A minimally invasive bone harvesting device

Abstract

The present invention discloses a minimally invasive bone harvesting device, which relates to the technical field of medical devices and includes: a cutting tool, the cutting tool includes a tubular tool body, a cutting edge is provided at the cutting end of the tool body, the cutting edge includes a first cutting edge and a second cutting edge, the first cutting edge is serrated, and the orientation of the first cutting edge is parallel to the axial direction of the tool body; the other end of the tool body is the second end, and the second cutting edge inclines towards the inner side of the tool body; a rotating collection bin, the second end is connected to one end of the rotating collection bin, and the bone tissue obtained by cutting with the cutting tool can move through the inside of the tool body into the rotating collection bin; a power component, the power component is used to drive the rotating collection bin and the cutting tool to rotate around the axis of the tool body. By designing the second cutting edge on the cutting tool, strip-shaped bone blocks can be obtained, and the power component drives the cutting tool and the rotating collection bin to rotate, so as to achieve the purpose of obtaining complete strip-shaped bone blocks in minimally invasive autologous bone transplantation surgery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a minimally invasive bone harvesting device. Background Art

[0002] Autologous bone transplantation refers to obtaining bone tissue from a suitable bone harvesting site of the patient himself and then transplanting it to the bone defect site of the patient. Autologous bone is considered the "gold standard" in bone transplantation. Compared with allogeneic bone and artificial bone, it has a lower risk of immune rejection, better biocompatibility, and strong bone growth induction and osteogenic properties. It has always been the first choice for orthopedic surgeries such as nonunion, bone defect, bone tumor, spinal and joint fusion.

[0003] Reducing the complications of the donor site is the current clinical focus of autologous bone transplantation. In traditional open autologous bone transplantation surgery, in order to obtain autologous bone graft materials, the bone surface needs to be completely exposed, resulting in a high incidence of donor site complications. A minimally invasive bone tissue surgical device proposed in the invention patent CN108618825A uses a drive control system to drive a sleeve and a cutter head with a small diameter to cut (or grind) bone tissue, and quickly and directionally transports granular or muddy bone tissue to a rotating collection bin through a spiral conveying part connected to the cutter head to achieve the function of collecting autologous bone. Compared with traditional open surgery, this device can achieve minimally invasive bone harvesting and reduce the complications of the donor site. However, limited by its structural design, this device cannot obtain strip-shaped bone blocks in a minimally invasive environment. Minimally invasive autologous bone transplantation surgery is an effective method to reduce donor site complications, but how to obtain strip-shaped bone blocks in minimally invasive autologous bone transplantation surgery is an urgent problem to be solved in current clinical practice. Summary of the Invention

[0004] The purpose of the present invention is to provide a minimally invasive bone harvesting device to solve the problems existing in the above-mentioned prior art and to obtain strip-shaped bone blocks in minimally invasive autologous bone transplantation surgery.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a minimally invasive bone harvesting device, including:

[0007] A cutting tool, the cutting tool includes a tubular tool body, a cutting edge is provided at the cutting end of the tool body, the cutting edge includes a first cutting edge and a second cutting edge, the first cutting edge is serrated, and the orientation of the first cutting edge is parallel to the axial direction of the tool body; the other end of the tool body is a second end, the second cutting edge inclines towards the inside of the tool body, the second cutting edge is within the axial projection range of the tool body, the first cutting edge is used for cutting bone tissue, the second cutting edge is used for separating bone tissue, and the first cutting edge and the second cutting edge are used in combination to obtain bone tissue;

[0008] A rotating collection bin, the second end of which is connected to one end of the rotating collection bin, and the bone tissue obtained by the cutting of the cutting tool can move through the interior of the tool body to the inside of the rotating collection bin, and the rotating collection bin is used for accommodating bone tissue;

[0009] A power component, which is used to drive the rotating collection bin and the cutting tool to rotate around the axis of the tool body, and generates a transmission force for the bone tissue in the tool body to move towards the second end of the tool body through the rotation of the second cutting edge, so that the bone tissue in the tool body moves from the tool body to the inside of the rotating collection bin.

[0010] Preferably, the power component includes a housing, a driving motor and a control switch. The housing is a gun-shaped housing, the driving motor is fixedly arranged in the housing, a motor fixing frame is arranged in the housing, and the driving motor is fixedly connected to the motor fixing frame. The control switch is arranged on the outer wall of the housing, and the control switch is used to control the opening and closing and the output power of the driving motor;

[0011] The other end of the rotating collection bin is detachably connected to one end of a connecting piece, the other end of the connecting piece is connected to the motor fixing frame through a thrust bearing, the connecting piece is arranged in the housing, and the connecting piece is rotationally matched with the housing through a flat ball bearing, and the flat ball bearing is closer to the cutting tool than the thrust bearing, and the output shaft of the driving motor is in transmission connection with the connecting piece.

[0012] Preferably, the rotating collection bin is connected to the connecting piece by a reverse thread.

[0013] Preferably, taking the cross-section at the connection of the second cutting edge and the tool body as a reference plane, the angle between the second cutting edge and the reference plane is A, and 0° ≤ A < 90°.

[0014] Preferably, the number of the second cutting edges is several; when the number of the second cutting edges is at least two, all the second cutting edges are circumferentially distributed along the tool body, and there is a gap between any two adjacent second cutting edges; the proportion of all the second cutting edges in the circumference of the cutting end in the circumferential direction of the tool body is 5% - 85%.

[0015] Preferably, a pressure sensor is clamped between the thrust bearing and the connecting piece, an alarm module is arranged on the housing, and a controller is fixedly arranged in the housing. The pressure sensor and the alarm module are respectively electrically connected to the controller.

[0016] Preferably, the pipe diameters at all parts of the tool body are the same.

[0017] Preferably, the tool body is in the shape of a conical tube, and the diameter of the tool body gradually increases from the cutting end to the other end of the tool body; the taper of the tool body is 0° to 45°.

[0018] Preferably, the length of the tool body is 20 mm - 180 mm, the outer diameter of the cutting end of the tool body is 2 mm - 20 mm, and the wall thickness of the tool body is 0.2 mm - 2 mm.

[0019] Preferably, the connection part of the second cutting edge and the tool body is closer to or farther from the second end than the tip of the first cutting edge.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The minimally invasive bone harvesting device of the present invention abandons the designs of the cutting tool and spiral transmission of the existing minimally invasive bone tissue surgery devices. By designing the second cutting edge on the cutting tool, strip-shaped bone blocks can be obtained, and power transmission is achieved through the transmission design of the connecting piece, so as to achieve the purpose of obtaining complete strip-shaped bone blocks in minimally invasive autologous bone transplantation surgery.

[0022] Furthermore, during use, by swinging the cutting tool radially, the second cutting edge can cut off the roots of the obtained strip-shaped bone blocks, facilitating the root cutting operation when taking strip-shaped bone blocks.

[0023] Furthermore, during use, the second cutting edge of the minimally invasive bone harvesting device of the present invention can also play a role in feeding. The angle design of the second cutting edge bent backward (i.e., the end of the tool body away from the cutting end) provides an upward force for material transmission, which can assist the strip-shaped bone blocks in the tool to be transmitted backward along the inner wall of the sleeve to the rotary collection bin, making the feeding smoother and faster.

[0024] Furthermore, during use, the second cutting edge of the minimally invasive bone harvesting device of the present invention can also support the obtained strip-shaped bone blocks in the tool. In actual operation, when the conventional trephine structure transfers bone tissue, the bone tissue in the trephine often falls off. However, the structure design of the second cutting edge bent inward and backward in the present invention can well support the strip-shaped bone blocks in the multi-dimensional cutting tool, avoiding the falling off of the cut strip-shaped bone blocks.

[0025] Furthermore, since the present invention abandons the designs of the cutting tool and spiral transmission of the existing minimally invasive bone tissue surgery devices, the minimally invasive bone harvesting device of the present invention can obtain more bone mass through a smaller incision. The present invention can better retain the good osteogenic properties of autologous bone materials, reduce the mechanical movement and heat generated by tool grinding and screw channel transmission, which will damage the osteogenic active components in autologous bone, and completely retain the internal bone tissue structure.

[0026] Furthermore, during the operation of the present invention, the rotary collection bin rotates coaxially with the cutting tool. The materials collected by the cutting tool can be stored in the rotary collection bin, which can avoid the defects of single collection of traditional tools, achieve multiple collections, and improve the efficiency of bone extraction.

[0027] Furthermore, the rotary collection bin and the connecting piece are detachably connected by reverse threads, which is convenient for rotation and disassembly, and can meet the requirements of detachable connection and the fastening connection requirements of the rotary collection bin at the same time.

[0028] Furthermore, the flat ball bearing is closer to the cutting tool than the thrust bearing. The combination of the front-mounted flat ball bearing and the rear-mounted thrust bearing can synchronously rotate the rotary collection bin and the cutting tool while reducing the axial and radial reaction forces caused by cutting, ensuring the axial and radial runout of the rotary collection bin and the cutting tool, improving the axial and radial accuracy, and strengthening the cancellation of the cutting swing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the cutting tool in the minimally invasive bone extraction device according to Embodiment 1 of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the cutting tool in the minimally invasive bone extraction device according to Embodiment 1 of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the minimally invasive bone extraction device according to Embodiment 1 of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the minimally invasive bone extraction device according to Embodiment 1 of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the minimally invasive bone extraction device according to Embodiment 1 of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the cutting tool in the minimally invasive bone extraction device according to Embodiment 2 of the present invention;

[0036] Wherein:

[0037] 100. Cutting tool;

[0038] 200. Minimally invasive bone extraction device;

[0039] 1. Tool body

[0040] 2. First cutting edge

[0041] 3. Second cutting edge

[0042] 5. Rotating collection bin

[0043] 6. Outer shell

[0044] 7. Connecting piece

[0045] 8. Thrust bearing

[0046] 9. Plain ball bearing Detailed implementation mode

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] The purpose of the present invention is to provide a minimally invasive bone harvesting device to solve the problems existing in the above-mentioned prior art, so as to obtain strip-shaped bone / massive bone in minimally invasive autologous bone transplantation surgery.

[0049] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0050] Embodiment 1

[0051] As shown in Figures 1 to 5 this embodiment provides a minimally invasive bone harvesting device 200, including:

[0052] A cutting tool 100, the cutting tool 100 includes a tubular tool body 1, a cutting edge is provided at the cutting end of the tool body 1, the cutting edge includes a first cutting edge 2 and a second cutting edge 3, the first cutting edge 2 is serrated, and the orientation of the first cutting edge 2 is parallel to the axial direction of the tool body 1; the other end of the tool body 1 is the second end, the second cutting edge 3 inclines towards the inside of the tool body 1, the second cutting edge 3 partially blocks the internal channel of the tool body 1, the second cutting edge 3 is within the axial projection range of the tool body 1, the first cutting edge 2 is used for cutting bone tissue, the second cutting edge 3 is used for separating bone tissue, and the first cutting edge 2 and the second cutting edge 3 are used in combination to obtain bone tissue;

[0053] The rotating collection bin 5, the second end of which is connected to one end of the rotating collection bin 5, and the bone tissue obtained by cutting with the cutting tool 100 can move through the interior of the tool body 1 into the rotating collection bin 5, and the rotating collection bin 5 is used to accommodate the bone tissue;

[0054] A power component, which is used to drive the rotating collection bin 5 and the cutting tool 100 to rotate around the axis of the tool body 1, and generates a transmission force for the bone tissue in the tool body 1 to move towards the second end of the tool body 1 through the rotation of the second cutting edge 3, so that the bone tissue in the tool body 1 moves from the tool body 1 into the rotating collection bin 5.

[0055] It should be noted that in this embodiment, the second cutting edge 3 also inclines towards the second end of the tool body 1. In actual application, the second cutting edge 3 can also be inclined towards the inner side of the tool body 1 and away from the second end; however, in this embodiment, making the second cutting edge 3 incline towards the inner side and the second end of the tool body 1 has better bone extraction efficiency during bone extraction.

[0056] In this embodiment, the connection position of the second cutting edge 3 and the tool body 1 is closer to the second end of the tool body 1 than the tip of the first cutting edge 2.

[0057] The minimally invasive bone extraction device 200 of this embodiment abandons the designs of the cutting tool and spiral transmission of the existing minimally invasive bone tissue surgery device, realizes the acquisition of strip-shaped bone blocks through the design of the second cutting edge 3 on the cutting tool 100, and drives the cutting tool 100 and the rotating collection bin 5 to rotate through the power component, so as to achieve the purpose of obtaining complete strip-shaped bone blocks in minimally invasive autologous bone transplantation surgery.

[0058] It should be noted that the rotating collection bin 5 rotates together with the cutting tool 100 during the working process. The materials collected by the cutting tool 100 can be stored in the rotating collection bin 5, which can avoid the defect that the traditional tool needs to stop cutting for an aggregate collection once the material storage inside the tool is full. The rotating collection bin 5 has a large capacity and can realize taking out the aggregates in the rotating collection bin 5 after multiple collections, improving the bone extraction efficiency.

[0059] In an optional solution of this embodiment, preferably, the diameter of the end of the rotating collection bin 5 close to the cutting tool 100 is larger than the diameter of the second end of the cutting tool 100, and a safety limit step is formed at the end of the rotating collection bin 5 close to the cutting tool 100. The safety limit step formed at the connection between the tool body 1 and the rotating collection bin 5 can allow the tool to enter the patient's bone tissue, but restricts the entry of large-diameter components such as the rotating collection bin 5, ensuring the safety of the surgery.

[0060] In an alternative embodiment of the present embodiment, preferably, the power component includes a housing 6, a drive motor, and a control switch. The housing 6 is a gun-shaped housing. The drive motor is fixedly arranged inside the housing 6. There is a motor fixing bracket inside the housing 6, and the drive motor is fixedly connected to the motor fixing bracket. The control switch is arranged on the outer wall of the housing 6 and is used to control the opening and closing and output power of the drive motor;

[0061] The other end of the rotary collection bin 5 is threadedly connected in reverse with one end of the connecting piece 7. The other end of the connecting piece 7 is connected to the motor fixing bracket through a thrust bearing 8. The connecting piece 7 is arranged inside the housing 6, and the connecting piece 7 is rotationally matched with the housing 6 through a flat ball bearing 9. And the flat ball bearing 9 is closer to the cutting tool 100 than the thrust bearing 8. The output shaft of the drive motor is in transmission connection with the connecting piece 7 so that the drive motor can drive the connecting piece 7, the rotary collection bin 5, and the cutting tool 100 to rotate.

[0062] In this embodiment, the detachable connection with reverse threads between the rotary collection bin 5 and the connecting piece 7 is convenient for both rotation and disassembly, and at the same time meets the requirements of detachable connection and the fastening connection of the rotary collection bin 5.

[0063] The flat ball bearing 9 is closer to the cutting tool 100 than the thrust bearing 8, that is, the combination of the front-mounted flat ball bearing 9 and the rear-mounted thrust bearing 8 realizes the synchronous rotation of the rotary collection bin 5 and the cutting tool 100, while reducing the axial and radial reaction forces caused by cutting, ensuring the axial and radial runout of the rotary collection bin 5 and the cutting tool 100, improving the axial and radial accuracy, and strengthening the cancellation of the cutting swing force.

[0064] Since the second cutting edge 3 in this embodiment inclines towards the inner side of the tool body 1 and the end of the tool body 1 away from the cutting end, during the working process of the cutting tool 100, the rotating second cutting edge 3 can play the following three roles:

[0065] (1) Feeding function. The angles at which the second cutting edge 3 bends inward and backward (i.e., the end of the tool body 1 away from the cutting end) provide an upward force for the transmission of the material (the cut aggregate), that is, provide a force for the movement of the material in the tool body 1 towards the end of the tool body 1 away from the cutting end, and can assist the strip-shaped bone blocks in the tool to be transmitted backward along the inner wall of the sleeve to the rotary collection bin 5, making the feeding smoother and faster;

[0066] (2) Root cutting, that is, cutting off the connection between the strip-shaped bone mass in the cutting tool and the surrounding bone tissue. Conventional trephine structures can drill strip-shaped bone masses, but how to completely remove the strip-shaped bone mass from the bone tissue being taken is a technical difficulty, and the second cutting edge 3 that cuts inward can well solve this problem. After obtaining a sufficient amount of strip-shaped bone mass through the first cutting edge 2 that cuts vertically and entering the sleeve, by swinging the cutting tool, the second cutting edge 3 that cuts inward at the front end of the cutting tool cuts the root of the strip-shaped bone mass from the horizontal direction, cutting off the connection between the root of the strip-shaped bone mass and the surrounding bone tissue, thereby obtaining a complete strip-shaped autologous bone;

[0067] (3) Supporting function, the second cutting edge 3 can support the strip-shaped bone mass that has been obtained in the cutting tool. In actual operation, in the conventional trephine structure, the bone tissue in the trephine often falls off. In the present invention, the structural design in which the second cutting edge 3 bends inward and backward can well support the strip-shaped bone mass in the multi-dimensional cutting tool 100, avoiding the falling off of the cut strip-shaped bone mass.

[0068] For the above three aspects of the function of the second cutting edge 3, the setting parameter of the inclination angle of the second cutting edge 3 is the key. A reasonable inclination angle setting can realize material transmission and control the transmission speed, control the bone taking amount, and prevent bone tissue from blocking or falling in the cutting tool. Based on a large amount of experimental data of the applicant, with the cross-section at the connection of the second cutting edge 3 and the tool body 1 as the reference plane, the included angle (i.e., Figure 2 the A angle in ) of the second cutting edge 3 that cuts inward with respect to the reference plane is within a suitable range of A, and 0° ≤ A < 90°.

[0069] It is worth noting that in actual applications, the number of the second cutting edges 3 can be adaptively adjusted according to needs, such as setting it to two, three or even more; when the number of the second cutting edges 3 is at least two, all the second cutting edges 3 are circumferentially distributed along the tool body, and there is a gap between any two adjacent second cutting edges 3; and regardless of the total number of the second cutting edges 3, the proportion of all the second cutting edges 3 in the circumference of the cutting end in the circumferential direction of the tool body 1 is 5% - 85%.

[0070] In this embodiment, the tool body 1 is a tapered tube, and the diameter of the tool body 1 gradually increases from the cutting end to the other end of the tool body 1; in this embodiment, the taper of the tool body 1 is 0° - 45°. The purpose of making the tool body 1 a tapered tube in this embodiment is to improve the smoothness of the transmission of the strip-shaped bone mass in the tool body 1 during bone taking and avoid blockage of the strip-shaped bone mass in the tool body 1. In actual applications, those skilled in the art can adaptively adjust the change of the diameter of the tool body 1 according to actual needs, for example, the diameter of each part of the tool body 1 can also be made the same, that is, the tool body adopts a straight tube.

[0071] In an alternative embodiment of the present embodiment, preferably, the length of the tool body 1 is 20 mm - 180 mm, the outer diameter of the cutting end of the tool body 1 is 2 mm - 20 mm, and the wall thickness of the tool body 1 is 0.2 mm - 2 mm.

[0072] The outer diameter of the cutting end of the tool body 1 being 2 mm - 20 mm is for the comprehensive consideration of achieving a small incision and obtaining a complete strip of bone. At this outer diameter, bone extraction can be achieved with a small incision, and a complete strip of bone that meets the bone grafting requirements can also be obtained. The length of the tool body 1 is set to 20 mm - 180 mm, considering that this length range can meet the bone extraction requirements of different donor sites.

[0073] In an alternative embodiment of the present embodiment, preferably, a pressure sensor is clamped between the thrust bearing 8 and the connecting member 7, an alarm module is provided on the housing 6, and a controller is fixedly provided inside the housing 6; the pressure sensor, the drive motor, and the alarm module are respectively electrically connected to the controller; the pressure sensor is used to detect and identify the pressure conducted from the tool body 1 to the thrust bearing 8.

[0074] The purpose of setting the pressure sensor is as follows:

[0075] Human bones are divided into cortical bone and cancellous bone, and the hardness of cortical bone is generally greater than that of cancellous bone. In the specific bone extraction operation, the operator needs to apply a force to the minimally invasive bone extraction device to make the minimally invasive bone extraction device cut the bone tissue. The front end of the cutting end of the tool body 1 will receive a reaction force from the part to be cut, and this force is transmitted to the pressure sensor; when the cutting end of the tool body 1 cuts into the cortical bone, because the cortical bone is harder, the operator needs to apply a greater force to the device to cut the bone tissue. When the force detected by the pressure sensor is greater than the set value, the controller will control the alarm module to send an alarm signal and automatically turn off the drive motor to cut off the power output to prevent the tool from penetrating the cortical bone and causing unnecessary damage; the alarm module can specifically use a buzzer.

[0076] Embodiment Two

[0077] As Figure 6 shown, the present embodiment provides a minimally invasive bone extraction device 200. The minimally invasive bone extraction device 200 of the present embodiment is basically the same in structure and principle as the minimally invasive bone extraction device 200 of Embodiment One, and the difference is only that:

[0078] In the tool body 1 of this embodiment, the connection between the second cutting edge 3 and the tool body 1 is farther from the second end than the tip of the first cutting edge 2, and the distance between the connection between the second cutting edge 3 and the tool body 1 and the tip of the first cutting edge 2 is less than or equal to two-thirds of the diameter of the cutting end of the tool body 1. When taking bones, the second cutting edge 3 is used as the main cutting edge to increase the transmission speed of the cut bone aggregate in the tool body 1; the tool body 1 of this embodiment adopts a straight pipe.

[0079] In the description of the present invention, it should be noted that in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0080] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A minimally invasive bone harvesting device, characterized in that: include: A cutting tool, the cutting tool comprising a tubular tool body, a cutting end of the tool body being provided with a cutting edge, the cutting edge comprising a first cutting edge and a second cutting edge, the first cutting edge being serrated, and the first cutting edge being oriented parallel to the axial direction of the tool body; the other end of the tool body being the second end, the second cutting edge being inclined toward the inner side of the tool body, the second cutting edge being located within the axial projection range of the tool body, the first cutting edge being used for cutting bone tissue, the second cutting edge being used for separating bone tissue, and the first cutting edge and the second cutting edge being used in combination to obtain bone tissue; A rotating collection bin, wherein the second end is connected to one end of the rotating collection bin, and the bone tissue obtained by cutting the cutting tool can be moved into the rotating collection bin through the interior of the tool body, and the rotating collection bin is used to accommodate the bone tissue; a power component, the power component is used to drive the rotating collection bin and the cutting tool to rotate around the axis of the tool body, and generate a transmission force for the bone tissue in the tool body to move toward the second end of the tool body through the rotation of the second cutting edge, so that the bone tissue in the tool body moves from the tool body to the rotating collection bin; The cross section of the connection between the second cutting edge and the tool body is taken as the reference plane, the angle between the second cutting edge and the reference plane is A, and 0°≤A<90°; during use, the cutting tool is swung radially, and the second cutting edge is used to cut the root of the strip bone block horizontally to cut off the root of the strip bone block.

2. The minimally invasive bone harvesting device according to claim 1, characterized in that: The power component includes a housing, a drive motor and a control switch. The housing is a gun-type housing. The drive motor is fixedly arranged in the housing. A motor fixing frame is arranged in the housing, and the drive motor is fixedly connected to the motor fixing frame. The control switch is arranged on the outer wall of the housing. The control switch is used to control the opening and closing and output power of the drive motor. The other end of the rotating collection bin is detachably connected to one end of the connecting piece, and the other end of the connecting piece is connected to the motor fixing frame via a thrust bearing. The connecting piece is arranged in the outer shell, and the connecting piece is rotatably matched with the outer shell via a plane ball bearing, and the plane ball bearing is closer to the cutting tool than the thrust bearing, and the output shaft of the driving motor is transmission-connected to the connecting piece.

3. The minimally invasive bone harvesting device according to claim 2, characterized in that: The rotating collection bin is reversely threadedly connected to the connecting piece.

4. The minimally invasive bone harvesting device according to claim 1, characterized in that: The number of the second cutting edges is several; when the number of the second cutting edges is at least two, all of the second cutting edges are distributed along the circumference of the tool body, and there is a gap between any two adjacent second cutting edges; the proportion of the circumference of the cutting end occupied by all of the second cutting edges in the circumference of the tool body is 5%-85%.

5. The minimally invasive bone harvesting device according to claim 2, characterized in that: A pressure sensor is sandwiched between the thrust bearing and the connecting member, an alarm module is arranged on the housing, a controller is fixedly arranged in the housing, and the pressure sensor and the alarm module are electrically connected to the controller respectively.

6. The minimally invasive bone harvesting device according to claim 1, characterized in that: The tool body is a tapered tube, and the diameter of the tool body gradually increases from the cutting end to the other end of the tool body; the taper of the tool body is 0°~45°.

7. The minimally invasive bone harvesting device according to claim 1, characterized in that: The length of the tool body is 20mm-180mm, the outer diameter of the cutting end of the tool body is 2mm-20mm, and the wall thickness of the tool body is 0.2mm-2mm.

8. The minimally invasive bone harvesting device according to claim 1, characterized in that: The connection between the second cutting edge and the tool body is closer to or farther from the second end than the tip of the first cutting edge.

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