A microfracture device

Abstract

The present application relates to a kind of microfracture apparatus, including inserter, multiple inner rod assemblies, lifting block, knock bar and handle;Inserter includes multiple insertion holes, each inner rod assembly includes guide rod and guide needle, guide needle is arranged at the end of guide rod, the height of the guide rod of each guide rod assembly is different;Lifting block is located at one end of inserter, lifting block includes multiple different depth step grooves, step groove is used to cooperate with guide rod, guide needle is passed through step groove and cooperates with insertion hole;Knock bar is applied with the force of first direction, knock bar knocks one of multiple inner rod assemblies;Handle is threadedly matched with knock bar and lifting block respectively, handle is applied with the first rotating force, handle drives lifting block and knock bar to move to second direction, second direction is opposite to first direction, handle is rotated to target position, guide needle is taken out.This application can form multiple microfracture holes at a time, improve the controllability of hole spacing, can be orderly pulled out instrument, reduce the risk of iatrogenic fracture block with instrument pulling out.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a microfracture device. Background Technology

[0002] With the promotion of national fitness and the increase in obesity and overweight individuals, more and more articular cartilage is being damaged, degenerated, and defective. Because cartilage damage is difficult to repair itself, severe trauma or certain surgeries leading to bone and cartilage damage require the use of auxiliary tools to create microfractures by perforating the exposed subchondral bone. Multipotent mesenchymal stem cells from the human bone marrow can then seep out from the injury site, potentially generating replacement tissue composed of fibrous tissue, fibrocartilage, or hyaline cartilage to repair the damage. Microfracture surgery is mainly suitable for treating full-thickness cartilage defects in the weight-bearing areas of the femoral condyle and tibial plateau, or full-thickness cartilage defects in the articular surfaces of the patella, femoral trochlea, and talus. Current microfracture techniques use a single cone-shaped tool, requiring doctors to visually assess the bone hole spacing and drill holes one by one. This operation is imprecise, the spacing between microfracture holes is poorly controllable, and it is impossible to ensure that each bone hole is oriented consistently, easily causing iatrogenic fracture fragments to be pulled out with the instrument, posing a high risk. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the spacing and direction between microfracture holes are not controllable in the prior art, and the risk of iatrogenic fracture fragments being pulled out with instruments is relatively high. At the same time, the invention simplifies the operation and shortens the operation time.

[0004] To address the aforementioned technical problems, this invention discloses a microfracture device, comprising:

[0005] An inserter, the inserter including a plurality of insertion holes;

[0006] Multiple inner rod assemblies, each inner rod assembly including a guide rod and a guide pin, the guide pin being disposed at the end of the guide rod, and the height of the guide rod in each guide rod assembly being different;

[0007] A lifting block is located at one end of the inserter. The lifting block includes multiple stepped grooves of different depths. The stepped grooves are used to cooperate with the guide rod. The guide pin passes through the stepped grooves and then cooperates with the insertion hole.

[0008] A striking rod, configured such that when a force is applied to the striking rod in a first direction, the striking rod strikes one of the plurality of inner rod assemblies;

[0009] A rotating handle is threadedly engaged with the striking rod and the lifting block, respectively. The rotating handle is configured such that when a first rotational force is applied to the rotating handle, the rotating handle drives the lifting block and the striking rod to move in a second direction, which is opposite to the first direction. When the rotating handle reaches the target position, the guide pin is removed.

[0010] In one feasible embodiment, each inner rod assembly includes a guide rod and a plurality of guide pins.

[0011] Furthermore, the plurality of stepped grooves are spirally arranged along the circumference of the lifting block, and the depth of the plurality of stepped grooves increases sequentially along the spiral direction.

[0012] Furthermore, the depth difference between two adjacent step grooves is a first depth threshold.

[0013] Furthermore, when the striking rod is subjected to a force in a first direction, the guide pin of the inner rod assembly being struck extends out of the end face of the inserter by a first distance threshold.

[0014] In one feasible embodiment, the first distance threshold is greater than the first depth threshold, and the first distance threshold is less than twice the first depth threshold.

[0015] Furthermore, the end of the inserter away from the lifting block is bent at a first angle.

[0016] Furthermore, the handle includes a first screw joint and a second screw joint that are connected to each other. The first screw joint is threadedly engaged with the lifting block, and the second screw joint is threadedly engaged with the striking rod.

[0017] Furthermore, the microfracture device also includes a housing handle and a nut. The housing handle covers the outside of the first screw joint, and the nut covers the outside of the second screw joint. The housing handle is spaced apart from the first screw joint, and the nut is connected to the second screw joint, so that the handle rotates synchronously when the nut is rotated.

[0018] The microfracture device of this application includes an inserter, multiple inner rod assemblies, a lifting block, a striking rod, and a handle. The inserter includes multiple insertion holes. Each inner rod assembly includes a guide rod and a guide needle, the guide needle being disposed at the end of the guide rod, and the height of the guide rod in each guide rod assembly is different. The lifting block is located at one end of the inserter and includes multiple stepped grooves of different depths. The stepped grooves are used to cooperate with the guide rods, and the guide needles penetrate the stepped grooves and cooperate with the insertion holes. The striking rod is configured such that when a force is applied to the striking rod in a first direction, the striking rod strikes one of the multiple inner rod assemblies. The handle is threadedly engaged with the striking rod and the lifting block, respectively. The handle is configured such that when a first rotational force is applied to the handle, the handle drives the lifting block and the striking rod to move in a second direction, the second direction being opposite to the first direction. This application can form multiple microfracture holes in one step, improving the controllability of hole spacing and bone hole direction, allowing for orderly removal of the device, and reducing the risk of iatrogenic fracture fragments being removed with the device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0020] Figure 1 This is an exploded view of the microfracture device according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the microfracture device according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the inserter according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the inner rod assembly according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the lifting block according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the striking rod according to an embodiment of the present invention;

[0026] In the figure, 1-insertion device, 11-insertion hole, 2-inner rod assembly, 21-guide rod, 22-guide pin, 3-lifting block, 31-step groove, 32-third thread, 4-tapping rod, 41-fourth thread, 5-handle, 51-first screw joint, 52-second screw joint, 6-first distance threshold, 7-outer shell handle, 8-nut. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0028] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. In the description of the invention, it should be understood that the terms "upper," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0029] Specifically, to solve the above-mentioned technical problems, this invention discloses a microfracture device, specifically, as follows: Figures 1 to 3 As shown, the microfracture device includes an inserter 1, multiple inner rod assemblies 2, a lifting block 3, a striking rod 4, and a handle 5. The inserter 1 includes multiple insertion holes 11; each inner rod assembly 2 includes a guide rod 21 and a guide needle 22, the guide needle 22 being disposed at the end of the guide rod 21 and inserted into the insertion hole 11. Under external force, the guide needle 22 moves axially along the insertion hole 11 to insert into or remove from the bone fragment, thus achieving the assisted microfracture treatment of the affected area. In one example, see [further details omitted]. Figure 1 and Figure 3The inserter 1 has a cylindrical structure. Preferably, the total length of the inserter 1 is 110mm to 115mm, the diameter of the cross-sectional circle of the inserter 1 is 10mm to 12mm, the diameter of the insertion hole 11 is 1mm to 1.2mm, the distance between two adjacent insertion holes 11 is 2mm to 4mm, and the diameter of the guide needle 22 is 0.9mm to 1.1mm. This can avoid the distance between the guide needles 22 being too small, which would result in the distance between the microfracture holes being too small, which could easily cause the microfractures to become continuous and form small bone defects, causing clinical medical risks.

[0030] In one example, such as Figure 4 As shown, each inner rod assembly 2 may include a guide rod 21 and a guide needle 22, or it may include a guide rod 21 and multiple guide needles 22. This forms a microfracture device with multiple guide needles 22. It is understood that existing microfracture devices are all single-hole forming devices. Clinically, when using microfracture devices to assist in microfracture formation, multiple microfracture holes need to be formed at the affected area, requiring multiple tapping and repeated withdrawals and direction changes. This is time-consuming, laborious, inaccurate, and difficult to control, requiring highly skilled experience. Furthermore, because clinical practice has certain requirements for the spacing between the formed holes, multiple single-hole punctures test the doctor's skill and are prone to errors. In this application, the microfracture device is constructed as a microfracture device with multiple guide needles 22. After performing one microfracture-assisted microfracture with the microfracture device, multiple guide needle holes 22 are formed at the affected area, avoiding multiple withdrawals of the microfracture device and reducing the dependence of microfracture formation on the doctor's skill level.

[0031] Furthermore, such as Figure 4 and 5 As shown, the height of each guide rod 21 assembly is different. The lifting block 3 is located at one end of the inserter 1. The lifting block 3 includes multiple stepped grooves 31 of different depths, which are used to engage with the guide rods 21. The guide needle 22 passes through the stepped grooves 31 and engages with the insertion hole 11. The striking rod 4 is configured such that when a force is applied in a first direction, the striking rod 4 strikes one of the multiple inner rod assemblies 21, and the striking depth of the struck guide rod 21 is limited by the bottom of the corresponding stepped groove 31 to prevent the guide needle 22 from penetrating too deeply into the affected area.

[0032] In one example, multiple stepped grooves 31 are spirally arranged circumferentially along the lifting block 3, and the depth of the multiple stepped grooves 31 increases sequentially along the spiral direction. In another example, the guide rod 21 corresponding to the deeper stepped groove 31 is higher. The heights of the multiple guide rods 21 form a stepped structure, and preferably, the height difference between two adjacent guide rods 21 is the same.

[0033] For further information, please refer to [link / reference]. Figure 2The handle 5 is threadedly engaged with the striking rod 4 and the lifting block 3, respectively. The handle 5 includes a first thread and a second thread, the lifting block 3 includes a third thread 32, and the striking rod 4 includes... Figure 6 The fourth thread 41 shown engages with the first thread and the third thread 32, and with the second thread and the fourth thread 41. For example, the height difference between the guide rods 21 is adapted to the rotation stroke of the fourth thread 41 so that after striking the first guide rod 21, the fourth thread 41 completes the target rotation stroke, allowing the striking rod 4 to accurately contact the next guide rod 21, preparing for the next strike. In one example, the fourth thread 41 can rotate 72° before moving from the struck guide rod 21 to the next, and so on, until all guide rods 21 have been struck, achieving complete insertion of the guide pins 22 of all inner rod assemblies 2.

[0034] Furthermore, when the entire tapping process is complete and the microfracture instrument needs to be removed, a first rotational force can be applied to the handle 5, causing the handle 5 to drive the lifting block 3 and the tapping rod 4 to move in a second direction, opposite to the first direction. The first direction can be the insertion direction of the guide needle 22 after the tapping rod 4 is tapped, and the second direction is the opposite of the first direction, i.e., the removal direction of the guide needle 22. Specifically, when the handle 5 rotates to the target position, the guide needle 22 is removed. The target position can be the lowest position where the handle 5 cannot rotate further, or it can be a pre-set position, such as reaching the target position after several rotations. The specific setting can be determined according to the actual situation.

[0035] It is understandable that when the microfracture instrument is removed, the depth difference between the step grooves 31 allows the corresponding guide rods 21 to be removed sequentially, reducing the group effect caused by the guide rods 21 being removed all at once, and reducing the risk of iatrogenic fracture fragments being removed with the instrument.

[0036] In one example, the depth difference between two adjacent stepped grooves 31 is a first depth threshold. When the striking rod 4 is subjected to a force in a first direction, the guide pin 22 of the inner rod assembly 2 being struck extends out of the end face of the inserter 1 at a first distance threshold 6. The first distance threshold 6 is greater than the first depth threshold and less than twice the first depth threshold. It is understood that by setting the first distance threshold 6 to be greater than the first depth threshold and less than twice the first depth threshold, during the removal of the microfracture device, the lifting block 3 can simultaneously lift two sets of inner rod assemblies 2, reducing the rotation stroke of the lifting block 3. However, at this time, all three sets cannot be removed at the same time, because when the lifting block 3 contacts the guide pin 21 of the third set of inner rod assemblies 2, the first depth threshold has already increased by twice, and the guide pin 22 has already detached from the bone at the affected area. Thus, this design can both reduce the rotation stroke of the lifting block 3 and avoid the group effect formed by one-time removal, reducing the risk of iatrogenic fracture fragments being removed with the device.

[0037] For example, the first depth threshold can be 50mm to 70mm, and the first distance threshold 6 can be 90mm to 130mm. In this embodiment, the first depth threshold is preferably 50mm, and the first distance threshold 6 is preferably 90mm.

[0038] Furthermore, the end of the inserter 1 furthest from the lifting block 3 is bent at a first angle. For example, this first angle can be 8° to 12°, and preferably, in this embodiment, it can be 10°. By setting the first angle, it can be ensured that the striking angle is perpendicular to the bone surface during the procedure.

[0039] For further information, please refer to [link / reference]. Figure 1 and Figure 2 As shown, the handle 5 includes a first screw joint 51 and a second screw joint 52 connected to each other. A first thread is provided on the first screw joint 51 to cooperate with the third thread 32 of the lifting block 3, and a second thread is provided on the second screw joint 52 to cooperate with the fourth thread 41 of the striking rod 4.

[0040] Furthermore, the microfracture device also includes a housing handle 7 and a nut 8. The housing handle 7 covers the outside of the first screw joint 51, and the nut 8 covers the outside of the second screw joint 52. The housing handle 7 is spaced apart from the first screw joint 51, and the nut 8 is connected to the second screw joint 52 so that when the nut 8 is rotated, the handle 5 is rotated synchronously.

[0041] The microfracture device of this application includes an inserter 1, multiple inner rod assemblies 2, a lifting block 3, a striking rod 4, and a handle 5. The inserter 1 includes multiple insertion holes 11. Each inner rod assembly 2 includes a guide rod 21 and a guide needle 22. The guide needle 22 is disposed at the end of the guide rod 21, and the height of the guide rod 21 of each guide rod assembly is different. The lifting block 3 is located at one end of the inserter 1. The lifting block 3 includes multiple stepped grooves 31 of different depths. The stepped grooves 31 are used to cooperate with the guide rod 21. The guide needle 22 passes through the stepped grooves 31 and cooperates with the insertion hole 11. The striking rod 4 is configured such that when a force is applied to the striking rod 4 in a first direction, the striking rod 4 strikes one of the multiple inner rod assemblies 2. The handle 5 is threadedly engaged with the striking rod 4 and the lifting block 3, respectively. The handle 5 is configured such that when a first rotational force is applied to the handle 5, the handle 5 drives the lifting block 3 and the striking rod 4 to move in a second direction, which is opposite to the first direction. This application can form multiple microfracture holes in one step, improving the controllability of hole spacing, allowing for orderly removal of instruments, and reducing the risk of iatrogenic fracture fragments being removed with the instruments.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A microfracture device, characterized in that, include: Insertor (1), the inserter (1) includes a plurality of insertion holes (11); Multiple inner rod assemblies (2), each inner rod assembly (2) including a guide rod (21) and a guide pin (22), the guide pin (22) being disposed at the end of the guide rod (21), and the height of the guide rod (21) of each guide rod assembly being different. Lifting block (3), the lifting block (3) is located at one end of the inserter (1), the lifting block (3) includes a plurality of stepped grooves (31) of different depths, the stepped grooves (31) are used to cooperate with the guide rod (21), and the guide pin (22) passes through the stepped grooves (31) and cooperates with the insertion hole (11); A striking rod (4) is configured such that when a force is applied to the striking rod (4) in a first direction, the striking rod (4) strikes one of the plurality of inner rod assemblies (2), the striking rod (4) includes a fourth thread (41), the height difference between the guide rods (21) is adapted to the stroke of the fourth thread (41) such that after striking the first guide rod (21), the fourth thread (41) just completes the target stroke, and the striking rod (4) can contact the next guide rod (21); The handle (5) is threadedly engaged with the striking rod (4) and the lifting block (3). The handle (5) is configured such that when a first rotational force is applied to the handle (5), the handle (5) drives the lifting block (3) and the striking rod (4) to move, thereby driving the guide needle (22) to move in a second direction opposite to the first direction, so that when the handle (5) rotates to the target position, the guide needle (22) is taken out.

2. The microfracture device according to claim 1, characterized in that, Each inner rod assembly (2) includes a guide rod (21) and a plurality of guide pins (22).

3. The microfracture device according to claim 1, characterized in that, The plurality of stepped grooves (31) are spirally arranged along the circumferential direction of the lifting block (3), and the depth of the plurality of stepped grooves (31) increases sequentially along the spiral direction.

4. The microfracture device according to claim 3, characterized in that, The depth difference between two adjacent step grooves (31) is the first depth threshold.

5. The microfracture device according to claim 4, characterized in that, When the striking rod (4) is subjected to a force in a first direction, the guide pin (22) of the inner rod assembly (2) being struck extends out of the end face of the inserter (1) at a first distance threshold (6).

6. The microfracture device according to claim 5, characterized in that, The first distance threshold (6) is greater than the first depth threshold, and the first distance threshold (6) is less than twice the first depth threshold.

7. The microfracture device according to claim 1, characterized in that, The inserter (1) is bent at a first angle at the end away from the lifting block (3).

8. The microfracture device according to claim 1, characterized in that, The handle (5) includes a first screw joint (51) and a second screw joint (52) connected to each other. The first screw joint (51) is threadedly engaged with the lifting block (3), and the second screw joint (52) is threadedly engaged with the striking rod (4).

9. The microfracture device according to claim 8, characterized in that, The microfracture device also includes a housing handle (7) and a nut (8). The housing handle (7) covers the outside of the first screw joint (51), and the nut (8) covers the outside of the second screw joint (52). The housing handle (7) is spaced apart from the first screw joint (51), and the nut (8) is connected to the second screw joint (52) so that when the nut (8) is rotated, the handle (5) is rotated synchronously.

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