Protective cap for a composite abutment

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, concretely relates to a protection cap of composite base, including cap body and fastening bolt, the bolt cap portion of fastening bolt is located in the counterbore groove of cap body one end, the screw rod department activity is passed through the through -hole of cap body and is drawn out from the other end of cap body, be provided with rotary switching structure in the counterbore groove, the limiting protrusion of bolt cap portion is provided with the axial through rotary switching structure, the limiting protrusion and the limiting portion circumferential abut of rotary switching structure. The counterbore groove of cap body one end is provided with rotary switching structure, and the limiting portion and the movable portion two regions are arranged axially, and along with the change of fastening bolt in axial position, the limiting protrusion arranged on the side camber surface switches between two regions.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a protective cap for a composite base. Background Technology

[0002] The composite abutment protective cap, a temporary component used in multi-tooth, full-mouth, aesthetic zone, and personalized restoration procedures, consists of the cap body and the cap screw. It serves as an intermediate structure connecting the implant and the superstructure, primarily protecting the composite abutment. For example, after a second-stage surgery (exposing the implant), it temporarily covers the abutment until the permanent restoration is in place, preventing contamination or mechanical damage to the abutment before restoration completion and preventing food debris and bacteria from entering the abutment's internal channels. It also helps maintain gingival contour, ensuring stable gingival morphology during the healing period and providing an ideal soft tissue environment for subsequent restorations (such as crowns). When installing the composite abutment protective cap, healthcare professionals must place the cap body at the abutment mating point and connect the cap screw using a Torx screwdriver, securing it to the abutment through the screw channel in the cap body to ensure stability and prevent detachment.

[0003] Patent CN222467147U discloses an abutment protective cap and implant assembly. The abutment protective cap covers a connecting boss on an abutment. The connecting boss has a mounting hole with an internal thread on its inner peripheral wall. The abutment protective cap includes a cap body and a connecting rod. The cap body has an open receiving cavity. The connecting rod is located on the bottom wall of the receiving cavity facing the opening, and its outer peripheral wall has an external thread for screwing into the internal thread of the abutment. This invention reduces the risk of medical accidents.

[0004] In the above solution, although the base protection cap can be directly screwed onto the base without the need for additional screws to fix the base protection cap and the base, thus avoiding the possibility of screws falling into the patient's mouth and causing medical accidents during dental surgery, the connecting rod can only be rotated with a special screwdriver. Furthermore, auxiliary tools are needed to straighten the protection cap to ensure the connecting rod accurately enters the thread, making the operation quite complex and prone to errors. Utility Model Content

[0005] The purpose of this invention is to provide a protective cap for a composite base that can solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The protective cap of the composite base includes a cap body and a fastening bolt. The bolt head abuts against a countersunk groove at one end of the cap body, and the bolt part extends out from the other end of the cap body through a through hole. A rotation switching structure is provided in the countersunk groove. The bolt head is provided with a limiting protrusion that can pass axially through the rotation switching structure. The limiting protrusion abuts circumferentially against the limiting part of the rotation switching structure.

[0008] In the protective cap of the composite base, the rotation switching structure includes a polygonal opening of a limiting part and a circular opening of a movable part that are connected. The polygonal opening is located near the opening of the countersunk groove, and the circular opening is located inside the countersunk groove.

[0009] In the protective cap of the composite base, the diameter of the circular opening is greater than the distance from the limiting protrusion to the axis, allowing the limiting protrusion to rotate circumferentially therein.

[0010] In the protective cap of the composite base, the polygonal opening and the limiting protrusion are similar in shape and size, and their sides abut against each other when they rotate circumferentially.

[0011] In the protective cap of the composite base, a guide rounded corner is provided at the junction of the polygonal through-hole and the circular through-hole, so that the limiting protrusion is aligned with the outline of the polygonal through-hole through the guide rounded corner.

[0012] In the protective cap of the composite base, a limiting thread is provided on the inner wall of the through hole, which can cooperate with the screw part. The smooth rod part between the screw part and the cap part corresponds circumferentially to the limiting thread and is clearance-fitted with the limiting thread.

[0013] In the protective cap of the composite base, when the thread of the screw portion near the end of the plug portion engages with the limiting thread, the limiting protrusion is outside the countersunk groove.

[0014] In the protective cap of the composite base, when the limiting thread is located at the smooth rod portion, the limiting protrusion abuts against the limiting portion circumferentially.

[0015] In the protective cap of the composite base, the end face of the cap portion is provided with a screwdriver groove, which includes a straight wall section starting from the end face and a tightening section from the straight wall section to the bottom of the groove.

[0016] In the protective cap of the composite base, the straight wall section is provided with a snap-fit ​​protrusion that rises toward the axis.

[0017] The advantages of this utility model are:

[0018] A rotating switching structure is set in the countersunk groove at one end of the cap body. The structure has two areas arranged axially: a restricting part and a movable part. As the axial position of the fastening bolt changes, the restricting protrusion on its side arc surface switches between the two areas. When the restricting protrusion enters the restricting part, the fastening bolt is restricted circumferentially and cannot rotate relative to the cap body. Therefore, the operator can directly rotate the cap body to screw the fastening bolt into the threaded hole of the base, and then tighten it with a screwdriver. This greatly reduces the difficulty of aligning the fastening bolt and screwing it into the threaded hole. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the cap structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the fastening bolt structure of this utility model.

[0023] In the diagram, there are: cap body 1, through hole 11, limiting thread 12, fastening bolt 2, bolt cap part 21, screw part 22, countersunk groove 23, limiting protrusion 24, smooth rod part 25, screwdriver groove 26, snap-fit ​​protrusion 27, polygonal through hole 31, circular through hole 32, and guide fillet 33. Detailed Implementation

[0024] The following are specific embodiments of the utility model, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the utility model. However, the utility model is not limited to these embodiments.

[0025] like Figures 1-4 As shown, the protective cap of the composite base includes a cap body 1 and a fastening bolt 2. The bolt cap 21 abuts against the countersunk groove 23 at one end of the cap body 1. The screw part 22 extends from the other end of the cap body 1 through the through hole 11 opened in the cap body 1. A rotation switching structure is provided in the countersunk groove 23. The bolt cap 21 is provided with a limiting protrusion 24 that can pass axially through the rotation switching structure. The limiting protrusion 24 abuts circumferentially against the limiting part of the rotation switching structure.

[0026] That is, the protective cap made of titanium alloy has a rotating switching structure in the countersunk groove at one end of the cap body. The structure has two areas arranged axially: a restricting part and a movable part. As the fastening bolt changes in axial position, the restricting protrusion on its side arc surface switches between the two areas. When the groove of the cap body 1 is engaged with the protrusion of the base, the fastening bolt 2 is pushed up and the restricting protrusion just enters the restricting part. The fastening bolt is restricted in the circumferential direction and cannot rotate relative to the cap body. Therefore, the operator can directly rotate the cap body to screw the fastening bolt into the threaded hole of the base, and then tighten it with a screwdriver. This greatly reduces the difficulty of aligning the fastening bolt and screwing it into the threaded hole.

[0027] In this embodiment, the rotation switching structure includes a polygonal opening 31 of the limiting part and a circular opening 32 of the movable part. The polygonal opening 31 is located near the opening of the countersunk groove 23, and the circular opening 32 is located inside the countersunk groove 23.

[0028] The polygonal through-hole 31 is located on the outer side. When the fastening bolt 2 is not yet screwed into the screw hole of the base and is lifted up, the limiting protrusion 24 just enters the limiting part and matches the polygonal through-hole 31. The circular through-hole 32 is located on the inner side. When the fastening bolt 2 has already made a preliminary connection with the screw hole of the base, the fastening bolt 2 is relatively deeper into the through hole 11. The limiting protrusion 24 moves into the circular through-hole 32 of the movable part and can be freely rotated and further screwed into the screw hole of the base by a screwdriver.

[0029] In this embodiment, the diameter of the circular opening 32 is greater than the distance from the limiting protrusion 24 to the axis, so that the limiting protrusion 24 can rotate circumferentially therein.

[0030] When the limiting protrusion 24 enters the circular opening 32 of the movable part, since the diameter of the circular opening 32 is larger than that of the limiting protrusion 24, the fastening bolt 2 will not be blocked in the circumferential direction and can be freely screwed into or out of the screw hole of the base.

[0031] In this embodiment, the polygonal opening 31 and the limiting protrusion 24 are similar in shape and size, and their sides abut against each other when they rotate circumferentially.

[0032] When the limiting protrusion 24 is in the polygonal opening 31 of the limiting part, the polygonal opening 31 and the limiting protrusion 24 are engaged. Rotating the cap 1 can drive the fastening bolt 2 into the screw hole of the base. As the fastening bolt 2 gradually enters the screw hole, the limiting protrusion 24 also separates from the polygonal opening 31 and moves into the circular opening 32. Therefore, the fastening bolt 2 can no longer be controlled by rotating the cap 1.

[0033] In this embodiment, a guide rounded corner 33 is provided at the junction of the polygonal opening 31 and the circular opening 32, so that the limiting protrusion 24 is aligned with the outline of the polygonal opening 31 through the guide rounded corner 33.

[0034] The limiting protrusion 24 that rotates with the fastening bolt 2 may not be able to match the angle of the polygonal through-hole 31 before entering the limiting part. Therefore, a guide fillet 33 needs to be opened at the junction of the polygonal through-hole 31 and the circular through-hole 32 so that the rotation angle can be adjusted with the guide fillet 33 to align with the polygonal through-hole 31 when the fastening bolt 2 is lifted by the base.

[0035] In this embodiment, a limiting thread 12 that can cooperate with the screw portion 22 is provided on the inner wall of the through hole 11. The smooth rod portion 25 between the screw portion 22 and the cap portion 21 corresponds to the limiting thread 12 in the circumference and is clearance-fitted with the limiting thread 12.

[0036] To prevent the fastening bolt 2 from accidentally falling out of the cap 1, a limiting thread 12 is provided on the inner wall of the through hole 11, so that the fastening bolt 2 is locked in the through hole 11 by the thread, and a smooth part 25 is left on the screw to correspond to the limiting thread 12, so that the fastening bolt 2 still has a certain axial movement space.

[0037] In this embodiment, when the thread of the screw portion 22 near the end of the cap portion 21 engages with the limiting thread 12, the limiting protrusion 24 is outside the countersunk groove 23.

[0038] That is, when it is necessary to remove the fastening bolt 2 from the cap 1, the fastening bolt 2 is pushed axially so that the near end thread of the bolt contacts the limiting thread 12. At this time, the limiting protrusion 24 on the bolt cap 21 is pushed out of the countersunk groove 23 and will no longer be obstructed by the polygonal through-hole 31. The fastening bolt 2 can be removed by simply rotating the screwdriver in the opposite direction.

[0039] In this embodiment, when the limiting thread 12 is in the smooth rod portion 25, the limiting protrusion 24 abuts against the limiting portion circumferentially.

[0040] The axial length of the smooth rod 25 is greater than the axial span of the rotary switching structure. While ensuring that the fastening bolt 2 will not fall out of the cap 1, it can also have a certain range of axial movement in the through hole 11, so that the limiting protrusion 24 can switch back and forth between the limiting part and the movable part.

[0041] In this embodiment, the end face of the cap portion 21 is provided with a screwdriver groove 26, which includes a straight wall section starting from the end face and a tightening section from the straight wall section to the bottom of the groove.

[0042] Since the threaded portion of the fastening bolt 2 needs to be brought close to the limiting thread 12 when removing the fastening bolt 2, the screwdriver groove 26 is designed with the bottom wall of the groove opening in an inward-curving shape, so that the end of the screwdriver is squeezed against the groove wall of the curving section to form a clamping state. After clamping, the fastening bolt 2 can be pulled out to the countersunk groove 23 by the screwdriver to a certain distance, ensuring that the screw part 22 is engaged with the limiting thread 12, so as to achieve the effect of unscrewing the fastening bolt 2 out of the through hole 11.

[0043] In this embodiment, a snap-fit ​​protrusion 27 that rises toward the axis is provided on the straight wall section.

[0044] In order to better connect the screwdriver end with the screwdriver groove 26 to drive the fastening bolt 2, the snap-fit ​​protrusions 27 are distributed in a ring on the straight wall section. The snap-fit ​​protrusions 27 abut against the arc surface of the screwdriver in a circumferential direction, so that the fastening bolt 2 can be more firmly snapped into the end of the screwdriver. This not only makes it easier to remove the fastening bolt 2, but also allows the fastening bolt 2 to be taken out with the screwdriver when space is limited.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A protective cap for a composite base, comprising a cap body (1) and a fastening bolt (2), wherein the bolt cap (21) abuts against a countersunk groove (23) at one end of the cap body (1), and the bolt (22) extends from the other end of the cap body (1) through a through hole (11) opened in the cap body (1), characterized in that, The countersunk groove (23) is provided with a rotary switching structure, and the cap part (21) is provided with a limiting protrusion (24) that can pass through the rotary switching structure axially. The limiting protrusion (24) abuts against the limiting part of the rotary switching structure circumferentially.

2. The protective cap of the composite base according to claim 1, characterized in that, The rotation switching structure includes a polygonal opening (31) of the limiting part and a circular opening (32) of the free part connected together. The polygonal opening (31) is located near the opening of the countersunk groove (23), and the circular opening (32) is located inside the countersunk groove (23).

3. The protective cap of the composite base according to claim 2, characterized in that, The diameter of the circular opening (32) is greater than the distance from the limiting protrusion (24) to the axis, so that the limiting protrusion (24) can rotate circumferentially therein.

4. The protective cap of the composite base according to claim 2, characterized in that, The polygonal opening (31) and the limiting protrusion (24) are similar in shape and size, and their sides abut against each other when they rotate circumferentially.

5. The protective cap of the composite base according to claim 2, characterized in that, A guide fillet (33) is provided at the junction of the polygonal opening (31) and the circular opening (32) so that the limiting protrusion (24) is aligned with the outline of the polygonal opening (31) through the guide fillet (33).

6. The protective cap of the composite base according to claim 1, characterized in that, The inner wall of the through hole (11) is provided with a limiting thread (12) that can cooperate with the screw part (22). The smooth rod part (25) between the screw part (22) and the cap part (21) corresponds to the limiting thread (12) in the circumferential direction and is in clearance fit with the limiting thread (12).

7. The protective cap of the composite base according to claim 6, characterized in that, When the thread of the screw part (22) near the end of the cap part (21) engages with the limiting thread (12), the limiting protrusion (24) is outside the countersunk groove (23).

8. The protective cap of the composite base according to claim 6, characterized in that, When the limiting thread (12) is located on the smooth rod portion (25), the limiting protrusion (24) abuts against the limiting portion circumferentially.

9. The protective cap of the composite base according to claim 1, characterized in that, The end face of the cap (21) is provided with a screwdriver groove (26), which includes a straight wall section starting from the end face and a tightening section from the straight wall section to the bottom of the groove.

10. The protective cap of the composite base according to claim 9, characterized in that, The straight wall section is provided with a snap-fit ​​protrusion (27) that rises toward the axis.

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