Bone traction needle

Abstract

The utility model discloses a bone traction needle, relates to the field of medicine, in particular to a surgical instrument, and solves the problems that an existing bone traction needle needs to be used in cooperation with a traction bow and is inconvenient to operate and sterilize. According to the technical scheme, the bone traction needle comprises a needle body and two traction devices fixed to the two ends of the needle body, each traction device comprises a sleeve, a puller bolt and a traction piece, the sleeves are arranged outside the needle body in a penetrating mode, the sleeves are provided with threaded holes, the puller bolts are arranged in the threaded holes, one ends of the puller bolts are matched with the needle body in an abutting mode, and the other ends of the puller bolts are matched with the traction pieces. And the sleeve or the puller bolt is provided with a traction piece. The two sets of traction devices are mutually independent, the two sets of traction devices do not influence each other when the needle body is penetrated, installed and fixed, the positions of the traction devices on the needle body can be freely adjusted according to needs, and therefore operation is more convenient. And the traction device is small in size, so that the miniaturization of the structure is realized, and the sterilization is more convenient. The traction device is used for rehabilitation therapy for applying traction force to the human body.

Description

Technical Field

[0001] The utility model relates to the field of medicine, in particular to a surgical instrument, specifically a bone traction needle. Background Art

[0002] Traction is a treatment method in orthopedics. Clinically, traction force is applied to the human body through a bone traction needle, which can relieve muscle tension and strong contraction, reduce the pain caused by abnormal movement of the fracture end, reduce fracture and dislocation, and prevent and treat soft tissue contracture. The existing bone traction needle needs to be used in cooperation with a traction bow. The traction bow is in a U shape as a whole. The middle part of the traction bow is bent to form a traction ring. The two ends of the traction bow are respectively fixedly connected with a sleeve. Each sleeve is provided with a tightening bolt, and the central lines of the two sleeves coincide. When in use, a drill bit is installed on a bone drill to drill a hole in the affected area or directly install the bone traction needle on the bone drill to drill a hole. After the bone traction needle penetrates through the bone mass, first, the two ends of the bone traction needle are successively inserted into the two sleeves, then the positions of the two sleeves are adjusted, and the sleeves are fixed to the bone traction needle through the tightening bolts. Finally, the traction force application system is connected to the traction ring in the middle of the traction bow, and then traction force can be applied to the human body through the bone traction needle.

[0003] From the perspective of the operation process, the traction bow has a certain shape, and the distance between the two sleeves is relatively fixed. In addition, since the distance between the two sleeves at the two ends of the traction bow is smaller than the length of the bone traction needle, the bone traction needle must be successively inserted into the sleeves, and the whole operation is relatively cumbersome. Often, the distance between the two sleeves needs to be increased by deforming the traction bow to insert the bone traction needle into the second sleeve. However, the bone traction needle is straight, and only when the central lines of the two sleeves at the two ends of the traction bow coincide can the bone traction needle be easily inserted into the sleeves and the operation interference to the human body can be reduced. After the two sleeves at the two ends of the traction bow are relatively far apart, the central lines of the two sleeves often do not coincide, which affects the smooth insertion of the bone traction needle into the sleeves. It can be seen that the existing bone traction device has the problem of inconvenient operation.

[0004] From the perspective of force, the traction bow is made of metal and has a fixed shape, so the distance between the two sleeves is also relatively fixed. After the sleeve and the bone traction are fixed through the tightening bolt, the fixed position of the sleeve on the bone traction needle cannot be adjusted within the allowable range, so that the distance between the two sleeves can be made as small as possible. In order to facilitate the insertion of the two ends of the bone traction needle into the sleeves, the distance between the two ends of the traction bow is often much larger than the minimum value within the allowable range, that is, the distance between one sleeve and the needle insertion site and the distance between the other sleeve and the needle exit site are both large. The bone traction needle mainly bears bending moment. Since the distance between the sleeve and the needle insertion site and the distance between the sleeve and the needle exit site are both large, a bone traction needle with a larger diameter is required to meet the strength requirements, which is not conducive to the miniaturization of the bone traction needle.

[0005] In terms of the sterilization method, the traction bow has a relatively large size, which makes it inconvenient to sterilize. The sterilization problem is reflected in two aspects. On the one hand, it is the sterilization of the traction bow before use, and on the other hand, it is the sterilization of the traction bow during use.

[0006] In terms of safety, one end of the bone traction needle is a pointed cone end and is exposed outside the patient's body, which is prone to stabbing, damaging the patient's body, and also easily catching on clothes and quilts. Under the action of forces outside the traction force application system, the bone traction needle may also displace along its axis direction, affecting the treatment process. Utility Model Content

[0007] The present utility model provides a bone traction needle to solve the problems that the existing bone traction needle needs to be used in cooperation with a traction bow and is inconvenient to operate and sterilize.

[0008] The technical solution adopted by the present utility model is: a bone traction needle, including a needle body and two sets of traction devices fixed at both ends of the needle body. The traction device includes a sleeve, a tightening bolt, and a traction member. The sleeve is sleeved outside the needle body. The sleeve is provided with a threaded hole penetrating through its tube wall. An adapted tightening bolt is provided in the threaded hole. One end of the tightening bolt located inside the threaded hole is in tight fit with the needle body. The sleeve or the tightening bolt is provided with a traction member.

[0009] The traction member is used to be connected with the traction force application system so that the needle body can apply a traction force to the human body. Therefore, the traction member only needs to be able to transmit force. Further: the traction member is fixedly installed on the sleeve or the tightening bolt, or the traction member is movably installed on the sleeve or the tightening bolt.

[0010] Provide a traction member with a simplified structure. Specifically: the traction member is a traction ring or a traction hook.

[0011] The traction member is installed on the tightening bolt, and the traction member can also be used to rotate and adjust the tightening bolt. Specifically: the tightening bolt includes a head and a screw rod. A prismatic rotation adjustment section is provided in the middle of the screw rod. The traction member is provided with a through hole adapted to the rotation adjustment section. The screw rod of the tightening bolt passes through the through hole of the traction member; in a cross-section perpendicular to the center line of the tightening bolt, the outer contour of the rotation adjustment section is a polygon, and the diameter of the inscribed circle of the polygon is greater than the diameter of the screw rod, and the diameter of the circumscribed circle of the polygon is less than the diameter of the head of the tightening bolt.

[0012] In order for the bone traction needle to be used as a drill bit, further: one end of the needle body is a pointed cone end, and the pointed cone end is provided with a drill bit structure.

[0013] In order to improve the stability of the sleeve and the needle body fixed by the tightening bolt, further: the threaded hole is located in the middle of the sleeve in the center line direction, and the center line of the threaded hole is perpendicular to the center line of the sleeve.

[0014] The pointed end of the bone traction needle is prone to causing stabbing injuries. To avoid this problem, further improvements are as follows: One end of the needle body is a pointed end, and a protective sleeve is also sleeved outside the pointed end.

[0015] To improve the stability of the protective sleeve, further improvements are as follows: The inner wall of the protective sleeve is provided with anti-slip lines.

[0016] To better fix the needle body in the bone mass and prevent the needle body from loosening and slipping out, further improvements are as follows: The surface of the middle part of the needle body is provided with anti-slip lines. For example, the anti-slip lines are threads, and the major diameter of the threads is greater than the diameter of the needle body, and the minor diameter of the threads is less than the diameter of the needle body.

[0017] The beneficial effects of the present utility model are as follows: The two traction devices of the bone traction needle are independent of each other. The penetration and installation and fixation of the two traction devices on the needle body do not affect each other, and the positions of the traction devices on the needle body can be freely adjusted as needed. Therefore, the operation is more convenient. Compared with the existing traction bow, the size of the traction device is smaller, realizing the miniaturization of the structure. Therefore, sterilization is also more convenient. The traction member is used to connect with the traction force application system, and the pulling of the two traction devices by the traction force application system does not affect each other. Therefore, the distance between the traction device and the human body can be smaller, which is beneficial to the miniaturization of the needle body. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the bone traction needle of the present utility model.

[0019] Figure 2 is Figure 1 a structural schematic diagram of the shown embodiment in the plane corresponding to the central axis of the needle body and the central axis of the tightening bolt.

[0020] Figure 3 is Figure 1 a three-dimensional structural schematic diagram of the needle body in the shown embodiment.

[0021] Figure 4 is Figure 1 a three-dimensional structural schematic diagram of the tightening bolt in the shown embodiment.

[0022] Figure 5 is Figure 1 a three-dimensional structural schematic diagram of the traction member in the shown embodiment.

[0023] Reference numerals: Needle body 1, sleeve 2, tightening bolt 3, head 31, screw 32, rotation adjustment section 321, traction member 4, through hole 41, protective sleeve 5. Detailed Description of the Embodiment

[0024] The following further describes the present utility model with reference to the drawings.

[0025] See Figure 1 andFigure 2 , the bone traction needle of the present utility model includes a needle body 1 and two sets of traction devices fixed at both ends of the needle body 1. The needle body 1 is used to penetrate the bone mass and directly apply a traction force to the human body. In order to facilitate the penetration of the needle body 1 into the bone mass, one end of the needle body 1 is a tapered end. Before the needle body 1 penetrates the bone mass, a drill bit and a bone drill can be used to drill a hole in the affected area, or the needle body 1 can be used as a drill bit. Therefore, the tapered end of the needle body 1 can have a smooth surface structure, or the tapered end of the needle body 1 can also be provided with a drill bit structure. For example, see Figure 3 . To avoid stabbing caused by the tapered end of the bone traction needle, a protective sleeve 5 is also provided on the outer side of the tapered end of the needle body 1. The tapered end of the needle body 1 can be shielded by the protective sleeve 5 both before and during use. To prevent the protective sleeve 5 from slipping off the tapered end of the needle body 1 and improve the stability of the protective sleeve 5, anti-slip lines are provided on the inner wall of the protective sleeve 5. For example, when the tapered end of the needle body 1 is provided with a drill bit structure, the inner wall of the protective sleeve 5 is provided with thread-shaped anti-slip lines. To better fix the needle body 1 in the bone mass and prevent the needle body 1 from loosening and slipping out, that is, to improve the stability of the needle body 1 in its axial direction, anti-slip lines are provided on the surface of the middle part of the needle body 1. For example, the anti-slip lines are threads, and the major diameter of the thread is greater than the diameter of the needle body 1, and the minor diameter of the thread is less than the diameter of the needle body 1, so that the thread can effectively fix with the bone mass and will not significantly increase the difficulty of the needle body 1 penetrating the bone mass.

[0026] The two sets of traction devices are used to be fixed at both ends of the needle body 1 and are respectively connected to a traction force application system. By means of the traction force application system, a balanced force is applied to the needle body 1, and then a traction force is applied to the human body through the needle body 1. The traction device includes a sleeve 2, a tightening bolt 3 and a traction member 4. The sleeve 2 has a tube hole adapted to the outer diameter of the needle body 1. The sleeve 2 is sleeved outside the needle body 1, that is, the needle body 1 penetrates through the tube hole of the sleeve 2. There can be a clearance fit between the inner wall of the sleeve 2 and the outer surface of the needle body 1 to facilitate the adjustment of the position of the sleeve 2. A damping member can also be provided on the inner wall of the sleeve 2 to increase the friction coefficient between the sleeve 2 and the needle body 1. The sleeve 2 is provided with a threaded hole penetrating its tube wall, that is, the threaded hole communicates with the tube hole of the sleeve 2. A suitable tightening bolt 3 is provided in the threaded hole. One end of the tightening bolt 3 located inside the threaded hole is in tight fit with the needle body 1. By rotating the tightening bolt 3, the tightening bolt 3 can be in tight contact with the needle body 1 or not in contact with the needle body 1. The threaded hole is located at any position in the center line direction of the sleeve 2. To improve the stability of the sleeve 2 and the needle body 1 fixed by the tightening bolt 3, the threaded hole is preferably located in the middle of the center line direction of the sleeve 2.

[0027] The sleeve 2 or the tightening bolt 3 is also provided with a traction member 4, and the traction members 4 of the two sets of traction devices are independent of each other. The traction member 4 is used to connect with the traction force application system and transmit the acting force of the traction force application system to the needle body 1, so that the needle body 1 can apply a traction force to the human body. The shape and structure of the traction member 4 can be various, as long as it is convenient to connect with the traction force application system and can transmit force. For example, the traction member 4 is a traction ring or a traction hook. In Figure 1 , Figure 2 and Figure 5 In the illustrated embodiment, the traction member 4 is a traction ring. The traction member 4 can be fixedly installed on the sleeve 2 or the tightening bolt 3, or can be movably installed on the sleeve 2 or the tightening bolt 3. When the traction member 4 is installed on the sleeve 2, the tightening bolt 3 is not affected by the traction force, which can improve the fixing effect between the needle body 1 and the sleeve 2. Since the tightening bolt 3 has a good fixing effect and the traction force is small, generally it is not enough to affect the stability between the needle body 1 and the sleeve 2, so the traction member 4 can also be installed on the tightening bolt 3. When the traction member 4 is installed on the tightening bolt 3, it is preferably installed on the head of the tightening bolt 3 to avoid the traction member 4 affecting the rotation and adjustment of the tightening bolt 3. The center line of the threaded hole is preferably perpendicular to the center line of the sleeve 2, that is, the screw rod of the tightening bolt 3 is perpendicular to the needle body 1, to avoid the traction force causing the traction device to displace along the axial direction of the needle body 1. The traction member 4 can be fixedly installed on the tightening bolt 3. At this time, the traction member 4 can also be used as an auxiliary structure for rotating and adjusting the tightening bolt 3, which is convenient for manually adjusting the tightening bolt 3.

[0028] The following provides a solution in which the traction member 4 is movably installed on the tightening bolt 3 and the tightening bolt 3 can be rotated and adjusted by means of the traction member 4. Refer to Figure 2 , Figure 4 and Figure 5, the tightening bolt 3 includes a head 31 and a screw 32. The head 31 and the screw 32 are an integral body or fixed by welding. A prismatic rotation adjustment section 321 is provided in the middle of the screw 32. By clamping and rotating the rotation adjustment section 321, the rotation of the tightening bolt 3 is realized; the traction member 4 is provided with a through hole 41 adapted to the rotation adjustment section 321, and the screw 32 of the tightening bolt 3 passes through the through hole 41 of the traction member 4. In a cross-section perpendicular to the center line of the tightening bolt 3, the outer contour of the rotation adjustment section 321 is a polygon, and the diameter of the inscribed circle of the polygon is greater than the diameter of the screw 32, and the diameter of the circumscribed circle of the polygon is less than the diameter of the head 31 of the tightening bolt 3. For example, the rotation adjustment section 321 is in the shape of a regular hexagonal prism, and the center line of the regular hexagonal prism coincides with the center line of the screw 32. Move the traction member 4 to make the rotation adjustment section 321 enter the through hole 41, and rotate the traction member 4 to adjust the tightening bolt 3, so that the tightening bolt 3 can be tightened against the needle body 1, or the tightening bolt 3 can be separated from the needle body 1 without contact. Move the traction member 4 in the direction of the head 31 of the tightening bolt 3, the rotation adjustment section 321 disengages from the through hole 41, and the head 31 of the tightening bolt 3 is limited to transmit the traction force.

Claims

1. Bone traction needle, characterized in that: The invention comprises a needle body (1) and two sets of traction devices fixed at both ends of the needle body (1), wherein the traction devices comprise a sleeve (2), a tightening bolt (3) and a traction piece (4); the sleeve (2) is inserted outside the needle body (1); the sleeve (2) is provided with a threaded hole penetrating through its tube wall; an adapted tightening bolt (3) is provided in the threaded hole; one end of the tightening bolt (3) located inside the threaded hole is tightly matched with the needle body (1); the sleeve (2) or the tightening bolt (3) is provided with a traction piece (4).

2. The bone traction needle according to claim 1, characterized in that: The traction member (4) is fixedly mounted on the sleeve (2) or the tightening bolt (3), or the traction member (4) is movably mounted on the sleeve (2) or the tightening bolt (3).

3. The bone traction needle according to claim 2, characterized in that: The traction member (4) is a traction ring or a traction hook.

4. The bone traction needle according to claim 1, characterized in that: The tensioning bolt (3) comprises a head (31) and a screw rod (32); a prism-shaped rotation adjustment section (321) is provided in the middle of the screw rod (32); a through hole (41) adapted to the rotation adjustment section (321) is provided in the traction member (4); the screw rod (32) of the tensioning bolt (3) passes through the through hole (41) of the traction member (4); in a cross section perpendicular to the center line of the tensioning bolt (3), the outer contour of the rotation adjustment section (321) is a polygon, and the diameter of the inscribed circle of the polygon is greater than the diameter of the screw rod (32), and the diameter of the circumscribed circle of the polygon is smaller than the diameter of the head (31) of the tensioning bolt (3).

5. The bone traction needle according to claim 1, characterized in that: One end of the needle body (1) is a pointed cone end, and a drill structure is provided on the pointed cone end.

6. The bone traction needle according to claim 1, characterized in that: The threaded hole is located in the middle of the center line direction of the sleeve (2), and the center line of the threaded hole is perpendicular to the center line of the sleeve (2).

7. The bone traction needle according to any one of claims 1 to 6, characterized in that: One end of the needle body (1) is a pointed cone end, and a protective cover (5) is sheathed on the outer side of the pointed cone end.

8. The bone traction needle according to claim 7, characterized in that: The inner wall of the protective cover (5) is provided with anti-slip grooves.

9. The bone traction needle according to any one of claims 1 to 6, characterized in that: The surface of the middle part of the needle body (1) is provided with anti-slip grooves.

10. The bone traction needle according to claim 9, characterized in that: The anti-slip pattern is a thread, and the major diameter of the thread is greater than the diameter of the needle body (1), and the minor diameter of the thread is smaller than the diameter of the needle body (1).

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