Micro-fracture instrument suite

Abstract

The utility model discloses a micro fracture instrument suite, which is characterized in that the micro fracture instrument suite comprises a trepanning device and a guide device matched with the trepanning device, the trepanning device comprises a drill bit body and a rod body, the drill bit body comprises a front section, a middle section and a rear section, the front section is provided with a cutting edge, and the middle section is provided with a cutting edge. The rear section is connected with the rod body, and the middle section is in a waisted shape which smoothly contracts from the two ends to the middle. According to the utility model, the guide device and the tapping device are matched with each other, so that the problem of bone debris residue in a perforated hole can be avoided, and the formation of a'bone wall 'of a bone hole is avoided.

Description

Technical Field

[0001] The utility model relates to a microfracture instrument kit. Background Art

[0002] Articular cartilage injury is the destruction of articular cartilage caused by acute trauma or chronic strain, which is quite common clinically. Microfracture surgery is mainly used for treatment to improve the condition, in order to repair the defective cartilage tissue through bone marrow stimulation and infiltration of the wound surface. Traditionally, a conical bone cone commonly used on the market is used. Through the operator's percussion, a hole with a diameter of about 3mm and a depth of 3-4mm is formed on the subchondral bone surface of the defective cartilage, so that the bone marrow blood under the cartilage seeps into the wound surface, forming a fibrous blood clot scaffold, and inducing fibrochondrocyte proliferation through bone marrow stem cells to repair articular cartilage. 1. The bone hole formed by the current instrument is conical with a depth of 3mm, and effective bone marrow blood is not easy to seep out; due to the mechanical action of the conical tip instrument, the microporous structure of the trabeculae is squeezed and deformed, forming a closed "bone wall", which affects the entry and exit of active bone marrow cells, thereby affecting the clinical efficacy. 2. Current instruments are all single-hole forming instruments. Clinically, the treatment of cartilage defects requires the formation of multiple microfracture holes in the cartilage defect area, which requires multiple knocks and multiple pull-outs. It is difficult to ensure the consistency of the direction of the bone holes. It is time-consuming, laborious, imprecise and controllable, and requires a high level of technical experience accumulation; 3. Since the clinical requirement for the hole spacing between the formed bone holes is about 3mm, multiple drillings test the doctor's skills, and the direction of each hole is difficult to control. The hole spacing is too small, which can easily cause microfracture fragmentation and form small bone fragment iatrogenic fractures. Summary of the invention

[0003] In order to solve the above technical problems, the utility model is implemented through the following technical solutions: a microfracture instrument kit, including a hole-opening device and a guiding device matched therewith, the hole-opening device includes a drill body and a rod, the drill body includes a front section, a middle section and a rear section, the front section is provided with a cutting blade, the rear section is connected to the rod, and the middle section is in a waisted state that is rounded from both ends to the middle.

[0004] Preferably, the guide device comprises a guide sleeve, a hole is formed in the guide sleeve, and the shaft of the hole-opening device is inserted into the hole of the guide device; a cone-shaped point is provided at the bone contact end of the guide device.

[0005] Preferably, the shaft includes a flexible section.

[0006] Preferably, the guide device is in the shape of a straight cylinder.

[0007] Preferably, there are a plurality of channels which are arranged parallel to each other.

[0008] Preferably, the number of the holes is 3 to 20 holes, the diameter of each hole is 1.2 to 2.7 mm, and the spacing between the hole walls of adjacent holes is 2 to 4 mm; at the bone contact end of the guide device, the shortest distance between the edge of the hole closest to the boundary of the guide device and the boundary of the guide device is 0.5 to 3 mm.

[0009] Preferably, the guide sleeve includes a straight section and a curved guide section, the curved guide section is curved relative to the straight section, and the curvature of the curved guide section relative to the straight section is 0 to 90°.

[0010] Preferably, the shaft includes a serpentine curved connecting portion, and the microfracture instrument kit also includes a handle, one end of the shaft is connected to the rear section of the drill body, and the other end of the shaft is connected to the handle, the handle includes an electric drive part, and when driven by the electric drive part, the drill body can move axially relative to the channel in the guide device.

[0011] Preferably, the length of the head of the hole-opening device protruding from the head of the guide device is in the range of 3 to 15 mm, and the length of the serpentine curved connecting portion is in the range of 5 to 50 mm.

[0012] Preferably, the rear section of the drill body is integrally formed with the end of the shaft where it connects with the shaft or is formed with a step.

[0013] Preferably, the front section of the drill bit body of the hole-opening device is a twist drill bit.

[0014] Preferably, the twist drill comprises cutting edges and chip grooves, and the angle between adjacent cutting edges is 30-120°; the number of the cutting edges or chip grooves is 1-4.

[0015] Preferably, the number of the cone-shaped points is 1 to 5.

[0016] Preferably, the middle section is an olive-shaped waist design.

[0017] Preferably, the twist drill has a diameter of 1.0 to 2.5 mm.

[0018] Preferably, the handle is a straight handle, a gun handle or a disc handle.

[0019] Preferably, the transverse cross-section of the guide sleeve is circular, elliptical or square.

[0020] The utility model utilizes the cooperation between the guiding device and the hole-opening device structure to facilitate chip removal, avoid the problem of residual bone chips in the perforation, and avoid the formation of "bone wall" of the bone hole. Furthermore, by changing the conical hole formed by the existing microfracture conical tip into a cylindrical shape, the drilling is deeper and the effective ingredient seepage effect is better; the utility model can also form multiple microfracture holes in one step, and the hole spacing is accurately controllable, which can avoid the traditional single drill bit drilling multiple times, the long operation time and inaccurate bone hole position caused by manual selection of bone hole drilling points, bone hole directions, and adjustment directions; after completing multiple bone hole operations using this kit, all bone hole directions and hole wall thicknesses are accurately controllable, effectively preventing the risk of iatrogenic fractures during microfracture surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a cross-sectional view of the microfracture instrument kit of the utility model.

[0023] Figure 2A It is a structural diagram of the hole-opening device of the utility model (excluding the serpentine bending connection part).

[0024] Figure 2B It is a structural diagram of the hole-opening device (including the serpentine bending connection part) of the utility model.

[0025] Figure 3 It is a structural diagram of the drill body of the utility model.

[0026] Figure 4A to Figure 4C A schematic diagram of the formation between the drill body and the shaft of the utility model.

[0027] Figure 5A to Figure 5C A schematic diagram of the connection between the drill body and the shaft of the utility model.

[0028] Figure 6 It is a front view of the front section of the drill body of the utility model.

[0029] Figure 7 It is a structural schematic diagram of a drill body with different cutting edges of the utility model.

[0030] Figure 8A to Figure 8C The utility model has a structural diagram of a guide device with different handles.

[0031] FIG. 9A to FIG. 9D yes Figure 8BSchematic diagram of various cross-sectional appearances at AA in the middle.

[0032] Figure 10A to Figure 10B It is a schematic diagram of different formation methods of the guide device of the utility model.

[0033] Fig.11 It is a structural diagram of a guide device with a cone point of the utility model.

[0034] Figures 12A to 12E It is a schematic diagram of the operation process of the utility model. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Referring to the drawings in the specification, a microfracture instrument kit includes a hole-opening device 1 and a guiding device 2 matched therewith. The hole-opening device 1 can be formed in one piece or in sections. The hole-opening device 1 can be inserted into the guiding device 2. The guiding device 2 can guide the hole-opening device 1 so as to perform reliable drilling in clinical practice.

[0037] The drilling device 1 includes a drill body 11 and a rod 12. The transition connection between the drill body 11 and the rod 12 can be an integral molding method or a welding method to connect the two together. Figure 4A As shown, the drill body 11 is inserted into the shaft 12 and the two are connected together by welding, or as shown in the attached Figure 4B As shown, the drill body 11 and the shaft 12 are formed in an integral manner, or as shown in the attached Figure 4C As shown, the drill body 11 and the shaft 12 are formed by multi-layer insertion welding. In addition, the transition connection between the drill body 1 and the shaft 12 can be designed with the same diameter, refer to the attached Figure 5A As shown, the diameters of the drill body 11 and the rod 12 at the connecting end are the same. Of course, the transition connection between the drill body 11 and the rod 12 can also be a step design, that is, refer to the attached Figure 5B and 5C The diameters of the drill body 11 and the rod 12 at the connecting ends are different, so that a step 10 is formed at the connecting ends of the two. As another embodiment, as shown in the attached Figure 5B, the radial width of the rear end of the drill body 11 is greater than the radial width of the end of the shaft, it is necessary to set a design to limit the maximum depth of the drilling at the end of the shaft away from the drill body; as another embodiment, as shown in the attached Figure 5C The design that the width of the rear end portion of the drill body 11 is smaller than the end portion of the shaft can effectively limit the maximum depth of the drilling.

[0038] See attached Figure 3 The drill body 11 can be roughly divided into a front section 1a, a middle section 1b and a rear section 1c. The length L1 of the head of the hole-opening device 1 passing through the head of the guide device 2 is in the range of 3 to 15 mm. The front section 1a has a twist drill 111. The diameter d1 of the twist drill 111 is in the range of 1.0 to 2.5 mm. Figure 6 The twist drill 111 includes a cutting blade 11a and a chip groove 11b. The angle θ between adjacent cutting blades 11a can be set to 30-120°. The number of the cutting blades and the chip grooves can be set to 1-4 respectively. The twist blade drill design of the present invention can facilitate the discharge of bone chips during the drilling process, and avoid the compression of trabeculae to form a closed "bone wall" that affects the exudation of active bone marrow substances. Compared with the front section 1a and the rear section 1c, the middle section 1b of the drill body presents a state of contraction from both ends to the middle. The middle section 1b can present an inward arc transition waist design. The middle section 1b can be an "olive head" waist design. This structural design is very conducive to chip removal and avoids the formation of a "bone wall". The rear section 1c of the drill body can be combined with a flexible and bendable shaft, so that the hole-opening device can flexibly enter and exit the curved space of the guide device.

[0039] See attached Figure 2A The shaft 12 is connected to the drill body 11. In another embodiment, referring to the attached Figure 2B The shaft 12 includes a serpentine curved connection part 121, the length L2 of the serpentine curved connection part 121 is 5 to 50 mm, the serpentine curved connection part 121 is connected to the drill body 11, one end of the shaft 12 is connected to the rear section 1c of the drill body, and the other end of the shaft is connected to a handle, the handle has an electric drive part, and the electric drive part is connected to an external power supply. Under the drive of the power supply, the drill body can move axially relative to the guide device. The electric drive part can be a motor. The serpentine on the serpentine curved connection part can be formed by laser cutting, and the serpentine design of the shaft can help the hole opening device turn in the curved pipe; the shaft 12 can be set as a single-layer or multi-layer structure, and the shaft can be adapted to the guide sleeve of the guide device, so that the effective bone drilling depth of the entire kit is between 3 and 15 mm.

[0040] The guide device 2 includes a guide sleeve 22, which can be arranged in a straight tube shape or can be arranged to be bent at a certain angle; the microfracture instrument kit also includes a handle 21, which is connected to one end of the shaft 12, and the handle 21 can be as shown in the attached Fig. 8A The straight handle shown, as shown in the attached Figure 8B The handle shown, or Figure 8C The length L3 of the guide sleeve 22 is 70-220 mm. The guide sleeve 22 includes a straight section b1 and a curved guide section b2. The curved guide section b2 is curved relative to the straight section b1. The curvature β of the curved guide section b2 relative to the straight section b1 is 0-90°. The transverse cross section s of the guide sleeve 22 can present different shapes, such as Figures 9A to 9D The circular, elliptical or square shape shown in the figure; the transverse cross section s is provided with a channel s1, and the channel s1 can be a plurality of channels s1 arranged in parallel, the number of the channels is, for example, 3 to 20 holes, the aperture d2 of each channel is 1.2 to 2.7 mm, and the spacing between the hole walls L4 of adjacent channels s1 is 2 to 4 mm, wherein at the bone contact end of the guide device, the shortest distance between the edge of the hole closest to the boundary of the guide device and the boundary of the guide device is 0.5 to 3 mm. Further, in one embodiment, referring to the attached Fig. 10A The guide sleeve 22 can be formed by an integral molding method to form an integral bending guide sleeve having a plurality of channels; in another embodiment, the guide sleeve 22 can also be formed by welding, see the attached Fig. 10B The guide sleeve 22 is formed by welding a large tube into a small tube and performing welding at the end surface to form the porous guide sleeve of the present invention.

[0041] In another preferred embodiment, referring to the attached Fig.11 The bone contact end of the guide device 2 forms a conical point 2a, and the number of the conical points 2a ranges from 1 to 5. In this way, the conical point design at the bone contact end can effectively stabilize the guide device and avoid the problem of sliding instability during the doctor's operation. Fig. 12A To Attachment Fig.12EThe operation mode of the microfracture instrument kit of the utility model is as follows: first, select a guide device 2 with a suitable angle and place it on the cartilage surface; then, select a suitable hole-opening device 1, install it on the hand drill, and drill it in sequence through the channel in the guide device 2; finally, when all the hole-opening devices 1 are drilled to the depth limit position, the hole-opening devices are taken out in sequence. In the whole process, the actions required by the doctor are to guide, drill in, and drill out, and form multiple microfracture holes in one step. After the improvement of the microfracture instrument kit of the utility model, the clinical effect is more obvious, the work efficiency is greatly improved, and the use is safer, more accurate and controllable; it changes the conical hole formed by the existing microfracture conical tip into a cylindrical shape, the drilling is deeper, the effective ingredient seepage effect is better, and the formation of a "bone wall" of the bone hole is avoided; through the multi-porous parallel design of the guide device, the direction is controllable to avoid iatrogenic fractures; the limit design of the hole-opening device uses the guide sleeve for one-time positioning, which is convenient for drilling and reduces the operation time. After using the kit of the present invention, during the entire surgical process, the doctor only needs to determine the position and direction of the guide device, drive the hole-opening device, and use the guide device to complete the microfracture drilling in one go. The drilling during the entire surgical process is accurate, controllable, efficient and safe.

[0042] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A microfracture instrument kit, characterized in that: It includes a hole-opening device and a guiding device matched therewith, the hole-opening device includes a drill body and a rod body, the drill body includes a front section, a middle section and a rear section, the front section is provided with a cutting edge, the rear section is connected to the rod body, and the middle section is in a waisted shape that is rounded from both ends to the middle.

2. A microfracture instrument kit according to claim 1, characterized in that: The guide device comprises a guide sleeve, a hole is formed in the guide sleeve, and the shaft of the hole-opening device is inserted into the hole of the guide device; a cone point is formed at the bone contact end of the guide device.

3. A microfracture instrument kit according to claim 2, characterized in that: The guide device is in the shape of a straight cylinder.

4. A microfracture instrument kit according to claim 2, characterized in that: The holes are multiple and are arranged parallel to each other.

5. A microfracture instrument kit according to claim 2, characterized in that: The number of the holes is 3 to 20, the diameter of each hole is 1.2 to 2.7 mm, and the spacing between the hole walls of adjacent holes is 2 to 4 mm; at the bone contact end of the guide device, the shortest distance between the edge of the hole closest to the boundary of the guide device and the boundary of the guide device is 0.5 to 3 mm.

6. A microfracture instrument kit according to claim 2, characterized in that: The guide sleeve comprises a straight section and a curved guide section. The curved guide section is curved relative to the straight section, and the curvature of the curved guide section relative to the straight section is 0-90°.

7. A microfracture instrument kit according to claim 1, characterized in that: The shaft includes a serpentine curved connection portion, and the microfracture instrument kit also includes a handle. One end of the shaft is connected to the rear section of the drill body, and the other end of the shaft is connected to the handle. The handle includes an electric drive part. When driven by the electric drive part, the drill body can move axially relative to the channel in the guide device.

8. A microfracture instrument kit according to claim 7, characterized in that: The length of the head of the hole-opening device passing through the head of the guide device is in the range of 3 to 15 mm, and the length of the serpentine curved connection portion is in the range of 5 to 50 mm.

9. A microfracture instrument kit according to claim 1, characterized in that: The rear section of the drill body and the connecting end of the rod body are integrally formed or formed with a step.

10. A microfracture instrument kit according to claim 1, characterized in that: The front section of the drill body of the hole-opening device is a twist drill; the twist drill comprises cutting edges and chip grooves, and the angle between adjacent cutting edges is 30 to 120 degrees; the number of the cutting edges or chip grooves is 1 to 4.

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