A device for measuring a vertebral body peg

Abstract

The utility model belongs to the medical instrument manufacturing technical field discloses a device for measuring vertebral body nail. Among them including first detection rod and second detection rod, first detection rod one end forms and has first detection end both sides to form first limit surface, first detection end is cylindrical, first detection end diameter is less than the target fracture inner diameter of vertebral body nail, second detection rod one end forms second detection end, second detection end both sides form and have second limit surface, second detection end is cylindrical, second detection end diameter is greater than the target fracture inner diameter of vertebral body nail, solve the problem that the vertebral body nail needs to be destructed sampling detection under the prior art, lead to the problem that part of unqualified product is applied in clinical and leads to the operation failure.

Description

Technical Field

[0001] This utility model relates to the field of medical device manufacturing technology, and in particular to a device for measuring vertebral nails. Background Technology

[0002] As minimally invasive spinal surgery gains increasing clinical importance, vertebral screws are frequently used for reinforcement during the procedure. A vertebral screw is cylindrical, with one half being a stud and the other a notched cylinder. Internal threads are formed on the inner side of the cylinder, with the notch located on opposite sides of the cylinder's curved surface. The internal thread is divided into two segments, separated by a transition section. This transition section projects a circle along the length of the vertebral screw, and its diameter is called the fracture inner diameter. This fracture inner diameter is larger than the major diameter of the internal thread. If the actual fracture inner diameter deviates significantly from the target fracture inner diameter, it cannot be fixed to other medical devices during surgery, ultimately leading to surgical failure.

[0003] Under current technology, the size of the fracture inner diameter needs to be detected by projector inspection. In order to obtain an accurate projection of the fracture inner diameter, the vertebral screw needs to be cut along the fracture inner diameter before inspection. It is necessary to ensure that the actual fracture inner diameter value is within a certain error range of the target fracture inner diameter. However, the cost of building a projector inspection platform is high, and it also damages the vertebral screw, making it unusable. This means that this method can only perform sampling inspection, not individual inspection, which may lead to the continued use of non-compliant vertebral screws, increasing the risk of the surgical procedure. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring vertebral nails, which solves the problem that the existing technology requires destructive sampling inspection of vertebral nails, resulting in the use of some unqualified products in clinical practice and causing surgical failures.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a device for measuring vertebral nails, including a first detection rod and a second detection rod. One end of the first detection rod has a first connecting end, which is cylindrical. The diameter of the first connecting end is smaller than the minor diameter of the internal thread of the vertebral nail. First limiting surfaces are provided on both sides of the first connecting end, and the distance between the first limiting surfaces is smaller than the width of the notch on the vertebral nail. The end of the first connecting end includes a first detection end, which is cylindrical. The diameter of the first detection end is smaller than the inner diameter of the target fracture of the vertebral nail.

[0006] The second detection rod has a second connecting end at one end, which is cylindrical and has a diameter smaller than the minor diameter of the internal thread of the vertebral nail. The second connecting end has second limiting surfaces on both sides, and the distance between the second limiting surfaces is smaller than the width of the notch on the vertebral nail. The end of the second connecting end includes a second detection end, which has second limiting surfaces on both sides. The second detection end is cylindrical and has a diameter larger than the inner diameter of the target fracture of the vertebral nail.

[0007] Preferably, the processing diameter of the first detection end is 9.24 mm to 9.25 mm.

[0008] Preferably, the processing diameter of the second detection end is 9.35 mm to 9.36 mm.

[0009] Preferably, a first gripping end is formed on the first detection rod, the first gripping end is cylindrical, and the first connecting end is installed on one side of the first gripping end.

[0010] Preferably, a second gripping end is formed on the second detection rod, the second gripping end is cylindrical, and a second connecting end is installed on one side of the second gripping end.

[0011] Preferably, the first gripping end and the second gripping end are interconnected, and the first connecting end and the second connecting end are distributed at both ends.

[0012] Preferably, a fixing stud is formed on the first gripping end, and a fixing screw hole is formed on the second gripping end, wherein the fixing stud is screwed into the fixing screw hole.

[0013] Preferably, the first detection rod and the second detection rod are made of metal.

[0014] Beneficial effects: The first and second detection rods are sequentially inserted between the internal threads of the vertebral body screw. Due to the presence of a first limiting surface and a second limiting surface, the first and second connecting ends can directly pass through the internal threads on the vertebral body screw. The first and second detection ends are then inserted into the inner diameter of the fracture surface. The first and second detection rods are rotated. Since the diameter of the first detection end is smaller than the inner diameter of the fracture surface, the first detection rod can rotate freely. However, since the inner diameter of the second detection end is larger than the inner diameter of the fracture surface, the second detection rod cannot rotate freely. By using the first and second detection rods, it is possible to quickly determine whether the actual inner diameter of the fracture surface is within the range of the target inner diameter of the fracture surface. The above detection process does not require damage to the vertebral body screw, and each vertebral body screw can be tested individually, improving the yield rate of the final processed vertebral body screws and reducing surgical risks. Attached Figure Description

[0015] Figure 1This is a connection diagram of the first and second detection rods of this utility model;

[0016] Figure 2 This is an axial view of the first detection end of this utility model;

[0017] Figure 3 This is an axial view of the second detection end of this utility model;

[0018] Figure 4 This is a diagram of the first detection rod of this utility model.

[0019] Figure 5 This is a cross-sectional view of the first detection rod of this utility model.

[0020] In the figure: 1. First detection rod; 11. First connecting end; 12. First limiting surface; 13. First detection end; 14. First gripping end; 2. Second detection rod; 21. Second connecting end; 22. Second limiting surface; 23. Second detection end; 24. Second gripping end; 3. Vertebral nail; 31. Internal thread; 32. Notch; 33. Transition section. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0025] Under current technology, because the vertebral nails need to be destroyed before the fracture diameter is projected, it is impossible to inspect each vertebral nail individually. Therefore, it is impossible to conduct complete inspections and only sampling inspections can be carried out on different production batches. This results in some vertebral nails with unqualified fracture diameters not being inspected, increasing surgical risks. At the same time, the cost of setting up the projection equipment is high, the operation is more complicated, and the projection equipment is also easily affected by external interference.

[0026] To solve the above problems, such as Figures 1 to 5 As shown, this utility model provides a device for measuring vertebral nails, including a first detection rod 1 and a second detection rod 2. One end of the first detection rod 1 has a first connecting end 11, which is cylindrical and has a diameter smaller than the minor diameter of the internal thread 31 of the vertebral nail 3. First limiting surfaces 12 are formed on both sides of the first connecting end 11, and the distance between the first limiting surfaces 12 is smaller than the width of the notch 32 on the vertebral nail 3. The end of the first connecting end 11 includes a first detection end 13, which has first limiting surfaces 12 formed on both sides. The first detection end 13 is cylindrical and its diameter is smaller than the inner diameter of the target fracture surface of the vertebral nail 3. The diameter of the measuring end 13 is larger than the diameter of the first connecting end 11; one end of the second detection rod 2 has a second connecting end 21, which is cylindrical and has a diameter smaller than the minor diameter of the internal thread 31 of the vertebral nail 3. The second connecting end 21 has second limiting surfaces 22 on both sides, and the distance between the second limiting surfaces 22 is smaller than the width of the notch 32 on the vertebral nail 3. The end of the second connecting end 21 includes a second detection end 23, which has second limiting surfaces 22 on both sides. The second detection end 23 is cylindrical and has a diameter larger than the inner diameter of the target fracture of the vertebral nail 3. The diameter of the second detection end 23 is larger than the diameter of the second connecting end 21.

[0027] The inner diameter of the transition section 33 of the internal thread 31 at both ends of the vertebral nail 3 to be measured in this utility model is larger than the minor diameter of the internal thread 31. Therefore, in order to prevent the first detection end 13 and the second detection end 23 from being unable to be inserted along the space inside the internal thread 31, a first limiting surface 12 is provided on both sides of the first detection end 13, and a second limiting surface 22 is provided on both sides of the second detection end 23. Since the distance between the two sets of first limiting surfaces 12 is less than the width of the notch 32, the arc side of the first detection end 13 will be inserted downward along the notch 32. Similarly, the second detection end 23 will also be inserted downward along the notch 32 until the first detection end 13 and the second detection end 23 reach the transition section 33 respectively. At this time, since the diameter of the fracture is larger than the minor diameter of the internal thread 31, the first detection rod 1 and the second detection rod 2 can be rotated to detect whether the inner diameter of the fracture meets the requirements.

[0028] Since the diameter of the first detection end 13 is smaller than the target fracture inner diameter, when the first detection rod 1 can rotate freely, the actual fracture inner diameter meets the minimum design standard. If the first detection rod 1 cannot rotate freely, the fracture inner diameter of the vertebral nail 3 is determined to be too small and cannot meet the requirements, requiring scrapping. Since the diameter of the second detection end 23 is larger than the target fracture inner diameter, when the second detection rod 2 needs to rotate, it cannot rotate due to the large diameter of the second detection end 23. In this case, the actual fracture inner diameter meets the maximum design standard. If the second detection end 23 can rotate freely within the transition section 33, the fracture inner diameter is determined to be too large and does not meet the requirements, requiring scrapping. When the first detection rod 1 rotates freely and the second detection rod 2 cannot rotate, the vertebral nail 3 can be determined to be a usable and qualified product. This method of testing is also convenient, as it does not damage the vertebral nail 3, allowing for individual identification of each vertebral nail 3, thus preventing non-compliant vertebral nail 3 from appearing on the operating table and reducing surgical risks.

[0029] The processing diameter of the first detection end 13 of this utility model is 9.24mm to 9.25mm, that is, the diameter of the first detection end 13 is between 9.24mm and 9.25mm. Therefore, if the size of the fracture diameter needs to be compliant, it needs to be greater than 9.25mm so that the first detection end 13 can rotate freely within the transition section 33.

[0030] Similarly, the machining diameter of the second detection end 23 is 9.35mm to 9.36mm. If the size of the fracture diameter needs to be compliant, it needs to be less than 9.35mm so that the second detection end 23 cannot rotate within the transition section 33.

[0031] A first gripping end 14 is formed on the first detection rod 1. The first gripping end 14 is cylindrical. A first connecting end 11 is installed on one side of the first gripping end 14. If the first gripping end 14 needs to be inserted into the space of the internal thread hole, the diameter of the first gripping end 14 also needs to be smaller than the minor diameter of the internal thread 31 so that the first detection end 13 can reach the designated position.

[0032] The second detection rod 2 has a second gripping end 24 formed on it. The second gripping end 24 is cylindrical. A second connecting end 21 is installed on one side of the second gripping end 24. If the second gripping end 24 needs to be inserted into the space of the internal thread hole, the diameter of the second gripping end 24 also needs to be smaller than the minor diameter of the internal thread 31 so that the second detection end 23 can reach the designated position.

[0033] The first gripping end 14 and the second gripping end 24 are interconnected, and the first connecting end 11 and the second connecting end 21 are distributed at both ends. Since each vertebral nail 3 needs to be inspected by the first detection rod 1 and the second detection rod 2 before it can be determined whether it is qualified, after the first detection rod 1 is inserted and inspected, the direction is reversed so that the second detection rod 2 is inserted into the internal thread 31. This allows the worker to quickly switch between the first detection rod 1 and the second detection rod 2, thereby improving the inspection speed.

[0034] A fixing stud is formed on the first gripping end 14, and a fixing screw hole is formed on the second gripping end 24. The fixing stud is screwed into the fixing screw hole. The first detection rod 1 and the second detection rod 2 are connected together by the above-described detachable connection. When it is necessary to switch between detection rods of different sizes to detect fracture diameters of different target sizes, the first detection rod 1 or the second detection rod 2 can be unscrewed and replaced with other detection rods with detection ends of different sizes, which facilitates the detection of fracture inner diameters of different sizes.

[0035] Studs can also be formed on both the first detection rod 1 and the second detection rod 2. Both the first detection rod 1 and the second detection rod 2 are screwed onto the fixing block. The fixing block has fixing screw holes. When it is necessary to replace the detection rods of different sizes, the first detection rod 1 and the second detection rod 2 can be directly unscrewed for replacement.

[0036] The first detection rod 1 and the second detection rod 2 are made of metal. The hardness of the material of this utility model needs to be lower than that of the vertebral nail 3 to avoid scratching the vertebral nail 3. The vertebral nail 3 is protected when the first detection end 13 and the second detection end 23 are used for detection.

[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A device for measuring a vertebral body nail, characterized in that, Includes a first detection rod (1) and a second detection rod (2). The first detection rod (1) has a first connecting end (11) at one end. The first connecting end (11) is cylindrical. The diameter of the first connecting end (11) is smaller than the small diameter of the internal thread (31) of the vertebral nail (3). The first connecting end (11) has a first limiting surface (12) on both sides. The distance between the first limiting surfaces (12) is smaller than the width of the notch (32) on the vertebral nail (3). The end of the first connecting end (11) includes a first detection end (13). The first detection end (13) has the first limiting surface (12) on both sides. The first detection end (13) is cylindrical. The diameter of the first detection end (13) is smaller than the inner diameter of the target fracture of the vertebral nail (3). The second detection rod (2) has a second connecting end (21) at one end. The second connecting end (21) is cylindrical. The diameter of the second connecting end (21) is smaller than the small diameter of the internal thread (31) of the vertebral nail (3). The second connecting end (21) has a second limiting surface (22) on both sides. The distance between the second limiting surfaces (22) is smaller than the width of the notch (32) on the vertebral nail (3). The end of the second connecting end (21) includes a second detection end (23). The second detection end (23) has a second limiting surface (22) on both sides. The second detection end (23) is cylindrical. The diameter of the second detection end (23) is larger than the inner diameter of the target fracture of the vertebral nail (3).

2. The device for measuring a vertebral body peg of claim 1, wherein, The processing diameter of the first detection end (13) is 9.24 mm to 9.25 mm.

3. The device for measuring a vertebral body peg of claim 1, wherein, The processing diameter of the second detection end (23) is 9.35 mm to 9.36 mm.

4. The device for measuring a vertebral body peg of claim 1, wherein, A first gripping end (14) is formed on the first detection rod (1). The first gripping end (14) is cylindrical, and the first connecting end (11) is installed on one side of the first gripping end (14).

5. The device for measuring a vertebral body peg of claim 4, wherein, A second gripping end (24) is formed on the second detection rod (2). The second gripping end (24) is cylindrical, and the second connecting end (21) is installed on one side of the second gripping end (24).

6. The device for measuring a vertebral body peg of claim 5, wherein, The first gripping end (14) and the second gripping end (24) are interconnected, and the first connecting end (11) and the second connecting end (21) are distributed at both ends.

7. The device for measuring a vertebral body peg of claim 6, wherein, A fixing stud is formed on the first gripping end (14), and a fixing screw hole is formed on the second gripping end (24), and the fixing stud is screwed into the fixing screw hole.

8. The device for measuring a vertebral body peg of claim 1, wherein, The first detection rod (1) and the second detection rod (2) are made of metal.

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