Local anesthesia device for oral cavity

Abstract

The invention discloses a local anesthesia device for an oral cavity, and relates to the technical field of medical auxiliary appliances, the appearance shape of a needle makes people fear, and the exposed needle focuses on the pain caused by the needle during injection, so that the pain is increased. The invention provides a local anesthesia device for an oral cavity, and the local anesthesia device for the oral cavity comprises a liquid pushing structure which comprises a liquid medicine containing tube and an operation tube which are connected in the axial direction; and the injection structure is arranged at the other end of the liquid medicine containing tube and comprises a telescopic needle head. Visual fear of a patient can be relieved by designing a shielding needle head structure, anxiety is reduced, treatment compliance is improved, and operation risks are reduced; meanwhile, the liquid pushing assembly is designed, so that medical staff can conveniently operate with one hand.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary appliances, and in particular to a local anesthesia device for oral cavity. Background Art

[0002] Oral anesthesia is one of the most important basic operations in dentistry and is an essential technique for completing extraoral and intraoral restorations. Currently, the syringes used by medical staff for oral anesthesia are still ordinary syringes, which include a syringe barrel, a pull rod piston, and a needle. When performing oral anesthesia on patients, medical staff need to hold the mouth mirror in one hand and the syringe in the other. With this ordinary syringe structure, medical staff need to adjust their hand to the push-pull rod after inserting the needle in order to inject the medicine. This push-pull rod type is prone to the problem of over-rapid injection, leading to medical accidents.

[0003] Long-standing syringe usage has led to the notion that needles are invasive and painful, instilling fear and a natural resistance to injections. Even if adults appear cooperative, they can still experience psychological stress and even become needle-sick. Children, naturally conditioned to resist injections, are even more resistant. Forced injections can be psychologically traumatic and even lead to failed injections. Furthermore, the exposed needle can focus attention on the pain, exacerbating it. Consequently, parents often instruct their children to cover their eyes during injections, a highly inconvenient practice. Summary of the Invention

[0004] In response to the above-mentioned problems, the present invention aims to provide a local anesthesia device for oral cavity, which can be designed with a shielding needle structure to alleviate patients' visual fear, reduce anxiety, improve treatment compliance, and reduce operational risks; at the same time, a liquid pushing component is designed to facilitate one-handed operation by medical staff.

[0005] The main idea of the technical solution adopted by the present invention is as follows: by designing a liquid pushing structure, a piston is arranged in the medicine liquid holding tube, and the side of the medicine liquid holding tube where the piston is arranged is threadedly connected to an operating tube, a slider screw assembly is arranged in the operating tube, one end of the screw is provided with a hexagonal fixed block, the end of the operating tube is rotatably connected to a knob, and the knob is clamped with the hexagonal fixed block. When the knob is turned, the screw rotates synchronously, driving the slider on the screw to move toward the side close to the piston, and the pushing seat integrally connected with the slider can push the piston, thereby pushing the medicine to flow toward the end away from the operating tube; the side of the medicine liquid holding tube away from the piston is clamped with a connecting seat, and the connecting seat is threadedly connected to an injection structure, and the injection structure includes a container The needle seat and the magnetic isolation ring are slidably connected in the accommodating groove inside the accommodating shell. The needle seat is provided with a first magnetic pole, the magnetic isolation ring is provided with a second magnetic pole, and the connecting seat is provided with a second magnetic pole. A spring is provided on the needle tip, and a second magnetic pole is provided on the side of the accommodating groove away from the connecting seat. In the initial state of the injection structure, the elastic force of the spring is greater than the attraction between the first magnetic pole and the second magnetic pole, so the needle tip is in a hidden state and is located inside the accommodating groove; when the injection structure and the connecting seat are installed together, the second magnetic pole on the magnetic isolation ring repels the second magnetic pole on the connecting seat. At this time, the direction is the same as the attraction between the first magnetic pole and the second magnetic pole, and the resultant force is greater than the elastic force of the spring, so the spring is further compressed and the needle tip is exposed.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A local anesthesia device for oral cavity, comprising: The liquid pushing structure includes a liquid containing tube and an operating tube connected in an axial direction; The injection structure is arranged at the other end of the liquid medicine containing tube and includes a retractable needle.

[0007] According to the above technical solution, further: the free end of the operating tube is rotatably connected to a knob, the inner side of the knob is clamped with a fixing block, and the fixing block is located inside the operating tube.

[0008] Through the above technical solution, further: the fixed block is connected to a screw rod, a slider is provided on the screw rod, and the slider is connected to a connecting rod and a pushing seat in sequence.

[0009] Through the above technical solution, further: the screw rod is arranged between the limit seat 1 and the limit seat 2, one end of which passes through the limit seat 1 and is rotatably connected to the limit seat 1, and the other end is rotatably connected to the limit seat 2, and the limit seat 1 and the limit seat 2 are connected to the inner wall of the operating tube.

[0010] Through the above technical solution, further: a guide rod is further provided between the limiting seat 1 and the limiting seat 2, and the guide rod is rotatably connected to the limiting seat 1 and the limiting seat 2.

[0011] According to the above technical solution, further: a piston is slidably connected in the medicine liquid containing tube, and a connecting seat is provided at one end of the medicine liquid containing tube away from the operating tube.

[0012] Through the above technical solution, further: the injection structure includes a containing shell, and the containing shell and the connecting seat are detachably connected.

[0013] Through the above technical solution, further: a receiving groove is opened in the receiving shell, and a needle, a needle seat and a magnetic isolation ring are arranged in the receiving groove and are connected in sequence, and the needle, the needle seat and the magnetic isolation ring are slidably connected in the receiving groove.

[0014] Through the above technical solution, further: a second magnetic pole is provided on the side of the magnetic isolation ring away from the needle seat, and a second magnetic pole is provided on the side of the connecting seat close to the accommodating shell.

[0015] Through the above technical solution, further: a spring is provided on the needle, a first magnetic pole is provided on the side of the needle seat close to the needle, and a second magnetic pole is provided on the inner wall of the accommodating groove away from the connecting seat.

[0016] The beneficial effects of the present invention are: 1. By designing a liquid pushing structure, a piston is set in the liquid medicine holding tube. The side of the liquid medicine holding tube where the piston is set is threadedly connected to the operating tube. A slider screw assembly is set in the operating tube. One end of the screw is provided with a hexagonal fixed block. The end of the operating tube is rotatably connected to a knob. The knob is engaged with the hexagonal fixed block. When the knob is turned, the screw rotates synchronously, driving the slider on the screw to move toward the side close to the piston. The push seat integrally connected to the slider can push the piston, thereby pushing the liquid medicine to flow toward the end away from the operating tube. 2. A connecting seat is clamped on the side of the medicine liquid holding tube away from the piston, and the connecting seat is threadedly connected to the injection structure, and the injection structure includes a holding shell, and a needle seat and a magnetic isolation ring are slidably connected in the holding groove inside the holding shell, a first magnetic pole is provided on the needle seat, a second magnetic pole is provided on the magnetic isolation ring, and a second magnetic pole is provided on the connecting seat. A spring is provided on the needle tip, and a second magnetic pole is provided on the side of the holding groove away from the connecting seat. In the initial state of the injection structure, the elastic force of the spring is greater than the attraction between the first magnetic pole and the second magnetic pole, so the needle tip is in a hidden state and is located inside the holding groove; when the injection structure and the connecting seat are installed together, the second magnetic pole on the magnetic isolation ring repels the second magnetic pole on the connecting seat, and at this time, the direction is the same as the attraction between the first magnetic pole and the second magnetic pole, and the resultant force is greater than the elastic force of the spring, so the spring is further compressed and the needle tip is exposed; 3. The pressure on the needle seat when the liquid flows out, the magnetic attraction between the second magnetic pole on the receiving groove and the first magnetic pole on the needle seat, and the magnetic repulsion between the second magnetic pole on the magnetic isolation ring and the second magnetic pole on the connecting seat, all work together to promote the stability of the needle during operation; 4. On a psychological level, the above-mentioned structural design can alleviate patients' (especially children's) visual fear by shielding the needle, reduce anxiety, improve treatment compliance, and reduce operational risks. It can also improve safety. The needle shielding design reduces the risk of needlestick injuries (approximately 380,000 cases per year worldwide) and blood infection among medical staff, while also reducing cross-contamination. At the same time, it optimizes operation by shortening the length of the exposed needle or improving the mechanical structure, thereby enhancing the clarity of vision and injection accuracy in the narrow space of the oral cavity, making it suitable for complex anesthesia scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front view schematic diagram of the present invention; Figure 3 for Figure 2 Schematic diagram along the AA section; Figure 4 for Figure 3 A magnified schematic diagram of part A; Figure 5 for Figure 3 A magnified schematic diagram of part B; Figure 6 for Figure 3 A magnified schematic diagram of part C; Figure 7 This is a schematic diagram of the three-dimensional structure of the slider-screw rod part of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the slider, the push seat and the connecting rod of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the injection structure of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the connecting seat of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the needle head, needle seat and magnetic isolation ring of the present invention; Figure 12 This is a schematic diagram of the internal three-dimensional structure of the injection structure of the present invention; Figure 13 for Figure 12 A magnified schematic diagram of part A; Wherein: 1. liquid pushing structure; 101. liquid holding tube; 102. connecting seat; 103. piston; 104. operating tube; 105. knob; 106. limit slot; 107. fixing block; 108. limit seat 1; 109. limit seat 2; 110. screw rod; 111. guide rod; 112. slider; 113. push seat; 114. connecting rod; 2. Injection structure; 201. Container shell; 202. Needle; 203. Needle seat; 204. Magnetic isolation ring; 205. First magnetic pole; 206. Second magnetic pole; 207. Spring; 208. Container groove. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] The inventors have found that when medical staff are performing oral anesthesia on patients, they need to hold the mouth mirror in one hand and the syringe in the other hand. For syringes of this ordinary structure, medical staff need to adjust their hands to the push-pull rod after inserting the needle in order to push the medicine. The push-pull rod type is prone to the problem of too-fast injection, leading to medical accidents. In addition, since the long-term use of syringes, people know that the appearance and shape of the needle are aggressive and can cause pain, which makes people feel fear. Due to human instinct, they will resist injections. For adults, even if they cooperate with the injection in behavior, they are still psychologically under the pressure of fear and may even feel needle phobia. For children, due to natural conditioned reflexes, they are more resistant to injections. Forcing a needle to be injected will cause certain psychological trauma to the child and may even cause the injection to fail. In addition, the exposed needle will focus the child's attention on the pain caused by the needle during the injection, which increases the pain. Therefore, parents usually cover their children's eyes when they are getting an injection, but this is very inconvenient. When the knob 105 is turned, the screw rod 110 rotates synchronously, driving the slider 112 on the screw rod 110 to move toward the side close to the piston 103, and the pushing seat 113 integrally connected with the slider 112 can push the piston 103, thereby pushing the liquid medicine to flow toward the end away from the operating tube 104; the side of the liquid medicine holding tube 101 away from the piston 103 is clamped with a connecting seat 102, and the connecting seat 102 is threadedly connected to the injection structure 2, and the injection structure 2 includes a containing shell 20 1. The needle seat 203 and the magnetic isolation ring 204 are slidably connected in the receiving groove 208 inside the receiving shell 201. The needle seat 203 is provided with a first magnetic pole 205, the magnetic isolation ring 204 is provided with a second magnetic pole 206, the connecting seat 102 is provided with a second magnetic pole 206, and the needle head 202 is provided with a spring 207. The second magnetic pole 206 is provided on the side of the receiving groove 208 away from the connecting seat 102. In the initial state of the injection structure 2, the elastic force of the spring 207 is greater than the first magnetic pole The attraction between the first and second magnetic poles 205 and 206 causes the needle 202 to be hidden within the receiving groove 208. When the injection structure 2 is assembled with the connecting base 102, the second magnetic pole 206 on the magnetic isolation ring 204 repels the second magnetic pole 206 on the connecting base 102. This force is in the same direction as the attraction between the first and second magnetic poles 205 and 206, and the resultant force is greater than the elastic force of the spring 207. Therefore, the spring 207 is further compressed, and the needle 202 is exposed. The pressure on the needle base 203 when the liquid medicine flows out, the magnetic attraction between the second magnetic pole 206 on the receiving groove 208 and the first magnetic pole 205 on the needle base 203, and the magnetic repulsion between the second magnetic pole 206 on the magnetic isolation ring 204 and the second magnetic pole 206 on the connecting base 102 jointly promote the stability of the needle 202 during operation.

[0020] Example 1 See Figures 1-12 This application discloses a local anesthesia device for oral administration. The device is designed with a liquid pusher structure 1, comprising a liquid medicine container 101 containing liquid medicine to be injected. A connector 102 is snap-fitted to one end of the device, and a piston 103 is slidably connected to the other end. The piston 103 is located within the liquid medicine container 101 and is sealed by a rubber ring. A connecting hole is provided in the connector 102 to facilitate the outflow of liquid medicine.

[0021] The operating tube 104 is arranged on one side of the liquid medicine containing tube 101 and is close to the piston 103. The liquid medicine containing tube 101 and the operating tube 104 are threadedly connected. A knob 105 is provided at the free end of the operating tube 104, and the knob 105 is rotatably connected to the operating tube 104.

[0022] Operating tube 104 is equipped with a slider 112 and a screw rod 110. The structure includes screw rod 110, which is disposed within operating tube 104 and has a hexagonal fixing block 107 integrally connected to one end of screw rod 110. A hexagonal retaining groove 106 is provided on the side of knob 105 adjacent to screw rod 110. Retaining groove 106 mates with hexagonal fixing block 107 and is coaxial with knob 105. Turning knob 105 drives screw rod 110 to rotate synchronously.

[0023] In order to prevent the screw rod 110 from escaping from the limiting groove 106, a limiting seat 108 and a limiting seat 109 are further designed in the operating tube 104. The limiting seat 108 is arranged on a side close to the hexagonal fixed block 107. The limiting seat 108 is fixedly connected to the inner wall of the operating tube 104. The screw rod 110 and the guide rod 111 are passed through the limiting seat 108. The guide rod 111 is parallel to the axis of the screw rod 110. The limiting seat 109 is fixedly connected to the inner wall of the operating tube 104, and the other ends of the screw rod 110 and the guide rod 111 are both connected to the limiting seat 109. The screw rod 110 passes through the limiting seat 109 and is rotatably connected to the limiting seat 109. The guide rod 111 is fixedly connected to the limiting seat 109, so that the screw rod 110 can rotate in the circumferential direction, thereby preventing the two from axial displacement.

[0024] Sliders 112 are provided on the screw rod 110 and are threadedly connected to the screw rod 110. Connecting rods 114 are fixedly provided on both sides of the slides 112, and the ends of the connecting rods 114 are fixedly connected to pusher seats 113. The slides 112 also pass through the guide rods 111, so that the slides 112, the connected connecting rods 114, and the pusher seats 113 can move horizontally to the sides.

[0025] When the knob 105 is turned, the screw rod 110 rotates synchronously, driving the slider 112 on the screw rod 110 to move toward the side close to the piston 103. At the same time, since the slider 112 is integrally connected with the connecting rod 114, the pushing seat 113, and the pushing seat 113, the pushing seat 113 can synchronously push the piston 103, thereby pushing the liquid medicine to flow toward the end away from the operating tube 104.

[0026] Example 2 The connection seat 102 is provided with an injection structure 2 for injecting liquid medicine.

[0027] The injection structure 2 includes a housing 201, which is threadedly connected to the connecting base 102. The housing 201 has a housing groove 208, in which the needle 202, the needle seat 203, and the magnetic isolation ring 204 are slidably connected. The needle 202 and the needle seat 203 are integrally connected, and the magnetic isolation ring 204 is fixedly connected to the needle seat 203. A first magnetic pole 205 is provided on the needle seat 203, and a second magnetic pole 206 is provided on the magnetic isolation ring 204. The first magnetic pole 205 is provided on a side away from the magnetic isolation ring 204, and the second magnetic pole 206 is provided on a side of the needle seat 203. As a result, the first magnetic pole 205 and the second magnetic pole 206 are respectively provided on either side of the magnetic isolation ring 204 to prevent them from interfering with each other. The magnetic isolation ring 204 can be made of 316 stainless steel or other materials that can isolate magnetism.

[0028] The connecting base 102 is provided with a second magnetic pole 206 . When the magnetic isolation ring 204 approaches the connecting base 102 , the magnetic isolation ring 204 is subjected to a repulsive force due to the like-polarity of the magnetic poles.

[0029] A spring 207 is sleeved on the needle 202, and a second magnetic pole 206 is provided on the side of the accommodating groove 208 away from the connecting seat 102. In the initial state of the injection structure 2, since the elastic force of the spring 207 is greater than the attraction between the first magnetic pole 205 and the second magnetic pole 206, the needle 202 is in a hidden state and is located inside the accommodating groove 208; when the injection structure 2 and the connecting seat 102 are installed together, the second magnetic pole 206 on the magnetic isolation ring 204 repels the second magnetic pole 206 on the connecting seat 102. At this time, the resultant force is in the same direction as the attraction between the first magnetic pole 205 and the second magnetic pole 206, and the resultant force is greater than the elastic force of the spring 207. Therefore, the spring 207 is further compressed and the needle 202 is exposed.

[0030] When the second magnetic pole 206 on the receiving slot 208 and the first magnetic pole 205 on the needle seat 203 are close to each other, the closer the distance is, the greater the suction force generated between the second magnetic pole 206 and the first magnetic pole 205 is, and the needle seat 203 can be stably fixed in this position.

[0031] During the injection process, the piston 103 pushes the liquid medicine, causing the liquid medicine to generate thrust on the magnetic isolation ring 204 , thereby improving the stability of the needle 202 and preventing the needle 202 from having an insufficient injection depth.

[0032] The pressure on the needle seat 203 when the drug flows out, the magnetic attraction between the second magnetic pole 206 on the accommodating groove 208 and the first magnetic pole 205 on the needle seat 203, and the magnetic repulsion between the second magnetic pole 206 on the magnetic isolation ring 204 and the second magnetic pole 206 on the connecting seat 102 jointly promote the stability of the needle 202 during operation.

[0033] The use process of the present invention is: 1. First, the operating tube 104 is threadedly connected to the liquid medicine holding tube 101 by rotating the operating tube 104, and then the injection structure 2 and the connecting seat 102 are installed together. In the initial state of the injection structure 2, since the elastic force of the spring 207 is greater than the attraction between the first magnetic pole 205 and the second magnetic pole 206, the needle 202 is in a hidden state and located inside the receiving groove 208; when the injection structure 2 and the connecting seat 102 are installed together, the second magnetic pole 206 on the magnetic isolation ring 204 repels the second magnetic pole 206 on the connecting seat 102. At this time, the direction is the same as the attraction between the first magnetic pole 205 and the second magnetic pole 206, and the resultant force is greater than the elastic force of the spring 207, so the spring 207 is further compressed and the needle 202 is exposed.

[0034] 2. The medical staff holds the patient's mouth open with his left hand, holds the operating tube 104 with his right hand, and presses the right thumb on the knob 105. By turning the thumb, the internal screw rod 110 is driven to rotate. The screw rod 110 rotates synchronously, driving the slider 112 on the screw rod 110 to move toward the side close to the piston 103. The push seat 113 integrally connected to the slider 112 can push the piston 103, thereby pushing the liquid medicine to flow toward the end away from the operating tube 104.

[0035] 3. During step 2, point the needle tip upward to prevent the medicine from flowing out due to gravity. After that, when the medicine emerges from the needle tip, it can be known that the air has been discharged, and the cavity between the magnetic isolation ring 204 and the connecting seat 102 in the receiving groove 208 has been completely filled. During the subsequent injection process, the angle of rotation of the knob 105 corresponds to the moving distance of the piston 103, and the amount of injected medicine can be known based on the moving distance of the piston 103.

[0036] 4. During the injection process, the piston 103 pushes the liquid medicine, causing the liquid medicine to generate thrust on the magnetic isolation ring 204, thereby improving the stability of the needle 202 and avoiding insufficient injection depth of the needle 202.

[0037] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A local anesthesia device for oral cavity, characterized in that: include: The liquid pushing structure (1) comprises a liquid medicine containing tube (101) and an operating tube (104) connected in an axial direction; The injection structure (2) is arranged at the other end of the liquid medicine containing tube (101), and includes a retractable needle (202). Before anesthesia, the needle (202) is stored inside the injection structure (2).

2. The local anesthesia device for oral cavity according to claim 1, characterized in that: The injection structure (2) comprises a containing shell (201), and the containing shell (201) and the connecting seat (102) are detachably connected.

3. The local anesthesia device for oral cavity according to claim 2, characterized in that: A receiving groove (208) is provided in the receiving shell (201), and a needle head (202), a needle seat (203), and a magnetic isolation ring (204) connected in sequence are provided in the receiving groove (208), and the needle head (202), the needle seat (203), and the magnetic isolation ring (204) are slidably connected in the receiving groove (208).

4. The local anesthesia device for oral cavity according to claim 3, characterized in that: A second magnetic pole (206) is provided on the side of the magnetic isolation ring (204) away from the needle seat (203), and a second magnetic pole (206) is provided on the side of the connecting seat (102) close to the accommodating shell (201).

5. The local anesthesia device for oral cavity according to claim 4, characterized in that: A spring (207) is provided on the needle head (202), a first magnetic pole (205) is provided on a side of the needle seat (203) close to the needle head (202), and a second magnetic pole (206) is provided on an inner wall of the accommodating groove (208) away from the connecting seat (102).

6. The local anesthesia device for oral cavity according to claim 5, characterized in that: The free end of the operating tube (104) is rotatably connected to a knob (105), and a fixing block (107) is clamped on the inner side of the knob (105), and the fixing block (107) is located inside the operating tube (104).

7. The local anesthesia device for oral cavity according to claim 6, characterized in that: The fixed block (107) is connected to a screw rod (110), a slider (112) is provided on the screw rod (110), and the slider (112) is sequentially connected to a connecting rod (114) and a pushing seat (113).

8. The local anesthesia device for oral cavity according to claim 7, characterized in that: The screw rod (110) is arranged between the limit seat 1 (108) and the limit seat 2 (109), one end of which is rotatably connected to the limit seat 1 (108), and the other end of which is rotatably connected to the limit seat 2 (109), and the limit seat 1 (108) and the limit seat 2 (109) are connected to the inner wall of the operating tube (104).

9. The local anesthesia device for oral cavity according to claim 8, characterized in that: A guide rod (111) is further provided between the first limiting seat (108) and the second limiting seat (109), and the guide rod (111) is rotatably connected to the first limiting seat (108) and the second limiting seat (109).

10. The local anesthesia device for oral cavity according to claim 9, characterized in that: A piston (103) is slidably connected in the liquid medicine containing tube (101), and a connecting seat (102) is provided at one end of the liquid medicine containing tube (101) away from the operating tube (104).

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