Intermaxillary traction nail

Abstract

The utility model relates to an intermaxillary traction screw which is provided with a threaded section, a polished rod section, a middle cap part, a connecting rod section and a top cap part from bottom to top, the width of the connecting rod section is smaller than the width of the middle cap part and the width of the top cap part at the two ends, and the middle cap part, the connecting rod section and the top cap part define a groove part for binding a rubber band; the top cap is characterized in that the top cap part is circular, the periphery of the top surface of the top cap part is in smooth transition, the peripheral wall of the middle cap part is formed by alternately connecting a plurality of plane sections and cambered surface sections, and one cambered surface section is arranged between every two adjacent plane sections. The polygonal part for screwing the traction nail is arranged on the middle cap part, so that the traction nail can be screwed by a hand tool; the top cap portion is designed to be round, the periphery of the top face of the top cap portion is in smooth transition, and the top cap portion is located at the outermost end during operation, so that the discomfort of friction between the traction nail in the mouth of a patient and oral mucosa tissue is effectively reduced, and the minimum oral mucosa friction irritation is achieved.

Description

Technical Field

[0001] The utility model relates to a medical fixing nail, in particular to an inter-maxillary traction nail used in surgeries related to occlusal relationships. Background Art

[0002] When patients undergo occlusal surgery, such as orthognathic surgery, facial fracture surgery, and temporomandibular joint tumor surgery, in order to maintain a stable occlusal relationship, an intermaxillary ligature is required to temporarily fix the upper and lower jaws together. At this time, an intermaxillary ligature pin is used as a support for the ligature force. Specifically, a rubber band is used to tie the traction pins on the upper and lower jaws together.

[0003] For example, a Chinese utility model patent application with patent number CN202022393674.6 (publication number CN213552251U) discloses a "traction nail for intermaxillary ligation," comprising a nail body, a connecting rod, and a nail head. The nail body is connected to the nail head via the connecting rod; the nail body includes a traction plate and a threaded portion, and the traction plate is connected to the nail head via the connecting rod. The width of the connecting rod is smaller than the width of the nail head and the traction plate at both ends, and the connecting rod, nail head, and traction plate form a groove structure. The nail body has a threaded portion with threads. This traction nail ensures that the thread is not too long to accommodate Asians, but also prevents the traction nail from losing its engagement due to thread size adjustment and preventing it from being embedded in soft tissue due to an undersized nut.

[0004] During the operation, the nail head is exposed on the outside and will come into friction contact with the lips of the mouth. However, the nail head in the aforementioned patent is polygonal in shape to facilitate twisting with hand tools, and the surface of the nail head is not smooth enough. The traction screw in the patient's mouth rubs against the mucosal tissue of the lips, causing obvious discomfort. In addition, there is no obstruction on the surface of the groove structure for tying the rubber band (or tying rope), which makes the rubber band (or tying rope) at risk of falling out of the groove. Utility Model Content

[0005] The first technical problem to be solved by the present invention is to provide an intermaxillary traction nail with a reasonable structure and reduced friction discomfort between the traction nail and the mucosal tissue in the patient's mouth in response to the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide an intermandibular traction nail which can effectively prevent the rubber band (or tie rope) from being separated in view of the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an intermaxillary traction screw, which has a threaded section, a smooth rod section, an intermediate cap section, a connecting rod section, and a top cap section from bottom to top, the width of the connecting rod section is smaller than the width of the intermediate cap section and the top cap section at both ends, and the intermediate cap section, the connecting rod section, and the top cap section form a groove section for rubber band binding; it is characterized in that: the top cap section is circular, the peripheral edge of the top surface of the top cap section is smoothly transitioned, the peripheral wall of the intermediate cap section is formed by alternating multiple plane sections and multiple arc surface sections, and an arc surface section is arranged between two adjacent plane sections.

[0008] As an improvement, the top surface of the cap portion is an arched spherical surface. This makes the top surface of the cap portion similar to a fluid surface, further reducing the friction of the cap portion on the oral mucosa.

[0009] As a further improvement, the bottom periphery of the cap portion also presents a smooth transition, further reducing the friction of the cap portion on the oral mucosa.

[0010] As a further optimization, the connection between the connecting rod section, the middle cap section, and the top cap section is rounded, with a radius of 0.1 to 0.3 mm, preferably 0.2 mm. The rounded connection between the connecting rod section, the middle cap section, and the top cap section provides a smooth transition to the inner edge of the groove section, thereby better preventing the rubber band hung in the groove section from being worn by the inner edge of the groove section.

[0011] As an improvement, the first thickness of the top cap is smaller than the second thickness of the middle cap. The smaller the thickness of the top cap, the less contact it has with the oral mucosa. The middle cap is preferably thicker because it needs to cooperate with hand tools.

[0012] As an improvement, the connection between the polished rod section and the top cap portion is rounded, and the radius of the rounding is 0.2 to 0.4 mm, preferably 0.3 mm.

[0013] As a further improvement, the middle cap is provided with two radially penetrating holes, which are cross-connected and arranged so as to allow steel wire to be passed through the holes and used for tying traction nails.

[0014] To address the aforementioned technical issues with the second rod, a further improvement has been made. The bottom surface of the top cap is provided with at least two circumferentially spaced protrusions extending toward the middle cap. Each protrusion is less than half the height of the groove. When the rubber band is inserted into the groove, the protrusions block the band, preventing it from slipping out of the groove during manipulation during surgery.

[0015] As a structural manner of forming the convex stop portion, the convex stop portion and the top cap portion are integrally formed, or an independent component of the convex stop portion is welded to the bottom surface of the top cap portion.

[0016] As a second structural formation method of the convex stop portion, the top cap portion and the connecting rod section are provided with slots extending therethrough, a bayonet is inserted into and welded into the slot, and the convex stop portion is provided at both ends of the bayonet.

[0017] As a third structural method of forming the convex stop portion, the top cap portion and the connecting rod segment are plugged into each other and fixed by welding.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. It changes the design of traditional intermaxillary traction pins by setting the polygonal part used to screw the traction pin on the middle cap, ensuring that the traction pin can be screwed with hand tools; the top cap is designed to be circular, and the top edge of the top cap has a smooth transition. During surgery, the top cap is located at the outermost end, which effectively reduces the friction discomfort between the traction pin and the oral mucosal tissue in the patient's mouth and minimizes friction irritation to the oral mucosa.

[0020] 2. The peripheral wall of the middle cap is composed of multiple plane segments and arc segments connected alternately. An arc segment is set between two adjacent plane segments. The setting of the plane segment allows the middle cap to be used with hand tools to screw the screws. The setting of the arc segment makes the corners of the middle cap smooth, reducing friction with the mucosa. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional schematic diagram of the first embodiment of the utility model;

[0022] Figure 2 It is a front view of the first embodiment of the utility model;

[0023] Figure 3 A top view of the first embodiment of the present utility model;

[0024] Figure 4 This is a perspective schematic diagram of a second embodiment of the utility model;

[0025] Figure 5 It is a front view of the second embodiment of the utility model;

[0026] Figure 6 It is a front view of the third embodiment of the utility model;

[0027] Figure 7 A partial cross-sectional view of a third embodiment of the present utility model;

[0028] Figure 8 This is a perspective schematic diagram of a fourth embodiment of the present utility model;

[0029] Figure 9 Reference diagram for clinical use of intermaxillary traction pins. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 3 Shown is the first embodiment of the present utility model.

[0032] An intermaxillary traction nail comprises, from bottom to top, a threaded section 1, a polished rod section 2, an intermediate cap section 3, a connecting rod section 4, and a top cap section 5, all connected together. The overall length of the intermaxillary traction nail is 10 mm. The first thickness h1 of the top cap section 5 is less than the second thickness h2 of the intermediate cap section 3. The polished rod section 2 is preferably 1.5 mm or 1.6 mm. The width of the connecting rod section 4 is less than the width of the intermediate cap sections 3 and the top cap sections 5 at either end. The intermediate cap section 3, connecting rod section 4, and top cap section 5 form a groove 6 for tying a rubber band.

[0033] The unique features of this utility model are: the top cap portion 5 is circular, the top surface 5a of the top cap portion 5 is a domed spherical surface, the periphery of the top surface 5a of the top cap portion 5 is smoothly rounded, and the peripheral wall of the middle cap portion 3 is composed of four planar segments 3a and four arcuate segments 3b alternately connected, with one arcuate segment 3b being provided between every two adjacent planar segments 3a.

[0034] Of course, the periphery of the bottom surface 5b of the top cap portion 5 may also be a smooth transition or a flat surface.

[0035] The joints 6a between the connecting rod section 4, the middle cap portion 3 and the top cap portion 5 are all rounded, and the radius of the rounding is 0.2 mm.

[0036] The middle cap portion 3 is provided with two radially penetrating through-holes 7 , and the two through-holes 7 are interconnected in a cross-like manner.

[0037] like Figures 4-5 FIG. 2 shows a second embodiment of the present utility model.

[0038] The difference between this embodiment and the first embodiment is that the bottom surface of the top cap portion 5 is provided with four convex stops 8 extending toward the middle cap portion 3 and evenly spaced along the circumference, and the height of each convex stop 8 is less than half the height of the groove portion 6.

[0039] The convex stop portion 8 is integrally formed with the top cap portion, or the convex stop portion 8 is an independent component welded to the bottom surface of the top cap portion 5 .

[0040] like Figures 6-7 FIG. 2 shows a third embodiment of the present utility model.

[0041] The difference between this embodiment and the second embodiment is that a slot 9 is formed in the top cap portion 5 and the connecting rod segment 4 , a bayonet pin 10 is inserted into and welded into the slot 9 , and the convex stop portions 8 are provided at both ends of the bayonet pin 10 .

[0042] like Figure 8 FIG. 2 shows a fourth embodiment of the present utility model.

[0043] The difference between this embodiment and the second embodiment is that the top cap portion 5 and the connecting rod segment 4 are plugged into each other and fixed by welding.

[0044] like Figure 9 As shown, the aforementioned intermaxillary distraction pin is used in a surgical procedure similar to existing distraction pins. Multiple distraction pins are fixed to the upper alveolar bone, each spaced apart. Multiple distraction pins are fixed to the lower alveolar bone, each spaced apart. The distraction pins on the upper and lower alveolar bones are positioned one-to-one. A rubber band is used to tie the two corresponding distraction pins together, with the rubber band wrapped around the groove 6 to secure the connection. When the rubber band is inserted into the groove 6, the convex stop 8 blocks the rubber band, preventing it from slipping out of the groove 6 during operation.

[0045] It changes the design of traditional intermaxillary traction nails, and sets the polygonal part for screwing the traction nail on the middle cap part 3. The top cap part 5 is designed to be circular, and the periphery of the top surface of the top cap part 5 is smoothly transitioned. Under the premise of ensuring that the traction nail is screwed with hand tools, it effectively reduces the friction discomfort between the traction nail and the oral mucosal tissue in the patient's mouth, and has minimal friction irritation to the oral mucosa.

[0046] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "up, down", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An intermaxillary traction nail, comprising, from bottom to top, a threaded section (1), a polished rod section (2), an intermediate cap section (3), a connecting rod section (4), and a top cap section (5), wherein the width of the connecting rod section (4) is smaller than the widths of the intermediate cap sections (3) and the top cap sections (5) at both ends, and the intermediate cap section (3), the connecting rod section (4), and the top cap section (5) form a groove section (6) for tying a rubber band; characterized in that: The top cap portion (5) is circular, and the periphery of the top surface (5a) of the top cap portion (5) is smoothly transitioned. The peripheral wall of the intermediate cap portion (3) is formed by alternatingly connecting a plurality of plane segments (3a) and a plurality of arcuate segments (3b), and one arcuate segment (3b) is provided between two adjacent plane segments (3a).

2. The intermaxillary traction nail according to claim 1, characterized in that: The top surface (5a) of the top cap portion (5) is an arched spherical surface.

3. The intermaxillary traction nail according to claim 1, characterized in that: The periphery of the bottom surface (5b) of the top cap portion (5) also presents a smooth transition.

4. The intermaxillary traction nail according to claim 1, characterized in that: The connection points (6a) between the connecting rod section (4), the middle cap portion (3) and the top cap portion (5) are all rounded, and the rounding radius is 0.1 to 0.3 mm.

5. The intermaxillary traction nail according to claim 1, characterized in that: The first thickness (h1) of the top cap portion (5) is smaller than the second thickness (h2) of the middle cap portion (3).

6. The intermaxillary traction nail according to claim 1, characterized in that: The middle cap portion (3) is provided with two radially penetrating through-holes (7), and the two through-holes (7) are interconnected in a cross-like manner.

7. The intermaxillary traction nail according to claim 1, characterized in that: The bottom surface of the top cap portion (5) is provided with at least two convex stop portions (8) extending toward the middle cap portion (3) and arranged at intervals along the circumference, and the height of each convex stop portion (8) is less than half the height of the groove portion (6).

8. The intermaxillary traction nail according to claim 7, characterized in that: The convex stop portion (8) is integrally formed with the top cap portion, or the convex stop portion (8) is an independent component welded to the bottom surface of the top cap portion (5).

9. The intermaxillary traction nail according to claim 7, characterized in that: The top cap portion (5) and the connecting rod section (4) are provided with a slot (9) extending therethrough, a bayonet (10) is inserted into and welded into the slot (9), and the convex stop portion (8) is provided at both ends of the bayonet (10).

10. The intermaxillary traction nail according to claim 7, characterized in that: The top cap portion (5) and the connecting rod section (4) are plugged into each other and fixed by welding.

Images