Tumor extension rod implant with adjustable length

Abstract

The utility model discloses a length-adjustable tumor extension rod implant which comprises a first combined rod used for being connected with other components and a second combined rod used for being implanted into a bone medullary cavity, the second combined rod is provided with a connecting end, and at least part of the connecting end is arranged in the first combined rod in a sleeved mode. A transmission rod capable of moving in the extending direction of the second combined rod is arranged in the connecting end, driven pieces arranged towards the transmission rod are arranged on the two opposite sides of the connecting end, and each driven piece comprises a first extending part arranged towards the transmission rod and a second extending part connected with the first extending part and forming an included angle with the first extending part. The first extension part is located on the moving path of the transmission rod and can be driven by the transmission rod to rotate in the same direction as the transmission rod, the second extension part and the first extension part synchronously rotate to abut against the inner wall face of the connecting end, and the connecting end is extruded and fixed to the inner wall face of the first combined rod. Compared with the prior art, the tumor extension rod implant has practicability by changing the length of the tumor extension rod implant.

Description

TECHNICAL FIELD

[0001] The utility model relates to a length adjustable tumor extension rod implant belongs to the field of medical instrument. BACKGROUND

[0002] The tumor implant contains a component, extension rod, which is deeply buried in the distal femur or humerus by surgery, and the length of the extension rod is not the same due to the different positions of the tumor.

[0003] At present, the solution of each manufacturer is to store extension rods of multiple lengths. However, the storage cost is relatively high.

[0004] Therefore, it is necessary to improve the existing tumor extension rod implant to solve the above problems. SUMMARY

[0005] To solve the above technical problems, the utility model provides a length adjustable tumor extension rod implant, which can change the length of the extension rod and reduce the cost.

[0006] The technical scheme of the utility model is:

[0007] A length adjustable tumor extension rod implant, comprising a first combination rod for connecting with other components and a second combination rod for implanting inside the bone marrow cavity, the second combination rod has a connecting end at least partially sleeved inside the first combination rod, a transmission rod movable along the extension direction of the second combination rod is arranged in the connecting end, opposite sides of the connecting end are provided with driven elements facing the transmission rod, the driven element comprises a first extension part facing the transmission rod and a second extension part forming an included angle with the first extension part, the first extension part is located on the movement path of the transmission rod and can be driven by the transmission rod to rotate in the same direction as the transmission rod, and the second extension part rotates synchronously with the first extension part to abut against the inner wall surface of the connecting end and extrudes and fixes the connecting end on the inner wall surface of the first combination rod.

[0008] As a further improvement of the utility model, the first extension part is connected with the transmission rod and can move synchronously with the transmission rod under the driving of the transmission rod.

[0009] As a further improvement of the utility model, a through groove is arranged on one side of the transmission rod relative to the driven element, and the first extension part at least partially extends into the groove to be fixedly connected with the transmission rod.

[0010] As a further improvement of the utility model, the grooves are at least multiple and arranged on the extension body of the transmission rod, the driven members are correspondingly and staggeredly arranged on the opposite sides of the transmission rod.

[0011] As a further improvement of the utility model, the included angle between the first extension part and the second extension part is 90°, and the ratio of the length of the first extension part to the length of the second extension part is between 2:1 and 2.5:1.

[0012] As a further improvement of the utility model, during the rotation of the driven member, the included angle between the second extension part and the vertical direction perpendicular to the horizontal plane is between 0 and 60º.

[0013] As a further improvement of the utility model, the opposite sides of the connecting end are provided with movable arms capable of tilting towards the inner wall surface of the first combination rod, the movable arms are provided with fittings arranged towards the direction of the transmission rod, and the driven member is at least partially accommodated in the fittings.

[0014] As a further improvement of the utility model, the second extension part of the driven member is fixedly connected with the fitting to drive the fitting to rotate in the same direction, drive the fitting to rotate to abut against the movable arm, and extrude and fix the movable arm on the inner wall surface of the first combination rod.

[0015] As a further improvement of the utility model, the first extension part is connected with the transmission rod and has a first positioning point, the second extension part is connected with the fitting and has a second positioning point, the second positioning point is away from the connecting point of the first extension part and the second extension part, when the first positioning point and the second positioning point are located on the same horizontal plane, the first extension part limits the transmission rod to continue moving away from the direction of the connecting end.

[0016] As a further improvement of the utility model, the second combination rod further has a screw rod and an elastic member, the elastic member connects the screw rod and the transmission rod, so that when the screw rod is driven, the transmission rod is synchronously moved by the elastic member.

[0017] The utility model discloses the beneficial technical effects are: the utility model discloses a part of the inside of the first combination pole is set up the connecting end of at least partial sleeve in the second combination pole, and the transmission rod that can move along the extension direction of second combination pole is set up in the connecting end, and the opposite sides of connecting end are equipped with the follower that sets up to transmission rod, and the follower includes the first extension part that sets up to transmission rod and the second extension part that forms the included angle and is connected with the first extension part, and the first extension part is located the moving path of transmission rod, and can be driven to rotate with transmission rod with transmission rod, and the second extension part rotates synchronously with the first extension part to abut with the inner wall surface of connecting end, and extruding fixed on the inner wall surface of first combination pole with connecting end. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of the adjustable length's tumor extension pole implant of preferred embodiment of the utility model.

[0019] Figure 2 It is Figure 1 The structure schematic diagram of second combination pole in it.

[0020] Figure 3 It is Figure 2 The structure schematic diagram of transmission rod, follower and assembly part in it.

[0021] Figure 4 It is Figure 3 The sectional view of it. DETAILED DESCRIPTION

[0022] In order to can more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the specific embodiment of the utility model is further detailed below, the following examples are used to explain the utility model, but not to limit the scope of the utility model.

[0023] Please refer to Figures 1 to 4 The utility model discloses a kind of adjustable length's tumor extension pole implant 100, described including tumor extension pole implant 100 for being connected with other components first combination pole 1 and for being implanted in the second combination pole 2 inside bone marrow cavity, described second combination pole 2 has at least partial sleeve in the inside of the connecting end 21 of first combination pole 1, transmission rod 3 in the connecting end 21 is equipped with can move along the extension direction of second combination pole 2, the opposite sides of connecting end 21 are equipped with follower 4 that sets up to transmission rod 3.

[0024] The driven part 4 comprises a first extension part 41 arranged towards the transmission rod 3, and a second extension part 42 connected with the first extension part 41 and forming an included angle, the first extension part 41 is located on the moving path of the transmission rod 3 and can be driven by the transmission rod 3 to rotate in the same direction as the transmission rod 3, and the second extension part 42 rotates synchronously with the first extension part 41 to abut against the inner wall surface of the connecting end 21 and press the connecting end 21 to be fixed on the inner wall surface of the first combined rod 1.

[0025] In other words, in use, the length of the connecting end 21 inside the first combined rod 1 is adjusted first, that is, the overall length of the tumor lengthening rod implant 100 is adjusted. At this time, by moving the transmission rod 3, the first extension part 41 can be driven to rotate synchronously, and then the second extension part 42 is rotated to abut against the inner wall surface of the connecting end 21 and is pressed to be in close contact with the first combined rod 1, so that the fixed connection of the first combined rod 1 and the second combined rod 2 is realized, and the length of the tumor lengthening rod implant 100 is positioned. In this way, various different length requirements can be used, which is practical.

[0026] Preferably, the opposite sides of the connecting end 21 are provided with movable arms 211 that can be inclined towards the inner wall surface of the first combined rod 1, and the movable arms 211 are provided with fittings 212 arranged towards the transmission rod 3, and the driven part 4 is at least partially accommodated in the fittings 212. In this way, the fixing of the two can be realized by pushing the movable arms 211 to be inclined towards the inner wall surface of the first combined rod 1.

[0027] In this embodiment, the second extension part 42 of the driven part 4 is fixedly connected with the fitting 212 to drive the fitting 212 to rotate in the same direction, and drive the fitting 212 to rotate to abut against the movable arm 211 and press the movable arm 211 to be fixed on the inner wall surface of the first combined rod 1.

[0028] Optionally, the side of the fitting 212 close to the movable arm 211 is provided with a slope surface, and the second extension part 42 is located on the slope surface and can move along the slope surface to abut against the inner wall surface of the movable arm 211 and press the movable arm 211 to be fixed on the inner wall surface of the first combined rod 1.

[0029] Preferably, the distance from the upper surface of the slope surface to the top of the fitting 212 is greater than the length of the second extension part 42, so that the rotating direction of the second extension part 42 can be limited. Of course, in other embodiments, it can also not be thus arranged, which is not limited.

[0030] In the embodiment, the angle between the first extension 41 and the second extension 42 is 90°, that is, the entire driven member 4 is L-shaped, and the ratio of the length of the first extension 41 to the length of the second extension 42 is between 2:1 and 2.5:1. That is, the long side of the driven member 4 is in mutual transmission with the transmission rod 3, and the short side of the driven member 4 is used to press and fix the movable arm 211 on the first combined rod 1.

[0031] In the embodiment, when the stretching does not start, the first extension 41 extends in a direction parallel to the horizontal plane towards the transmission rod 3, and the second extension 42 extends vertically in a direction perpendicular to the horizontal plane, at this time, the angle between the second extension 42 and the vertical direction perpendicular to the horizontal plane is 0°. During the rotation of the driven member 4, the angle between the second extension 42 and the vertical direction perpendicular to the horizontal plane is between 0° and 60°. Preferably, the maximum angle between the second extension 42 and the vertical direction perpendicular to the horizontal plane can be 45°, 50°, or 60°.

[0032] The first extension 41 is connected with the transmission rod 3 and can move synchronously with the transmission rod 3 under the driving of the transmission rod 3. The side of the transmission rod 3 relative to the driven member 4 is provided with a through groove 31, and the first extension 41 at least partially extends into the groove 31 to be fixedly connected with the transmission rod 3. Therefore, when the transmission rod 3 moves, the movement of the groove 31 will bring the first extension 41 to tilt synchronously.

[0033] The first extension 41 is connected with the transmission rod 3 and has a first positioning point 411, the second extension 42 is connected with the assembly 212 and has a second positioning point 421, the second positioning point 421 is away from the connection point of the first extension 41 and the second extension 42, when the first positioning point 411 and the second positioning point 421 are located on the same horizontal plane, the first extension 41 limits the transmission rod 3 to continue moving away from the connection end 21. At this time, it is the maximum rotation angle of the driven member 4. In the embodiment, the connection point of the first extension 41 and the second extension 42 is also fixed with the assembly 212, so as to synchronously drive the assembly 212 to rotate.

[0034] Preferably, in the extension direction of the transmission rod 3, the groove 31 has a first end 311 above the first extension 41 and a second end 312 below the first extension 41, and the connection point of the transmission rod 3 and the first extension 41 is arranged close to the first end 311.

[0035] In the embodiment, the grooves 31 are arranged at least in plurality and on the extending body of the transmission rod 3, and the followers 4 are arranged on opposite sides of the transmission rod 3 correspondingly and staggeredly with the grooves 31. In this way, the balance of the connecting end 21 on both sides can be achieved. At this time, the second end 312 of the groove 31 becomes the first end 311 of the next groove 31, and drives the next follower 4 to move synchronously.

[0036] Of course, the grooves 31 can not be arranged, and the first extending part 41 is connected with the transmission rod 3, so that the first extending part 41 can move synchronously with the transmission rod 3 under the driving of the transmission rod 3. In this way, the same technical effect can also be achieved, but in this way, other limiting members need to be arranged to limit the movement distance of the transmission rod 3.

[0037] The second combination rod 2 further comprises a screw rod and an elastic member, and the elastic member connects the screw rod and the transmission rod 3, so that when the screw rod is driven, the transmission rod 3 is driven to move synchronously by the elastic member. The screw rod and the elastic member give the transmission rod 3 a driving force. The restoring force of the elastic member also gives the transmission rod 3 a restoring force. In the embodiment, the bottom of the second combination rod 2 is provided with a screw hole, and the screw hole is opposite to the screw rod. By screwing with a screwdriver, the screw rod can be rotated, and then the transmission rod 3 is driven to move by the elastic member.

[0038] In summary, the length-adjustable tumor extension rod implant 100 of the utility model is characterized in that a connecting end 21 which is at least partially arranged in the first combination rod 1 is arranged on the second combination rod 2, a transmission rod 3 which can move along the extending direction of the second combination rod 2 is arranged in the connecting end 21, followers 4 which are arranged on opposite sides of the connecting end 21 are arranged towards the transmission rod 3, the follower 4 comprises a first extending part 41 which is arranged towards the transmission rod 3 and a second extending part 42 which is connected with the first extending part 41 and forms an included angle, the first extending part 41 is located on the movement path of the transmission rod 3 and can be driven by the transmission rod 3 to rotate in the same direction as the transmission rod 3, the second extending part 42 rotates synchronously with the first extending part 41 to abut against the inner wall surface of the connecting end 21, and the connecting end 21 is pressed and fixed on the inner wall surface of the first combination rod 1. In this way, by adjusting the length of the connecting end 21 in the first combination rod 1, the length of the tumor extension rod implant 100 can be adjusted, and the connecting end 21 is fixed on the first combination rod 1 by pulling the transmission rod 3 to drive the follower 4. In this way, the fixed connection of the first combination rod 1 and the second combination rod 2 is achieved, different use conditions can be adapted, and the production cost is reduced.

[0039] The above merely is preferred implementation manner of the present application, and is not used for limiting the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the technical principle of the present application, can also make several improvements and variations, these improvements and variations also should be regarded as the protection scope of the present application.

Claims

1. An adjustable-length tumor extension rod implant, characterized in that, The utility model provides a kind of combination rod for connecting with other components (1) and the second combination rod (2) for implanting inside bone marrow cavity, the second combination rod (2) has at least part of the inside of the first combination rod (1) is set in the connecting end (21), the connecting end (21) is equipped with the transmission rod (3) that can be moved along the extension direction of the second combination rod (2), the opposite sides of the connecting end (21) are equipped with follower (4) towards the transmission rod (3), the follower (4) includes the first extension (41) towards the transmission rod (3) and the second extension (42) and the first extension (41) are connected and form angle, the first extension (41) is located on the moving path of the transmission rod (3), and can be driven by the transmission rod (3) to rotate with the transmission rod (3), the second extension (42) is synchronously rotated with the first extension (41) and is abutted with the inner wall surface of the connecting end (21), and the connecting end (21) is extruded and fixed on the inner wall surface of the first combination rod (1).

2. The tumor extender rod implant of claim 1, wherein, The first extension (41) is connected with the transmission rod (3) and can move synchronously with the transmission rod (3) under the drive of the transmission rod (3).

3. The tumor extender rod implant of claim 2, wherein, The side of the transmission rod (3) relative to the follower (4) is provided with a through groove (31), and the first extension (41) at least partially extends into the groove (31) to be fixedly connected with the transmission rod (3).

4. The tumor extender rod implant of claim 3, wherein, The groove (31) is provided with at least a plurality of grooves and is arranged on the extension body of the transmission rod (3), and the follower (4) is correspondingly arranged on the opposite sides of the transmission rod (3).

5. The tumor extender rod implant of claim 1, wherein, The angle between the first extension (41) and the second extension (42) is 90°, and the ratio of the length of the first extension (41) to the length of the second extension (42) is between 2:1 and 2.5:

1.

6. The tumor extender rod implant of claim 1, wherein, During the rotation of the follower (4), the angle between the second extension (42) and the vertical direction perpendicular to the horizontal plane is between 0° and 60°.

7. The tumor extender rod implant of claim 1, wherein, The opposite sides of the connecting end (21) are provided with movable arms (211) that can be inclined towards the inner wall surface of the first combination rod (1), the movable arms (211) are provided with fittings (212) towards the transmission rod (3), and the follower (4) is at least partially accommodated in the fittings (212).

8. The tumor extender rod implant of claim 7, wherein, The second extension (42) of the follower (4) is fixedly connected with the fitting (212) to drive the fitting (212) to rotate in the same direction, and drives the fitting (212) to abut against the movable arm (211) and extrude and fix the movable arm (211) on the inner wall surface of the first combination rod (1).

9. The tumor extender rod implant of claim 8, wherein, The first extension part (41) is connected with the transmission rod (3) and has a first positioning point (411), the second extension part (42) is connected with the assembling part (212) and has a second positioning point (421), the second positioning point (421) is away from the connecting point of the first extension part (41) and the second extension part (42), when the first positioning point (411) and the second positioning point (421) are located on the same horizontal plane, the first extension part (41) limits the transmission rod (3) to continue moving in the direction away from the connecting end (21).

10. The tumor extender rod implant of claim 1, wherein, There is also a screw rod and an elastic element in the second combined rod (2), the elastic element connects the screw rod and the transmission rod (3), so that the transmission rod (3) is driven to move synchronously through the elastic element when the screw rod is driven.

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