Flexible shaft device for tissue resection

Abstract

The present application discloses a flexible shaft device for tissue resection, which generally relates to the field of medical device technology. The device comprises: a flexible shaft body and a grinding head, wherein the grinding head is mounted at the front end of the flexible shaft body; the flexible shaft body comprises a rigid shaft and a flexible shaft; one end of the flexible shaft is fixedly connected to the grinding head; the other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the power motor drives the flexible shaft body to drive the grinding head to rotate.

Description

Technical Field

[0001] The present disclosure generally relates to the field of medical device technology, and more particularly to a flexible shaft device for tissue resection. Background Art

[0002] In the process of bone tissue or other soft tissue resection, a sharpener including a grinding head is generally used to resect the diseased tissue through high-speed grinding.

[0003] Since the traditional grinding head and the operating handle are fixed in the same direction, it is not convenient to observe the surgical position of the patient, and since the direction change method is not flexible enough, it is difficult to process bone tissue or other soft tissue with complex angles. In the related art, by installing the grinding head at the front end of the shaft body composed of a rigid shaft and a universal joint, the grinding head can be bent to a certain extent, but it still cannot meet the requirements of flexible bending of the grinding head at more angles. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the related art, it is desired to provide a flexible shaft device for tissue resection, which can solve the problem that the current grinding head cannot be flexibly bent at more angles, thereby greatly improving the bending flexibility of the grinding head.

[0005] In a first aspect, a flexible shaft device for tissue resection is provided, the device comprising: a flexible shaft body and a grinding head, the grinding head being mounted on a front end of the flexible shaft body;

[0006] The flexible shaft body comprises a rigid shaft and a flexible shaft;

[0007] One end of the flexible shaft is fixedly connected to the grinding head;

[0008] The other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the power motor drives the flexible shaft to drive the grinding head to rotate.

[0009] In the present application, the grinding head is installed at the front end of a flexible shaft body including a rigid shaft and a flexible shaft. Specifically, one end of the flexible shaft is fixedly connected to the grinding head, and the flexible shaft is used to drive the grinding head to rotate; the other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the power motor drives the above-mentioned flexible shaft body to drive the grinding head to rotate. By installing the grinding head at the front end of a flexible shaft body that can change the angle at will, the angle change range of the grinding head is greatly increased compared to before. At the same time, by setting a flexible shaft body including a rigid shaft and a flexible shaft, the grinding head can change the angle while ensuring the stability of the grinding head during use, which greatly improves the flexibility of the use of the grinding head.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0012] Figure 1 One of the structural schematic diagrams of the flexible shaft device for tissue resection provided in an embodiment of the present application;

[0013] Figure 2 The second structural schematic diagram of the flexible shaft device for tissue resection provided in an embodiment of the present application;

[0014] Figure 3 The third structural schematic diagram of the flexible shaft device for tissue resection provided in an embodiment of the present application;

[0015] Figure 4 The fourth structural schematic diagram of the flexible shaft device for tissue resection provided in an embodiment of the present application;

[0016] Figure 5 A fifth structural schematic diagram of a flexible shaft device for tissue resection provided in an embodiment of the present application;

[0017] Figure 6 The sixth structural schematic diagram of the flexible shaft device for tissue resection provided in an embodiment of the present application;

[0018] Figure 7 This is the seventh structural schematic diagram of the flexible shaft device for tissue resection provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0021] The following is an introduction to the usage scenarios of this application.

[0022] During the process of bone tissue or other soft tissue removal, a sharpener is generally used to remove the diseased tissue or open the internal channel through high-speed planing or grinding.

[0023] Since the conventional grinding head and the operating handle are fixed in the same direction, it is not convenient to observe the surgical position of the patient for this kind of cutting, and since the way of changing the direction is not flexible enough, that is, the grinding head can only be used in the direction of the operating handle, it is difficult to process bone tissue or other soft tissues with complex angles, such as compressive bone / bone spurs with large angles and deep lesions. In the related art, by installing the grinding head at the front end of the shaft body of the rigid shaft and the universal joint combination, the bending of the grinding head can be achieved to a certain extent, but it still cannot meet the flexible bending of the grinding head at more angles.

[0024] In order to overcome the above-mentioned inflexible grinding head, in the related technology, the surgical method is changed to open surgery to treat difficult lesions, or a grinding head with a universal joint structure is set up and the incision of minimally invasive surgery is enlarged to a certain extent to treat bone tissue or other soft tissues that cannot be treated by right-angle grinding heads.

[0025] Specifically, for the above-mentioned grinding head with a universal joint structure, its universal joint structure can be a combination of a rigid shaft and a universal joint to achieve bending at a certain angle, so that the power changes a certain angle and processes bones in some special positions. However, the combination of the universal joint and the rigid shaft cannot achieve continuous operation at a high speed (more than 60,000 revolutions per minute), and the maximum bending angle of the universal joint structure is 30°, which cannot achieve large angle bending, and the maximum speed at the bending angle can only be 10,000 revolutions per minute, which is far from meeting the needs of use during clinical surgery.

[0026] Based on this, the present application proposes a flexible shaft device for tissue resection, which can solve the problem that the current grinding head cannot be flexibly bent at more angles, and greatly improves the bending flexibility of the grinding head.

[0027] Figure 1 It is a schematic structural diagram of a flexible shaft device for tissue resection provided in an embodiment of the present application, wherein the device comprises: a flexible shaft body and a grinding head.

[0028] For example, in Figure 1 In the figure, the flexible shaft is 10 and the grinding head is 20.

[0029] Exemplarily, the above-mentioned grinding head is a grinding head for removing tissue, such as bone tissue or other soft tissue.

[0030] Exemplarily, the grinding head may be a metal grinding head or a non-metal grinding head, which is not limited in the embodiments of the present application.

[0031] Exemplarily, the grinding head is an end-effector tool with a cutting edge.

[0032] Exemplarily, the flexible shaft body is a shaft body with flexibility and a large angular bending range. For example, the bending angle range of the flexible shaft body can be 0-90°.

[0033] In an embodiment of the present application, the grinding head is installed at the front end of the flexible shaft.

[0034] Exemplarily, the flexible shaft includes two ends, one end is connected to the power motor, and the other end is connected to the grinding head.

[0035] Furthermore, the front end of the flexible shaft is the end that is not connected to the power motor.

[0036] Exemplarily, the front end may be an output end of the flexible shaft.

[0037] Furthermore, the output end of the flexible shaft is connected to the grinding head, and the input end is connected to the power motor.

[0038] In the embodiment of the present application, the flexible shaft body includes a rigid shaft and a flexible shaft.

[0039] Exemplarily, the rigid shaft may be a metal shaft or a non-metal shaft.

[0040] Exemplarily, the shaft body of the rigid shaft may be a hollow shaft body or a solid shaft body.

[0041] Optionally, in an embodiment of the present application, when the above-mentioned device further includes an outer tube, there is a gap between the above-mentioned outer tube and the above-mentioned flexible shaft body.

[0042] Exemplarily, the gap is used for circulating cooling liquid.

[0043] Optionally, when the shaft body of the rigid shaft is a hollow shaft body, the rigid shaft includes a cavity member, and the cavity member is used for circulating cooling liquid.

[0044] Exemplarily, the cavity and the thin-walled stainless steel tube are provided with through holes for the coolant to enter and flow out, and the flexible sub-shaft connected to the cavity and the thin-walled stainless steel tube is a flexible shaft that does not include a core rod.

[0045] It is understandable that when the above-mentioned flexible shaft is driven by a power motor and runs at high speed (for example, more than 60,000 revolutions per minute), heat will be generated. Therefore, by setting up a cavity part and then connecting the coolant from the outside, the coolant passes through the outside of the rigid shaft and the cavity part of the rigid shaft, and then flows through the entire body of the flexible shaft, thereby achieving the purpose of cooling.

[0046] In one example, the coolant can flow through the exterior and the cavity of the rigid shaft under the external force of a liquid peristaltic pump, and then flow through the entire body of the flexible shaft.

[0047] Exemplarily, the flexible shaft is a shaft that is flexible and has a large angular bending range. For example, the bending angle range of the flexible shaft may be 0-90°.

[0048] Furthermore, the above-mentioned flexible shaft can fix the bending angle at any angle between 0-90 degrees by cooperating with the rigid shaft.

[0049] Exemplarily, one end of the flexible shaft is fixedly connected to the grinding head.

[0050] Exemplarily, the other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the flexible shaft is driven by the power motor to drive the grinding head to rotate.

[0051] It is understandable that the grinding head may be directly fixedly connected to one end of the flexible shaft, or may not be directly fixedly connected to one end of the flexible shaft.

[0052] Optionally, in an embodiment of the present application, when the grinding head is not directly fixedly connected to one end of the flexible shaft, one end of the flexible shaft and the grinding head are fixedly connected via a fixed connection member.

[0053] Exemplarily, the connection method in which one end of the flexible shaft and the grinding head are fixedly connected via a fixed connection piece may include crimping, gluing or welding.

[0054] Exemplarily, the above-mentioned fixed connection member may include a metal component or a non-metal component.

[0055] In one example, when the fixed connection member is a metal component, the fixed connection member may be a hollow metal tube.

[0056] Furthermore, the metal material may be stainless steel, and the hollow metal tube may be a hollow thin-walled stainless steel tube.

[0057] Exemplarily, the other end of the flexible shaft and one end of the rigid shaft may be fixedly connected in a manner including crimping, gluing or welding.

[0058] It can be understood that the inner diameter of the thin-walled stainless steel tube matches the diameter of the flexible shaft, and the flexible shaft can be inserted into the thin-walled stainless steel tube, thereby being fixedly connected using the above-mentioned fixing method.

[0059] It should be noted that the above-mentioned flexible shaft can be bent at will, and in practical applications, usually only the part of the flexible shaft near one end of the grinding head is bent, for example, only the part of the flexible shaft with a length of 2-10 cm near one end of the grinding head is bent.

[0060] Example 1, such as Figure 1 As shown, the flexible shaft body 10 includes a rigid shaft 11 and a flexible shaft 12. One end of the flexible shaft 12, that is, the output end of the flexible shaft body, is fixedly connected through a thin-walled stainless steel tube 13 whose diameter matches that of the flexible shaft body, and then fixedly connected to the grinding head 20. The other end of the flexible shaft 12 is fixedly connected to one end of the rigid shaft 11. The flexible shaft 12 can be bent and fixed at any angle between 0-90°. The other end of the rigid shaft 11, that is, the input end of the flexible shaft body 10, is electrically connected to a power motor to drive the entire flexible shaft body to drive the grinding head 20 to rotate at a speed of 0 to 80,000 revolutions per minute.

[0061] In the method provided in the embodiment of the present application, the grinding head is installed at the front end of a flexible shaft body including a rigid shaft and a flexible shaft. Specifically, one end of the flexible shaft is fixedly connected to the grinding head, and the flexible shaft is used to drive the grinding head to rotate; the other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the power motor drives the above-mentioned flexible shaft body to drive the grinding head to rotate. By installing the grinding head at the front end of a flexible shaft body that can change the angle at will, the angle change range of the grinding head is greatly increased compared to before. At the same time, by setting a flexible shaft body including a rigid shaft and a flexible shaft, the grinding head can change the angle while ensuring the stability of the grinding head during use, which greatly improves the flexibility of the use of the grinding head.

[0062] In another embodiment of the present application, the structure of the flexible shaft body is provided in the case where the flexible shaft body includes a plurality of rigid sub-axes and a plurality of flexible sub-axes. Optionally, the flexible shaft body includes a plurality of rigid sub-axes and a plurality of flexible sub-axes, and the number of the rigid sub-axes and the number of the flexible sub-axes are the same.

[0063] Exemplarily, the plurality of rigid sub-axes and the plurality of flexible sub-axes are arranged at intervals and fixedly connected.

[0064] Exemplarily, one end of a first flexible sub-shaft among the plurality of flexible sub-shafts is connected to the grinding head, and the other end of the first flexible sub-shaft is fixedly connected to the second rigid sub-shaft.

[0065] Exemplarily, one end of the last rigid shaft among the multiple rigid sub-shafts is fixedly connected to the last flexible sub-shaft, and the other end of the last rigid shaft is connected to the power motor.

[0066] It can be understood that, when the flexible shaft body includes a plurality of rigid sub-axes and a plurality of flexible sub-axes, the rigid sub-axes and the flexible sub-axes are arranged at intervals and fixedly connected. The description of the rigid sub-axes can refer to the description of the rigid shaft, and the description of the flexible sub-axes can refer to the description of the flexible shaft, which will not be repeated here.

[0067] Furthermore, by arranging multiple rigid sub-axes and multiple flexible sub-axes at intervals to form a flexible shaft body, the applicable scenarios for tissue resection using the flexible shaft device can be made more flexible and convenient in actual applications. When the incision is small enough, tissue resection can also be completed through the flexible shaft device.

[0068] In one example, different bending angles can be set for different flexible sub-axes, so that the angle of the entire flexible shaft body is variable, and the flexibility of the structural setting of the entire flexible shaft device is greatly increased.

[0069] Example 2: Figure 2 As shown, the flexible shaft body includes two rigid sub-shafts, namely, rigid sub-shaft 31 and rigid sub-shaft 33, and two flexible sub-shafts, namely, flexible sub-shaft 32 and flexible sub-shaft 34, wherein one end of the flexible sub-shaft 32 is fixedly connected to the grinding head 12 through a thin-walled stainless steel tube 13, and then the other end of the flexible sub-shaft 32 is fixedly connected to one end of the rigid sub-shaft 31, and then the other end of the rigid sub-shaft 31 is fixedly connected to one end of the flexible sub-shaft 34, and then the other end of the flexible sub-shaft 34 is connected to one end of the rigid sub-shaft 33, and finally, the other end of the rigid sub-shaft 33 is electrically connected to the power motor to drive the entire flexible shaft body to drive the grinding head to rotate at a speed of 0 to 80,000 revolutions per minute. In practical applications, the bending angle of the flexible sub-shaft 32 is set between 20°-30°, and can usually be set at 24°, and the bending angle of the flexible sub-shaft 34 is set between the bending angle range of 0-90° according to the needs of the operator. The reason why the bending angle of the flexible sub-shaft 32 is set between 20° and 30° is to reduce the obstruction of the operator's sight by the flexible sub-shaft.

[0070] Optionally, in an embodiment of the present application, when the flexible shaft body includes more than two rigid sub-shafts and more than two flexible sub-shafts, the device includes a speed reduction mechanism, and the speed reduction mechanism is used to reduce the rotation speed of the power motor.

[0071] It can be understood that when the above-mentioned flexible shaft body includes multiple rigid sub-axes and multiple flexible sub-axes, if the rotation speed is too high, for example, greater than 60,000 revolutions per minute, there may be a situation where the torque of the grinding head for cutting tissue is too small. Therefore, a corresponding deceleration mechanism can be set according to the torque value output by the grinding head to increase the torque input of the grinding head by reducing the speed output of the power motor.

[0072] Optionally, in an embodiment of the present application, the above-mentioned flexible shaft includes two types, one is a flexible shaft that does not include an axis rod, and the other is a flexible shaft that includes an axis rod.

[0073] Illustratively, in an embodiment of the present application, when the flexible shaft is a flexible shaft that does not include a core rod, the flexible shaft includes multiple layers of linear windings.

[0074] Example 3: Figure 3 As shown, Figure 3 3D is a stereogram of the flexible shaft. It can be seen from the stereogram that the flexible shaft includes three layers of linear windings.

[0075] Exemplarily, each of the above-mentioned linear winding layers is formed by winding a linear material, and the above-mentioned multiple linear winding layers are wound layer by layer.

[0076] In one example, the winding method of the linear winding layer can be a spiral winding method, such as Figures 3 to 7 , both show that the winding mode of the linear winding is a spiral winding mode.

[0077] Exemplarily, the linear material may be a metal material or a non-metal material.

[0078] In one example, when the linear material is a non-metallic material, the linear material may be a braided wire.

[0079] In another example, when the linear material is a metal material, the linear material may be stainless steel. For example, 304V stainless steel wire

[0080] Furthermore, the linear materials used in the above-mentioned different winding layers have different rigidities. Generally, the linear winding layers closer to the inside have higher rigidity, while the linear winding layers closer to the outside have lower rigidity, thus ensuring the support and flexibility of the flexible shaft.

[0081] It is understandable that the braided wires are wound around themselves to form the innermost layer of the flexible shaft, or a single vertical braided wire forms the innermost layer of the flexible shaft. In the case of forming the innermost layer, the braided wire is wound around the innermost layer of the flexible shaft to form a second winding layer, and then the braided wire is wound around the second winding layer to form a third winding layer.

[0082] Furthermore, different linear winding layers have different distances from the winding layer center point, that is, different linear winding layers have different diameters.

[0083] Exemplarily, the number of wire strands in each linear winding layer may be the same or different.

[0084] Exemplarily, the diameter of the linear winding material of the multiple layers of linear winding of the flexible shaft increases layer by layer from the inside to the outside.

[0085] Exemplarily, during the winding process of different linear winding layers, the spacings of the linear winding materials may be the same or different.

[0086] In one example, the outermost linear winding layer is, the larger the spacing between the linear winding materials during the winding process can be, so that the tightness between each linear winding layer during the winding process can be ensured to meet the requirements.

[0087] It can be understood that, when the flexible shaft only includes multiple layers of linear windings, the flexible shaft does not have an axis, that is, the flexible shaft is constructed by only using linear windings.

[0088] Example 4: Combined with the above example 3, Figure 3 The outer diameters of the innermost linear winding layer, i.e., the first winding layer, the second linear winding layer, i.e., the second winding layer, and the outermost linear winding layer, i.e., the third winding layer, are 0.45 mm, 0.72 mm, and 1.03 mm, respectively. The number of wire strands in the first winding layer is 5, the number of wire strands in the second winding layer is 5, and the number of wire strands in the third winding layer is also 5.

[0089] Furthermore, the wire diameter of the first winding layer is 0.1 mm, the wire diameter of the second winding layer is 0.13 mm, and the wire diameter of the third winding layer is 0.15 mm respectively. The spiral pitches of the first winding layer, the second winding layer, and the third winding layer are 0.6 mm, 0.76 mm, and 0.84 mm respectively.

[0090] In this way, by not setting up an axial rod and instead using a linear winding material to wrap around itself to form a flexible shaft, the spiral state of the flexible shaft during high-speed movement can be reduced, thereby improving the efficiency of use of the flexible shaft and the accuracy of tissue removal.

[0091] Optionally, when the shaft body of the rigid shaft is a hollow shaft body, the rigid shaft includes a cavity, and through holes for the coolant to enter and flow out are provided in the cavity and the thin-walled stainless steel tube, and the cavity is used for circulating the coolant.

[0092] Exemplarily, the above-mentioned cavity is arranged at the center position of the last flexible sub-shaft, and the cavity corresponds to the position of the hollow axis of the shaft rod. The coolant can flow from the cavity through the hollow axis, thereby cooling the entire flexible shaft body.

[0093] It is understandable that when the above-mentioned flexible shaft is driven by a power motor and runs at high speed (for example, more than 60,000 revolutions per minute), heat will be generated. Therefore, by setting up a cavity part and then connecting the coolant from the outside, the coolant passes through the outside of the rigid shaft and the cavity part of the rigid shaft, and then flows through the entire body of the flexible shaft, thereby achieving the purpose of cooling.

[0094] In one example, the coolant can flow through the exterior and the cavity of the rigid shaft under the external force of a liquid peristaltic pump, and then flow through the entire body of the flexible shaft.

[0095] Exemplarily, in the case where the flexible shaft is a flexible shaft including an axis rod, in an embodiment of the present application, the flexible shaft includes an axis rod and multiple layers of linear windings; each layer of the linear windings is composed of a linear material wound along the axis rod.

[0096] Exemplarily, the flexible shaft is centered on the shaft core rod, and the linear windings are stacked and wound around the flexible shaft to form the multi-layer linear windings.

[0097] Exemplarily, the above-mentioned shaft rod is a soft shaft.

[0098] Exemplarily, the above-mentioned axial rod can be made of metal material or non-metal material, which is not limited in the embodiments of the present application.

[0099] In one example, when the above-mentioned shaft rod can be made of metal material, the above-mentioned shaft rod can be a flexible steel wire or a stainless steel hose.

[0100] In one example, when the above-mentioned shaft core rod is made of non-metallic material, the above-mentioned shaft core rod can be elastic plastic or a hollow elastic plastic tube.

[0101] Exemplarily, each of the above-mentioned linear winding layers can be formed by winding linear winding materials with different numbers of strands or the same number of strands.

[0102] In one example, the above-mentioned winding method includes: horizontal spiral winding.

[0103] In one example, the number of strands of the linear winding material may be 3-16 strands, which is not limited in the embodiment of the present application.

[0104] It can be understood that, through the above-mentioned horizontal spiral winding and the winding method of multiple linear windings, the linear windings can be squeezed against each other to keep the winding layers stable.

[0105] Exemplarily, each of the above-mentioned linear winding layers is formed by winding a linear material, and the above-mentioned multiple linear winding layers are wound layer by layer.

[0106] like Figure 4 , Figure 5 and Figure 6 As shown, Figure 4 , Figure 5 and Figure 6 It is used to show the structure of multi-layer linear winding with a shaft rod. It can be seen that Figure 4 and Figure 5 It includes 3 layers of linear winding. Figure 6 There are 5 layers of linear windings, among which Figure 6 In the figure, the core rod (also known as the shaft core rod) is displayed, and different winding layers are wound around the core rod to form a flexible shaft.

[0107] The following lists the diameter of the flexible shaft, as well as the bending angle, rotation speed, bending radius, length, and transmission torque:

[0108] 1. The diameter of the flexible shaft is 0.4-3 mm, the bending angle is: 0-105 degrees, the rotation speed is: 15000-80000 rpm, the bending radius is: 1.5-9 mm, and the length is: 5-300 mm, and the transmission torque is greater than 4.5 NM.

[0109] 2. The diameter of the flexible shaft is 1 mm, the bending angle is 0-105 degrees, the rotation speed is 15000-80000 rpm, the bending radius is 1.5-9 mm, and the length is 150 mm, and the transmission torque is greater than 4.5 NM;

[0110] 3. The diameter of the flexible shaft is 0.4 mm, the bending angle is: 0-105 degrees, the rotation speed is: 15000-80000 rpm, the bending radius is: 1.5-2 mm, and the length is 5 mm, and the transmission torque is greater than 4.5 NM.

[0111] 4. The diameter of the flexible shaft is 3mm, the bending angle is: 0-105 degrees, the rotation speed is: 15000-80000rpm, the bending radius is: 3-9mm, and the length is 300mm, and the transmission torque is greater than 4.5NM.

[0112] Optionally, the winding directions of the wires between adjacent winding layers in the multi-layer linear winding are different.

[0113] In one example, adjacent linear winding layers are wound in opposite directions.

[0114] like Figure 6 As shown, the spiral directions of the linear windings of the first layer of linear windings and the second layer of linear windings are opposite, the spiral directions of the linear windings of the second layer of linear windings and the third layer of linear windings are opposite, the spiral directions of the linear windings of the third layer of linear windings and the fourth layer of linear windings are opposite, and the spiral directions of the linear windings of the fourth layer of linear windings and the fifth layer of linear windings are opposite.

[0115] In this way, different linear winding layers can be squeezed and stressed against each other during actual use, thereby ensuring the structural stability of each winding layer.

[0116] Optionally, in an embodiment of the present application, a gap is set between each linear winding in the above-mentioned multi-layer linear winding.

[0117] It can be understood that the above-mentioned gap is the space available between each winding layer.

[0118] Furthermore, the distance of the above gap is a preset distance that will not affect the stability of the flexible shaft.

[0119] In this way, by setting a gap between each winding layer, it is possible to ensure that there is space between different winding layers, thereby ensuring the softness and elasticity of the flexible shaft, thereby reducing vibration and noise, while avoiding excessive gaps to ensure the rigidity and stability of the flexible shaft.

[0120] Optionally, in the embodiment of the present application, an outer covering layer is provided on the outer side of the outermost linear winding layer among the above-mentioned multi-layer linear winding layers.

[0121] Exemplarily, the outer covering layer may be a single-shot molding material or a non-single-shot molding material.

[0122] In one example, when the outer coating layer is a single-shot molding material, the outer coating layer may be a heat shrink tube with a lubricating liquid.

[0123] In another example, in the case where the outer covering layer may be a non-single-molding material, the outer covering layer may be braided with high-temperature resistant elastic plastic wires.

[0124] In this way, by providing the outer covering layer, the surface of the flexible shaft can be protected from being easily damaged by bumps and the like.

[0125] For the several modules or units mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0126] It should be noted that for details not disclosed in the flexible shaft device for tissue resection in the embodiment of the present application, please refer to the details disclosed in the above embodiments of the present application, which will not be repeated here.

[0127] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A flexible shaft device for tissue resection, characterized in that: The device comprises: a flexible shaft and a grinding head, wherein the grinding head is mounted at the front end of the flexible shaft; The flexible shaft body comprises a rigid shaft and a flexible shaft; One end of the flexible shaft is fixedly connected to the grinding head; The other end of the flexible shaft is fixedly connected to one end of the rigid shaft, and the other end of the rigid shaft is connected to a power motor, and the power motor drives the flexible shaft to drive the grinding head to rotate.

2. The device according to claim 1, characterized in that The flexible shaft body comprises a plurality of rigid sub-shafts and a plurality of flexible sub-shafts, and the number of the rigid sub-shafts and the number of the flexible sub-shafts are the same; The plurality of rigid sub-axes and the plurality of flexible sub-axes are arranged at intervals and fixedly connected; One end of a first flexible sub-shaft among the plurality of flexible sub-shafts is connected to the grinding head, and the other end of the first flexible sub-shaft is fixedly connected to the second rigid sub-shaft; One end of the last rigid shaft among the multiple rigid sub-shafts is fixedly connected to the last flexible sub-shaft, and the other end of the last rigid shaft is connected to the power motor.

3. The device according to claim 2, characterized in that In the case where the flexible shaft body includes more than two rigid sub-shafts and more than two flexible sub-shafts, the device includes a speed reduction mechanism, and the speed reduction mechanism is used to reduce the rotation speed of the power motor.

4. The device according to claim 1, characterized in that One end of the flexible shaft and the grinding head are fixedly connected via a fixed connecting piece.

5. The device according to claim 1, characterized in that When the device includes an outer tube, there is a gap between the outer tube and the flexible shaft; the gap is used for circulating cooling liquid.

6. The device according to claim 1, characterized in that The flexible shaft comprises multiple layers of linear windings; each layer of the linear windings is formed by winding a linear material, and the multiple layers of linear windings are wound layer by layer.

7. The device according to claim 6, characterized in that The diameter of the linear material of the multiple layers of linear windings of the flexible shaft increases layer by layer from the inside to the outside.

8. The device according to claim 6, characterized in that In the case that the shaft body of the rigid shaft is a hollow shaft body, the rigid shaft comprises a cavity part, and through holes for the coolant to enter and flow out are provided in the cavity part and the thin-walled stainless steel tube, and the above-mentioned cavity part is used for circulating the coolant.

9. The device according to claim 1, characterized in that The flexible shaft comprises a core rod and multiple layers of linear windings; each layer of the linear windings is formed by winding a linear material along the core rod; the flexible shaft takes the core rod as the center, and the linear windings are wound in layers to form the multiple layers of linear windings.

10. The device according to any one of claims 7 to 9, characterized in that: The winding directions of the wires between adjacent winding layers in the multi-layer linear winding are different.

11. The device according to any one of claims 7 to 9, characterized in that: A gap is arranged between each of the linear winding layers in the multi-layer linear winding layers.

12. The device according to any one of claims 7 to 9, characterized in that: An outer covering layer is arranged on the outer side of the outermost linear winding among the multiple linear winding layers.

Images