High degree of freedom connecting structure of root canal irrigator irrigating needle and irrigating method

Abstract

The application relates to a high-freedom connecting structure of a root canal irrigator and an irrigating method, and belongs to the technical field of root canal treatment equipment. The oscillating needle comprises a needle head, a ball joint and a connecting rod. The connecting rod of the oscillating needle is connected with a spherical groove of an eccentric wheel through the ball joint, and one degree of freedom is reserved. A soft rubber covering head cover is arranged at the top of a shell, and the oscillating needle is arranged in the soft rubber covering head cover through a cylindrical joint, a cylindrical pair is formed, and four degrees of freedom are reserved. Five degrees of freedom are reserved in total. The application has the advantages that the trajectory is self-adaptive, the needle head does not stop after being blocked, and the blocked needle head changes the trajectory adaptively. The high-freedom ball joint and cylindrical joint ensure the safety of the needle head, the oscillating needle is constrained by two connecting rods, has five degrees of freedom, and forms a high-freedom connecting structure at the soft rubber covering head cover. The motor torque is small, and the needle head cannot be stuck. The needle head cannot be broken, and the safety is high. The threaded structure of the needle head is convenient for smearing and throwing medicines.

Description

TECHNICAL FIELD

[0001] The application relates to a high-degree-of-freedom connecting structure of a root canal washing needle of a root canal washing device and a washing method. BACKGROUND

[0002] At present, the root canal treatment oscillator on the market is an ultrasonic oscillator, which has the following disadvantages.

[0003] 1. The needle head of the ultrasonic oscillator is a metal structure, and the needle head stops working when blocked.

[0004] 2. The connecting structure of the needle head of the ultrasonic oscillator is fixed by a pin shaft, and the freedom degree is low, and the X and Y directions of the working plane of the needle head do not have freedom degrees; the needle head is blocked and stopped when blocked in the inner wall of the root canal.

[0005] 3. The needle head of the ultrasonic oscillator is a metal structure, and is easy to break when hitting the inner wall of the root canal. Even if the operator is skilled, the needle head will hit and break due to the movement of the patient's head, for example, the patient's head deviates due to coughing. Moreover, the broken needle is difficult to take out, which brings great inconvenience to the patient and the doctor, and even affects the treatment of the patient, causes physical and mental harm, and has high risk.

[0006] 4. The ultrasonic washing does not have the function of throwing and smearing medicine, and cannot solve the problem of medicine scattering. The needle head needs to be replaced or medicine needs to be applied through other ways, which causes long treatment time and complicated treatment procedure. SUMMARY

[0007] The application aims to provide a high-degree-of-freedom connecting structure of a root canal washing needle of a root canal washing device and a washing method, so as to overcome the shortcomings of the prior art.

[0008] The application is realized by the following technical scheme: an oscillation needle is arranged at the top of a shell, a battery cover is arranged at the bottom of the shell, and a battery compartment is arranged in the shell; the battery cover is screwed on the bottom of the shell; a main control PCB, a motor and a button are further arranged in the shell; the front end of the motor is connected with an eccentric wheel through a motor input shaft; the positive and negative poles of the main control PCB, the motor and the button are connected with a positive pole baffle and a negative pole baffle of the battery compartment through wires.

[0009] The oscillation needle comprises a needle head, a ball joint and a connecting rod; the connecting rod of the oscillation needle is connected with the spherical groove of the eccentric wheel through the ball joint to form a spherical pair, and one degree of freedom is reserved.

[0010] A soft rubber covering head cover is further arranged at the top of the shell, and the oscillation needle is further arranged in the soft rubber covering head cover through a cylindrical joint to form a cylindrical pair, and four degrees of freedom are reserved; a total of five degrees of freedom are reserved.

[0011] The needle head has a threaded structure.

[0012] The oscillating needle is arranged in the annular groove of the soft rubber covering head cover through a cylindrical joint, and a sealing ring is further arranged between the cylindrical joint and the annular groove.

[0013] The material of the oscillating needle is a soft rubber or hard rubber plastic material, such as POM, TPE, TPU, PA and the like.

[0014] The oscillating washing method of the present application comprises the following steps:

[0015] Step 1, root canal preparation, to form a tapered opening capable of accommodating the needle;

[0016] Step 2, preparation of a solution for introducing into the root canal, including NaOCL and EDTA;

[0017] Step 3, medicine application, the threads of the needle are immersed in the medicine to adsorb the medicine, and the needle with the medicine is put into the root canal, and the needle has four threads;

[0018] Step 4, treatment, the main machine is started by pressing the button, the needle operates according to an approximate elliptical trajectory, and the medicine in the threads of the needle is evenly applied and scattered on the root canal wall to achieve the purpose of disinfection;

[0019] Step 5, self-adaptation, when the oscillating needle encounters frictional resistance in the root canal, the soft rubber covering head cover deforms at the annular groove to follow the stress of the needle and forms self-adaptation, so that the needle does not stop working;

[0020] Step 6, end of treatment, the button of the oscillating washer is adjusted according to the sensitivity of the patient to adjust the vibration gear, and the treatment is ended after the desired treatment effect is achieved.

[0021] The present application has the advantages that 1. the trajectory is self-adaptive, the needle does not stop working after being blocked, and the needle changes the trajectory adaptively after being blocked; 2. the high degree of freedom of the ball joint and the cylindrical joint ensures the safety of the needle, the oscillating needle has five degrees of freedom through two connection constraints, and a high degree of freedom connection structure is formed at the soft rubber covering head cover; 3. the motor torque is small, and the needle will not be stuck; 4. the needle will not be broken, and the safety is high; 5. the thread structure of the needle is convenient for applying and scattering the medicine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural diagram of the present application.

[0023] Figure 2 It is a sectional view of the present application.

[0024] Figure 3 It is a structure diagram of the oscillating needle.

[0025] Figure 4 It is a degree of freedom schematic diagram.

[0026] Figure 5 This is a structural diagram of Example 2.

[0027] Figure 6 This is a cross-sectional view of Example 2.

[0028] Figure 7 This is a structural diagram of the oscillating needle in Example 2.

[0029] Figure 8 This is a schematic diagram of the oscillating needle trajectory. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 8 The preferred embodiment of the present invention is further described below, including an oscillating needle 2 disposed on the top of the outer casing 1 and a battery cover 13 disposed on the bottom of the outer casing 1, and a battery compartment 14 disposed inside the outer casing 1, with the battery cover 13 screwed onto the bottom of the outer casing 1; the outer casing 1 also includes a main control PCB board 3, a motor 4 and a button 12, the front end of the motor 4 is connected to an eccentric wheel 5 through a motor input shaft 41, and the positive and negative terminals of the main control PCB board 3, the motor 4 and the button 12 are respectively connected to the positive and negative terminals of the battery compartment 14 through wires; the oscillating needle 2 includes a needle tip 23, a ball joint 21 and a connecting rod 22; the connecting rod 22 of the oscillating needle 2 is connected to the spherical groove 51 of the eccentric wheel 5 through the ball joint 21 to form a spherical pair, retaining one degree of freedom;

[0031] The top of the outer shell 1 is also provided with a soft rubber cover 11, and the oscillating needle 2 is also provided inside the soft rubber cover 11 through a cylindrical connector 24 to form a cylindrical pair, retaining four degrees of freedom; a total of five degrees of freedom are retained.

[0032] Specifically, the needle tip 23 of the oscillating needle 2 has only restricted movement freedom in the X and Y directions. The other four degrees of freedom are flexibly connected through the soft rubber covering head cover 11. At the same time, due to its fixed connection with the flexible structure, it is not easy to move in the length direction.

[0033] Its specific principle is as follows Figure 4 As shown: the motor input shaft 41 is connected to the eccentric wheel 5, and the connecting rod 22 is connected to the spherical joint of the eccentric wheel 5, restricting only the movement in the X and Y directions; the other end of the connecting rod 22 is connected to a flexible sealing ring 122, the material having a hardness of approximately Shore A between 30 and 60. Thus, when the motor 4 stops running, the needle 23 will remain in a position where the flexible material is in equilibrium. Once the motor 4 starts, the motor 4 drives the spherical joint of the connecting rod 22 to rotate via the eccentric wheel 5.

[0034] Based on mechanical principles, without the sealing ring 122, the degrees of freedom of the entire mechanism are:

[0035] F = 6n - 5p5 - 4p4 - 3p3 - 2p2 - p1;

[0036] F is the degree of freedom of the mechanism. n is the number of movable components, P5 has only one degree of freedom, P4 has two degrees of freedom, P3 has three degrees of freedom, P2 has four degrees of freedom, and P1 has five degrees of freedom;

[0037] In the present application: F = 6n - 5P5 - 2P2 = 6x2 - 5x1 - 2x1 = 5;

[0038] F is the degree of freedom of the mechanism. n is the number of movable components, n = 2, i.e. the spherical pair and the cylindrical pair. In the present application, only P5 and P2 are present; therefore, the component has five constraints.

[0039] From the calculation results, if there is no flexible material fixation, the entire mechanism still has five degrees of freedom, and after adding the flexible material fixation, if the sealing ring 122 is regarded as a rigid material, the entire mechanism will be locked, or the motor 4 will overcome the deformation of the connecting rod 22 material to operate, and the terminal has no motion output. After replacing the sealing ring 122 with a flexible material, the entire mechanism can easily overcome the flexible material and plastically deform, and the entire mechanism has basically no friction, and no additional noise is generated.

[0040] As shown in Figure 4 , the rigidity of the connecting rod 22 is greater than that of the flexible material sealing ring 122, but the motor 4 can also ignore the rigidity of the connecting rod 22 and deform flexibly; therefore, when the working end of the connecting rod 22 is completely locked, the motor 4 will also continue to operate by overcoming the deformation of the connecting rod 22, and will not transmit excessive working energy to the needle tip end. Thus, the working stress limit of the needle tip is ensured, and the safety of the motor 4 is also protected, thereby prolonging the service life.

[0041] From the above analysis, no matter what kind of extreme condition occurs at the working load end, the entire structure design has added double insurance, which ensures that the needle tip will not be broken and will not occur in the case of exceeding the working load, thereby ensuring the safety of the entire device.

[0042] The needle 23 has a threaded structure.

[0043] The oscillating needle 2 is arranged in the ring groove 121 of the soft rubber covered head cover 11 through the cylindrical joint 24, and the sealing ring 122 is further arranged between the cylindrical joint 24 and the ring groove 121.

[0044] The material of the oscillating needle 2 is a soft or hard rubber plastic material, such as POM, TPE, TPU, PA, etc.

[0045] As shown in Figure 5 , 6 , 7, the needle 23 and the connecting rod 22 are in a plug-in structure, although they are connected in a split type, they should also be regarded as the overall structure of the oscillating needle 2.

[0046] The oscillation method of the present application comprises the following steps:

[0047] Step 1, root canal preparation, to form a conical opening for needle insertion;

[0048] Step 2, preparation of the irrigation solution including NaOCL and EDTA for introduction into the root canal;

[0049] Step 3, drug application, the threads of the needle 23 are immersed in the drug to absorb the drug, and the needle 23 with the drug is placed into the root canal, and the needle 23 is a four-threaded needle;

[0050] Step 4, treatment, the main machine is started by pressing the button 12, the needle 23 moves in an approximately elliptical trajectory, and the drug in the threads of the needle 23 is evenly applied and scattered on the root canal wall to achieve disinfection;

[0051] Step 5, self-adaptation, when the oscillating needle 2 encounters frictional resistance in the root canal, the soft rubber covering cap 11 deforms at the ring groove 121 following the stress of the needle 23, forming self-adaptation and avoiding jamming and shutdown; Figure 8 The movement trajectory of the oscillating needle 2 without resistance;

[0052] Step 6, end of treatment, the button 12 of the oscillation device is adjusted according to the sensitivity of the patient to adjust the vibration gear, and the treatment is ended after the desired treatment effect is achieved.

[0053] The oscillation operation can vertically move the position of the handheld device within a distance of 2 to 3 mm; the medical solution in the root canal is agitated for about 30 to 60 seconds in a fluid dynamics working mode; after irrigation, a suction tube is used to remove loose debris in the tooth root canal; the above operation steps are repeated for each different root canal treatment process.

[0054] If the oscillation device main machine is continuously operated for eight minutes without any operation, or is stopped without any operation, it will enter the system self-protection and shutdown state. If it is necessary to restart, please repeat the above startup steps.

Claims

1. A root canal septic device, characterized in that, It includes an outer casing, an oscillating needle located on the top of the outer casing, a battery cover located on the bottom of the outer casing, and a battery compartment located inside the outer casing; The battery cover screws onto the bottom of the casing; The outer casing also houses a main control PCB board, a motor, an eccentric wheel, and buttons. The front end of the motor is connected to the eccentric wheel via a motor input shaft. The positive and negative terminals of the main control PCB board, motor, and buttons are respectively connected to the positive and negative terminals of the battery compartment via wires. The oscillation needle includes a needle head, a ball joint, a cylindrical joint, and a connecting rod. The connecting rod of the oscillation needle is connected to the spherical groove of the eccentric wheel via a ball joint to form a spherical pair, retaining one degree of freedom. The top of the outer shell is equipped with a soft rubber-covered head cover, and the cylindrical connector of the oscillating needle is set in the annular groove of the soft rubber-covered head cover to form a cylindrical pair, retaining four degrees of freedom; a total of five degrees of freedom are retained. A sealing ring is provided between the cylindrical joint and the annular groove; the sealing ring is made of a flexible material with a Shore hardness of 30 to 60 degrees. One end of the connecting rod is connected to the spherical joint formed by the ball joint and the spherical groove of the eccentric wheel, and the other end of the connecting rod is connected to the sealing ring; the rigidity of the connecting rod is greater than that of the sealing ring. The needle has a threaded structure.

2. The root canal irrigator according to claim 1, characterized in that: The vibrating needle is made of soft rubber or hard plastic material.

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