Cannula

• US 20080228192A1
• Filed: 08/30/2006
• Published: 09/18/2008
• Est. Priority Date: 09/28/2005
• Status: Abandoned Application

• Current Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Original Assignee: Disc-O-Tech Medical Technologies Limited (Medtronic Plc)
• Inventors: Beyar, Mordechay, Globerman, Oren
• Application Number:
  US11/468,421
• Publication Number:
  US 20080228192A1
• Time in Patent Office: Days
• US Class Current: 606/94
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 17/8811 characterised by the introducer tip, i.e. the part inserted into or onto the bone
• CPC Class Codes: A61B 17/8816 characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
• CPC Class Codes: A61B 17/8822 characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw pump plunger, hydraulic force transmissions, application of vibrations or a vacuum
• CPC Class Codes: A61B 17/8836 for heating, cooling or curing of bone cement or fluid fillers
• CPC Class Codes: A61B 2017/00539 hydraulically
• CPC Class Codes: A61B 2017/2905 flexible
• CPC Class Codes: A61B 2090/3937 Visible markers
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/4601 for introducing bone substitute, for implanting bone graft implants or for compacting them in the bone cavity
• CPC Class Codes: A61F 2002/4693 hydraulic
• CPC Class Codes: A61L 24/043 Mixtures of macromolecular materials
• CPC Class Codes: A61L 24/06 obtained by reactions only involving carbon-to-carbon unsaturated bonds A61L24/043, A61L24/046 take precedence
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 2430/38 for reconstruction of the spine, vertebrae or intervertebral discs
• CPC Class Codes: A61L 27/26 Mixtures of macromolecular compounds
• CPC Class Codes: B01F 27/95 with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
• CPC Class Codes: B01F 35/3202 Hand driven
• CPC Class Codes: B01F 35/53 : characterised by the configuration of the interior, e.g. baffles for facilitating the mixing of components
• CPC Class Codes: B01F 35/75425 : using pistons or plungers
• CPC Class Codes: B01F 35/754251 : reciprocating in the mixing receptacle
• CPC Class Codes: C08L 33/12 : Homopolymers or copolymers of methyl methacrylate

Abstract

A bone cement cannula, the cannula comprising: a tube including a section adapted for plastic deformation; and a lumen in the tube capable of resisting forces of a viscous material propelled therethough at a pressure of at least 100 atmospheres.

Claims

1. A bone cement cannula, the cannula comprising:

(a) a tube including a section adapted for plastic deformation; and

(b) a lumen in the tube capable of resisting forces of a viscous material propelled therethough at a pressure of at least 100 atmospheres.

2. A cannula according to claim 1, wherein said section adapted for plastic deformation comprises a series of separate joints formed in an outer wall of the cannula.

3. A cannula according to claim 2, wherein at least one of said joints is formed by at least one cut.

4. A cannula according to claim 3, wherein at least one of said cuts is configured to close as the cannula deforms.

5. A cannula according to claim 2, wherein at least one of said joints is formed by non-penetrating weakening of the cannula wall.

6. A cannula according to claim 2, wherein said joints facilitate a desired deformation configuration of the cannula.

7. A cannula according to claim 2, wherein said joints are sealed.

8. A cannula according to claim 1, comprising an outer sealing layer.

9. A cannula according to claim 1, comprising an inner sealing layer.

10. A cannula according to claim 1, wherein said section is adapted to remain outside of a body.

11. A cannula according to claim 1, wherein said section adapted for plastic deformation comprises a deformable sleeve.

12. A cannula according to claim 1, wherein said section adapted for plastic deformation comprises a flexible tube and a configuration support for said tube.

13. A cannula, comprising:

(a) a tube including a section adapted for plastic deformation; and

(b) a lumen in the tube, said lumen at least partially filled with a bone filling material.

14. A bone cement cannula, the cannula comprising:

(a) a tube including a tube lumen providing a channel of fluid communication between at least one injection aperture and a connector body; and

(b) at least two inlet ports defined in said tube.

15. A cannula according to claim 14, wherein one of said ports is axially oriented.

16. A cannula according to claim 14, wherein at least one of said ports is trans-axially oriented.

17. A cannula according to claim 14, including a port path selector adapted to selectively allow flow from one of said ports.

18. A cannula according to claim 14, including a port path blocker adapted to selectively allow block back-flow out of one of said ports.

19. A manufacturing process for a surgical tool, the method comprising:

(a) determining a pattern of cuts which will impart a desired deformability to a work piece;

(b) imparting the desired plastic deformability to the work piece by incising the pattern of cuts therein to produce a surgical tool; and

(c) forming said work piece into a cannula suitable for bone cement injection.

20. A method of delivering cement, comprising:

(a) providing a cannula with an axial guide-wire exiting through an axial hole thereof and said cannula including a side exit port;

(b) inserting said cannula into a bone;

(c) removing said guide-wire; and

(d) injecting cement through said cannula such that less than 20% of the cement exits through the axial hole.

21. A method of injecting a viscous material into a patient, comprising:

(a) inserting a cannula into a patient;

(b) bending said cannula over a length of at least 20 mm; and

(c) injecting a viscous material through said cannula.