Cartilage defect modeling instrument

Abstract

The utility model discloses a cartilage defect modeling instrument, and relates to the technical field of medical instruments. The cartilage defect modeling instrument comprises a trephine, the bottom of which is provided with sawteeth for drilling into cartilage to take the cartilage; the bone taking device comprises an ejector rod arranged in the trephine and used for ejecting taken cartilage, and further comprises a sliding sleeve which penetrates through the trephine and is arranged outside the trephine in a sleeving mode, the sliding sleeve is used for pushing the ejector rod to axially slide for ejection operation, and the ejector rod is in threaded connection with the inner side of the sliding sleeve and used for adjusting the overall length of the bone taking device. The drilling end of the trephine is sleeved with the positioner, the height of the positioner on the trephine can be adjusted, the bone taking device is arranged in the trephine, cartilage columns remaining in a pipeline body during molding can be rapidly ejected out in a pushing mode, the molding efficiency of cartilage defects and the use convenience of the device are improved, the positioner is arranged outside, and the bone taking device is convenient to use. And the depth of the cartilage defect can be accurately controlled by matching with the scale marks, so that the requirements of different cartilage defect depths of different species of animals are met.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a cartilage defect modeling instrument. Background Art

[0002] The repair of cartilage injury is an important research content in the field of sports medicine. The motor ability and daily life of patients with cartilage injury will be affected to varying degrees. Existing treatment programs cannot generate normal hyaline cartilage at the defect site. Therefore, how to better achieve the repair of cartilage injury has become a hot topic in the field of sports medicine.

[0003] Animal models are necessary procedures before various treatment programs and surgical methods enter the clinic. They can simulate diseases in clinics, compare the differences in the effects of various treatment programs, and evaluate the safety of drugs / materials in vivo. Before a new treatment program for cartilage injury enters the clinic, it is necessary to verify the effect and biological safety in animals.

[0004] For the preparation of existing cartilage defect models, tools such as trephines and electric drills are often used to drill holes in the articular surface of the trochlear groove of the femur. Although there are scales in the front of these devices to measure the depth, there is a lack of a limiting device, making it difficult to precisely control the depth of the defect, which has a great impact on the rigor of the experiment. In addition, after modeling with a trephine, due to the hollow design in the front, the removed cartilage plug is stuck in the pipeline and is not easy to take out, affecting the modeling efficiency of the cartilage defect model. Content of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the utility model provides a cartilage defect modeling instrument, which solves the problems existing in the preparation of cartilage defect models by using trephines.

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions: A cartilage defect modeling instrument, comprising:

[0007] A trephine, with sawteeth arranged at the bottom for drilling into cartilage to obtain cartilage;

[0008] An osteotome, including a ejector rod arranged inside the trephine for ejecting the obtained cartilage, and further including a sliding sleeve penetrating through the trephine and sleeved outside the trephine for pushing the ejector rod to slide axially for ejection operation. The ejector rod is threadedly connected to the inner side of the sliding sleeve for adjusting the overall length of the osteotome;

[0009] A locator, sleeved outside the drilling end of the trephine. The locator can be adjusted in height on the trephine, and a damping structure for increasing the friction of the locator is arranged on the side of the trephine. Scale lines are arranged on the side of the trephine and between the damping structures.

[0010] Preferably, a screw sleeve adapted to the ejector rod is provided inside the sliding sleeve, notches adapted to both sides of the screw sleeve are formed on both sides of the top end of the trephine, and a screwdriver slot is formed at the top end of the ejector rod.

[0011] Preferably, a positioning ring is provided on the outer side of the trephine and below the notch, and an elastic member is sleeved between the positioning ring and the sliding sleeve on the outer part of the trephine.

[0012] Preferably, the positioner includes:

[0013] A fixed tube, sleeved outside the trephine and fixed by screws on both sides, and a convex ring is provided on the outer side of the fixed tube;

[0014] A rotating sleeve, consisting of a disk at the bottom and a circular tube provided at the center of the top, the circular tube is sleeved outside the fixed tube and axially positioned by the convex ring.

[0015] Preferably, the damping structure is anti-slip strips embedded and pasted on both sides of the trephine, and the positioner is fixed in position by tightening the screws to press on the surface of the anti-slip strips.

[0016] Preferably, a drill bit connecting member is further provided at the top of the trephine for connecting the trephine to an electric drill.

[0017] Preferably, the drill bit connecting member is composed of a prism section, a threaded section and a plugging section from top to bottom, the middle of the plugging section is an insertion tube inserted into the trephine, and convex ribs inserted into the notches are provided at both ends of the insertion tube.

[0018] Preferably, threads are formed on the outer part of the top end of the trephine, the threaded section of the drill bit connecting member and the outer threads of the trephine are commonly threadedly connected with a threaded locking tube, and the tightening rotation direction of the threaded locking tube is consistent with the rotation direction when the trephine works.

[0019] The utility model provides a cartilage defect modeling instrument. Compared with the prior art, the following beneficial effects are achieved:

[0020] 1. For this cartilage defect modeling instrument, by arranging a bone extractor inside the trephine, the cartilage column remaining in the pipeline main body during modeling can be quickly ejected by pushing, improving the modeling efficiency of cartilage defect and the convenience of using the device. The length of the bone extractor itself can be adjusted to further adapt to the ejection of cartilage columns with different depths. By arranging a positioner outside and cooperating with scale lines, the depth of cartilage defect can be accurately controlled, facilitating the adaptation to the different requirements of cartilage defect depths of different species of animals.

[0021] 2. For this cartilage defect modeling instrument, the positioner can slide outside the trephine to adjust the height and can be fixed by tightening the screw, thereby enabling control of the drilling depth of the trephine. The positioner mainly consists of two parts, a fixed tube and a rotating sleeve that rotate relative to each other. After the height of the fixed tube is fixed, the rotating sleeve is pressed against the bone surface, and the rotating sleeve can remain stationary during the rotation of the trephine, thus not causing wear to the bone surface, and it is safe and convenient to use.

[0022] 3. For this cartilage defect modeling instrument, by setting the drill bit connector, through the operations of first inserting and then tightening, it can be stably connected to the trephine and is convenient for installation with an electric drill, and the assembly and disassembly are simple and convenient. Brief Description of the Drawings

[0023] Figure 1 is the assembly drawing of the present utility model;

[0024] Figure 2 is the exploded view of the present utility model;

[0025] Figure 3 is the partial cross-sectional view of the bone extractor of the present utility model;

[0026] Figure 4 is the partial cross-sectional view of the positioner of the present utility model;

[0027] Figure 5 is the schematic diagram of the drill bit connector and the threaded locking tube of the present utility model.

[0028] In the figure: 1 - trephine, 11 - notch, 12 - positioning ring, 13 - anti-slip strip;

[0029] 2 - bone extractor, 21 - ejector rod, 22 - sliding sleeve;

[0030] 3 - positioner, 31 - fixed tube, 32 - screw, 33 - convex ring, 34 - rotating sleeve;

[0031] 4 - elastic member;

[0032] 5 - drill bit connector, 51 - prism section, 52 - threaded section, 53 - insertion section;

[0033] 6 - threaded locking tube. Detailed Embodiment

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] The present utility model provides three technical solutions:

[0036] Figures 1 - 3 The first embodiment is shown: A cartilage defect modeling instrument, comprising:

[0037] A trephine 1, with serrations provided at the bottom for drilling into cartilage to obtain cartilage. The outer diameter of the top end of the trephine 1 is 8 mm, the inner diameter is 6 mm, the outer diameter of the bottom end of the trephine 1 is 6 mm, and the inner diameter is 4 mm;

[0038] An osteotome 2, including a top rod 21 disposed inside the trephine 1 for ejecting the obtained cartilage, and further including a sliding sleeve 22 penetrating through the trephine 1 and sleeved outside the trephine 1 for pushing the top rod 21 to axially slide for the ejection operation. The top rod 21 is threadedly connected to the inner side of the sliding sleeve 22 for adjusting the overall length of the osteotome 2;

[0039] A locator 3, sleeved outside the drilling end of the trephine 1. The locator 3 is adjustable in height on the trephine 1, and a damping structure for increasing the friction of the locator 3 is provided on the side of the trephine 1. Scale lines are provided between the damping structures on the side of the trephine 1.

[0040] A screw sleeve adapted to the top rod 21 is provided inside the sliding sleeve 22. Notches 11 adapted to both sides of the screw sleeve are provided on both sides of the top end of the trephine 1. A screwdriver slot is provided at the top end of the top rod 21. A positioning ring 12 is provided outside the trephine 1 and below the notches 11. An elastic member 4 is sleeved between the positioning ring 12 and the sliding sleeve 22 outside the trephine 1. The elastic member 4 is a spring.

[0041] By providing the osteotome 2 inside the trephine 1, the cartilage column remaining in the pipe body during modeling can be quickly ejected by pushing, improving the modeling efficiency of cartilage defects and the convenience of using the device. The osteotome 2 itself can also adjust its length, further adapting to the ejection of cartilage columns at different depths. By providing the locator 3 outside and cooperating with the scale lines, the depth of cartilage defects can be accurately controlled, facilitating the adaptation to the different requirements of cartilage defect depths of different species of animals.

[0042] Figures 1 - 2 and Figure 4 The second embodiment is shown. The main difference from the first embodiment is that the locator 3 includes:

[0043] A fixed pipe 31, sleeved outside the trephine 1 and fixed by screws 32 on both sides. A convex ring 33 is provided on the outer side of the fixed pipe 31;

[0044] A rotating sleeve 34, consisting of a disc at the bottom and a circular pipe provided at the center of the top. The circular pipe is sleeved outside the fixed pipe 31 and axially positioned by the convex ring 33.

[0045] The damping structure is anti-slip strips 13 embedded and pasted on both sides of the trephine 1. The locator 3 is fixed in position by tightening the screw 32 against the surface of the anti-slip strip 13.

[0046] The locator 3 can slide outside the trephine 1 to adjust the height and can be fixed by tightening the screw 32, thereby enabling control of the drilling depth of the trephine 1. The locator 3 mainly consists of two parts, a fixed tube 31 and a rotating sleeve 34 that rotate relative to each other. After the height of the fixed tube 31 is fixed, the rotating sleeve 34 presses on the bone surface, and the rotating sleeve 34 can remain stationary during the rotation of the trephine 1, thus not causing wear to the bone surface, making it safe and convenient to use.

[0047] Figures 1 - 2 and Figure 5 The second embodiment is shown. The main difference from the first embodiment is that: a drill bit connecting piece 5 is also provided at the top of the trephine 1 for connecting the trephine 1 to an electric drill. The drill bit connecting piece 5 is composed of a prism section 51, a threaded section 52, and a plug-in section 53 from top to bottom. The middle of the plug-in section 53 is an insertion tube inserted into the interior of the trephine 1, and convex ribs inserted into the insertion notches 11 are provided at both ends of the insertion tube. External threads are provided on the outside of the top end of the trephine 1, and a threaded locking tube 6 is commonly thread-connected to the threaded section 52 of the drill bit connecting piece 5 and the external threads of the trephine 1, and the tightening rotation direction of the threaded locking tube 6 is the same as the rotation direction of the trephine 1 during operation.

[0048] By providing the drill bit connecting piece 5, through the operations of first plugging and then tightening, it can be stably connected to the trephine 1 and is convenient for installation on the electric drill, and the installation and disassembly are simple and convenient.

[0049] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0050] During use, first loosen the screw 32, slide the locator 3 to a suitable height with reference to the scale, and then tighten the screw 32 to lock the locator 3;

[0051] Insert the drill bit connecting piece 5 into the top end of the trephine 1, then rotate the threaded locking tube 6 to make it rise to lock the drill bit connecting piece 5, and then the trephine 1 can be installed on the electric drill through the drill bit connecting piece 5;

[0052] At this time, align the trephine 1 with the cartilage, then start the electric drill to drive the trephine 1 to rotate, so that it cuts the cartilage and drills out the cartilage column. After pulling out the trephine 1 to bring out the cartilage column, slide down the sliding sleeve 22 so that the ejector rod 21 ejects the cartilage column, and after releasing the hand, the bone extractor 2 resets under the resilience of the elastic member 4.

[0053] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0054] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A cartilage defect modeling device, characterized in that: include: Trephine drill, with serrations at the bottom for drilling into cartilage to obtain cartilage; The bone extractor comprises a push rod disposed inside the trephine for ejecting the cartilage to be extracted, and also comprises a sliding sleeve penetrating the trephine and sleeved outside the trephine for pushing the push rod to slide axially for ejection operation, wherein the push rod is threadedly connected to the inner side of the sliding sleeve for adjusting the overall length of the bone extractor; A locator is sleeved on the outside of the drilling end of the trephine, the height of the locator on the trephine can be adjusted, and a damping structure for increasing the friction of the locator is arranged on the side of the trephine, and scale lines are arranged on the side of the trephine and between the damping structures; The locator comprises: A fixing tube is sleeved on the outside of the trephine and fixed by screws on both sides, and a convex ring is arranged on the outside of the fixing tube; The rotating sleeve is composed of a disc at the bottom and a round tube at the center of its top, which is sleeved outside the fixed tube and axially positioned by a convex ring; The damping structure is an anti-slip strip embedded and pasted on both sides of the trephine, and the positioner is pressed against the surface of the anti-slip strip by tightening the screws to fix the position.

2. The cartilage defect modeling device according to claim 1, characterized in that: A screw sleeve matched with the push rod is arranged inside the sliding sleeve, notches matched with the two sides of the screw sleeve are opened on both sides of the top of the trephine, and a screwdriver groove is opened on the top of the push rod.

3. The cartilage defect modeling device according to claim 1, characterized in that: A positioning ring is arranged outside the trephine and below the notch, and an elastic member is sleeved outside the trephine and between the positioning ring and the sliding sleeve.

4. The cartilage defect modeling device according to claim 1, characterized in that: A drill bit connector is also provided on the top of the trephine for connecting the trephine to an electric drill.

5. The cartilage defect modeling device according to claim 4, characterized in that: The drill bit connector is composed of a prism section, a threaded section and a plug section from top to bottom. The middle of the plug section is a plug tube inserted into the trephine, and both ends of the plug tube are provided with convex edges inserted into the notch.

6. The cartilage defect modeling device according to claim 5, characterized in that: The top of the trephine is provided with threads on the outside, the threaded section of the drill bit connector and the threaded outside of the trephine are threadedly connected with a threaded locking tube, and the tightening direction of the threaded locking tube is consistent with the direction of rotation of the trephine when working.

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