Oral cavity washing needle

Abstract

The oral cavity washing needle comprises a nickel-titanium alloy tube body, the nickel-titanium alloy tube body is of a drawing forming structure, the outer diameter of the nickel-titanium alloy tube body ranges from 0.20 mm to 3.5 mm, and the inner diameter of the nickel-titanium alloy tube body ranges from 0.1 mm to 3.3 mm; the length of the nickel-titanium alloy pipe body ranges from 10 mm to 70 mm. A notch is formed in one end of the nickel-titanium alloy pipe body, the notch is communicated with an inner hole of the nickel-titanium alloy pipe body, the notch penetrates through the end portion of one end of the nickel-titanium alloy pipe body, and a stamping needle wall is formed on the residual wall of the nickel-titanium alloy pipe body at the position of the notch. And the end part of the stamping needle wall is warped towards the notch to form a guide wall. The oral cavity flushing needle is made of the nickel-titanium alloy pipe, is not prone to being bent and broken when bent, and can reduce the risk of breakage. The end of the stamping needle wall is warped towards the notch to form a guide wall, and the flushing opening defined by the formed guide wall can reduce damage to the root tip area in a lateral water outlet mode.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an oral irrigation needle. Background Art

[0002] When treating oral diseases, dentists use irrigation needles to rinse the oral cavity or root canals. Currently, the irrigation needles on the domestic market are mainly made of stainless steel. When in use, due to the limited angle of the irrigation needle and the different degrees of mouth opening of the patient, the doctor will bend the stainless steel tube to different degrees to meet the irrigation requirements. The stainless steel irrigation needle will have the risk of breaking during the bending process, and the bent part is easy to pierce the oral tissue. Irrigation needles are divided into two water outlets: side water outlet and straight water outlet. At present, the irrigation needles with side water outlets on the market process the front end of the needle tube into a blind hole and set a notch on the side wall of the needle tube as the water outlet. The processing process is complicated and costly. When the irrigation needle with side opening is used, the water outlet is in a weak position due to the action of external force. When used in a curved root canal, the risk of fracture at the notch position increases. The irrigation needle with straight water outlet exerts pressure on the root apex during irrigation, which may cause excessive stimulation or damage to the root apex area. Utility Model Content

[0003] Based on this, it is necessary to provide an oral irrigation needle that can reduce the risk of breakage and can reduce damage to the apical area.

[0004] In the first aspect, the present application provides an oral irrigation needle, comprising a nickel-titanium alloy tube body, the nickel-titanium alloy tube body having a drawing forming structure, the outer diameter of the nickel-titanium alloy tube body ranging from 0.20 to 3.5 mm, and the inner diameter ranging from 0.1 to 3.3 mm; the length of the nickel-titanium alloy tube body is 10 to 70 mm; a notch is formed at one end of the nickel-titanium alloy tube body, the notch is connected to the inner hole of the nickel-titanium alloy tube body, and the notch passes through the end of one end of the nickel-titanium alloy tube body, the residual wall of the nickel-titanium alloy tube body at the notch position forms a stamped needle wall, and the end of the stamped needle wall is warped toward the notch position to form a guide wall.

[0005] In one embodiment, the guide wall has an arc-shaped structure.

[0006] In one embodiment, the guide wall has a U-shaped structure;

[0007] In one embodiment, the length of the notch in the length direction of the nickel-titanium alloy tube is 0.5 to 10 mm;

[0008] In one embodiment, the solid surface area of ​​the punching needle wall formed by the residual wall accounts for 1 / 5 to 3 / 5 of the solid surface area of ​​the nickel-titanium alloy tube body wall before the notch is formed.

[0009] In one embodiment, the dimensions of the guiding wall at each point in the radial direction of the nitinol tube body do not exceed the outer dimensions of the nitinol tube body at the position where the notch is formed;

[0010] In one embodiment, the solid surface area of the residual wall forming the stamping needle wall accounts for 1 / 4 to 1 / 3 of the solid surface area of the nitinol tube body wall before the notch position is formed.

[0011] In a second aspect, the present application provides a method for manufacturing an oral irrigation needle as described in any one of the above embodiments, including the following steps:

[0012] Provide a nitinol tube blank, where the outer diameter of the nitinol tube blank is 3 to 25 mm;

[0013] Provide a metal wire, where the outer diameter of the metal wire is 0.01 mm to 3 mm less than the inner diameter of the nitinol tube blank;

[0014] Insert the metal wire into the nitinol tube blank to form a composite blank;

[0015] Subject the composite blank to a drawing forming process to remove the metal wire and form a nitinol tube forming blank;

[0016] Cut the nitinol tube forming blank to form a plurality of nitinol tube bodies; the outer diameter range of each nitinol tube body is 0.20 to 3.5 mm, the inner diameter range is 0.1 to 3.3 mm, and the length is 10 to 70 mm;

[0017] Process one end of the nitinol tube body to form a notch; the length of the processed notch is 0.5 to 10 mm;

[0018] Warp and shape the residual wall at the notch position to form the guiding wall.

[0019] In one embodiment, before forming the guiding wall, the method further includes performing a first heat treatment on the nitinol tube body, where the first heat treatment is performed in the range of 250 to 550 °C, the first heat treatment time is 3 to 600 minutes, and after the heat treatment is completed, the entire nitinol tube body is in a thermally activated state, and the austenite transformation end temperature of the needle tube is greater than 30 °C.

[0020] In one embodiment, after performing the first heat treatment temperature and before forming the guiding wall, the method further includes performing a second heat treatment on the nitinol tube body, the temperature of the second heat treatment is 400 °C to 650 °C, and after the second heat treatment, a thermal shaping process is used to warp and shape the residual wall at the notch position to form the guiding wall, and the thermal shaping time is 1 to 30 minutes.

[0021] In one embodiment, after forming the guiding wall, the method further includes the following steps: performing a third heat treatment on the nitinol tube body, wherein the temperature of the third heat treatment of the guiding wall is 450 - 650 °C, and the temperature of the third heat treatment of the other nitinol tube body except the guiding wall is 250 - 550 °C. After the third heat treatment, the head end of the oral irrigation needle with the guiding wall is in a superelastic state, and its austenite transformation end temperature is not higher than 30 °C. The other nitinol tube body except the guiding wall is in a thermally activated state, and the austenite transformation end temperature of the thermally activated state is not lower than 30 °C.

[0022] For the above-mentioned oral irrigation needle, since the nitinol tube body is made of nitinol tube material, and because titanium-nickel alloy has good flexibility and is not easily bent and broken when bent, it is convenient for doctors to bend during oral irrigation without breaking. Moreover, due to the flexibility of the titanium-nickel alloy itself, it can easily penetrate into the root canal or any part of the oral cavity, and the usability is also good, which can reduce the risk of fracture. A notch is directly formed at one end of the nitinol tube body of the oral irrigation needle. The notch communicates with the inner hole of the nitinol tube body, and the notch penetrates through the end of one end of the nitinol tube body. The residual wall of the nitinol tube body at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall. The flushing water inlet surrounded by the guiding wall formed in this way, when in use by a doctor, after the flushing liquid is pushed into the needle tube lumen through a syringe and reaches the head end of the needle tube, due to the blockage of one side of the guiding wall at the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the needle tube lumen continuously, but slides out from the notch located on the side. When flushing the tooth surface and gums, the way of the flushing liquid sliding out laterally can reduce the direct impact of the flushing liquid on the gums, reduce the irritation and discomfort to the patient, and improve the comfort of the patient. When performing root canal irrigation, the way of the flushing liquid sliding out laterally will not cause pressure in the apical direction, thereby reducing the irritation and damage to the periapical tissue. Moreover, the lateral water flow of the flushing liquid can enhance the scouring ability of the root canal wall and is also conducive to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully diffuse to all parts of the root canal, including difficult-to-reach areas such as the apical region and lateral branch canals, thereby more effectively removing bacteria and residues in the root canal, helping to improve the effect of root canal treatment, and the lateral water outlet method can reduce damage to the apical region. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an oral irrigation needle according to an embodiment;

[0024] Figure 2 is a schematic structural diagram of an oral irrigation needle according to an embodiment;

[0025] Figure 3Schematic structural diagram of a Ni-Ti alloy tube blank in the manufacturing method of an oral irrigation needle according to an embodiment;

[0026] Figure 4 Schematic structural diagram of inserting a metal wire into a Ni-Ti alloy tube blank in the manufacturing method of an oral irrigation needle according to an embodiment;

[0027] Figure 5 Schematic structural diagram of a composite blank formed after inserting a metal wire into a Ni-Ti alloy tube blank in the manufacturing method of an oral irrigation needle according to an embodiment;

[0028] Figure 6 Schematic diagram of the state of the composite blank after drawing in the manufacturing method of an oral irrigation needle according to an embodiment;

[0029] Figure 7 Schematic diagram of the Ni-Ti alloy tube after truncation in the manufacturing method of an oral irrigation needle according to an embodiment;

[0030] Figure 8 Schematic diagram of the processing position when forming a notch on the Ni-Ti alloy tube in the manufacturing method of an oral irrigation needle according to an embodiment;

[0031] Figure 9 Schematic structural diagram of a notch presenting a rectangular cross-section in the manufacturing method of an oral irrigation needle according to an embodiment;

[0032] Figure 10 Schematic structural diagram of a notch presenting a rectangular cross-section in the manufacturing method of an oral irrigation needle according to an embodiment;

[0033] Figure 11 Schematic structural diagram of a notch residual wall presenting a triangular cross-section in the manufacturing method of an oral irrigation needle according to an embodiment;

[0034] Figure 12 Schematic structural diagram of a notch residual wall presenting a triangular cross-section in the manufacturing method of an oral irrigation needle according to an embodiment;

[0035] Figure 13 Schematic diagram of a guiding wall formed after warping of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle according to an embodiment;

[0036] Figure 14 Schematic diagram of a guiding wall formed after warping of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle according to an embodiment;

[0037] Figure 15 Schematic diagram of a guiding wall formed after warping of the residual wall presenting a triangular cross-section of a notch in the manufacturing method of an oral irrigation needle according to an embodiment;

[0038] Figure 16Schematic diagram of the residual wall with a triangular cross-section in the manufacturing method of an oral irrigation needle in an embodiment, after warping, forming a guiding wall;

[0039] Figure 17 Schematic diagram of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle in an embodiment, after warping, forming a guiding wall;

[0040] Figure 18 Schematic diagram of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle in an embodiment, after warping, forming a guiding wall;

[0041] Figure 19 Schematic diagram of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle in an embodiment, after warping, forming a guiding wall;

[0042] Figure 20 Schematic diagram of the residual wall of a square cross-section notch in the manufacturing method of an oral irrigation needle in an embodiment, after warping, forming a guiding wall;

[0043] Figure 21 Schematic diagram of the morphology of the needle tube after heat treatment in the manufacturing method of an oral irrigation needle in an embodiment;

[0044] Figure 22 Schematic diagram of the morphology of the needle tube after heat treatment in the manufacturing method of an oral irrigation needle in an embodiment;

[0045] Figure 23 Schematic diagram of the morphology of the needle tube after heat treatment in the manufacturing method of an oral irrigation needle in an embodiment;

[0046] Figure 24 Schematic diagram of the morphology of the needle tube after heat treatment in the manufacturing method of an oral irrigation needle in an embodiment;

[0047] Figure 25 Schematic diagram of the morphology of the needle tube after heat treatment in the manufacturing method of an oral irrigation needle in an embodiment;

[0048] Figure 26 Schematic diagram of the morphology of the needle tube after heat setting and then size reduction processing in the manufacturing method of an oral irrigation needle in an embodiment;

[0049] Figure 27 Schematic diagram of the morphology of the needle tube after heat setting and then size reduction processing in the manufacturing method of an oral irrigation needle in an embodiment;

[0050] Figure 28 Schematic diagram of the morphology of the needle tube after heat setting and then size reduction processing in the manufacturing method of an oral irrigation needle in an embodiment;

[0051] Figure 29Schematic diagram of the shape of the syringe barrel of the oral irrigation needle in the manufacturing method of an embodiment after heat setting and then size reduction processing;

[0052] Figure 30 Schematic diagram of the shape of the syringe barrel of the oral irrigation needle in the manufacturing method of an embodiment after heat setting and then size reduction processing;

[0053] Figure 31 Schematic diagram of an oral irrigation needle and a needle seat assembled in an embodiment;

[0054] Figure 32 Schematic diagram of an oral irrigation needle and a needle seat assembled in an embodiment;

[0055] Figure 33 Schematic diagram of the skid-type water outlet after an oral irrigation needle and a needle seat are assembled in an embodiment. Detailed implementation manners

[0056] For ease of understanding the present application, in order to make the above objects, features and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application will be made in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application, and the preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise specifically defined. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0057] In a first aspect, please refer to Figure 1 and Figure 2, this application provides an oral irrigation needle, including a nickel-titanium alloy tube body 100. The nickel-titanium alloy tube body 100 has a drawn forming structure. The outer diameter range of the nickel-titanium alloy tube body is 0.20 - 3.5 mm, and the inner diameter range is 0.1 - 3.3 mm. The length of the nickel-titanium alloy tube body is 10 - 70 mm. One end of the nickel-titanium alloy tube body 100 forms a notch 110. The notch 110 communicates with the inner hole of the nickel-titanium alloy tube body 100, and the notch 110 penetrates through the end of one end of the nickel-titanium alloy tube body. The residual wall 120 of the nickel-titanium alloy tube body 100 at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall 121.

[0058] For the above-mentioned oral irrigation needle, since the nickel-titanium alloy tube body is made of nickel-titanium alloy material, and because the titanium-nickel alloy has good flexibility and is not easily bent and broken when bent, it is convenient for doctors to bend during oral irrigation without breaking. Moreover, due to the flexibility of the titanium-nickel alloy itself, it can easily penetrate into the root canal or any part of the oral cavity, and the usability is also good, which can reduce the risk of fracture. And the oral irrigation needle directly forms a notch at one end of the nickel-titanium alloy tube body. The notch communicates with the inner hole of the nickel-titanium alloy tube body, and the notch penetrates through the end of one end of the nickel-titanium alloy tube body. The residual wall of the nickel-titanium alloy tube body at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall. In this way, the flushing water outlet surrounded by the guiding wall formed. When a doctor uses it, after the flushing liquid is pushed into the inner cavity of the needle tube by a syringe and reaches the head end of the needle tube, due to the blockage of one side of the guiding wall at the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the inner cavity of the needle tube, but slides out from the notch located on the side. When flushing the tooth surface and gums, the way of the flushing liquid sliding out sidewise can reduce the direct impact of the flushing liquid on the gums, reduce the irritation and discomfort to the patient, and improve the comfort of the patient. When performing root canal irrigation, the way of the flushing liquid sliding out sidewise will not cause pressure in the apical direction, thereby reducing the irritation and damage to the periapical tissue. And the sidewise flowing water of the flushing liquid can enhance the scouring ability of the root canal wall and is also conducive to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully spread to all parts of the root canal, including difficult-to-reach areas such as the apical region and the lateral branch root canals, so as to more effectively remove bacteria and residues in the root canal, contribute to improving the root canal treatment effect, and the sidewise water outlet method can reduce the damage to the apical region.

[0059] For example, the guiding wall 121 has an arc structure. Another example is that the guiding wall 121 has a U-shaped structure. In this way, it can ensure that the guiding wall has a good guiding effect on the flushing liquid, so that the water outlet method is the sidewise water outlet method.

[0060] In one embodiment, the length of the notch 110 in the length direction of the nickel-titanium alloy tube body is 0.5 to 10 mm; for example, the solid surface area of the residual wall forming the stamping needle wall accounts for 1 / 5 to 3 / 5 of the solid surface area of the nickel-titanium alloy tube body wall before the position where the notch is not formed. For example, the dimensions of the guiding wall at each point in the radial direction of the nickel-titanium alloy tube body do not exceed the outer dimensions of the nickel-titanium alloy tube body at the position where the notch is formed; for example, the solid surface area of the residual wall forming the stamping needle wall accounts for 1 / 4 to 1 / 3 of the solid surface area of the nickel-titanium alloy tube body wall before the position where the notch is not formed. In this way, the strength of the residual wall can be better ensured.

[0061] For the above oral irrigation needle, since the nickel-titanium alloy tube body is made of nickel-titanium alloy tube material, and due to the good flexibility of the nickel-titanium alloy, it is not easy to break when bent. When performing oral irrigation, it is convenient for doctors to bend without breaking. And due to the flexibility of the nickel-titanium alloy itself, it can easily penetrate into any part of the root canal or oral cavity, and the usability is also better, which can reduce the risk of fracture. And a notch is directly formed at one end of the nickel-titanium alloy tube body of the oral irrigation needle. The notch communicates with the inner hole of the nickel-titanium alloy tube body, and the notch penetrates through the end of one end of the nickel-titanium alloy tube body. The residual wall of the nickel-titanium alloy tube body at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall. The flushing water outlet surrounded by the guiding wall formed in this way. When the doctor uses it, after the flushing liquid is pushed to the inner cavity of the needle tube and reaches the head end of the needle tube through the syringe, due to the blockage of one side guiding wall at the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the inner cavity of the needle tube, but slides out from the notch located on the side. When flushing the tooth surface and gums, the way of the flushing liquid sliding out sidewise can reduce the direct impact of the flushing liquid on the gums, reduce the stimulation and discomfort to the patient, and improve the comfort of the patient. When performing root canal irrigation, the way of the flushing liquid sliding out sidewise will not cause pressure in the apical direction, thereby reducing the stimulation and damage to the periapical tissue. And the sidewise flowing water of the flushing liquid can enhance the scouring ability of the root canal wall and is also beneficial to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully diffuse to all parts of the root canal, including difficult-to-reach areas such as the apical region and the lateral branch root canals, so as to more effectively remove bacteria and residues in the root canal, contribute to improving the root canal treatment effect, and the sidewise water outlet method can reduce the damage to the apical region.

[0062] In a second aspect, the present application provides a manufacturing method of the oral irrigation needle as described in any one of the above embodiments, including the following steps:

[0063] S1: Provide a nickel-titanium alloy tube blank, wherein the outer diameter of the nickel-titanium alloy tube blank is 3 to 25 mm;

[0064] Such asFigure 3 As shown, it is a schematic structural diagram of a nickel-titanium alloy tube blank. The nickel-titanium alloy tube blank of the present application can, according to the requirements of the size of the flushing needle tube, drill a large-diameter nickel-titanium alloy rod through an electric discharge machining machine, and then obtain an inner hole of the required size through methods such as cutting by a wire cutting machine tool and boring by a boring tool, which is called a nickel-titanium alloy tube blank. For example, the outer diameter of the nickel-titanium alloy tube blank is 3 to 25 mm.

[0065] S2: Provide a metal wire, wherein the outer diameter of the metal wire is 0.01 mm to 3 mm less than the inner diameter of the nickel-titanium alloy tube blank;

[0066] For example, the material of the metal wire is nickel-titanium alloy, stainless steel, etc., and nickel-titanium alloy is preferred. Of course, the metal wire can also be understood as a metal rod.

[0067] S3: Insert the metal wire into the nickel-titanium alloy tube blank to form a composite blank;

[0068] In this embodiment, a metal wire / rod with an outer diameter slightly smaller than that of the nickel-titanium alloy tube blank is used as the inner core and placed into the nickel-titanium alloy tube blank with a hollow structure to form a composite blank. In this embodiment, by making the outer diameter of the metal wire / rod 0.01 mm to 3 mm less than the inner diameter of the nickel-titanium alloy tube blank, it is ensured that subsequent drawing can be carried out better. As Figure 4 and Figure 5 shown, Figure 4 is a schematic diagram of the process of inserting the metal wire into the nickel-titanium alloy tube blank, Figure 5 is a schematic diagram of the composite blank formed after inserting the metal wire into the nickel-titanium alloy tube blank.

[0069] S4: Subject the composite blank to a drawing forming process to remove the metal wire to form a nickel-titanium alloy tube forming blank;

[0070] For example, subject the composite blank to drawing forming as shown in Figure 5 and Figure 6 shown, Figure 5 is a schematic structural diagram of the composite blank before drawing, Figure 6Schematic diagram of the composite blank after drawing. For example, after the composite blank is subjected to synchronous multi-pass drawing and multiple annealing processes, when the size of the composite blank reaches the set size, the inner core in the composite blank is removed, that is, the internal metal wire is removed. Subsequently, after multiple-pass drawing and straightening processes again, a nickel-titanium alloy tube with the required performance and size is obtained. For example, during the drawing forming process, the cold drawing deformation amount of the composite blank or the nickel-titanium alloy tube is 20%-75%, and the preferred deformation amount is 30%-50%. Thus, with the above cold drawing deformation amount and the outer diameter of the metal wire being 0.01 mm to 3 mm smaller than the inner diameter of the nickel-titanium alloy tube blank, it can better ensure that the inner hole of the nickel-titanium alloy tube blank does not deform during the drawing forming process, ensure that the tube wall is relatively thin, and at the same time ensure the smooth removal of the internal metal wire after drawing forming. For example, after removing the wire shape, the formed blank of the nickel-titanium alloy tube after drawing is also subjected to annealing and straightening processes. For example, the annealing temperature is 600-900 °C, and the straightening treatment temperature is 400-600 °C. Thus, through annealing and straightening treatments, it is convenient to further improve plasticity and toughness, eliminate internal stress, and effectively improve the internal stress that may be generated in the nickel-titanium alloy tube during the processing due to cold deformation, thermal deformation, etc. If these internal stresses are not eliminated in time, it may lead to stress concentration phenomena in the material during use, thereby causing cracks or fractures. In addition, it is also beneficial to improve the fatigue resistance of the formed blank of the nickel-titanium alloy tube and extend the service life.

[0071] S5: Cut the formed blank of the nickel-titanium alloy tube to form multiple nickel-titanium alloy tube bodies; the outer diameter range of each nickel-titanium alloy tube body is 0.20-3.5 mm, the inner diameter range is 0.1-3.3 mm, and the length is 10-70 mm;

[0072] For example, cut the formed blank of the nickel-titanium alloy tube, and the cut length is the length required for making a single flushing needle. The outer diameter range of the nickel-titanium alloy tube is 0.20-3.5 mm, the inner diameter range is 0.1-3.3 mm, the cut length is 10-70 mm, and the cut nickel-titanium alloy tube is used as the needle tube for making the flushing needle. As Figure 7 shown, Figure 7 is a single nickel-titanium alloy tube body after cutting.

[0073] S6: Process one end of the nickel-titanium alloy tube body to form a notch; the length of the processed notch is 0.5-10 mm;

[0074] For example, use wire cutting, electric discharge machining, grinding, or machining methods to process one end of the nickel-titanium alloy tube body to remove a part of the entity. As Figure 8As shown in the figure, a notch 110 is machined at one end of the Ni-Ti alloy tube body 100. The part of the Ni-Ti alloy tube body 100 where the notch 110 is machined is the machining section 20, and the remaining part is the non-machined section 30. For example, the machining length is 0.5 - 10 mm, and the remaining solid part of the machining section accounts for 1 / 5 - 3 / 5, preferably 1 / 4 - 1 / 3, of the solid surface area of the machining section before machining. The remaining solid part of the machining section 20, when viewed from the front view direction such as Figure 8 can be in the shape of a rectangle, a triangle, or an irregular shape.

[0075] S7: Warp and shape the residual wall at the notch position to form the guiding wall.

[0076] For example, through one-time or multiple heat treatment methods, the performance of the needle tube of the irrigation needle is processed and the remaining solid part (also called the head end of the needle tube) after machining the machining section is warped and shaped to form the guiding wall. The overall state of the needle tube of the irrigation needle can be in a thermally activated state or a superelastic state, or the end part can be in a superelastic state and the other parts are in a thermally activated state. Among them, it is preferably that the end part is in a superelastic state and the other parts are in a thermally activated state. In this application, the residual wall at the notch position is warped and shaped to form the guiding wall 121. The flushing water outlet surrounded by the guiding wall formed in this way, when used by a doctor, after the flushing liquid is pushed to the inner cavity of the needle tube and reaches the head end of the needle tube through a syringe, due to the blockage of one side of the guiding wall at the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the inner cavity of the needle tube, but slides out from the notch located on the side. When flushing the tooth surface and gums, the way of the flushing liquid sliding out sidewise can reduce the direct impact of the flushing liquid on the gums, reduce the irritation and discomfort to the patient, and improve the comfort of the patient. When performing root canal irrigation, the way of the flushing liquid sliding out sidewise will not cause pressure in the apical direction, thereby reducing the irritation and damage to the periapical tissue, and the sidewise flowing water of the flushing liquid can enhance the scouring ability of the root canal wall and is also conducive to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully spread to all parts of the root canal, including difficult-to-reach areas such as the apical region and the lateral branch root canals, so as to more effectively remove bacteria and residues in the root canal, contribute to improving the effect of root canal treatment, and the sidewise water outlet method can reduce the damage to the apical region.

[0077] In one embodiment, before forming the guiding wall, the method further includes performing a first heat treatment on the Ni-Ti alloy tube body, wherein the first heat treatment is performed in the range of 250 - 550 °C, the first heat treatment time is 3 - 600 minutes, and after the heat treatment is completed, the entire Ni-Ti alloy tube body is in a thermally activated state, and the austenite transformation end temperature of the needle tube is greater than 30 °C.

[0078] In one embodiment, after the first heat treatment temperature and before forming the guiding wall, the method further includes performing a second heat treatment on the nickel-titanium alloy tube body. The temperature of the second heat treatment is 400°C to 650°C. After the second heat treatment, a thermal setting treatment is used to warp and shape the residual wall at the notch position to form the guiding wall, and the thermal setting time is 1 to 30 minutes. In this way, the head end part of the needle tube is shaped during the heat treatment process. After the second heat treatment is completed, the head end of the needle tube warps, and the size of each point of the warped part along the radial direction of the needle tube does not exceed the outer dimension of the needle tube in the unprocessed section. After the head end part of the needle tube is shaped, the head end of the needle tube becomes the water outlet, and the water outlet faces one side of the needle tube, forming a side flushing port. When the doctor uses it, after the flushing liquid is pushed into the inner cavity of the needle tube by the syringe and reaches the head end of the needle tube, due to the blockage of the solid part on one side of the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the inner cavity of the needle tube, but slides out from the notch located on the side.

[0079] In one embodiment, after forming the guiding wall, the method further includes the following steps: performing a third heat treatment on the nickel-titanium alloy tube body. The temperature of the third heat treatment of the guiding wall is 450 - 650°C, and the temperature of the third heat treatment of the other nickel-titanium alloy tube body except the guiding wall is 250 - 550°C. After the third heat treatment, the head end of the oral irrigation needle with the guiding wall is in a superelastic state, and its austenite transformation end temperature is not higher than 30°C. The other nickel-titanium alloy tube body except the guiding wall is in a thermally activated state, and the austenite transformation end temperature of the thermally activated state is not lower than 30°C. In this embodiment, in order to maintain the flexibility of the part other than the head end of the needle tube, the needle tube is heat-treated one or more times again. The head end of the needle tube is within the range of 450 - 650°C, and the other parts of the needle tube are within the range of 250 - 550°C. After the heat treatment is completed, the head end of the irrigation needle is in a superelastic state, the head end has good elasticity, and its austenite transformation end temperature is not higher than 30°C; the other parts of the needle tube are in a thermally activated state, and the austenite transformation end temperature of the thermally activated state is not lower than 30°C, and the needle tube in the thermally activated state has good flexibility. In particular, the superelastic head end of the irrigation needle can provide better guidance and penetration, making it easier for the irrigation needle to enter under the gums, between the teeth, and deep into the root canal; the superelastic head design can provide better operability, and the doctor can more easily control the direction and depth of the irrigation needle, so as to more accurately clean the required area. Due to the good flexibility of the needle tube in the thermally activated state, the doctor can pre-bend it at any angle according to the actual situation of the patient's oral structure, tooth position, etc. to meet different irrigation requirements. For example, in the case of root canal irrigation, the good flexibility of the irrigation needle can also well conform to the root canal and is not easy to get stuck in the root canal file, so as to better clean the root canal.

[0080] The oral irrigation needle produced by the above - mentioned method for manufacturing an oral irrigation needle. Since the nickel - titanium alloy tube body is made of nickel - titanium alloy tube material, due to the good flexibility of the nickel - titanium alloy, it is not easy to break when bent. When performing oral irrigation, it is convenient for doctors to bend without breaking. And because of the flexibility of the nickel - titanium alloy itself, it can easily penetrate into the root canal or any part of the oral cavity, with good usability and can reduce the risk of fracture. The oral irrigation needle directly forms a notch at one end of the nickel - titanium alloy tube body. The notch communicates with the inner hole of the nickel - titanium alloy tube body, and the notch penetrates through the end of one end of the nickel - titanium alloy tube body. The residual wall of the nickel - titanium alloy tube body at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall. The flushing water outlet surrounded by the guiding wall formed in this way. When a doctor uses it, after the flushing liquid is pushed into the needle tube lumen by a syringe and reaches the head end of the needle tube, due to the blockage of one side guiding wall at the head end of the needle tube and the side - facing state of the flushing port, the flushing liquid does not flow forward along the needle tube lumen continuously, but slips out from the notch located on the side. When flushing the tooth surface and gums, the way of the flushing liquid slipping out side - ways can reduce the direct impact of the flushing liquid on the gums, reduce the irritation and discomfort to the patient, and improve the comfort of the patient. When performing root canal irrigation, the way of the flushing liquid slipping out side - ways will not cause pressure in the apical direction, thus reducing the irritation and damage to the periapical tissue. And the side - flowing water flow can enhance the scouring ability of the root canal wall and is also conducive to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully spread to all parts of the root canal, including difficult - to - reach areas such as the apical region and lateral branch canals, so as to more effectively remove bacteria and residues in the root canal, contribute to improving the effect of root canal treatment, and the side - flowing water - out way can reduce damage to the apical region.

[0081] The following further illustrates the oral irrigation needle and the method for manufacturing the oral irrigation needle of the present application with specific embodiments.

[0082] The method for manufacturing the oral irrigation needle of the specific embodiment of the present application includes the following steps:

[0083] 1. Manufacture a nickel - titanium alloy tube for the irrigation needle

[0084] According to the requirements of the needle tube size of the irrigation needle, drill a large - diameter nickel - titanium alloy rod with a wire - cut EDM machine, and then obtain an inner hole of the required size through methods such as cutting with a wire - cutting machine tool and boring with a boring tool, which is called a nickel - titanium alloy tube blank. The outer diameter of the nickel - titanium alloy tube blank is 3 - 25 mm. Please refer to Figure 3 , which is a schematic structural diagram of the nickel - titanium alloy tube blank.

[0085] Put a metal wire / rod with an outer diameter slightly smaller than the nickel - titanium alloy tube blank into the nickel - titanium alloy tube blank with a hollow structure to form a composite embryo. AsFigure 4 As shown, it is a schematic diagram of inserting a wire / rod into a NiTi alloy tube blank. The outer diameter of the wire / rod is 0.01 mm to 3 mm smaller than the inner diameter of the NiTi alloy tube blank. The material of the inner layer wire / rod is NiTi alloy, stainless steel, etc., and NiTi alloy is preferred. Figure 5 It is the appearance of the composite blank formed after the wire is inserted into the NiTi alloy tube blank.

[0086] After subjecting the composite blank to synchronous multi-pass drawing and multiple annealing processes, when the size of the composite blank reaches the set size, the inner core in the composite blank is removed, and then after multi-pass drawing and straightening processes again, a NiTi alloy tube with the required properties and dimensions is obtained. The cold drawing deformation amount of the NiTi alloy tube is 20% - 75%, and the preferred deformation amount is 30% - 50%. The annealing temperature is 600 - 900 °C, and the straightening treatment temperature is 400 - 600 °C. Figure 6 It is a schematic diagram of the state of the composite blank after drawing.

[0087] 2. Truncation

[0088] After removing the wire, the NiTi alloy tube is truncated. The truncated length is the length required for making a single flushing needle. The outer diameter range of the NiTi alloy tube is 0.20 - 3.5 mm, the inner diameter range is 0.1 - 3.3 mm, and the truncated length is 10 - 70 mm. The truncated NiTi alloy tube is used as the needle tube for making the flushing needle. Figure 7 It is a schematic diagram of the truncated NiTi alloy tube.

[0089] 3. Size reduction processing of the NiTi alloy tube

[0090] The end of the needle tube is processed by wire cutting, electric discharge machining, grinding, or machining to remove a part of the solid. The processing length is 0.5 - 10 mm, and the remaining solid part of the processed section accounts for 1 / 5 - 3 / 5, preferably 1 / 4 - 1 / 3, of the surface area of the solid before processing in the processed section. When viewed from the following front view direction, the shape of the remaining solid part in the processed section can be rectangular, triangular, or irregular. As Figure 8 described, one end of the truncated NiTi alloy tube 100 is the processed section 20, and the other end is the unprocessed section 30. A notch 110 is formed in the processed section 20. Figure 8 It is for forming a notch with a rectangular cross-section, Figure 9 and Figure 10 It is for the notch presenting a rectangular cross-section, Figure 11 and Figure 12 It is for the remaining wall of the notch presenting a triangular cross-section.

[0091] 4. Heat treatment of the needle tube

[0092] Through one or multiple heat treatment methods, the performance of the syringe needle tube is processed, and the remaining solid part (also called the head end of the needle tube) after processing the processing section is warped and shaped. The overall state of the syringe needle tube can be in a thermally activated state or a superelastic state, or the end can be in a superelastic state and the other parts in a thermally activated state. Preferably, the end is in a superelastic state and the other parts are in a thermally activated state.

[0093] 4.1 Processing method where the head end of the needle tube is in a superelastic state and the other parts are in a thermally activated state

[0094] The syringe needle tube is heat-treated in the range of 250 - 550 °C, and the heat treatment time is 3 - 600 minutes. After the heat treatment is completed, the entire needle tube is in a thermally activated state, and the austenite transformation end temperature of the needle tube is greater than 30 °C.

[0095] The needle tube is heat-treated again, and the heat treatment temperature is 400 °C - 650 °C, preferably 450 °C - 600 °C, and the shaping time is 1 - 30 minutes. During the heat treatment process, the head end part of the needle tube is shaped. After the second heat treatment is completed, the head end of the needle tube warps, and the dimensions of the warped part at each point along the radial direction of the needle tube do not exceed the outer dimensions of the needle tube in the unprocessed section.

[0096] Figure 13 and Figure 14 Schematic diagram of the residual wall with a square cross-section notch warping to form a guiding wall.

[0097] Figure 15 and Figure 16 Schematic diagram of the residual wall with a triangular cross-section of the notch residual wall warping to form a guiding wall.

[0098] Figure 17 and Figure 18 Schematic diagram of the residual wall with a square cross-section notch of another embodiment warping to form a guiding wall.

[0099] Figure 19 and Figure 20 Schematic diagram of the residual wall with a square cross-section notch of another embodiment warping to form a guiding wall.

[0100] After the head end part of the needle tube is shaped, the head end of the needle tube becomes the water outlet, and the water outlet faces one side of the needle tube, forming a side flushing port. When the doctor uses it, after the flushing liquid is pushed into the needle tube lumen by the syringe and reaches the head end of the needle tube, due to the blockage of the solid part on one side of the head end of the needle tube and the side state of the flushing port, the flushing liquid does not flow forward along the needle tube lumen, but slides out from the notch on the side.

[0101] When flushing the tooth surface and gums, the way that the flushing liquid exits laterally in a skidding manner can reduce the direct impact of the flushing liquid on the gums, reduce the irritation and discomfort to the patient, and improve the patient's comfort. When performing root canal flushing, the way that the flushing liquid exits laterally in a skidding manner will not cause pressure in the apical direction, thereby reducing the irritation and damage to the periapical tissue. Moreover, the lateral water flow of the flushing liquid can enhance the scouring ability of the root canal wall and is also conducive to the reflux of the flushing liquid. The reflux of the flushing liquid can ensure that the flushing liquid in the root canal can fully spread to all parts of the root canal, including difficult-to-reach areas such as the apical region and lateral branch canals, so as to more effectively remove bacteria and residues in the root canal and help improve the effect of root canal treatment.

[0102] In order to maintain the flexibility of the part outside the tip of the needle tube, the needle tube is heat-treated one or more times. The tip of the needle tube is within the range of 450 - 650 °C, and the other parts of the needle tube are within the range of 250 - 550 °C. After the heat treatment is completed, the tip of the flushing needle is in a super-elastic state, the tip has good elasticity, and the end temperature of its austenite transformation is not higher than 30 °C; the other parts of the needle tube are in a thermally activated state, and the end temperature of the austenite transformation in the thermally activated state is not lower than 30 °C, and the thermally activated needle tube has good flexibility.

[0103] The tip of the flushing needle in the super-elastic state can provide better guidance and penetrability, making it easier for the flushing needle to enter under the gums, into the tooth gaps, and deep into the root canal; the super-elastic head design can provide better operability, and the doctor can more easily control the direction and depth of the flushing needle, so as to more accurately clean the required area. Due to the good flexibility of the needle tube in the thermally activated state, the doctor can pre-bend it at any angle according to the actual situation such as the patient's oral structure and tooth position to adapt to different flushing requirements. For example, in the case of root canal flushing, the good flexibility of the flushing needle can also well conform to the root canal and is not easy to get stuck in the root canal file, so as to better clean the root canal.

[0104] 4.2 Processing method for the whole needle tube of the flushing needle to be in a super-elastic state

[0105] For a flushing needle with a needle tube outer diameter in the range of 0.2 - 0.5 mm, since the outer diameter of the needle tube is relatively small, the whole needle tube can also be processed into a super-elastic state.

[0106] The needle tube of the flushing needle is heat-treated for the first time within the range of 250 - 550 °C, and the heat treatment time is 3 - 600 minutes. After the heat treatment is completed, the whole needle tube is in a thermally activated state, and the end temperature of the austenite transformation of the needle tube is greater than 30 °C.

[0107] The syringe needle is heat-treated for a second time. The heat treatment temperature is 400°C to 650°C, preferably 450°C - 600°C, and the shaping time is 1 to 30 minutes. During the heat treatment process, the head end part of the syringe needle is shaped. After the second heat treatment is completed, the head end of the syringe needle warps, and the dimensions of the warped part at each point along the radial direction of the syringe needle do not exceed the outer dimensions of the unprocessed section of the syringe needle. After the head end part of the syringe needle is shaped, the head end of the syringe needle becomes the water outlet, and the water outlet faces one side of the syringe needle, forming a side flushing port. When a doctor uses it, after the flushing liquid is pushed into the inner cavity of the syringe needle through the syringe and reaches the head end of the syringe needle, due to the blockage of the solid part on one side of the head end of the syringe needle and the side state of the flushing port, the flushing liquid does not flow forward along the inner cavity of the syringe needle, but slides out in a leapfrog manner from the notch located on the side.

[0108] The syringe needle in an overall super-elastic state can also be shaped into a syringe needle bent at a certain angle during the second heat setting process, so that the flushing needle can have a certain pre-bending angle, enabling the doctor to reach the part to be cleaned more smoothly during use.

[0109] Since the overall outer diameter of the flushing needle in a super-elastic state is small, and the nickel-titanium alloy itself has good elasticity. The head end is in a super-elastic state, which can provide better guiding and penetrating properties. The other parts are in a super-elastic state, which can withstand deformations such as bending and torsion, and can quickly return to the original state after being stressed, and can also well meet the use requirements.

[0110] 5. Heat treatment first and then size reduction processing

[0111] Parts 3 and 4 discuss the processing method of first performing size reduction processing on the nickel-titanium alloy tube and then heat treatment. In a patent for a flushing needle and its manufacturing method in this application, the implementation method of the product can also first perform heat treatment and then size reduction processing.

[0112] 5.1 Heat treatment

[0113] Through one or multiple heat treatment methods, the performance of the syringe needle of the flushing needle is processed and the head end of the syringe needle is warped and shaped. The length of the warped and shaped head end of the syringe needle is 2 to 15 mm. The overall state of the syringe needle of the flushing needle can be in a thermally activated state or a super-elastic state, or the end is in a super-elastic state and the other parts are in a thermally activated state. Among them, it is preferred that the head end of the syringe needle is in a super-elastic state and the other parts are in a thermally activated state.

[0114] 5.1.1 Processing method with the head end of the syringe needle in a super-elastic state and the other parts in a thermally activated state

[0115] The flushing needle tube is heat-treated within the range of 250 to 550 °C for 3 to 600 minutes. After the heat treatment is completed, the entire needle tube is in a thermally activated state, and the end temperature of austenite transformation of the needle tube is greater than 30 °C.

[0116] The needle tube is heat-treated again at a temperature of 400 °C to 650 °C, preferably 450 °C to 600 °C, and the shaping time is 1 to 30 minutes. During the heat treatment process, the head end part of the needle tube is shaped. After the second heat treatment is completed, the head end of the needle tube is in a bent shape.

[0117] In order to maintain the flexibility of the part other than the head end of the needle tube, the needle tube is heat-treated one or more times again. The head end of the needle tube is within the range of 450 to 650 °C, and the other parts of the needle tube are within the range of 250 to 550 °C. After the heat treatment is completed, the head end of the flushing needle is in a super-elastic state, with good elasticity at the head end, and the end temperature of austenite transformation is not higher than 30 °C; the other parts of the needle tube are in a thermally activated state, and the end temperature of austenite transformation in the thermally activated state is not lower than 30 °C, and the thermally activated needle tube has good flexibility.

[0118] As Figures 21 to 23 shown, it is a schematic diagram after heat treatment of three specific embodiments. Figure 21 It is a schematic diagram of the shape of an embodiment after the needle tube is heat-treated first. Figure 22 It is a schematic diagram of the shape of an embodiment after the needle tube is heat-treated first. Figure 23 It is a schematic diagram of the shape of an embodiment after the needle tube is heat-treated first.

[0119] 5.1.2 Processing method for the entire flushing needle tube to be in a super-elastic state

[0120] For the flushing needle with a needle tube outer diameter in the range of 0.2 to 0.5 mm, since the outer diameter of the needle tube is relatively small, the entire needle tube can also be processed into a super-elastic state.

[0121] The flushing needle tube is heat-treated within the range of 250 to 550 °C for 3 to 600 minutes. After the heat treatment is completed, the entire needle tube is in a thermally activated state, and the end temperature of austenite transformation of the needle tube is greater than 30 °C.

[0122] The needle tube is heat-treated again at a temperature of 400 °C to 650 °C, preferably 450 °C to 600 °C, and the shaping time is 1 to 30 minutes. During the heat treatment process, the head end part of the needle tube is shaped. After the second heat treatment is completed, the head end of the needle tube is in a bent shape. In addition to the head end being bent, for the entire needle tube in a super-elastic state, during the second heat setting process, the middle part of the needle tube can also be shaped into a bent needle tube at a certain angle, so that the flushing needle can have a certain pre-bending angle, enabling the doctor to reach the part that needs to be cleaned more smoothly during use.

[0123] As Figure 24 and Figure 25 , which are two specific embodiments. Figure 24 is a schematic diagram of the shape of the syringe needle after heat treatment first, Figure 25 is a schematic diagram of the shape of the syringe needle of another embodiment after heat treatment first.

[0124] 5.2 Perform size reduction processing on the flushing needle tip

[0125] Use wire cutting, electric discharge machining, grinding, and machining methods to process the head end of the heat-treated syringe needle, remove a part of the entity to process the head end of the syringe needle into a water outlet, the head end of the syringe needle becomes a water outlet, and the water outlet faces one side of the syringe needle to form a side flushing port. After processing, the dimensions of each point along the radial direction of the flushing needle tip do not exceed the outer dimensions of the unprocessed section of the syringe needle

[0126] As Figures 26 to 30 , which are schematic diagrams of several specific embodiments. Figure 26 is a schematic diagram of the shape of the syringe needle of an embodiment after heat setting first and then size reduction processing; Figure 27 is a schematic diagram of the shape of the syringe needle of an embodiment after heat setting first and then size reduction processing. Figure 28 is a schematic diagram of the shape of the syringe needle of an embodiment after heat setting first and then size reduction processing. Figure 29 is a schematic diagram of the shape of the syringe needle of an embodiment after heat setting first and then size reduction processing. Figure 30 is a schematic diagram of the shape of the syringe needle of an embodiment after heat setting first and then size reduction processing.

[0127] 6. Surface processing of the flushing needle tube

[0128] Treat the surface of the syringe needle to make its surface bright, and the treatment methods can include grinding, electro-polishing, and acid solution treatment.

[0129] 7. Assembly of the syringe needle and the needle hub

[0130] Assemble and fix the syringe needle of the flushing needle on the needle hub. There are three ways to assemble the needle hub and the syringe needle: assemble a straight syringe needle with a straight needle hub; assemble an angled syringe needle with a straight needle hub; assemble a straight syringe needle with an angled needle hub (see Figure 31 , Figure 32 and Figure 33 ). Figure 31 is a schematic diagram before assembly of the syringe needle and the needle hub in several embodiments. Figure 32 is a schematic diagram after assembly of the syringe needle and the needle hub in several embodiments. Figure 33 is a schematic diagram of the flushing needle's skidding water discharge.

[0131] Since the needle tip of this irrigation needle is made of nitinol alloy, it is convenient for doctors to bend during oral irrigation and is not easy to break. Moreover, due to the flexibility of nitinol alloy itself, it can easily penetrate into any part of the root canal or oral cavity.

[0132] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification. It should be noted that "in one embodiment of the present application", "for example", "again, for example", etc. are intended to illustrate the present application and are not used to limit the present application. The above-described embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An oral irrigation needle, characterized in that, It includes a nickel-titanium alloy tube body, the nickel-titanium alloy tube body has a drawn forming structure, the outer diameter range of the nickel-titanium alloy tube body is 0.20 - 3.5 mm, and the inner diameter range is 0.1 - 3.3 mm; the length of the nickel-titanium alloy tube body is 10 - 70 mm; one end of the nickel-titanium alloy tube body is formed with a notch, the notch communicates with the inner hole of the nickel-titanium alloy tube body, and the notch penetrates through the end of one end of the nickel-titanium alloy tube body. The residual wall of the nickel-titanium alloy tube body at the notch position forms a stamping needle wall, and the end of the stamping needle wall warps towards the notch position to form a guiding wall.

2. The oral irrigation needle according to claim 1, wherein The guiding wall has an arc-shaped structure.

3. The oral irrigation needle according to claim 1, wherein The guiding wall has a U-shaped structure.

4. The oral irrigation needle according to claim 1, wherein, The length of the notch in the length direction of the nickel-titanium alloy tube body is 0.5 - 10 mm.

5. The oral irrigation needle according to claim 1, characterized in that, The solid surface area of the residual wall forming the stamping needle wall accounts for 1 / 5 - 3 / 5 of the solid surface area of the nickel-titanium alloy tube body wall before the notch position is formed.

6. The oral irrigation needle according to claim 1, characterized in that, The dimensions of the guiding wall at each point in the radial direction of the nickel-titanium alloy tube body do not exceed the outer dimensions of the nickel-titanium alloy tube body at the notch position.

7. The oral irrigation needle according to claim 1, wherein, The solid surface area of the residual wall forming the stamping needle wall accounts for 1 / 4 - 1 / 3 of the solid surface area of the nickel-titanium alloy tube body wall before the notch position is formed.

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