dovetail formation of the hub.
7. The intraosseous device as claimed in claim 6 , wherein the handle includes a pair of dovetail formations which are diametrically opposed.
8. The intraosseous device as claimed in claim 7 , wherein the handle includes two pairs of dovetail formations.
9. The intraosseous device as claimed in claim 1 , wherein the hub comprises a luer connector which is exposed on removal of the handle.
10. The intraosseous device as claimed in claim 1 , wherein the formations include ribs and corresponding recesses.
11. The intraosseous device as claimed in claim 1 , wherein the bent portion of the stylet extends at an angle of from 10° to 30° to a longitudinal axis of a main body of the stylet.
12. The intraosseous device as claimed in claim 11 , wherein the bent portion of the stylet extends at an angle of about 20° to the longitudinal axis of the stylet.
13. The intraosseous device as claimed in claim 1 , wherein the bent portion of the stylet has a roughened surface.
14. The intraosseous device as claimed in claim 1 , wherein the hub end of the cannula includes a split flare.
15. The intraosseous device as claimed in claim 1 , wherein the hub end of the cannula has a roughened surface.
16. The intraosseous device as claimed in claim 1 , wherein the hub includes a circumferential flange part.
17. The intraosseous device as claimed in claim 16 , wherein the flange part has cut-away regions to facilitate finger engagement with the hub.
18. The intraosseous device as claimed in claim 1 , wherein the handle is configured for connection to a powered driver for torque transmission.
19. The intraosseous device as claimed in claim 18 , wherein the handle includes formations for interengagement with corresponding formations of the powered driver.
20. The intraosseous device as claimed in claim 19 , wherein the handle formations include a plurality of circumferentially spaced-apart formations that engage with a plurality of corresponding formations of the powered driver.
21. The intraosseous device as claimed in claim 20 , wherein the handle has a central formation for engaging with a corresponding central formation of the powered driver.
22. A system comprising an intraosseous device as claimed in claim 1 and a powered driver which is adapted for releasable connection to the handle.
23. An intraosseous system comprising an intraosseous device as claimed in claim 1 , and a stabilizer for stabilising the device, in situ.
24. The intraosseous system as claimed in claim 23 , wherein the stabilizer includes mounting features for engaging the stabilizer with the intraosseous device, the stabilizer including side wings for mounting to the skin of a patient, the stabilizer includes a pair of half cylindrical elements which are hinged together on one side and which have a locking system for interlocking parts on an opposite side, the side wings extending outwardly from each of the half cylindrical elements, and the stabilizer includes cushioning to engage with the hub at different locations and/or orientations of the hub.