• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for producing a flushing cannula (14). A distal portion of a hollow needle (25) is machined to remove a portion of the needle wall such that a wall segment (24) forms the distal end (16) of the irrigation cannula (14). A distal portion of the wall segment (24) is heated above the melting temperature. From the molten material, a thickening (23) is formed, so that the thickening (23) forms the distal end (16) of the flushing cannula (14). The invention also relates to an associated flushing cannula (14). The irrigation cannula is adapted to flush deeper portions of a root canal of a tooth (26).
    公开号:CH710746B1
    申请号:CH00819/16
    申请日:2014-12-02
    公开日:2018-05-15
    发明作者:Fritze Joachim
    申请人:Transcodent Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Description: The invention relates to a rinsing cannula and a method for producing a rinsing cannula and a rinsing device.
    Rinsing cannulas can be used by dentists, for example, to rinse the root canal of a tooth. In a previous treatment step, impurities may have entered the root canal, which must be removed before the next treatment steps. With the irrigation cannula, the dentist introduces a liquid into the root canal so that the impurities are flushed out of the root canal. Classic cannulas, in which the liquid exits via an outlet opening on the distal end of the cannula, are usually not used for rinsing root canals because the axially emerging jet places an undesirable load on the apex of the root canal.
    A flushing cannula in the form of a hollow needle is known, the distal end of which is closed. Near the distal end, one or more lateral openings are formed in the wall of the hollow needle through which the liquid can escape in the lateral direction. In order to create the lateral openings in the hollow needle, a mechanical processing step is required, for example milling. The processing step cannot take place directly at the closed end of the hollow needle, but a distance is maintained.
    The distance between the lateral opening and the distal end of the irrigation cannula makes it difficult to rinse the deeper regions of the root canal. There is a risk that impurities remain there, which can lead to complications in the further course.
    The invention is based on the object of presenting a irrigation cannula and a method for producing a irrigation cannula with which deeper lying areas of the root canal can be irrigated. Starting from the prior art mentioned, the object is achieved with the features of the independent claims. Advantageous embodiments are specified in the dependent claims.
    In the method according to the invention, a distal section of a hollow needle is machined to remove part of the needle wall, so that a wall segment forms the distal end of the irrigation cannula. A distal section of the wall segment is then heated above the melting temperature. A thickened portion is formed from the molten material so that the thickened portion forms the distal end of the irrigation cannula.
    First, some terms are explained. A region of the irrigation cannula in which the cross-sectional area is larger than the cross-sectional area of the wall segment is referred to as thickening. The cross-sectional area is oriented perpendicular to an axis which extends from an outlet opening of the channel of the hollow needle to the thickening.
    By partially removing the needle wall in the method according to the invention, the liquid can emerge from the rinsing cannula in the lateral direction and thus act in the desired direction. However, the wall segment that remains after this processing step forms a sharp-edged distal end of the irrigation cannula. There is a risk that this sharp end cuts into the adjacent tooth substance or surrounding tissue when the irrigation cannula is positioned and leads to injuries. By heating the distal end of the wall segment, the material of the wall segment is melted and the sharp-edged shape is dissolved. If the irrigation cannula with the thickening according to the invention is inserted first into the root canal, the risk of injury is reduced.
    The thickening can be designed such that it covers at least 30%, preferably at least 50%, more preferably at least 100% of the cross-sectional area of the channel in a projection onto the outlet opening of the channel. The imaginary projection takes place along the axis of the irrigation cannula in the plane of the outlet opening. If the thickening is arranged in this way in the extension of the outlet opening of the hollow needle, it additionally contributes to redirecting the liquid in the lateral direction. In a further preferred embodiment, the thickening not only covers the cross-sectional area of the channel, but also the entire cross-sectional area spanned by the hollow needle.
    In order to keep the risk of injury when inserting the irrigation cannula low, the thickening can be shaped such that it has a rounded contour in the distal direction.
    To enable easy insertion of the irrigation cannula into a root canal, a slim design of the irrigation cannula is advantageous. The thickening can therefore be designed so that it does not protrude from the outer surface of the wall segment. More preferably, the thickening does not project over the contour spanned by the original hollow needle. If the thickening remains within the contour of the hollow needle, it can be inserted into any opening in which the hollow needle also fits.
    In the method according to the invention, the wall segment which remains after the partial removal of the needle wall is not melted over its entire length. A proximal section of the wall segment remains. The proximal section defines the area over which the liquid can escape to the side in the finished irrigation cannula. Only a distal section of the wall segment is melted, that is, a section of the wall segment adjoining the distal end.
    The wall of the hollow needle is regularly very thin, so that a longer section of the wall segment has to be melted in order to obtain a sufficient amount of material for the formation of the thickening. The wall segment
    CH 710 746 B1 can, for example, be melted over at least 20% of its length, preferably at least 30% of its length, more preferably at least 50% of its length. The length of the wall segment denotes the distance from the outlet opening of the channel to the distal end of the wall segment. The length specification refers to the state before melting.
    The wall segment, which remains after the partial removal of the wall, extends in relation to its longitudinal direction preferably parallel to the extension of the channel. In relation to the circumferential direction, the wall segment can extend, for example, over a circumferential angle between 100 ° and 260 °, preferably between 150 ° and 210 °. The wall segment should be designed so that on the one hand it is sufficiently flexible to be able to follow a curved course of a root canal, and on the other hand it is sufficiently rigid to be able to be inserted well into the root canal. The length of the wall segment between the outlet opening of the channel and the thickening can be between 0.5 mm and 7 mm, preferably between 0.5 mm and 4 mm.
    The hollow needle, which forms the starting point of the method according to the invention, comprises a proximal end and a distal end. The hollow needle can extend in a straight line between the proximal end and the distal end. The proximal end can be held in a receptacle. The receptacle can be designed in such a way that it enables the irrigation cannula to be connected to a reservoir for the irrigation liquid. The hollow needle can be connected to the receptacle before or after one of the method steps according to the invention. The receptacle can comprise a luer attachment or a luer lock attachment which is suitable for connection to a commercially available syringe. The hollow needle can consist of a flexible material, so that the hollow needle can be bent elastically to a certain extent without the channel being closed inside. The irrigation cannula can then also follow a curved course of a root canal. The hollow needle preferably consists of a metal or a metal alloy.
    The outer diameter of the hollow needle can for example be between 0.1 mm and 1 mm, preferably between 0.2 mm and 0.6 mm. The length of the irrigation cannula in the finished state can be, for example, between 20 mm and 60 mm. The length of the irrigation cannula denotes the distance from the distal end to the entry into the receptacle.
    The invention also relates to a rinsing cannula, which is designed in particular for rinsing a root canal of a tooth. A proximal section of the irrigation cannula is formed by a hollow needle. A distal end of the irrigation cannula is designed as a thickening. A wall segment forms the direct connection between the thickening and the hollow needle.
    Here, a wall segment denotes a section of the irrigation cannula in which there is no closed wall surface which surrounds an interior space all around. If one considers the wall segment as part of a peripheral surface, the peripheral surface extends over a peripheral angle of less than 360 °. The circumferential angle is preferably between 100 ° and 260 °, more preferably between 150 ° and 210 °. If the wall segment forms the direct connection between the thickening and the hollow needle, there is no section between the wall segment and the thickening in which a wall surface encloses an interior space all around. This is different from a cannula, which is subsequently provided with an opening in the side wall. In the case of a subsequently created opening, there is a channel section between the opening and the closed distal end, in which the interior space is surrounded by a wall surface.
    If an imaginary projection of the thickening onto the outlet opening of the channel of the hollow needle is made, the thickening covers at least 30%, preferably at least 50%, further preferably at least 100% of the cross-sectional area of the outlet opening. In the distal direction, the thickening can have a rounded contour. The thickening can be designed so that it does not protrude from the outer surface of the wall segment. More preferably, the thickening does not protrude from the contour of the hollow needle. The volume of the thickening can correspond to at least 30%, preferably at least 50%, more preferably at least 100% of the volume of the wall segment. The irrigation cannula can be developed with further features that are described in connection with the method according to the invention.
    The invention also relates to a flushing device which comprises a flushing cannula according to the invention and a receptacle. A proximal end of the irrigation cannula is enclosed in the receptacle. The receptacle can be provided with a syringe or another storage container for a liquid for connection. For this purpose, the receptacle can have a Luer approach or a Luer lock approach.
    The invention also relates to a irrigation cannula, which is obtainable by the method according to the invention.
    The invention is described below with reference to the accompanying drawings using exemplary embodiments. It shows:
    1: a side view of an irrigation cannula according to the invention, the proximal end of which is enclosed in a receptacle;
    FIG. 2: the irrigation cannula from FIG. 1 in a view from above;
    CH 710 746 B1
    3: a syringe with the irrigation cannula from FIG. 1;
    4: an enlarged detail from FIG. 2;
    FIG. 5: an enlarged detail from FIG. 1;
    6: a schematic representation of the manufacturing method according to the invention; and
    7: a distal section of a irrigation cannula, which is inserted into a root canal of a tooth.
    1 shows a irrigation cannula 14, which extends from a proximal end 15 to a distal end 16. The proximal end 15 of the irrigation cannula 14 is enclosed in a receptacle 17. According to FIG. 3, the receptacle 17 serves to connect the irrigation cannula 14 to a syringe 18. The syringe 18 comprises a receiving space 19 for a liquid. At its end opposite the irrigation cannula 14, the receiving space 19 is sealed with a piston 20. The volume of the receiving space 19 can be reduced or increased by pushing in or pulling out the piston 20.
    The syringe 18 comprises a dispensing tip which is covered by the receptacle 17 in FIG. 3. The outside of the discharge tip is shaped as a Luer cone. The receptacle 17 of the irrigation cannula 14 has a matching Luer attachment on its inside, via which the receptacle 17 is connected to the syringe 18. A channel extends through the dispensing tip of the syringe 18 and forms a connection between the receiving space 19 of the syringe 18 and a channel that extends inside the irrigation cannula 14. If the plunger 20 is pressed into the syringe 18, the volume of the receiving space 19 decreases and a corresponding amount of liquid moves through the irrigation cannula 14 in the direction of the distal end 16.
    The irrigation cannula 14 comprises a proximal section 21, in which the irrigation cannula 14 is designed as a hollow needle 25. The channel, which extends in the interior of the hollow needle 25, opens into an outlet opening 22. The distal end 16 of the irrigation cannula 14 is formed by a thickening 23. The thickening 23 has an approximately spherical shape and is solid from the same material as the hollow needle 25 in the proximal section 21 of the cannula. A wall segment 24 extends between the thickening 23 and the outlet opening 22 of the hollow needle 25 and forms a direct connection between the thickening 23 and the hollow needle 25. The wall segment 24 forms an extension of the wall of the hollow needle 25. Unlike the wall of the hollow needle 25, the wall segment 24 does not extend over a circumferential angle of 360 °, but only over a circumferential angle of 180 ° around the channel.
    As the enlarged representations in FIGS. 4 and 5 show, the wall segment 24 merges directly into the thickening 23. There is therefore no section between the wall segment 24 and the thickening 23 in which the channel is enclosed by a wall all around. The diameter of the thickening 23 corresponds to the outer diameter of the hollow needle 25. The thickening 23 lies exactly in the extension of the hollow needle 25, so that the thickening 23 does not project over the contour spanned by the hollow needle 25 in cross section. When projected into the plane of the outlet opening 22, the thickening 23 completely covers the outlet opening 22.
    Due to the rounded contour of the thickening 23, the irrigation cannula 14 can be inserted into a root canal of a tooth without causing injuries in the tooth or in the surrounding tissue. The liquid emerging from the outlet opening 22 is deflected to the side in the region of the wall segment 24. The thickening 23 prevents the liquid from forming a sharp jet in the axial direction. The liquid primarily acts on the walls that surround the root canal, while the apex of the root canal is not exposed to increased loads.
    [0028] The irrigation cannula 14 consists of a metal alloy. The hollow needle 25 can be elastically deformed without the channel being closed in the interior of the hollow needle 25. As FIG. 7 shows, the irrigation cannula 14 can follow a curved course of a root canal in a tooth 26.
    The manufacture of the irrigation cannula according to the invention begins with a conventional hollow needle 25 shown in FIG. 6A. In a distal section of the hollow needle 25, part of the needle wall is removed, so that a wall segment 24 remains. The proximal end of the wall segment 24 corresponds to the outlet opening 22 of the hollow needle 25. After this processing step, the irrigation cannula 24 according to the invention is in an intermediate state, which is shown in FIG. 6B. The distal end 16 of the irrigation cannula is sharp-edged, so that there would be a risk of injury if it were used in the patient's mouth.
    In the next process step, a distal section of the wall segment 24 is heated above the melting temperature, so that the metal alloy liquefies. The sharp-edged shape is triggered and a thickening 23 with a rounded contour is formed. With a suitable temperature and a suitable choice of material, the liquefied material contracts on its own to form the thickening 23. If necessary, this process can be supported by aligning the irrigation cannula 14 in a manner suitable for gravity.
    CH 710 746 B1 In order to obtain a sufficient amount of liquefied material, the wall segment 24 shown in FIG. 6B is liquefied over more than 50% of its length. The volume of the thickening 23 is consequently greater than the volume of the part of the wall segment 24 remaining in FIG. 6C.
    权利要求:
    Claims (14)
    [1]
    claims
    1. A method for producing a irrigation cannula (14) with the following steps:
    a. Working a distal portion of a hollow needle (25) to remove a portion of the needle wall so that a wall segment (24) forms the distal end (16) of the irrigation cannula (14);
    b. Heating a distal portion of the wall segment (24) above the melting temperature; and
    c. Forming a thickening (23) from the molten material so that the thickening (23) forms the distal end (16) of the irrigation cannula (14) and that the thickening (23) in a projection onto the outlet opening (22) of the channel of the hollow needle (25) covers at least 30% of the cross-sectional area of the outlet opening (22).
    [2]
    2. The method according to claim 1, characterized in that the thickening (23) is shaped such that the thickening (23) in a projection onto the outlet opening (22) of the channel of the hollow needle (25) at least 50%, more preferably at least 100 % of the cross-sectional area of the outlet opening (22) covers.
    [3]
    3. The method according to claim 1 or 2, characterized in that the thickening (23) is formed with a contour rounded in the distal direction.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the thickening (23) does not protrude relative to the outer surface of the wall segment (24).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that for forming the thickening (23), the wall segment (24) over at least 20% of its length, preferably at least 30% of its length, more preferably at least 50% of its length is melted ,
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that the wall segment (24) extends over a circumferential angle between 100 ° and 260 °, preferably between 150 ° and 210 °.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the wall segment (24) between the outlet opening (22) of the channel and the thickening (23) has a length between 0.5 mm and 7 mm, preferably between 0.5 mm and 4 mm.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that a proximal end of the hollow needle (25) is arranged in a receptacle (17).
    [9]
    9. rinsing cannula, in particular for rinsing a root canal of a tooth (26), in which a proximal section is formed by a hollow needle (25), in which a distal end (16) is designed as a thickening (23) and in which a wall segment ( 24) forms the direct connection between the thickening (23) and the hollow needle (25), the thickening (23) projecting onto the outlet opening (22) of the channel of the hollow needle (25) at least 30% of the cross-sectional area of the outlet opening (22) covered.
    [10]
    10. rinsing cannula according to claim 9, characterized in that the thickening (23) in projection onto the outlet opening (22) of the channel of the hollow needle (25) covers at least 50%, more preferably at least 100% of the cross-sectional area of the outlet opening (22).
    [11]
    11. Rinsing cannula according to claim 9 or 10, characterized in that the volume of the thickening (23) corresponds to at least 30%, preferably at least 50%, further preferably at least 100% of the volume of the wall segment (24).
    [12]
    12. irrigation cannula according to one of claims 9 to 11, characterized in that the wall segment (24) extends over a circumferential angle between 100 ° and 260 °, preferably between 150 ° and 210 °.
    [13]
    13. Rinsing cannula according to one of claims 9 to 12, characterized in that the wall segment (24) has a length between 0.5 mm and 7 mm, preferably between 0.5 mm and 4 mm.
    [14]
    14. Flushing device comprising a irrigation cannula (14) according to one of claims 9 to 13 and a receptacle (17), wherein a proximal end of the irrigation cannula (14) is enclosed in the receptacle (17).
    CH 710 746 B1
    CH 710 746 B1
    CH 710 746 B1
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    同族专利:
    公开号 | 公开日
    WO2015104100A1|2015-07-16|
    DE112014006143A5|2016-09-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4276880A|1978-09-14|1981-07-07|Oscar Malmin|Cannula and process|
    DE59107966D1|1990-09-28|1996-08-01|Sulzer Innotec Ag|HOLLOW NEEDLE FOR MEDICAL USE AND METHOD FOR PRODUCING SUCH A HOLLOW NEEDLE|
    US6494713B1|1999-11-08|2002-12-17|Gary J. Pond|Nickel titanium dental needle|
    US20090004621A1|2007-06-27|2009-01-01|Nancy Quan|Endodontic Irrigation System|WO2018090118A1|2016-11-18|2018-05-24|Alexandre Capelli|Ultrasonic instrument for root canal treatment and retreatment|
    KR102280519B1|2019-03-22|2021-07-29|비엔엘바이오테크 주식회사|Ductility improvement method of needle for endodontic instrument and manufacturing method of needle|
    法律状态:
    2019-07-31| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    EP14150563|2014-01-09|
    PCT/EP2014/076302|WO2015104100A1|2014-01-09|2014-12-02|Irrigation cannula and method for producing an irrigation cannula|
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