Anti-pull-out orthopedic positioning needle

Abstract

The utility model discloses an anti-pullout orthopaedic positioning needle, which relates to the field of medical auxiliary instruments and comprises a needle body, one end of the needle body is of a hollow structure, the other end of the needle body is provided with a cutting edge, and the end, close to the cutting edge, of the needle body is provided with two grooves which correspond to each other up and down; the number of the pawls is two, the pawls are hinged to the positions of the grooves, and one ends of the pawls extend out of the grooves. The driving mechanism is movably mounted in the hollow structure of the needle body, one end of the driving mechanism is connected with the two pawls, and the other end of the driving mechanism extends out of the needle body. According to the utility model, the pawls are adopted to form a physical barb structure to hook peripheral sclerotin, so that the positioning needle cannot fall off, and the conventional way of fixing the positioning needle by depending on the friction force of bones and the surface of a needle body is replaced, so that the firmness of the positioning column is greatly improved; and the pawl can be opened by screwing the protective cover or operating the arranged driving mechanism through a screwdriver to push the pawl, the pawl can be opened by a single person without additional instruments, and operation is easy and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical auxiliary instrument, especially a kind of anti-pulling orthopedic positioning needle. BACKGROUND

[0002] In orthopedic trauma, spine, joint and other operations, orthopedic positioning needle is an important tool in the surgical process, it can be implanted into human body as internal fixation consumables or as auxiliary instrument of other internal fixation consumables, orthopedic positioning needle is clamped on electric tool when using, and orthopedic positioning needle is driven into bone by high-speed rotation of electric tool and the thrust exerted by doctor, its role mainly has two aspects:

[0003] 1, long-term fixation of fracture or temporary fixation of fracture: metal bone needle is often used to fix the bone pieces of fracture in correct position, promotes the healing of fracture. By inserting bone needle into bone marrow cavity or bone tissue near fracture, it can stabilize the skeleton, prevent displacement or misplacement of fracture, provide support and maintain correct anatomical structure, so as to promote the healing of fracture. It can also be used to temporarily fix bone fragments during orthopedic surgery to maintain the positional relationship of bone fragments after reduction to install other internal fixation products.

[0004] 2, orientation and positioning: when using cannulated bone screw to treat fracture, metal bone needle is driven in advance to provide an accurate path for subsequent drill, tap, installation of cannulated screw, etc. to achieve minimally invasive treatment.

[0005] The existing technology, as shown in Figure 1 , ordinary orthopedic positioning needle surface is smooth without any design to prevent positioning needle from sliding out of bone; as shown in Figure 2 , threaded orthopedic positioning needle, head has screw thread to prevent positioning needle from sliding out of bone; as shown in Figure 3 , orthopedic positioning needle with inflatable inner core, the instrument is pulled back to expand the inner core to expand the head of orthopedic positioning needle to increase the friction with the bone and prevent it from sliding out.

[0006] The above existing technology has the following shortcomings:

[0007] 1, ordinary orthopedic positioning needle and threaded orthopedic positioning needle have insufficient friction after being driven into bone and are easy to slide out.

[0008] 2, when using cannulated bone screw to treat fracture, bone chips filled in the drill hole when the cannulated drill passes through the orthopedic positioning needle are easy to take the positioning needle out of the bone.

[0009] 3, orthopedic positioning needle with inflatable inner core is complex to operate, the diameter of the head is limited, and it is still easy to slide out of the bone due to insufficient friction. SUMMARY

[0010] In order to overcome the above-mentioned defects of the prior art, the utility model provides an anti -pulling out orthopedics positioning needle to solve the problems in the above -mentioned background art.

[0011] The utility model provides the following technical scheme: an anti -pulling out orthopedics positioning needle, including:

[0012] The needle body is hollow at one end and is provided with a blade at the other end, and two upper and lower corresponding grooves are formed at the end of the needle body close to the blade;

[0013] The pawls are two in number, are hingedly connected at the groove positions and have tail ends extending out of the grooves;

[0014] The driving mechanism is movably installed in the hollow structure of the needle body, one end of the driving mechanism is connected with the two pawls, the other end of the driving mechanism extends out of the needle body, and the driving mechanism drives the two pawls to approach or move away from each other to realize the retraction and expansion of the pawls.

[0015] Preferably, two front and rear corresponding mounting grooves are formed at the groove positions of the needle body, the two pawls are rotatably installed at the grooves through connecting shafts, the other end of the needle body is provided with a connecting end, and an internal thread is formed on the inner wall of the connecting end.

[0016] Preferably, the driving mechanism comprises a push rod, connecting rods, a screw rod and a protective cover, the push rod is slidably arranged in the needle body, the two connecting rods are hingedly connected at one end of the push rod, the other ends of the connecting rods are rotatably connected with the pawls respectively, the screw rod is rotatably installed at the other end of the push rod, and the protective cover covers one end of the screw rod.

[0017] Preferably, a spring is sleeved at the tail end of the screw rod, gaskets are arranged at the two ends of the spring respectively, a positioning pin is arranged on one of the gaskets, and a pin hole is formed at the tail end of the screw rod.

[0018] Preferably, the screw rod is screwed into the connecting end, and the side end of the connecting end abuts against the gasket.

[0019] Preferably, the tail end of the pawl is provided with a 45-degree sharp angle.

[0020] Preferably, the end of the needle body close to the connecting end is provided with an anti-rotation plane.

[0021] Preferably, the blade is provided with three parts, and the three parts of the blade are arranged in a conical structure.

[0022] Preferably, one end of the screw rod is provided with a keyway.

[0023] Preferably, the outer surface of one end of the protective cover is provided with knurling.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] The utility model discloses a physical barb structure is formed to the ratchet pawl set, and the positioning needle can not be taken out by the surrounding bone, replaces the present fixed positioning needle by relying on the friction force of bone and needle body surface, greatly improves the firmness of positioning column, and the opening of ratchet pawl can be realized through the drive mechanism of screwing protective cover or screwdriver control setting and advancing ratchet pawl, and one person can open ratchet pawl without additional instrument, and the operation is simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is one of the prior art structure schematic diagram of the utility model.

[0027] Figure 2 It is another prior art structure schematic diagram of the utility model.

[0028] Figure 3 It is still another prior art structure schematic diagram of the utility model.

[0029] Figure 4 It is the structure schematic diagram of the ratchet pawl unfolded state of the utility model.

[0030] Figure 5 It is the structure schematic diagram of the ratchet pawl recycling state of the utility model.

[0031] Figure 6 It is the needle body three-dimensional structure schematic diagram of the utility model.

[0032] Figure 7 It is the needle body cross section structure schematic diagram of the utility model.

[0033] Figure 8 It is the drive mechanism connecting structure schematic diagram of one of the states of the utility model.

[0034] Figure 9 It is the drive mechanism connecting structure schematic diagram of another state of the utility model.

[0035] Figure 10 It is the drive mechanism cross section structure schematic diagram of one of the states of the utility model.

[0036] Figure 11 It is the screw rod, protective cover connecting structure schematic diagram of the utility model.

[0037] Figure 12 It is the needle body part cross section structure schematic diagram of the utility model.

[0038] Figure 13 It is the ratchet pawl structure schematic diagram of the utility model.

[0039] Figure 14 It is the ratchet pawl installation front view structure schematic diagram of the utility model.

[0040] Figure 15 It is a connecting rod structure schematic view of the utility model.

[0041] Figure 16 It is a push rod, screw rod connecting structure schematic view of the utility model.

[0042] The figure mark is: 1, needle body;11, recess;111, circular arc groove;12, cutting edge;13, installation groove;14, connecting end;15, anti-rotation plane;2, ratchet pawl;21, circular end;22, first arc surface;3, driving mechanism;31, push rod;311, convex groove;32, connecting rod;321, second arc surface;33, screw rod;331, right-hand thread;332, stepped shaft;34, protective cover;35, spring;36, gasket;37, pin hole;38, positioning pin;4, connecting shaft;41, third arc surface. DETAILED DESCRIPTION

[0043] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0044] The utility model provides a kind of anti-pulling orthopedics positioning needle, as shown in Figures 4-16 ,

[0045] Including:

[0046] Needle body 1, one end is hollow structure, the other end is provided with cutting edge 12, needle body 1 is close to the end of cutting edge 12 and is equipped with two upper and lower corresponding recesses 11;

[0047] Ratchet pawl 2, the number is two, is hinged in recess 11 position and its tail end extends out of recess 11;

[0048] Driving mechanism 3, movably installed in the hollow structure inside needle body 1, and one end of driving mechanism 3 is connected with two ratchet pawls 2, the other end extends out of needle body 1, by driving mechanism 3, it drives two ratchet pawls 2 to realize the recovery and deployment of ratchet pawl 2 by being close to each other or away from each other.

[0049] In the embodiment, needle body 1 is located in recess 11 position and is equipped with two front and rear corresponding installation grooves 13, two ratchet pawls 2 are rotatably installed at recess 11 by connecting shaft 4, the other end of needle body 1 is provided with connecting end 14, and the inner wall of connecting end 14 is provided with internal thread.

[0050] In the embodiment, the driving mechanism 3 comprises a push rod 31, two connecting rods 32, a screw rod 33 and a protective cover 34, wherein the push rod 31 is slidably arranged inside the needle body 1, the two connecting rods 32 are hingedly connected to one end of the push rod 31, the other end of the connecting rods 32 are respectively rotatably connected to the pawls 2, the screw rod 33 is rotatably arranged at the other end of the push rod 31, the protective cover 34 covers one end of the screw rod 33, the push rod 31 is moved forward and backward inside the needle body 1 by rotating the screw rod 33, so as to pull the two connecting rods 32, and the connecting rods 32 drive the two pawls 2 to expand or retract.

[0051] In the embodiment, the outer surface of the connecting rod 32 is provided with a second arc surface 321, the edge of the connecting rod is designed as a non-straight edge and smoothly transitions with the outer diameter surface of the positioning needle, and the connecting rod will not cut the bone excessively when the positioning needle is rotated and implanted.

[0052] In the embodiment, the tail end of the screw rod 33 is sleeved with a spring 35, the two ends of the spring 35 are respectively provided with a gasket 36, one of the gaskets 36 is provided with a positioning pin 38, the tail end of the screw rod 33 is provided with a pin hole 37, the length of the positioning pin 38 is less than the depth of the positioning pin hole 37, so as to avoid interference, the two ends of the spring 35 are welded with the gaskets 36, so that the tension of the spring 35 is more evenly distributed to the screw rod 33 and the needle body 1, the axial pre-tightening force provided by the gaskets 36 can eliminate the thread movement gap to ensure smooth operation of the screw rod 33 and provide a damping feeling to prevent misoperation, and the rear end surface of the protective cover 4 and the front end surface of the tail cap of the screw rod 33 are welded to form an integrated body, which can shield the internal spring 35 to make the product more beautiful.

[0053] In the embodiment, the screw rod 33 is screwed into the connecting end 14 and makes the side end of the connecting end 14 abut against the gasket 36, the end of the screw rod 33 close to the protective cover 34 is provided with a right-handed thread 331, the right-handed thread 331 is matched with the internal thread, and the right-handed thread 331 can prevent the electric tool from slipping when it is rotated clockwise to drive the screw rod to open the pawls at an inappropriate depth.

[0054] In the embodiment, the tail end of the pawl 2 is provided with a 45° sharp corner, which can ensure the strength of the pawl 2 and more easily hook the surrounding bone, and the one end of the pawl 2 is designed as a circular end, the outer surface of the pawl 2 is provided with a first arc surface 22, the edge of the pawl 2 is designed as a non-straight edge and smoothly transitions with the outer diameter surface of the positioning needle, and the pawl will not cut the bone excessively when the positioning needle is rotated and implanted.

[0055] In the embodiment, the end of the recess 11 close to the cutting edge is provided with a circular arc groove for matching with the circular end 21 of the pawl 2, which can reduce the amount of material removed, increase the strength of the head of the positioning needle, and form a smaller cavity, so that the positioning needle is not easy to jam when it is rotated.

[0056] In the embodiment, the end of the needle body 1 close to the connecting end 14 is provided with an anti-rotation flat surface 15 for connecting the electric tool.

[0057] In this embodiment, the third arc surface 41 is arranged at both ends of the connecting shaft 4, and the non-straight edge design of the connecting shaft end surface smoothly transitions with the outer diameter surface of the positioning needle. When the positioning needle is rotated and implanted, the connecting pin will not unnecessarily cut the bone.

[0058] In this embodiment, three blade edges 12 are arranged in a conical structure, which facilitates the cutting of the positioning needle into the bone.

[0059] In this embodiment, the screw 33 is provided with a keyway at one end, which can be used with a universal screwdriver to increase the rotational torque, allowing the screwdriver to be used manually to connect the screw tail cap keyway and rotate the screw.

[0060] In this embodiment, the outer surface of one end of the protective cover 34 is provided with knurling, which increases the friction with the hand and facilitates the rotation of the screw 33.

[0061] In this embodiment, the screw 33 is provided with a stepped shaft 332 at one end, and the push rod 31 is provided with a convex groove 311 at one end. The stepped shaft 332 is embedded in the convex groove 311 and is installed in rotation, which can convert the rotational motion of the screw into linear motion.

[0062] In use, when the orthopedic positioning needle pawl is not expanded as shown in Figure 5 , the orthopedic positioning needle is clamped on the electric tool, and the orthopedic positioning needle is driven into the bone by the high-speed rotation of the electric tool and the active pushing force applied by the doctor.

[0063] When the orthopedic positioning needle is driven into the bone to the appropriate depth, the electric tool is removed, and the orthopedic positioning needle body is fixed by the anti-rotation plane 15. The screw tail cap keyway is rotated by the screwdriver 33, and the screw 33 is rotated forward. The gasket 36 provides an axial pre-tightening force to eliminate the thread movement gap, ensure the screw thread sliding operation, and provide damping feeling to prevent misoperation. The screw 33 moves forward, driving the push rod 31 to move forward. When the push rod 31 moves forward, the pawl 2 is expanded by the connecting rod 32 until the pawl 2 is completely expanded when the protective sleeve 4 front end surface collides with the needle body 1 stepped surface, forming a barb structure to firmly hook the surrounding bone and cannot be pulled out, as shown in Figure 4 .

[0064] When the orthopedic positioning needle needs to be removed, the screw tail cap is rotated clockwise, and the pawl 2 is retracted into the needle body 1 to remove the positioning needle, as shown in Figure 5 .

[0065] It should be noted that: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0066] The above merely describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments, but any equivalent modifications or changes made by those skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A pull-out resistant orthopedic positioning pin, characterized in that, include: The needle body (1) has a hollow structure at one end and a cutting edge (12) at the other end. Two grooves (11) with corresponding upper and lower sides are opened at the end of the needle body (1) near the cutting edge (12). Two pawls (2) are hinged in the groove (11) and their tails extend out of the groove (11). The drive mechanism (3) is movably installed inside the hollow structure of the needle body (1), and one end of the drive mechanism (3) is connected to two pawls (2), and the other end extends out of the needle body (1). The drive mechanism (3) drives the two pawls (2) to move closer or further apart to realize the retraction and unfolding of the pawls (2).

2. The anti-pullout orthopedic positioning pin according to claim 1, characterized in that: The needle body (1) has two corresponding mounting slots (13) at the groove (11). Two pawls (2) are rotatably mounted at the groove (11) via a connecting shaft (4). The other end of the needle body (1) is provided with a connecting end (14), and the inner wall of the connecting end (14) is provided with an internal thread.

3. The anti-pullout orthopedic positioning pin according to claim 1, characterized in that: The drive mechanism (3) includes a push rod (31), a connecting rod (32), a screw (33), and a protective cover (34). The push rod (31) is slidably placed inside the needle body (1). Two connecting rods (32) are hinged to one end of the push rod (31), and the other end of the connecting rods (32) is rotatably connected to the pawl (2). The screw (33) is rotatably installed on the other end of the push rod (31), and the protective cover (34) covers one end of the screw (33).

4. The anti-pullout orthopedic positioning pin according to claim 3, characterized in that: A spring (35) is sleeved at the tail end of the screw (33), and a washer (36) is provided at both ends of the spring (35). A positioning pin (38) is provided on one of the washer (36), and a pin hole (37) is opened at the tail end of the screw (33).

5. The anti-pullout orthopedic positioning pin according to claim 4, characterized in that: The screw (33) is screwed into the connecting end (14) and the side end of the connecting end (14) abuts against the gasket (36).

6. The anti-pullout orthopedic positioning pin according to claim 1, characterized in that: The tail end of the pawl (2) is provided with a 45° sharp angle.

7. The anti-pullout orthopedic positioning pin according to claim 1, characterized in that: The needle body (1) has an anti-rotation plane (15) at one end near the connecting end (14).

8. The anti-pullout orthopedic positioning pin according to claim 1, characterized in that: The cutting edge (12) is provided in three places, and the three cutting edges (12) are arranged in a conical structure.

9. The anti-pullout orthopedic positioning pin according to claim 3, characterized in that: One end of the screw (33) is provided with a plum blossom groove.

10. The anti-pullout orthopedic positioning pin according to claim 3, characterized in that: The outer surface of one end of the protective cover (34) is provided with knurling.

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