Medical swing saw blade

Abstract

The utility model discloses a kind of medical swing saw blade, belong to medical instrument field, including saw blade body, saw blade body one end is equipped with connector, the other end is equipped with sawtooth, the connector is opened to limit hole, the limit hole includes arc portion and linear portion, round head portion connected to the both ends of arc portion. The limit hole of saw blade connector includes arc portion and linear portion, round head portion connected to the both ends of arc portion, only need to set the positioning pin on the chuck assembly of medical swing saw main machine to the corresponding shape with saw blade limit hole, i.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically a medical oscillating saw blade. Background Technology

[0002] A medical oscillating saw is a power tool commonly used in surgery, primarily for cutting bone. It can also be used for fine grinding in certain surgeries to improve the surface quality of the surgical site. A medical oscillating saw typically consists of a main unit, a handle, and a saw blade. Its working principle is that a motor drives the saw blade to oscillate at a certain frequency and angle, thereby achieving the cutting of tissues such as bone.

[0003] The saw blade is a consumable part of a medical oscillating saw. For easy replacement, the saw blade is usually mounted and fixed on the main unit via a clamping plate assembly. The clamping plate assembly includes a fixed clamping plate rigidly connected to the oscillating shaft and a movable pressure cap. A bolt is installed in the center of the movable pressure cap. The center hole of the saw blade is aligned with the axis of the clamping plate, and the blade is placed stably on the clamping plate, ensuring that the surface of the saw blade is in close contact with the clamping plate. The movable pressure cap is then tightened by the bolt. Positioning pins are usually also provided on the clamping plate, and corresponding limit holes are provided on the saw blade to ensure a secure connection and prevent the saw blade from falling off.

[0004] Currently, the locating pins commonly used in medical oscillating saws on the market typically employ either round cylindrical pins or round-headed strip pins. Round cylindrical locating pins offer advantages such as uniform force distribution, good stress dispersion, high assembly tolerance, strong adaptability, and minimal impact on saw blade strength. However, they also have disadvantages such as weaker circumferential anti-rotation capability, greater influence of fit clearance on positioning stability, and limited torsional resistance. Round-headed strip pins offer extremely strong circumferential anti-rotation capability, higher positioning stability, and excellent torsional resistance. However, they also have the disadvantage of significantly impacting saw blade strength. Therefore, round cylindrical locating pins are suitable for scenarios with moderate precision requirements and high operating frequency (such as routine osteotomy and wound debridement in orthopedics), where their advantages lie in lightweight design and minimal impact on saw blade strength. Round-headed strip pins are suitable for scenarios with extremely high precision requirements, heavy loads, and the need for long-term stable operation (such as joint replacement and spinal surgery), where their advantages lie in reliable anti-rotation, strong stability, and durable torsional resistance. This means that medical oscillating saws with different shaped locating pins often need to be replaced depending on the application scenario. If each type of oscillating saw with a locating pin requires a separate saw blade, inconsistent wear and tear can lead to insufficient or untimely blade configurations, significantly impacting treatment. Therefore, there is an urgent need for a saw blade suitable for both of these application scenarios and adaptable to various shaped locating pins. Utility Model Content

[0005] The purpose of this utility model is to provide a medical oscillating saw blade to solve the problem that the saw blade has a limited application scenario and cannot be matched with positioning pins of two shapes: round column and round-headed strip column.

[0006] This utility model provides a medical oscillating saw blade, including a saw blade body, a connector at one end of the saw blade body and saw teeth at the other end, the connector having a central hole, and a central column channel communicating with the central hole at the end of the connector away from the saw blade body, and a plurality of limiting holes distributed around the central hole, the limiting holes including an arc-shaped part and a straight part and a round head connected to the two ends of the arc-shaped part.

[0007] A further proposed solution is as follows: the limiting holes are arranged in a ring around the central hole, and the included angles formed by the lines connecting adjacent limiting holes to the center of the central hole are equal. Furthermore, the included angle formed by the lines connecting two adjacent limiting holes located at the end furthest from the saw blade body to the center of the central hole is twice the included angle of the corresponding angles of other adjacent limiting holes.

[0008] A further solution: The central column channel is located between two adjacent limiting holes at the end away from the saw blade body.

[0009] A further solution: The two adjacent limiting holes at the end furthest from the saw blade body are connected to the central column channel.

[0010] A further embodiment: the central hole is a semi-circular hole, and the central column channel is a straight channel with a width equal to the diameter of the central hole.

[0011] A further embodiment: the round head is an arc shape, the arc part is a circular arc shape, the radius of the round head and the arc part are equal, and the width of the straight part is smaller than the radius of the arc part.

[0012] A further embodiment: the end wall of the straight section near the central hole is an arc shape that curves towards the round head.

[0013] A further embodiment: the saw teeth are located on the end face of the saw blade body away from the connector.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the limiting hole of the saw blade connector includes an arc-shaped part and a straight part and a round head connected to both ends of the arc-shaped part. As long as the positioning pin on the clamping plate assembly of the medical swing saw host is set to the shape corresponding to the limiting hole of the saw blade, the saw blade can be stably connected to the host. The radial contact surface between the positioning pin and the saw blade is large, the stress dispersion is good, the positioning stability is high, and the torsional performance is good, which improves the overall performance of the saw blade and extends the service life of the saw blade. It can be applied to scenarios with medium precision requirements and high operation frequency (such as routine osteotomy and wound debridement in orthopedics), as well as scenarios with extremely high precision requirements, large load, and long-term stable operation (such as joint replacement and spinal surgery).

[0015] The curved section is designed to accommodate circular cylindrical locating pins, allowing the saw blade to be stably mounted on the chuck assembly. The two side walls of the curved section are radially symmetrically distributed, ensuring uniform stress distribution along the curved surface during operation. The coverage area of ​​the curved section is determined by the radius of the arc and the width of the opening, accommodating circular cylindrical locating pins with a certain diameter range. Errors in the machining of the circular cylindrical locating pins are permissible; even after long-term use of the medical oscillating saw, if the circular cylindrical locating pins slightly shrink due to wear, it will not affect the stable assembly of the saw blade and chuck assembly.

[0016] The limiting hole can still be assembled with the round-headed strip-shaped locating pin. The straight part of the limiting hole bears the positioning accuracy and the main load, while the arc-shaped part and the round head mainly play the role of guidance, fault tolerance or buffering, allowing for minor deviations during assembly.

[0017] The saw blade can adapt to positioning pins that correspond to the shape of the limiting hole, as well as round column positioning pins and round-headed strip column positioning pins. One saw blade can adapt to three shapes of positioning pins, making it widely applicable. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0020] Figure 2 This is a front view of a preferred embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the connector structure of a preferred embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram (I) of the assembly of the preferred embodiment of the present invention and the clamping plate.

[0023] Figure 5 for Figure 4 A front view of a partial structure.

[0024] Figure 6 This is a schematic diagram (II) of the assembly of the preferred embodiment of the present invention and the clamping plate.

[0025] Figure 7 for Figure 6 A front view of a partial structure.

[0026] Figure 8 This is a schematic diagram (III) of the assembly of the preferred embodiment of the present invention and the clamping plate.

[0027] Figure 9 for Figure 8 A front view of a partial structure.

[0028] In the diagram: 1-Connector; 11-Center hole; 12-Center column channel; 13-Limiting hole; 131-Straight section; 132-Arc section; 133-Round head; 2-Saw blade body; 3-Saw teeth; 4-Chuck; 41-Shaft; 42-Positioning pin; 5-Swing shaft. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Please see Figures 1-9 As shown, this embodiment provides a medical oscillating saw blade, including a saw blade body 2. One end of the saw blade body 2 is provided with a connector 1, and the other end is provided with saw teeth 3. The saw teeth 3 are provided on the end face of the saw blade body 2 away from the connector 1. The connector 1 is provided with a central hole 11. The end of the connector 1 away from the saw blade body 2 is provided with a central column channel 12 communicating with the central hole 11. A plurality of limiting holes 13 are distributed around the central hole 11. The limiting holes 13 include an arc-shaped part 132 and a straight part 131 and a round head 133 connected to the two ends of the arc-shaped part 132.

[0035] Before installing the saw blade onto the chuck 4, loosen the fastening bolts to move the movable pressure plate (not shown in the figure, parallel to the chuck, with the saw blade installed between the chuck and the movable pressure plate) upwards, separating it from the chuck 4 by a certain distance. Place the saw blade near the movable pressure plate, align the central column channel 12 with the axis 41, and push the saw blade in so that the axis 41 is located in the central hole 11, and one of the positioning pins 42 is located in the central column channel 12. At this time, the other positioning pins 42 correspond one-to-one with the limiting holes 13. Lower the saw blade to assemble the positioning pins 42 with the limiting holes 13. Tighten the fastening bolts to press the movable pressure plate onto the positioning pins 42 to prevent the saw blade from coming off. The chuck 4 is connected to the swing shaft of the main unit's drive mechanism. The main unit can drive the chuck 4 to swing with the saw blade at a certain frequency and angle, thereby achieving the cutting of bones and other tissues.

[0036] Please see Figure 4 , Figure 5As shown, the limiting hole 13 of the connector 1 includes an arc-shaped part 132 and a straight part 131 and a round head 133 connected to both ends of the arc-shaped part 132. By simply setting the positioning pin 42 on the chuck 4 of the medical swing saw host to the shape corresponding to the limiting hole 13, the saw blade can be stably connected to the host. The positioning pin 42 has a large radial contact surface with the saw blade, good stress dispersion, high positioning stability, and good torsional performance, which improves the overall performance of the saw blade and extends its service life. It can be applied to scenarios with medium precision requirements and high operation frequency (such as routine osteotomy and wound debridement in orthopedics) as well as scenarios with extremely high precision requirements, large load, and long-term stable operation (such as joint replacement and spinal surgery).

[0037] Please see Figure 6 , Figure 7 As shown, the arc-shaped portion 132 is used to fit the locating pin 42 of the circular column, which can stably install the saw blade onto the chuck assembly. The two side walls of the arc-shaped portion 132 are symmetrically distributed radially, and the stress is evenly distributed along the arc surface during operation. The containment range of the arc-shaped portion 132 is determined by the radius of the arc and the width of the opening, which can fit the locating pin 42 of the circular column with a certain diameter range. It allows for machining errors in the locating pin 42 of the circular column. After long-term use of the medical oscillating saw, if the locating pin 42 of the circular column becomes slightly smaller due to wear, it will not affect the stable assembly of the saw blade and the chuck assembly.

[0038] Please see Figure 8 , Figure 9 As shown, the limiting hole 13 can still be assembled with the positioning pin 42 of the round-headed strip column. The straight part 131 of the limiting hole 13 bears the positioning accuracy and main load, while the arc-shaped part 132 and the round head 133 mainly play the role of guidance, fault tolerance or buffering, allowing for minor deviations during assembly.

[0039] The saw blade can simultaneously adapt to the positioning pin 42 corresponding to the shape of the limiting hole 13, as well as the positioning pin 42 of a round column and the positioning pin 42 of a round-headed strip column. The host machine with one saw blade adaptable to three shapes of positioning pins 42 has a wide range of applications and enhances its versatility.

[0040] It should be noted that the size and position of the limiting hole 13 are usually designed according to the diameter of the connector 1. The diameter of the chuck 4 is usually comparable to that of the connector 1. The positioning pin 42 of the chuck 4 is usually set according to the limiting hole 13 of the saw blade. There is also a positioning pin 42 corresponding to the center column channel 12. For connectors 1 of the same diameter, the optimal design position, size, and number of limiting holes 13 are fixed. The diameter of the positioning pin 42 of the circular column is generally larger than the width of the positioning pin 42 of the round-headed strip column. For connectors 1 with the same diameter, the positioning pin 42 of the circular column is generally set at the position of the arc-shaped part 132, and the diameter of the positioning pin 42 matches the diameter of the arc-shaped part 132. The position of the positioning pin 42 of the round-headed strip column corresponds to the limiting hole 13, and the width of the positioning pin 42 of the round-headed strip column matches the straight part 131. The change in the diameter of connector 1 will cause the position of the limiting hole 13 to change radially along connector 1, and will also cause changes in the length and width of the straight part 131 and the diameter positions of the arc part 132 and the round head 133. A saw blade that can simultaneously adapt to three different shapes of positioning pins 42 is based on the design that the diameter of the connector 1 of the saw blades corresponding to the three main units is consistent, which can also be understood as the diameter of the chuck 4 being consistent. The saw blade limiting hole 13 provided in this application can adapt to the three aforementioned shapes of positioning pins when the connector 1 of the same diameter is optimally designed, thus enhancing the adaptability of the saw blade to the main unit. For users who have already configured a main unit with round column positioning pins and a main unit with round head strip column positioning pins, and whose positioning pins of both main units are optimally designed to match the same diameter connector 1, the saw blade provided in this application can be configured, reducing the impact of insufficient or untimely configuration of a certain saw blade due to inconsistent wear of different saw blades, and avoiding affecting treatment.

[0041] In some embodiments, please refer to Figures 1-9 As shown, the limiting holes 13 are arranged in a ring around the central hole 11. The angles formed by the lines connecting adjacent limiting holes 13 to the center of the central hole 11 are equal. The angle formed by the lines connecting two adjacent limiting holes 13 at the end away from the saw blade body 2 to the center of the central hole 11 is twice the angle of the corresponding angle of other adjacent limiting holes 13. The central column channel 12 is located between two adjacent limiting holes 13 at the end away from the saw blade body 2. The central column channel 12 serves as a channel for the shaft 41 to enter the central hole 11 from the outside of the saw blade during installation. It can also cooperate with one of the locating pins 42 for positioning during saw blade installation.

[0042] In some embodiments, please refer to Figures 1-9As shown, the two adjacent limiting holes 13 at the end furthest from the saw blade body 2 are connected to the central column channel 12, which facilitates saw blade processing and assembly of the saw blade and chuck. The portion where the limiting holes 13 connect to the central column channel 12 is chamfered to avoid stress concentration. The central hole 11 is a semi-circular hole, and the central column channel 12 is a straight channel with a width equal to the diameter of the central hole 11, which facilitates the smooth passage of the shaft 41 through the central column channel 12 and its assembly into the central hole 11.

[0043] In some embodiments, please refer to Figures 1-3 As shown, the round head 133 is bow-shaped, the arc-shaped part 132 is arc-shaped, the radii of the round head 133 and the arc-shaped part 132 are equal, and the width of the straight part 131 is smaller than the radius of the arc-shaped part 132. The positioning holes 13 have smooth transitions without abrupt changes, a large radial contact surface, good stress dispersion, high positioning stability, and good torsional resistance, thus improving the overall performance of the saw blade and extending its service life. The end wall of the straight part 131 near the center hole 11 is arc-shaped, curving towards the round head 133, changing the direction of force on the end wall and enhancing the fatigue strength of the connection between the end wall of the straight part 131 and the center hole 11.

[0044] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A medical oscillating saw blade, comprising a saw blade body, a connector at one end of the saw blade body, and saw teeth at the other end, characterized in that... The connector has a central hole, and the end of the connector away from the saw blade body has a central column channel communicating with the central hole. Several limiting holes are distributed around the central hole. The limiting holes include an arc-shaped part and a straight part and a round head connected to the two ends of the arc-shaped part.

2. The medical oscillating saw blade according to claim 1, characterized in that, Each limiting hole is arranged in a ring around the central hole. The angles formed by the lines connecting adjacent limiting holes to the center of the central hole are equal. Furthermore, the angle formed by the lines connecting two adjacent limiting holes located at the end furthest from the saw blade body to the center of the central hole is twice the corresponding angles of other adjacent limiting holes.

3. A medical oscillating saw blade according to claim 2, characterized in that, The central column channel is located between two adjacent limiting holes at the end furthest from the saw blade body.

4. A medical oscillating saw blade according to claim 3, characterized in that, The two adjacent limiting holes at the end furthest from the saw blade body are connected to the central column channel.

5. A medical oscillating saw blade according to claim 1, characterized in that, The central hole is a semi-circular hole, and the central column channel is a straight channel with a width equal to the diameter of the central hole.

6. A medical oscillating saw blade according to claim 1, characterized in that, The round head is bow-shaped, the arc-shaped part is arc-shaped, the radius of the round head and the arc-shaped part are equal, and the width of the straight part is smaller than the radius of the arc-shaped part.

7. A medical oscillating saw blade according to claim 6, characterized in that, The end wall of the straight section near the central hole is curved towards the round head.

8. A medical oscillating saw blade according to any one of claims 1-7, characterized in that, The saw teeth are located on the end face of the saw blade body away from the connector.

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