Powder delivery device
View Patent ↗Provided is a device for the dispensing of powders of the type in which a generated gas flow entrains the powder to be dispensed and carries the powder from the device via a barrel. The barrel has a bore including a main portion with a continuous internal surface, and is characterized in that the length of the main portion is at least fifteen times its maximum internal diameter; and/or the internal bore of the main portion is tapered; and/or the barrel has an outwardly flared outlet portion.
1. A method of delivering a haemostatic composition to an internal tissue exposed during surgical procedures or after traumatic injury, the method comprising:
providing a device for the dispensing of powder, the device comprising:
a barrel comprising:
a bore including a main portion with a continuous internal surface through which a generated gas flow entrains the powder to be dispensed, and
an outwardly flared outlet portion having an internal diameter and an external diameter,
wherein:
a length of the main portion is at least fifteen times a maximum internal diameter of the bore;
the internal diameter and external diameter of the outlet portion increases from an upstream end to a downstream end of the outlet portion;
the maximum internal diameter of the main portion is from 1 mm to 6 mm; and
the device is charged with a quantity of a haemostatic composition in dry powder form, and
dispensing the composition from the device onto the tissue.
2. The method of claim 1 , wherein the internal bore of the main portion is tapered.
3. The method of claim 1 , wherein the barrel is rigid.
4. The method of claim 3 , wherein the length of the main portion of the barrel is at least eighteen times or at least twenty times the maximum internal diameter of the bore.
5. The method of 3 , wherein the length of the main portion is between about 30 mm and 100 mm.
6. The method of claim 1 , wherein the barrel is flexible.
7. The method of claim 6 , wherein the main portion of the barrel has a length of between 50 mm and 300 mm.
8. The method of claim 6 , wherein the internal diameter of the barrel is between 1 mm and 5 mm.
9. The method of claim 6 , wherein the main portion of the barrel comprises a plastic tube.
10. The method of claim 9 , wherein the barrel incorporates one or more malleable elongate members.
11. The method of claim 10 , wherein the elongate malleable members are wires or rods.
12. The method of claim 11 , wherein the wires or rods are embedded in the plastic material from which the barrel is formed.
13. The method of claim 11 , wherein the one or more elongate malleable members are one or more copper or copper-coated steel wires.
14. The method of claim 1 , wherein the internal diameter of the main portion decreases from an upstream end to a downstream end of the main portion.
15. The method of claim 1 , wherein the internal diameter of the main portion increases from an upstream end to a downstream end of the main portion.
16. The method of claim 1 , wherein the internal diameter of the main portion increases from an upstream end to a downstream end of the main portion or decreases from the upstream end to the downstream end of the main portion at a taper angle of 0.5° to 3°.
17. The method of claim 1 , wherein the outlet portion has a length of between 5 mm and 25 mm.
18. The method of claim 17 , wherein the internal diameter of the outlet portion increases from the upstream end to the downstream end by a factor of two or more.
19. The method of claim 1 , wherein the barrel is provided with a mounting that enables an orientation relative to the main portion of the device of which it forms part to be varied.
20. The method of claim 19 , wherein the mounting is a ball-and-socket connector.