Minimally invasive bone taking equipment

Abstract

The invention discloses minimally invasive bone taking equipment and relates to the technical field of medical instruments, the minimally invasive bone taking equipment comprises a drill body, a shell, a driving device and a collecting device, a hollow drill bit is arranged at the far end of the drill body, and a cutting edge is arranged at the far end of the drill bit; the drill body is rotatably arranged in the shell in a penetrating mode, and the drill bit extends out of the far end of the shell. The collecting device comprises a sealing connecting piece, a collecting part and a connecting pipe, and the sealing connecting piece is annular and is fixedly arranged at the near end of the shell; the near end of the drill body is arranged in the sealing connecting piece in a penetrating mode, and dynamic sealing is formed between the sealing connecting piece and the drill body. The collecting part is provided with a near-end opening and is detachably and hermetically connected to the sealing connecting piece through the near-end opening; one end of the connecting pipe is communicated to the collecting part, and the other end is connected with a negative pressure source; the inner channel of the drill body, the inner cavity of the collecting part and the connecting pipe jointly form a continuous negative pressure channel so that the negative pressure source can suck blocky bone tissue drilled by the drill bit into the collecting part. According to the invention, minimally invasive collection of blocky bones is realized.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a minimally invasive bone harvesting device. Background Technology

[0002] Autologous bone grafting is a common method for repairing bone defects. Traditional bone harvesting methods require open surgery, which is highly invasive and prone to complications. To reduce trauma, some minimally invasive bone harvesting devices have emerged. These devices utilize a drive control system to operate a small-diameter sleeve and blade to cut (or grind) bone tissue. A spiral conveyor connected to the blade rapidly and directionally transports granular or mud-like bone tissue to a collection chamber, thus collecting autologous bone. While this effectively solves the problems of traditional autologous bone grafting surgery and achieves minimally invasive bone harvesting, the device requires cutting (or grinding) the cancellous bone into bone chips before conveying them through the spiral channel. This allows for the directional delivery of the cut (or ground) bone, resulting in only fine granular or mud-like bone graft material. It cannot collect large blocks of bone tissue, and the collection process is prone to clogging, failing to meet the clinical needs of minimally invasive autologous bone grafting. Other related technologies employ negative pressure devices to collect bone powder. However, these devices only collect fine bone powder shavings from the drill, not larger bone fragments. Therefore, they fail to address the problems inherent in existing minimally invasive bone tissue treatment devices. Summary of the Invention

[0003] The purpose of this invention is to provide a minimally invasive bone harvesting device to solve the problems existing in the prior art and achieve minimally invasive harvesting of bone blocks.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a minimally invasive bone harvesting device, comprising: a drill body, a housing, a driving device, and a collecting device. The drill body is a hollow tubular structure with a hollow drill bit at its distal end, and the distal end of the drill bit is provided with a cutting edge. The drill body is rotatably inserted into the housing, and the drill bit extends from the distal end of the housing. The driving device is disposed within the housing and is connected to the drill body for driving the drill body to rotate. The collecting device comprises: a sealing connector, a collecting part, and a connecting tube. The sealing connector is annular and fixedly disposed at the proximal end of the housing. The proximal end of the drill body passes through the sealing connector, and a dynamic seal is formed between the sealing connector and the drill body; the collecting part has a proximal opening, which is detachably and sealingly connected to the sealing connector through the proximal opening; one end of the connecting pipe is connected to the collecting part, and the other end is used to connect to a negative pressure source; wherein, the internal channel of the drill body, the inner cavity of the collecting part, and the connecting pipe together constitute a continuous negative pressure channel so that the negative pressure source can draw the block bone tissue drilled by the drill bit into the collecting part.

[0005] Preferably, the dynamic sealing structure between the sealing connector and the drill body includes two sealing rings, which are disposed in an annular groove on the inner side of the sealing connector.

[0006] Preferably, the collecting part and the sealing connector are connected by a thread.

[0007] Preferably, the collecting part and the sealing connector are connected by a snap-fit, and a sealing ring is provided on the connecting end face of the sealing connector or the collecting part. When the two are snapped together, the sealing ring is pressed to achieve a seal.

[0008] Preferably, the sealing connector has an annular cavity, and the proximal end of the sealing connector is provided with a plurality of filter holes arranged along the annular shape. The filter holes connect the collection cavity in the collection part and the annular cavity. The distal end of the sealing connector is provided with an air extraction port, one end of which is connected to the collection cavity, and the other end is sealed to the connecting pipe.

[0009] Preferably, the housing is a gun-type structure, including a handle portion extending along a first direction and a barrel portion connected to the handle portion and extending along a second direction, wherein the first direction and the second direction intersect; the drive device is disposed in the handle portion; the drill body is disposed in the barrel portion; and the power output shaft of the drive device is connected to the drill body via a bevel gear transmission structure.

[0010] Preferably, the connecting tube passes through the handle portion.

[0011] Preferably, the collecting part includes a distal cavity and a proximal cavity; the distal cavity is detachably connected to the sealing connector; the proximal cavity is detachably connected to the proximal end of the distal cavity by a thread; a filter structure is provided between the distal cavity and the proximal cavity; the proximal cavity constitutes a receiving chamber for accommodating artificial bone material.

[0012] Preferably, the drill body is provided with rotational support by bearings disposed within the housing.

[0013] Preferably, the diameter of the filter pores is 0.5-5 mm.

[0014] The present invention achieves the following technical effects compared to the prior art: This embodiment integrates a hollow drill body, a drive device, and a negative pressure-based collection device to construct a continuous, sealed negative pressure channel from the drill bit tip to the collection section. When the drill bit rotates and cuts off blocky bone tissue, the internal channel of the drill body immediately becomes a negative pressure transmission path, using the pressure difference to draw in the cut blocky tissue as a whole, avoiding the secondary mechanical fragmentation and friction required by traditional spiral conveying methods. This design directly utilizes negative pressure to aspirate blocky bone tissue without pre-treating the bone tissue into granules or mud, thus preserving the original morphology and internal structure of the bone block to the maximum extent, reducing thermal and mechanical damage to osteogenic active components, and ultimately achieving efficient acquisition of blocky autologous bone suitable for structural transplantation through a minimally invasive channel, solving the fundamental problem that existing technologies can only obtain fragmented materials. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the minimally invasive bone harvesting device provided in an embodiment of the present invention; Figure 2 A cross-sectional view of the sealing connector and the collection section; Figure 3 This is a schematic diagram of the shell structure; Figure 4 This is a structural schematic diagram of the sealing connector and a portion of its housing; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the collection section; Figure 7 This is a structural schematic diagram of the sealing connector; Figure 8 This is a schematic diagram of the drill bit structure; In the diagram: 1-Drill body; 2-Drill bit; 3-Drive device; 4-Housing shell; 5-Sealing connector; 6-Collection section; 7-Connecting pipe; 8-Driven bevel gear; 9-Driven bevel gear; 10-Sealing ring; 11-Annular groove; 12-Annular cavity; 13-Evacuation port; 14-Filter hole; 15-Barrel section; 16-Handle section; 17-Bearing; 18-Arc-shaped retaining strip; 19-Positioning groove; 20-Open end; 21-Arc-shaped retaining groove; 22-Positioning protrusion; 23-Snap-fit ​​groove; 24-Snap-fit ​​strip. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide a minimally invasive bone harvesting device to solve the problems existing in the prior art and facilitate minimally invasive harvesting of bone blocks.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In this invention, to clearly describe the orientation and connection relationships between the components, the following definitions are adopted: Distal end: refers to the end of the device that is away from the operator and close to or in contact with the patient's surgical site when the device is in normal use.

[0021] Proximal end: refers to the end closest to the operator when the equipment is in normal use.

[0022] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0023] Example 1 This invention provides a minimally invasive bone harvesting device, comprising: a drill body 1, a housing 4, a driving device 3, and a collecting device. The drill body 1 is a hollow tubular structure with a hollow drill bit 2 at its distal end, the distal end of which has a cutting edge. The drill body 1 is rotatably inserted into the housing 4, and the drill bit 2 extends from the distal end of the housing 4. The driving device 3 is disposed within the housing 4 and is connected to the drill body 1 for driving the drill body 1 to rotate. The collecting device includes: a sealing connector 5, a collecting part 6, and a connecting pipe 7. The sealing connector 5 is annular and fixedly disposed within the housing 4. The proximal end of the housing 4; the proximal end of the drill body 1 passes through the sealing connector 5, and a dynamic seal is formed between the sealing connector 5 and the drill body 1; the collecting part 6 has a proximal opening, which is detachably and sealingly connected to the sealing connector 5 through the proximal opening; one end of the connecting pipe 7 is connected to the collecting part 6, and the other end is used to connect to the negative pressure source; wherein, the internal channel of the drill body 1, the inner cavity of the collecting part 6 and the connecting pipe 7 together constitute a continuous negative pressure channel so that the negative pressure source can draw the block bone tissue drilled by the drill bit 2 into the collecting part 6.

[0024] This embodiment integrates the hollow drill body 1, the drive device 3, and the negative pressure-based collection device to construct a continuous, closed negative pressure channel from the end of the drill bit 2 to the collection section 6. When the drill bit 2 rotates and cuts off blocky bone tissue, the internal channel of the drill body 1 immediately becomes a negative pressure transmission path, using the pressure difference to suck in the cut blocky tissue as a whole, avoiding the secondary mechanical crushing and friction required by traditional spiral conveying methods. This design directly uses negative pressure to aspirate blocky bone tissue without pre-treating the bone tissue into granules or mud, thus preserving the original morphology and internal structure of the bone block to the maximum extent, reducing thermal and mechanical damage to osteogenic active components, and ultimately achieving efficient acquisition of blocky autologous bone suitable for structural transplantation through a minimally invasive channel, solving the fundamental problem that existing technologies can only obtain fragmented materials.

[0025] Most importantly, this application uses "a dynamic seal between the sealing connector 5 and the drill body 1" and "the collection part 6 is sealed to the sealing connector 5" to ensure the airtightness of the negative pressure channel, so that the negative pressure generated by the negative pressure source can be applied to the end of the drill body 1 (i.e., the drill bit 2). This is beneficial for the negative pressure source to complete the suction of the block bone tissue at a lower power, reducing noise and vibration during the bone removal process, thereby reducing interference to the patient, and making it possible to use negative pressure to drive the block bone tissue to move to the collection part 6.

[0026] In some embodiments, the dynamic sealing structure between the sealing connector 5 and the drill body 1 includes two sealing rings 10, which are disposed in the annular groove 11 inside the sealing connector 5.

[0027] In this embodiment, two sealing rings 10 are provided inside the sealing connector 5, forming a series dynamic sealing structure. When the drill body 1 rotates at high speed, the first sealing ring 10 undertakes the main dynamic sealing and pressure isolation functions, while the second sealing ring 10 serves as a redundant seal and dust barrier. The double sealing ring 10 design forms two leakage prevention barriers, significantly reducing the risk of the entire negative pressure system losing pressure due to single-point seal failure. At the same time, a reasonable selection of sealing rings 10 (such as wear-resistant and low-friction materials) can effectively control rotational resistance and frictional heat generation while ensuring airtightness, preventing heat from being conducted to the surgical area through the drill body 1. This structure achieves long-term stable high airtightness in rotating moving parts in a simple and reliable mechanical way, which is the key foundation for maintaining efficient negative pressure suction.

[0028] Of course, dynamic sealing is not limited to double-lip seals. Alternatives may include using a single-layer reinforced seal.

[0029] In some embodiments, the collecting part 6 and the sealing connector 5 are threaded together.

[0030] In this embodiment, the collecting part 6 and the sealing connector 5 are fixed by a threaded connection. The threaded connection itself has a sealing function, which helps to simplify the structure of the equipment, for example, eliminating the need for a sealing ring 10. Of course, the airtightness can also be improved by adding a sealing ring 10 between the contact end faces of the collecting part 6 and the sealing connector 5.

[0031] In addition, in other embodiments, the collecting part 6 and the sealing connector 5 are connected by a snap-fit, and a sealing ring 10 is provided on the connecting end face of the sealing connector 5 or the collecting part 6. When the two are snapped together, the sealing ring 10 is pressed to achieve a seal.

[0032] Specifically, the opening end 20 of the collecting part 6 is provided with an arc-shaped retaining strip 18 extending circumferentially, and the sealing connector 5 is provided with an arc-shaped retaining groove 21. In use, the collecting part 6 is moved along the direction close to the sealing connector 5 until the sealing ring 10 is pressed and the arc-shaped retaining strip 18 is aligned with one end of the arc-shaped retaining groove 21. Then, the collecting part 6 is rotated so that one end of the arc-shaped retaining strip 18 can enter from one end of the arc-shaped retaining groove 21. After entering, the collecting part 6 is rotated at a certain angle until it reaches a fixed position, thus achieving the engagement of the two. It should be noted that after reaching the fixed position, the arc-shaped retaining strip 18 and the arc-shaped retaining groove 21 are positioned by the positioning groove 19 and the positioning protrusion 22.

[0033] Furthermore, the two parts can be locked together by the rebound force of the sealing ring 10. That is, the sealing ring 10 here has two functions: sealing and acting as an elastic gasket.

[0034] In some embodiments, the sealing connector 5 has an annular cavity 12. The near end of the sealing connector 5 is provided with a plurality of filter holes 14, which are arranged along the annular shape. The filter holes 14 connect the collection cavity in the collection part 6 and the annular cavity 12. The far end of the sealing connector 5 is provided with an air extraction port 13, one end of which is connected to the collection cavity and the other end is sealed to the connecting pipe 7.

[0035] This embodiment sets up multiple filter holes 14, which avoids the risk of the entire device failing if a single filter hole 14 is blocked by bone blocks. In addition, the multiple filter holes 14 are arranged in a ring around the outlet end of the drill body 1, which allows the negative pressure to act evenly on the outlet end of the drill body 1, making the suction process more stable.

[0036] Of course, the location and form of the filter structure can be substituted. For example, a perforated baffle or filter screen can be placed at or inside the inlet of the collection section 6; or a multi-layer stepped filter can be used to intercept different sizes of tissues from coarse to fine, so as to automatically collect tissues of different sizes. The shape of the filter holes 14 can also be elongated holes, irregular holes, etc., to adapt to different flow fields and filtration requirements.

[0037] The sealing connector 5 specifically includes a proximal assembly and a distal cover plate. The proximal assembly is an annular sleeve shape, with an annular groove 11 on its inner wall to accommodate a sealing ring 10 that forms a dynamic seal with the drill body 1; its proximal end face has multiple filter holes 14 evenly distributed along the annulus, which penetrate the end face and connect the inner cavity of the collection section 6 with the annular cavity 12 formed by the proximal assembly. The distal cover plate is sealed to the distal end face of the proximal assembly, specifically by adhesive bonding, together sealing the annular cavity 12; the air extraction port 13 is formed on or fixed to the distal cover plate, and its channel communicates with the annular cavity 12, and then indirectly communicates with the inner cavity of the collection section 6 through the filter holes 14. When the connecting pipe 7 is connected to the air extraction port 13, the external negative pressure is transmitted sequentially through the connecting pipe 7, the air extraction port 13, the annular cavity 12, and each filter hole 14 to the collection section 6 and the drill body 1.

[0038] This embodiment employs a split-design sealing connector 5, modularly integrating dynamic sealing, filtration, and negative pressure interface functions. This greatly simplifies the machining of individual parts, particularly facilitating the high-precision machining of the annular array of tiny filter holes 14 on the near-end assembly.

[0039] In some embodiments, the housing 4 is a gun-type structure, including a handle portion 16 extending along a first direction and a barrel portion 15 connected to the handle portion 16 and extending along a second direction, the first direction intersecting the second direction; the drive device 3 is disposed in the handle portion 16; the drill body 1 is disposed in the barrel portion 15; the power output shaft of the drive device 3 is connected to the drill body 1 through a bevel gear transmission structure (a driven bevel gear 8 coaxially connected to the drill body 1 and a driving bevel gear 9 coaxially connected to the motor shaft), the drive device 3 being a motor, and the motor having a motor shaft.

[0040] This embodiment designs the device as a gun-like structure and uses bevel gears for spatial reversing transmission. The gun-like structure conforms to the ergonomic principles of handheld surgical instruments. The handle 16 and the barrel 15 form a certain angle (usually close to perpendicular), allowing the operator to perform precise axial feed operations with a natural and stable grip, while also facilitating observation of the working end of the drill bit 2, reducing operator fatigue and errors. The bevel gear transmission efficiently and smoothly converts the longitudinal rotational power of the drive device 3 located in the handle 16 into the lateral rotational power of the drill body 1 within the barrel 15. The layout rationally integrates the power source, transmission mechanism, and working end, placing the device's center of gravity close to the hand, resulting in good operational balance and achieving the flexibility, precision, and stability required for minimally invasive bone harvesting equipment.

[0041] Of course, the transmission method can be replaced with worm gear transmission (which can achieve a larger reduction ratio and self-locking), interleaved shaft helical gear transmission, or flexible transmission elements such as universal joints and synchronous belts, depending on the spatial layout requirements. The housing 4 shape can also be designed as a pen type, straight handle type, etc., depending on the surgical site (such as the oral cavity, spine).

[0042] In some embodiments, the housing 4 is divided into two parts, and the two housing parts 4 are fastened together to form an integral structure. The inner side of the housing 4 is provided with a snap-fit ​​strip 24, and the outer side of the sealing connector 5 is provided with a snap-fit ​​groove 23. After the two housings 4 are fastened together, the snap-fit ​​strip 24 can be snapped into the snap-fit ​​groove 23 to achieve the fixation of the three.

[0043] In some embodiments, the connecting tube 7 passes through the handle portion 16.

[0044] In this embodiment, the connecting tube 7, which connects to the negative pressure source, is integrated and runs through the inside of the device handle 16. This design moves the external hose connection point from the rear of the device to the end or proximal end of the handle, resulting in a higher degree of integration between the entire negative pressure pipeline and the main body of the device. Its beneficial effects include: First, it avoids the external hose from hanging and tangling at the rear of the device (i.e., the end or proximal end of the barrel), significantly improving the clarity of the surgical field and the flexibility of operation, without interfering with the surgeon's hand movements. Second, the internal wiring protects the connecting tube 7, reducing the risk of pipeline detachment or damage due to pulling or squeezing during surgery, thus improving the reliability of the system. Third, the overall appearance is simpler, meeting the cleaning and sterilization requirements of medical devices. This integrated design optimizes human-computer interaction, allowing the surgeon to focus more on the surgical procedure itself.

[0045] In some embodiments, the collecting part 6 includes a distal cavity and a proximal cavity; the distal cavity is detachably connected to the sealing connector 5; the proximal cavity is detachably connected to the proximal end of the distal cavity by a thread; a filter structure is provided between the distal cavity and the proximal cavity; the proximal cavity constitutes a receiving chamber for accommodating artificial bone material.

[0046] This embodiment employs a dual-cavity collection section 6, consisting of a distal cavity and a proximal cavity connected by threads, with a filter structure in between. Its core advantage lies in achieving the acquisition of two materials in a single operation. The distal cavity is primarily used to collect autologous bone fragments or larger bone particles directly aspirated from the drill bit 2. The proximal cavity is designed to house the artificial bone material. When fluids rich in growth factors, such as blood and bone marrow fluid, flow through this cavity under negative pressure, the artificial bone material can fully absorb these bioactive components. This design seamlessly integrates the two surgical steps of autologous bone harvesting and artificial bone pretreatment, obtaining high-quality autologous bone while simultaneously preparing a composite transplant material with superior biological properties, significantly improving the efficiency of a single surgery and overall therapeutic effect.

[0047] In this embodiment, in addition to threads, nested snap-fit ​​connections can also be used for connection. The "accommodation" function of the proximal cavity can be achieved through a built-in porous basket, support, or other removable carrier, facilitating the placement and removal of the artificial bone.

[0048] It should be noted that although the proximal cavity in this embodiment is not on the negative pressure path, in practice it has been found that due to the large amount of growth factor-rich fluids such as blood and bone marrow fluid, some fluid can always enter the proximal cavity. Of course, in order to make the fluid collection efficiency higher, the proximal cavity can be set on the negative pressure path, so that the negative pressure path is sequentially the connecting tube 7, the annular cavity, the proximal cavity and the distal cavity. This requires a through or separate space to connect the annular cavity and the proximal cavity.

[0049] In some embodiments, the drill body 1 is provided with rotational support by a bearing 17 disposed within the housing 4.

[0050] In this embodiment, a bearing 17 is installed inside the housing 4 to support the rotation of the drill body 1. The bearing 17 (such as a deep groove ball bearing 17 or a sliding bearing 17) provides high-precision radial positioning and rotational guidance for the drill body 1. Its beneficial effects are mainly reflected in the following aspects: First, it greatly reduces the frictional resistance and shaking of the drill body 1 during rotation, ensuring the dynamic stability and coaxiality of the drill bit 2 under high-speed rotation, thereby ensuring that the cut bone blocks are of regular shape and have minimal edge damage. Second, the bearing 17 bears the main radial force, avoiding the contamination of the surgical area by wear particles generated by direct friction between the drill body 1 and the housing 4, and also improving the service life of the equipment. Third, the smooth and low-resistance rotation helps to reduce the load and energy consumption of the drive device 3, making the equipment operate more quietly and efficiently. Reliable rotational support is the basic mechanical guarantee for the equipment to achieve precise and efficient minimally invasive bone harvesting.

[0051] In some embodiments, the diameter of the filter pore 14 is 0.5-5 mm.

[0052] In this embodiment, the diameter of the filter hole 14 integrated into the sealing connector 5 is limited to the range of 0.5-5 mm. This specific size range is set based on considerations of the physical properties of the target tissue (cancellous bone block, bone granules) and body fluids (blood, bone marrow fluid).

[0053] The size of the filter pores 14 can be adjusted according to the target tissue type. In addition, non-circular pores or combinations of pore sizes can be used to optimize filtration performance.

[0054] In some embodiments, the drill body 1 is a straight pipe, and a tapered pipe is provided at the far end of the straight pipe. A drill bit 2 is provided at the far end of the tapered pipe. The cutting edge on the drill bit 2 is a serrated edge. The drill bit 2 forms a stepped ring drill with a small far-end diameter and a large near-end diameter.

[0055] This stepped trephine structure, through its progressively expanding physical space design, provides an optimized path for the cutting, transfer, and protection of bone tissue. When the small-diameter serrated edge at the distal end of drill bit 2 efficiently cuts away the block of bone tissue, the cut tissue immediately enters a tapered transition space that gradually increases in size. This design produces several beneficial effects: First, the guiding effect of the tapered tube significantly reduces the resistance and friction of the block of bone tissue as it moves proximally within drill body 1, preventing it from tumbling, being squeezed, or undergoing secondary fragmentation within the narrow channel, thus maximizing the preservation of the macroscopic structural integrity of the bone block. Second, the progressively expanding cavity, from a hydrodynamic perspective, facilitates the formation of a more concentrated negative pressure field near the cutting point of drill bit 2, enhancing the ability to "grab" and immediately suction the freshly cut bone block, achieving "cut and go," and greatly shortening the time that bone tissue is exposed to mechanical friction and heat generation. Third, while ensuring sharp cutting, the intermittent tooth structure of the serrated edge is more conducive to heat dissipation and debris removal compared to a continuous edge, further reducing the damage to bone cell activity caused by heat accumulation. Therefore, this embodiment strengthens the core invention objective of protecting bone tissue activity at the physical level through a sophisticated stepped structure and serrated blade design, so that the obtained transplant material is not only of suitable size, but also has better cell viability and osteogenic potential.

[0056] In some embodiments, the drill body 1 is a tapered tube, and a drill bit 2 is provided at the distal end of the tapered tube. The cutting edge on the drill bit 2 is a combined cutting edge, which includes a first cutting edge and a second cutting edge. The first cutting edge is serrated and its orientation is parallel to the axial direction of the drill body. The second cutting edge is inclined towards the inner side of the drill body and is located within the axial projection range of the tool body. The first cutting edge is used to cut bone tissue, and the second cutting edge is used to separate bone tissue. The first and second cutting edges are used in combination to obtain bone tissue. During use, the combined cutting edge can control the particle size of the strip-shaped bone block and cut off its roots through the second cutting edge, which facilitates negative pressure collection of bone tissue.

[0057] In some embodiments, the minimally invasive bone harvesting device provided in this embodiment is a single-use product. Of course, it can also be reused if the sterilization process is sufficient.

[0058] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A minimally invasive bone harvesting device, characterized in that, include: The drill body is a hollow tubular structure with a hollow drill bit at its distal end, and a cutting edge at the distal end of the drill bit. The housing, the drill body being rotatably disposed within the housing, and the drill bit extending from the distal end of the housing; A drive unit is disposed inside the housing and is connected to the drill body for driving the drill body to rotate; Collection device, comprising: A sealing connector, in the form of a ring, is fixedly disposed at the proximal end of the housing; the proximal end of the drill body passes through the sealing connector, and a dynamic seal is formed between the sealing connector and the drill body; A collection section having a proximal opening, which is detachably and sealingly connected to the sealing connector through the proximal opening; A connecting pipe, one end of which is connected to the collection section, and the other end of which is used to connect to a negative pressure source; The internal channel of the drill body, the inner cavity of the collection part, and the connecting pipe together form a continuous negative pressure channel, so that the negative pressure source can draw the blocky bone tissue drilled by the drill bit into the collection part.

2. The minimally invasive bone harvesting device according to claim 1, characterized in that: The dynamic sealing structure between the sealing connector and the drill body includes two sealing rings, which are disposed in an annular groove on the inner side of the sealing connector.

3. The minimally invasive bone harvesting device according to claim 1, characterized in that: The collecting part and the sealing connector are connected by threads.

4. The minimally invasive bone harvesting device according to claim 1, characterized in that: The collecting part and the sealing connector are connected by a snap-fit, and a sealing ring is provided on the connecting end face of the sealing connector or the collecting part. When the two are snapped together, the sealing ring is pressed to achieve a seal.

5. The minimally invasive bone harvesting device according to claim 1, characterized in that: The sealing connector has an annular cavity. The proximal end of the sealing connector is provided with multiple filter holes, which are arranged along the annular shape. The filter holes connect the collection cavity in the collection part and the annular cavity. The distal end of the sealing connector is provided with an air extraction port. One end of the air extraction port is connected to the collection cavity, and the other end is sealed to the connecting pipe.

6. The minimally invasive bone harvesting device according to claim 1, characterized in that: The housing is a gun-type structure, including a handle portion extending along a first direction and a barrel portion connected to the handle portion and extending along a second direction, wherein the first direction and the second direction intersect; the drive device is disposed in the handle portion; the drill body is disposed in the barrel portion; the power output shaft of the drive device is connected to the drill body through a bevel gear transmission structure.

7. The minimally invasive bone harvesting device according to claim 6, characterized in that: The connecting tube passes through the handle portion.

8. The minimally invasive bone harvesting device according to claim 1, characterized in that: The collection section includes a distal cavity and a proximal cavity; the distal cavity is detachably connected to the sealing connector; the proximal cavity is detachably connected to the proximal end of the distal cavity via threads; a filter structure is provided between the distal cavity and the proximal cavity; the proximal cavity constitutes a receiving chamber for accommodating artificial bone material.

9. The minimally invasive bone harvesting device according to claim 1, characterized in that: The drill body is provided with rotational support by bearings disposed within the housing.

10. The minimally invasive bone harvesting device according to claim 5, characterized in that: The diameter of the filter pores is 0.5-5mm.

Images