CANNULAE FOR EVACUATING SALIVA AND/OR BLOOD FLOW

Abstract

Embodiments include an apparatus for use in the dental field including a cannula, the cannula including, a first hollow tubular branch, a second hollow tubular branch, a hollow tubular arcuate portion connecting the first hollow tubular branch and the second hollow tubular branch, a first hollow tubular member, a second hollow tubular member forming an elbowed portion, at least one first aperture formed on a relief feature of the first hollow tubular branch, at least one second aperture formed on the second hollow tubular member.

Claims

1. A dental apparatus comprising: a cannula, the cannula including: a) a first hollow tubular branch, b) a second hollow tubular branch, c) a hollow portion connecting the first hollow tubular branch and the second hollow tubular branch, d) a first hollow tubular member into which a free end of the first hollow tubular branch opens, e) a second hollow tubular member into which a free end of the second hollow tubular branch opens, f) a relief feature on the first hollow tubular branch, the relief feature being a stud projecting laterally from the first hollow tubular branch, wherein at least one first aperture is formed in the stud, and g) at least one second aperture formed on the second hollow tubular member, wherein the at least one first aperture and the at least one second aperture are configured to be engaged by each one of active ends of a clamping forceps for positioning of the cannula.

2. The dental apparatus of claim 1 wherein the at least one first aperture is more proximate the hollow portion than the at least one second aperture.

3. The dental apparatus of claim 1, wherein a first length of the first hollow tubular branch and a second length of the second hollow tubular branch are substantially equal.

4. The dental apparatus of claim 1, wherein the first hollow tubular branch is longer than the second hollow tubular branch.

5. The dental apparatus of claim 1, wherein the first hollow tubular member comprises one or more suction holes arranged on a surface of the first hollow tubular member.

6. The dental apparatus of claim 1, wherein the second hollow tubular member comprises one or more suction holes arranged on a surface of the second hollow tubular member.

7. The dental apparatus of claim 1, wherein a steel wire is embedded over the cannula.

8. The dental apparatus of claim 1, wherein the cannula is formed of a plastic material.

9. The dental apparatus of claim 1, wherein the cannula has a diameter of from about 3 mm to about 6 mm.

10. The dental apparatus of claim 1, wherein the hollow portion has a substantially U-shaped configuration.

11. The dental apparatus of claim 1, wherein the first hollow tubular member includes a plurality of suction holes in a staggered relationship.

12. The dental apparatus of claim 11, wherein each of the plurality of suction holes has a diameter of about 1 mm.

13. The dental apparatus of claim 1, wherein the second hollow tubular member includes a plurality of suction holes in a staggered relationship.

14. The dental apparatus of claim 13, wherein each of the plurality of suction holes has a diameter of about 1 mm.

15. The dental apparatus of claim 1, further comprising a suction pipe selectively coupled with the second hollow tubular member.

16. The dental apparatus of claim 1, wherein the cannula is disposable.

17. The dental apparatus of claim 1, further comprising clamp forceps selectively coupled with the cannula.

18. The dental apparatus of claim 1, wherein the first hollow tubular member defines a first orifice and a second orifice, wherein the first orifice is substantially coaxial with the second orifice.

19. A dental apparatus comprising: a cannula, the cannula including; a) a first branch, b) a second branch, c) a portion connecting the first branch and the second branch, d) a first member into which a free end of the first branch opens, e) a second member into which a free end of the second branch opens, f) a relief feature on the first branch, the relief feature being a stud projecting laterally from the first branch, wherein at least one first aperture is formed in the stud, and g) at least one second aperture formed on the second member, wherein the at least one first aperture and the at least one second aperture are configured to be engaged by each one of active ends of a clamping forceps for positioning of the cannula.

20. The dental apparatus of claim 19, further comprising further comprising clamp forceps selectively coupled with the cannula.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a diagrammatic view of an example of a cannula according to one embodiment.

[0025] FIG. 2 is a diagrammatic view of the cannula of FIG. 1 positioned in the mouth of a patient.

[0026] FIG. 3 shows the arrangement of the clamp forceps the active ends of which are inserted into first and second apertures to allow the dentist to place the cannula on the dental arch (or withdraw it).

TAILED DESCRIPTION OF A PREFERRED EMBODIMENT

[0027] The cannula 10 illustrated in FIG. 1 is a cannula or tube for evacuating saliva and/or blood flow and is intended to be used on a patient undergoing dental treatment.

[0028] The cannula 10 is formed of three tubular conduits, namely a first hollow tubular branch 14, a second hollow tubular branch 16 and a hollow arcuate tubular part 12 connecting the two branches. These three conduits form the cannula 10 having the general shape of a yoke or an inverted U. The cross-section of the cannula 10 may be circular or oval and have a diameter of about 3 mm to 6 mm.

[0029] The arcuate shape of the cannula 10 as well as the presence of the first branch 14 enable the cannula 10 to be placed directly on the dental arch and to be maintained in position without it being held.

[0030] The first branch 14 of the cannula 10 terminates in a tubular member 22 formed of two portions situated on either side of the end of the first branch.

[0031] The tubular member 22 includes one or more suction holes 28 arranged on the upper surface of the tubular member 22, for example in staggered rows, to increase the efficiency of flow evacuation. For example, the suction holes 28 with a diameter of 1 mm may be staggered every 5 mm. Such a value is also a good compromise between ensuring the strength of the cannula 10 and efficiency of flow evacuation.

[0032] The second branch 16 of the cannula 10 has an end for connection to suction means. Such suction means may consist of a suction pipe 20. Suction pipe 20 is in general a transparent pipe. The pipe 20 is used to transmit a suction force used to suck saliva and/or blood flow and treatment fluids used during the dental procedure.

[0033] The cannula includes two apertures 34 and 36. The first of these apertures is a through hole 34 formed on a plate or stud 35 supported on the first branch 14 by buttressing means.

[0034] At least one second aperture 36 is formed on the upper face of the second hollow tubular member 26 which forms an elbow with the second branch 16, the distal end of the second hollow tubular member opening into the suction means 20. This second aperture 36 is located at a lower level than the level of the first aperture provided in the first branch 14. In other words, the first aperture can be located at a level closer to the top of the arched tubular portion 12 than the second aperture. The first branch 14 is, in the case shown, longer than the second branch 16.

[0035] The tubular member 26 includes one or more suction holes 28 arranged on its upper surface, for example in staggered rows, to increase the efficiency of flow evacuation. For example, the suction holes 28 with a diameter of 1 mm may be staggered every 5 mm. Such a value is also a good compromise between ensuring the strength of the cannula 10 and evacuation efficiency of the flow.

[0036] The second aperture 36 is in itself a suction orifice, and it is possible for two or more orifices similar to aperture 36 to be formed on the upper face of the second tubular member 26 forming an elbow with the second branch 16. Preferably, however, a single aperture 36 is disposed on the upper portion of the second tubular member 26 and suction holes 28 (not shown) are also provided there.

[0037] The cannula 10 may be made of any material that is sufficiently rigid and non-toxic to the soft tissue of the patient's mouth. Materials such as a metal (stainless steel, chrome plated brass) or a plastics or synthetic material (polyethylene, polyester, and polypropylene) can be used. The cannula 10 may in particular be made of plastics material. This will impart sufficient elasticity to the cannula 10 so that cannula 10 can be adapted to the patient's morphology. The cannula 10 can adapt to all possible anatomical cases. Furthermore, the plastics material allows manufacture by injection molding of cannulae for a moderate manufacturing cost. It then becomes possible to employ single-use cannulae 10 that are disposable. Discarding cannulae 10 after use avoids the sterilization step of cannula 10. In the case of a disposable cannula 10, it is even more advantageous for environmental purposes to employ recyclable plastics materials such as polyethylene or a cannula of biodegradable materials.

[0038] The cannula 10 can further comprise a steel wire embedded over the entire length of the tubular conduit forming the cannula. The steel wire is flexible thereby conferring the best possible matching of cannula 10 to the patient's anatomy.

[0039] As shown in FIG. 2 which illustrates the positioning of the cannula of FIG. 1 in the mouth of a patient, the first branch 14 of the cannula 10 is inserted between the patient's teeth 30 and tongue 32. The second branch 16 is inserted between the patient's teeth 30 and cheek (not shown in FIG. 2). The cannula is consequently well positioned on the dental arch in a straddling or spanning position. FIG. 2 shows the cannula positioned at the lower left side of the jaw, but of course a cannula exhibiting mirror-image symmetry can be positioned on the right side.

[0040] The end of the first branch 14 of the cannula 10 terminates in a tubular member 22 formed of two parts. This tubular member 22 is intended to rest on the floor of the mouth of the patient. As can be seen in FIG. 2, the lower surface of the tubular member 22 which rests on the floor of the mouth has no suction orifices. The surface where cannula 10 rests is treated to avoid any risk of injury (piezo-trauma) and increase patient comfort. According to the example of FIG. 1, the axis of the tubular member 22 is orthogonal to the axis of the first branch 14 of cannula 10. This further improves retention of the cannula 10 in the patient's oral cavity. The tubular member 22 may however have a slight inclination with respect to a position perpendicular to the first branch 14 without this falling outside the ambit of contemplated embodiments. The tubular member 22 comprises, at least at one of its ends, preferably only at one of its ends, a suction orifice 24 for drawing off irrigation fluids and the patient's blood and/or salivary flow. Such a position avoids suction phenomenon which can cause discomfort, pain and/or create irritation or injury or damage to the floor of the mouth by simple piezo-trauma. In addition, leaving orifice 24 well clear avoids reducing the suction effect.

[0041] The orifice or orifices 24 may have a diameter of between 1 mm and 3 mm. Such values are a good compromise for a cannula 10 which is sufficiently strong and evacuates salivary flow and/or blood efficiently. When orifice 24 is too small, evacuation flow is inefficient; but, if the orifice 24 is too large, the strength and retention of cannula 10 are no longer guaranteed.

[0042] In the case of FIG. 1, the cannula 10 has two orifices 24, one at each end of the tubular member 22. Orifices 24 have a diameter of 1.5 mm. The advantage of this configuration is that the suction may be done in two opposite directions, which increases the efficiency of flow evacuation in the oral cavity.

[0043] Regarding the cannula shown in FIG. 1, the second branch 16 of the cannula 10 opens into the tubular member 26, which forms an elbow with the second branch 16 and the distal end of which is used to connect the cannula 10 to the suction means, which in the case shown are a suction pipe 20. The shape of the tubular member 26 and in particular its diameter are selected in accordance with the diameter of the suction pipe 20 to which the cannula 10 is connected.

[0044] The axis of tubular member 26 may extend in a direction substantially parallel to the axis of the tubular member 22 of the first branch. The suction pipe 20 connected to the tubular member 26 may then run parallel to the vestibule of the mouth up to the labial commissure to run outside the oral cavity. Such a configuration is consequently more ergonomic. Furthermore, support for cannula 10 is further improved. Suction pipe 20 can then descend towards the lateral face of the neck of the patient to the submandibular region. Suction pipe 20 can then be connected to a suction source allowing the flow to be drawn off through the orifice or orifices 24 of the cannula 10.

[0045] FIG. 3 shows clamp forceps 37 in a position for cannula placement on the dental arch. The active ends 38 and 38 of the clamp forceps are introduced into the special apertures 36 and 34. The practitioner then introduces the cannula into the patient's mouth and places it on the dental arch so that the branches 14 and 16 (FIG. 2) are at either side of the arch, the cannula being astride the arch between the teeth and the cheek of the patient, one of the hollow tubular members resting on the floor of the mouth and the other in the jugal trough of the patient. Upon removing the active ends from the apertures 36 and 34, clamping of the cannula on the dental arch occurs. The cannula is thus held securely in place with greater stability thereby preventing movement of the cannula during the dental procedure. By the term active ends of the clamp forceps we mean those ends which are at the opposing end to the means 39 by which the clamp forceps are grasped.

[0046] The embodiments described above and the drawings should be considered as illustrative and not limiting, and the invention is not intended to be limited to the details given herein but may be modified within the scope of the appended claims.