A bone hole rapid expansion and fixing device

Abstract

The invention discloses a bone hole rapid expansion and fixing device, and relates to the field of surgical auxiliary fixing devices. The device comprises a main body, a knob, a cam wrench and a movable expansion body. The front end of the main body is provided with a fixed expansion body, an axial hole is provided inside, and a thread is provided at the end. The knob is installed at the end of the main body through the thread, and the knob is provided with a push rod. The cam wrench comprises a cam part and a wrench part, and the cam part is installed in the slot of the main body at the rear section of the axial hole; the movable expansion body is connected with a push rod, and the push rod is installed at the front section of the axial hole. The movable expansion body and the fixed expansion body are both provided with an expansion part, and the end section of the expansion part is provided with a toothed claw; the push rod, the cam part and the push rod are connected in sequence in the axial hole. When the knob is turned, the push rod moves against the cam part, and the cam part moves against the push rod to carry the movable expansion body to be initially expanded. By pulling the wrench part, the cam part is rotated from the lower dead center to the upper dead center, and the push rod is moved again for a distance to further expand the movable expansion body.

Description

Technical Field

[0001] The invention relates to the field of surgical auxiliary fixation devices, and in particular to a bone hole rapid expansion fixation device. Background Art

[0002] Surgical instrument fixation devices are commonly used surgical auxiliary devices in surgical operations. Currently, surgical instrument fixation devices in surgery are relatively complex in structure, bulky, expensive, and inconvenient to operate. Due to these shortcomings, their clinical applications are limited.

[0003] A Chinese patent with patent number CN109009485A discloses a surgical auxiliary fixation device, including a bone hole distraction fixation assembly, the bone hole distraction fixation assembly includes a fixed distraction body and a movable distraction body, the fixed distraction body has a guide groove and a top screw, the guide arm is guided and limited by the guide groove, and under the action of the top screw, the toothed claws of the fixed distraction body and the movable distraction body are distracted.

[0004] The opening and closing of the fixed expansion body and the movable expansion body are achieved by telescopic adjustment of the guide arm. The adjustment of the guide arm requires the use of a wrench, which is inconvenient to operate during clinical use. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned deficiencies and to provide a bone hole rapid distraction and fixation device that is flexible and adjustable and has improved ease of use.

[0006] The present invention specifically adopts the following technical solutions:

[0007] A bone hole rapid distraction and fixing device comprises a main body, a knob, a cam wrench and a movable distraction body; a fixed distraction body is provided at the front end of the main body, an axial hole is provided inside, and a thread is provided at the end; the knob is installed at the end of the main body through the thread, and the knob is equipped with a push rod; the cam wrench comprises a cam part and a wrench part, and the cam part is installed in a main body slot at the rear section of the axial hole; the movable distraction body is connected with a push rod, and the push rod is installed at the front section of the axial hole, and the movable distraction body and the fixed distraction body are both provided with a distraction part, and the end section of the distraction part is provided with a toothed claw; the push rod, the cam part and the push rod are connected in sequence in the axial hole; when the knob is turned, the push rod pushes the cam part to move, and the cam part pushes the push rod to move and carry the movable distraction body to be initially distracted, and by pulling the wrench part, the cam part is driven to rotate from the lower dead center to the upper dead center, and then pushes the push rod to move a certain distance, so that the movable distraction body is further distracted.

[0008] Preferably, the push rod of the movable expansion body and the front section of the axial hole of the main body are non-circular cross-sections that match each other.

[0009] Preferably, the movable spreading body is provided with semicircular arms.

[0010] Preferably, the wrench portion comprises a first bending section, a straight rod section and a second bending section which are connected in sequence, and the two bending sections are bent in opposite directions, wherein the first bending section serves as a handle and the second bending section is connected to the cam portion.

[0011] Preferably, a shielding sleeve that can slide along the main body is sleeved on the outer periphery of the middle and rear section of the main body, and the shielding sleeve is located on the front side of the knob; an axial sleeve groove is provided on the shielding sleeve, which is opposite to the position of the groove of the main body, and the second bent section passes through the axial sleeve groove, and the camshaft of the cam part is fixed or hinged on the wall of the shielding sleeve.

[0012] Preferably, the length of the axial groove of the sleeve is matched with the second bending section. When the straight rod section of the wrench part is against the middle front section of the main body, the second bending section is inserted into the groove of the shaft sleeve, and the cam wrench can be self-locking and closed.

[0013] Preferably, a limiting groove is provided in the middle and rear section of the main body, in which the camshaft can move axially along the main body.

[0014] Preferably, the cam disc of the cam portion is rotatably connected to the camshaft, and the front end of the push rod is hinged to the camshaft; the front end of the push rod is provided with a notch, and the cam disc is located at the notch.

[0015] Preferably, a limiting portion for preventing the push rod from falling out is provided between the rear end of the push rod and the front end of the main body.

[0016] Preferably, the expansion portions are all stepped, including a horizontal surface and a vertical surface, the outer end of the horizontal surface is upwardly tilted, and the outer end surface of the vertical surface protrudes outwardly in an arc shape.

[0017] The present invention has the following beneficial effects:

[0018] When the device is used in surgery, after the toothed claw touches the wall of the bone hole, that is, when the knob is tightened to the maximum state, the wrench part of the cam wrench can be pulled to move the cam part (cam plate) from the lower dead center to the upper dead center, and the push rod is pushed to move a certain distance, so that the movable expansion body is further expanded and embedded in the inner wall of the bone hole to achieve firm fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structural principle of an embodiment of a bone hole rapid distraction and fixation device of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0021] Figure 3 for Figure 1 Schematic diagram of the cam wrench structure;

[0022] Figure 4 for Figure 1 A longitudinal cross-sectional view of

[0023] Figure 5 for Figure 1 A transverse cross-sectional view of

[0024] Figure 6 This is a schematic diagram of the overall structure of another embodiment of the bone hole rapid expansion and fixing device of the present invention;

[0025] Figure 7 for Figure 6 Schematic diagram of the decomposition.

[0026] Among them, 1 is the main body, 101 is the limiting groove, 102 is the main body slot, 2 is the knob, 3 is the cam wrench, 301 is the first bending section, 302 is the straight rod section, 303 is the second bending section, 4 is the movable expansion body, 5 is the fixed expansion body, 6 is the expansion part, 7 is the toothed claw, 8 is the axial hole, 9 is the thread, 10 is the push rod, 1001 is the notch, 11 is the cam part, 12 is the push rod, 13 is the shielding sleeve, 1301 is the axial groove of the sleeve, 14 is the semicircular arm, 15 is the horizontal surface, and 16 is the vertical surface. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] Example 1

[0029] like Figure 1-Figure 5 As shown, a bone hole rapid distraction and fixation device comprises a main body 1, a knob 2, a cam wrench 3 and a movable distraction body 4. A fixed distraction body 5 is provided at the front end of the main body 1, an axial hole is provided inside, and a thread is provided at the end. The knob 2 is installed at the end of the main body by thread, and a push rod 10 is connected to the knob 2. The cam wrench 3 comprises a cam portion and a wrench portion, and the cam portion 11 is installed in the main body slot 102 at the rear section of the axial hole. The movable distraction body 4 is connected with a push rod 12, and the push rod 12 is installed in the front section of the axial hole 8. Both the movable distraction body 4 and the fixed distraction body 5 are provided with a distraction portion 6, and the end section of the distraction portion 6 is provided with a toothed claw 7. The push rod 10, the cam portion 11, and the push rod 12 are connected in sequence in the axial hole, which means that the front end face of the push rod 10 is in contact with the rear side of the cam portion 11, and the front side of the cam portion 11 is in contact with the end end face of the push rod 12.

[0030] The push rod 12 of the movable expansion body 4 and the front section of the axial hole of the main body are non-circular cross-sections that match each other, which can prevent the push rod from rotating.

[0031] The movable expansion body 4 is provided with a semicircular arm 14, which can fully expose the bone hole to facilitate instrument operation.

[0032] The wrench portion comprises a first bending section 301, a straight rod section 302 and a second bending section 303 connected in sequence, wherein the two bending sections are bent in opposite directions, wherein the first bending section 301 serves as a handle, and the second bending section 303 is connected to the cam portion.

[0033] The shielding sleeve 13 that can slide along the main body is sleeved on the outer periphery of the middle and rear section of the main body 1, and the shielding sleeve 13 is located on the front side of the knob 2; the shielding sleeve 13 is provided with a sleeve axial groove 1301 that is directly opposite to the position of the groove of the main body, and the second bent section 303 penetrates into the sleeve axial groove, and the camshaft of the cam part is hinged on the shielding sleeve wall. When the shielding sleeve 13 is sleeved on the main body, the camshaft can enter the limiting groove 101 set in the middle and rear section of the main body 1, so that the camshaft can stably move along the axial direction of the main body in the limiting groove.

[0034] The length of the above-mentioned sleeve axial groove 1301 is adapted to the second bending section 303. When the straight rod section of the wrench part is against the middle and front section of the main body, the cam part is located a little past the top dead center, and the movable expansion body is in the maximum expansion position. At this time, the second bending section 302 is placed in the axial groove, and the cam wrench can be self-locking and closed.

[0035] A limiting portion for preventing the push rod from falling out is provided between the rear end of the push rod and the front end of the main body, thereby preventing the push rod from falling out of the axial hole.

[0036] The above-mentioned opening portions 6 are all stepped, including a transverse surface 15 and a vertical surface 16. The outer end of the transverse surface is upwardly tilted, and the outer end surface of the vertical surface protrudes outwardly in an arc shape.

[0037] According to the present invention, when the knob 2 is rotated, the knob carries the push rod forward during the process of screwing the knob in, and the push rod 10 moves against the cam portion 11, and the shielding sleeve follows, and then the cam portion 11 moves against the push rod to carry the movable expansion body to be initially expanded. When the knob is tightened to the maximum state, the wrench portion is pulled to drive the cam portion to rotate. During this process, the cam shaft rotates around the hinge point, so that the cam disk of the cam portion 11 rotates from the lower dead center to the upper dead center, and moves a certain distance against the push rod, so that the movable expansion body is further expanded, and the toothed claws of the expansion portion are embedded in the inner wall of the bone hole to achieve firm fixation.

[0038] Example 2

[0039] like Figure 6 and Figure 7A bone hole rapid distraction and fixation device comprises a main body 1, a knob 2, a cam wrench 3 and a movable distraction body 4. A fixed distraction body 5 is provided at the front end of the main body 1, an axial hole is provided inside, and a thread is provided at the end. The knob 2 is installed at the end of the main body by thread, and the end of the push rod 10 is plugged into the knob 2. The cam wrench 3 comprises a cam portion and a wrench portion, and the cam portion 11 is installed in the main body slot 102 at the rear section of the axial hole. The movable distraction body 4 is connected with a push rod 12, and the push rod 12 is installed in the front section of the axial hole 8. Both the movable distraction body 4 and the fixed distraction body 5 are provided with a distraction portion, and the end section of the distraction portion is provided with a toothed claw. The push rod 10, the cam portion 11, and the push rod 12 are connected in sequence in the axial hole, which means that the front end of the push rod 10 is hinged to the camshaft of the cam portion 1, and the front side of the cam portion 11 is in contact with the end end face of the push rod 12.

[0040] The wrench portion comprises a first bending section, a straight rod section and a second bending section which are connected in sequence. The two bending sections are bent in opposite directions. The first bending section serves as a handle, and the second bending section is connected to the cam portion.

[0041] The shielding sleeve 13 that can slide along the main body is sleeved on the outer periphery of the middle and rear section of the main body 1, and the shielding sleeve 13 is located on the front side of the knob 2; the shielding sleeve 13 is provided with a sleeve axial groove 1301 that is directly opposite to the position of the groove of the main body, and the second bent section 303 penetrates into the sleeve axial groove, and the camshaft of the cam part is fixed on the shielding sleeve wall. When the shielding sleeve 13 is sleeved on the main body, the camshaft can enter the limiting groove 101 set in the middle and rear section of the main body 1, so that the camshaft can stably move along the axial direction of the main body in the limiting groove.

[0042] The cam disc of the cam part is rotatably connected with the cam shaft, a notch is arranged at the front end of the push rod, two sides of the notch are hinged with the cam shaft, and the cam disc is located at the notch.

[0043] According to the present invention, when the knob 2 is turned, the knob carries the push rod forward during the process of screwing the knob in, and the push rod 10 moves against the cam portion 11, and the shielding sleeve follows, and then the cam portion 11 moves against the push rod to carry the movable expansion body to be initially expanded. When the knob is tightened to the maximum state, the wrench portion is turned to drive the cam disk to rotate. During this process, the cam shaft does not move, so that the cam disk rotates from the lower dead center to the upper dead center, and moves a certain distance against the push rod, so that the movable expansion body is further expanded, and the toothed claws of the expansion portion are embedded in the inner wall of the bone hole to achieve firm fixation.

[0044] The technical contents not described in this embodiment may be the same as those in Embodiment 1.

[0045] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A bone hole rapid expansion and fixing device, characterized in that: It includes a main body, a knob, a cam wrench and a movable expansion body; a fixed expansion body is provided at the front end of the main body, an axial hole is provided inside and a thread is provided at the end; the knob is installed at the end of the main body through the thread, and the knob is equipped with a push rod; the cam wrench includes a cam part and a wrench part, and the cam part is installed in the main body slot at the rear section of the axial hole; the movable expansion body is connected with a push rod, and the push rod is installed at the front section of the axial hole, and the movable expansion body and the fixed expansion body are both provided with an expansion part, and the end section of the expansion part is provided with a toothed claw; the push rod, the cam part and the push rod are connected in sequence in the axial hole; when the knob is turned, the push rod pushes the cam part to move, and the cam part pushes the push rod to move and carry the movable expansion body to be initially expanded, and by pulling the wrench part, the cam part is moved from the lower dead center to the upper dead center, and then moves a certain distance against the push rod, so that the movable expansion body is further expanded.

2. A bone hole rapid expansion and fixing device as claimed in claim 1, characterized in that: The push rod of the movable expansion body and the front section of the axial hole of the main body are mutually matched non-circular cross sections.

3. A bone hole rapid expansion and fixing device as claimed in claim 1, characterized in that: The movable spreading body is provided with a semicircular arm.

4. A bone hole rapid expansion and fixing device as claimed in claim 1, characterized in that: The wrench portion comprises a first bending section, a straight rod section and a second bending section which are connected in sequence, and the two bending sections are bent in opposite directions, wherein the first bending section serves as a handle and the second bending section is connected to the cam portion.

5. A bone hole rapid expansion and fixing device as claimed in claim 4, characterized in that: A shielding sleeve that can slide along the main body is sleeved on the outer periphery of the middle and rear section of the main body, and the shielding sleeve is located on the front side of the knob; an axial sleeve groove is provided on the shielding sleeve, which is opposite to the position of the groove of the main body, and the second bent section penetrates into the axial sleeve groove, and the camshaft of the cam part is fixed or hinged on the wall of the shielding sleeve.

6. A bone hole rapid expansion and fixing device as claimed in claim 5, characterized in that: The length of the sleeve axial groove is matched with the second bending section. When the straight rod section of the wrench part is close to the middle front section of the main body, the second bending section is placed in the sleeve axial groove, and the cam wrench can be self-locking and closed.

7. A bone hole rapid distraction and fixation device as claimed in claim 5, characterized in that: A limiting groove is arranged in the middle and rear section of the main body, in which the camshaft can move axially along the main body.

8. A bone hole rapid expansion and fixing device as claimed in claim 5, characterized in that: The cam disc of the cam part is rotatably connected with the camshaft, and the front end of the push rod is hinged with the camshaft; the front end of the push rod is provided with a notch, and the cam disc is located at the notch.

9. A bone hole rapid expansion and fixing device as claimed in claim 2, characterized in that: A limiting portion for preventing the push rod from falling out is arranged between the rear end of the push rod and the front end of the main body.

10. The bone hole rapid expansion and fixing device according to claim 1, characterized in that: The expanded parts are all stepped, including a horizontal surface and a vertical surface. The outer end of the horizontal surface is upwardly tilted, and the outer end surface of the vertical surface protrudes outwardly in an arc shape.

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