Lag Screw Socket Assembly and Aiming Module

Abstract

The present invention relates to a lag screw sleeve assembly and an aiming module for implanting a lag screw during intramedullary nail implantation surgery. The lag screw sleeve assembly includes an adjustment nut and a lag screw sleeve. The outer surface of the adjustment nut body is provided with a recessed portion for mating with the aiming module. The lag screw sleeve assembly also includes a sliding sleeve disposed between the adjustment nut and the lag screw sleeve. When the adjustment nut rotates, the end face of the adjustment nut and the end face of the end of the sliding sleeve remain unchanged. The aiming module has a guide hole and an axial stopper that mates with the lag screw sleeve. When the adjustment nut is located in the guide hole, the axial stopper engages with the recessed portion of the adjustment nut, thereby limiting the axial movement of the adjustment nut. Thus, the present invention simultaneously enables the lag screw sleeve to abut against the outer cortex of the femoral neck and accurately selects the specifications of the lag screw.

Description

Technical Field

[0001] The present invention belongs to the field of medical instruments and relates to a surgical instrument for treating femoral fractures, and more particularly to a lag screw sleeve assembly and an aiming module. Background Art

[0002] When treating fractures, it is common to fix the broken bones by implanting an intramedullary nail. Depending on the location of the connection, intramedullary nails can be divided into femoral intramedullary nails and tibial intramedullary nails. Among them, femoral intramedullary nails are particularly suitable for femoral fractures, including femoral shaft fractures and intertrochanteric fractures. When using femoral intramedullary nails to treat femoral fractures, implantation instruments or aiming instruments are often required to assist in the implantation of intramedullary nails. They help implant the main nail of the intramedullary nail and aim and implant the locking nail used for the main nail. In addition, tension screws are also used as auxiliary nails during surgery.

[0003] During intramedullary nailing surgeries using lag screws, a lag screw sleeve is typically used in conjunction with an aiming device to assist with aiming and guidance. The lag screw sleeve is typically connected to the aiming device using either threads or a slot. If a threaded connection is used, the sleeve can be adjusted to provide fixed support for the outer cortex of the femoral neck. However, since the sleeve shifts with thread movement, it is impossible to accurately measure the specifications of the lag screw, which is in a fixed position relative to the main intramedullary nail. If a slot connection is used, the specifications of the lag screw, which is in a fixed position relative to the main intramedullary nail, can be accurately measured, but it cannot provide effective fixed support for the outer cortex of the femoral neck. Summary of the Invention

[0004] In order to solve the above technical problems to a certain extent, the present invention proposes the following technical solutions.

[0005] A tension screw sleeve assembly is used for use in conjunction with an aiming module to implant a tension screw during an intramedullary nail implantation operation. The tension screw sleeve assembly includes an adjusting nut and a tension screw sleeve. The adjusting nut has a hollow body and an internal thread on a portion of its inner surface. The tension screw sleeve has a hollow body and an external thread engaged with the internal thread on a portion of its outer surface. A recess is provided on the outer surface of the body of the adjusting nut for cooperating with the aiming module. The tension screw sleeve assembly also includes a sliding sleeve arranged between the adjusting nut and the tension screw sleeve. When the adjusting nut rotates, the end face of the adjusting nut and the end face of the end of the sliding sleeve remain unchanged.

[0006] According to an improvement of the present invention, a guide hole for allowing the tension screw to pass through and a guide hole for allowing the pressure screw to pass through are provided inside the tension screw sleeve.

[0007] According to an improvement of the present invention, the outer surface of the tension screw sleeve is a combination of a plane and a cylindrical surface.

[0008] According to an improvement of the present invention, when the end of the sliding sleeve abuts against a corresponding portion of the adjusting nut, an outer end surface of the end of the sliding sleeve is flush with a corresponding outer end surface of the adjusting nut.

[0009] According to an improvement of the present invention, an elastic member is further included, and the sliding sleeve has a first stop portion, the tension screw sleeve has a second stop portion, and the elastic member is stopped by the first stop portion and the second stop portion.

[0010] According to an improvement of the present invention, the sliding sleeve is provided with an axially extending hole, and the tension screw sleeve is provided with a guide portion, and the guide portion is accommodated in the hole.

[0011] According to a refinement of the present invention, the guide portion is a pin.

[0012] According to an improvement of the present invention, the sliding sleeve has a telescopic structure or a removable structure so that the end surface of the adjusting nut and the end surface of the end portion of the sliding sleeve remain unchanged.

[0013] In addition, the present invention also proposes an aiming module for use in conjunction with the tension screw sleeve assembly described in the present invention. The aiming module has a guide hole and an axial limiter that cooperate with the tension screw sleeve, and when the adjusting nut is located in the guide hole, the axial limiter engages with the recessed portion of the adjusting nut, thereby limiting the axial movement of the adjusting nut.

[0014] According to an improvement of the present invention, the axial limiting member has a button and an elastic member. The button can rotate around a fixed axis, and one end of the button abuts against the elastic member.

[0015] From the above, it can be seen that according to the solution of the present invention, the tension screw sleeve can be pressed against the outer cortex of the femoral neck during the operation, thereby avoiding additional damage to the patient when the tension screw is implanted during the operation, and the tension screw sleeve assembly also includes a sliding sleeve arranged between the adjusting nut and the tension screw sleeve. Since the end face of the adjusting nut and the end face of the sliding sleeve remain unchanged when the adjusting nut rotates, it is possible to use a measuring tool to accurately select the required specifications of the tension screw in combination with the length of the guide wire.

[0016] Other features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0018] Figure 1 The present invention is a schematic diagram of the exploded state of the lag screw sleeve assembly and the intramedullary nail aimer used in conjunction with the assembly.

[0019] Figure 2 The present invention is a schematic diagram of the assembly state of the lag screw sleeve assembly and the intramedullary nail aimer used in conjunction with the assembly.

[0020] Figure 3 It is an exploded view of the lag screw sleeve assembly of the present invention.

[0021] Figure 4 It is a cross-sectional view of the lag screw sleeve assembly of the present invention.

[0022] Figure 5 It is a perspective view of the lag screw sleeve assembly of the present invention.

[0023] Figure 6 It is a schematic diagram of the lag screw sleeve of the present invention in use.

[0024] Figure 7 yes Figure 6 A partial view of the portion of the lag screw sleeve containing the adjusting nut.

[0025] All drawings are only schematic and are not necessarily drawn to scale. In addition, they only show those parts necessary for explaining the present invention, and other parts are omitted or only mentioned. That is, in addition to the parts shown in the drawings, the present invention may also include other parts. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0027] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth to enable those skilled in the art to more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented without some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, it is contemplated that the present invention may be implemented with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are intended for illustrative purposes only and should not be considered as features or limitations of the claims unless expressly set forth in the claims.

[0028] Descriptions of directions that may be used in the following description, such as "proximal / proximal end", "distal / distal end", "inside", "outside", "longitudinal", etc., unless otherwise specified, are for the convenience of description only and are not intended to form any limitation on the technical solution of the invention. It should be noted that, in this article, the insertion end of the intramedullary nail is the distal end, and the end opposite to the insertion end, that is, the end connected to the handle, is the proximal end. The direction from the proximal end to the distal end of the intramedullary nail is the distal direction, and the opposite is the proximal direction. "Distal end / distal side" used in this article generally refers to an end / side that is closer to the distal direction relative to the other end / side, and "proximal / proximal end" generally refers to an end / side that is closer to the proximal direction relative to the other end / side; "longitudinal" refers to the direction extending between the proximal and distal ends of the intramedullary nail.

[0029] In the following description, references to directions, such as "upper," "lower," "inner," "outer," "radial," and "axial," are used for convenience only and are not intended to limit the technical solutions of the invention unless otherwise expressly stated. Furthermore, when terms such as "first" and "second" are used to describe elements of the present application, these terms are used solely to distinguish between the elements and are not intended to limit the nature, sequence, order, or number of these elements.

[0030] Figure 1 This is a schematic diagram of the exploded state of the lag screw sleeve assembly and the intramedullary nail aiming device kit used in conjunction with it. Figure 1 In the embodiment, the tension screw sleeve assembly B is located on the right side, and the intramedullary nail aimer A used in conjunction with the tension screw sleeve assembly B is located on the left side. Specifically, the intramedullary nail aimer A includes a handle A1 and an aiming module A2. The handle A1 is arranged at its first end ( Figure 1 The left end of the Figure 1 The handle A1 is connected to the right end of the handle (not shown in the figure), and is connected to an intramedullary nail (not shown) at the first end and an aiming module A2 at the second end, allowing the aiming module to be used to aim the nail during intramedullary nailing surgery. The handle A1 and aiming module A2 are connected by a detachable connection structure. The intramedullary nail is provided with holes for receiving head and neck nails, such as lag screws or compression screws.

[0031] The aiming module A2 has a first end and a second end. The first end is connected to the second end of the handle A1, and the second end is provided with a button A21 and a guide hole A22 for cooperating with the tension screw sleeve assembly B.

[0032] Figure 2 This is a schematic diagram of the assembly state of the lag screw sleeve assembly of the present invention and the intramedullary nail aimer used therewith. At this time, a portion of the lag screw sleeve assembly B is accommodated in the guide hole A22. Further, combined with Figure 3The button A21 of the aiming module A2 is engaged in the groove 102 on the adjusting nut 100 of the tension screw sleeve assembly B. Figure 3 An annular groove 102 is shown in the figure, and of course those skilled in the art may also adopt any other recessed portion that can engage with the button A21.

[0033] In a specific embodiment, the button A21 has a first end and a second end and is rotatable about a fixed axis located between the first and second ends. One of the first and second ends is subject to the elastic force of an elastic member, such as a coil spring. During the mating process between the tension screw sleeve assembly and the aiming module A2, as the end of the button A21 not engaged with the elastic member comes into contact with the adjustment nut 100, pressure from the adjustment nut 100 of the tension screw sleeve assembly B causes the button A21 to overcome the elastic force of the elastic member and rotate about the fixed axis. When the adjustment nut 100 continues to move until it reaches the groove 102, the elastic member forces the button A21 to rotate about the fixed axis, with one end engaging the groove 102. To remove the adjustment nut 100 from the aiming module A2, the user presses the button A21 to overcome the elastic force of the elastic member, freeing the other end of the button A21 from the groove 102, and then removes the adjustment nut 100. Preferably, a tapered portion is provided on one end of the adjustment nut 100 to facilitate installation.

[0034] The button A21 serves as an axial retaining member for the adjustment nut 100, thereby maintaining the adjustment nut 100 in an axially fixed position relative to the aiming module A2. Although a specific structure is described herein, those skilled in the art will appreciate that, in addition to the button structure described herein, other axial retaining member combinations known in the art are also feasible.

[0035] Figure 3 This is an exploded view of the tension screw sleeve assembly of the present invention. The tension screw sleeve assembly includes an adjustment nut 100. The main body of the adjustment nut 100 is a hollow cylindrical structure. The interior of the cylindrical structure is provided with internal threads for threaded connection with the external threads 201 on the main body of the tension screw sleeve 200. The exterior of the cylindrical structure is provided with the aforementioned groove 102 to facilitate engagement with the button A21 of the aiming module A2. An operating portion 101 is provided at one end of the cylindrical structure for user operation to rotate the adjustment nut 100. Preferably, the operating portion 101 is also provided with multiple holes to facilitate insertion of a rod-shaped portion for use as a wrench, thereby more conveniently rotating the adjustment nut 100.

[0036] The lag screw sleeve assembly further includes a lag screw sleeve 200 . The lag screw sleeve 200 includes a hollow body, a portion of which is provided with an external thread 201 for mating with the internal thread of the adjusting nut 100 .

[0037] from Figure 3 It can also be seen that the outer surface of the lag screw sleeve 200 is not a completely cylindrical surface, but is provided with two parallel flat surfaces. These two flat surfaces engage with corresponding flat surfaces in the guide hole A22 of the aiming module A2, thereby preventing the lag screw sleeve 200 from rotating. In this way, when the adjusting nut 100 is rotated, the lag screw sleeve 200 can move along its axial direction through the threaded engagement.

[0038] Thus, during surgery, after the lag screw sleeve assembly B and the intramedullary nail aimer A are assembled, the lag screw sleeve 200 can be moved axially by operating the adjustment nut 100 until it abuts the outer cortex of the patient's femoral neck. Because the adjustment nut 100 itself is axially retained by the button A21, the axial position of the adjustment nut 100 itself remains unchanged, and the axial position of the end face of its operating portion 101 also remains unchanged, thereby determining the required lag screw specifications.

[0039] Furthermore, as a preferred embodiment, a hole for passing the tension screw and a hole for passing the compression screw are provided inside the tension screw sleeve 200 .

[0040] As a further improvement of the present invention, see Figure 3 A sliding sleeve 300 is further provided at one end of the tension screw sleeve 200. The sliding sleeve 300 has a cylindrical body, and an end portion 301 for cooperating with the operating portion 101 of the adjusting nut 100 is provided at one end of the body. Figure 4 It can also be seen that a step is provided on the inner surface of the operating portion 101, which is capable of abutting against the end 301 of the sliding sleeve 300. When the sliding sleeve 300 is installed in the adjusting nut 100 and the step abuts against the end 301 of the sliding sleeve 300, the outer end surface of the end 301 is axially flush with the outer end surface of the operating portion 101 of the adjusting nut 100.

[0041] At one end of the sleeve 300 away from the end portion 301, a first annular stopper 302 is provided. Figure 3 FIG3 shows the axial position of the first stop portion 302 on the tension screw sleeve 200 after the sleeve 300 and the tension screw sleeve 200 are assembled. The first stop portion 302 serves as a stop for one end of the elastic member 400. The elastic member 400 can be in the form of a coil spring, for example. Accordingly, a second stop portion 202 is provided at one end of the main body of the tension screw sleeve 200. The outer diameter of the second stop portion 202 is larger than the outer diameter of other parts of the main body. The second stop portion 202 serves as a stop for the other end of the elastic member 400. After the sleeve 300 is set on the tension screw sleeve 200, the first stop portion 302 is fixedly connected to the sleeve 300 (for example, by welding or the like).

[0042] Furthermore, the body of the sliding sleeve 300 is provided with an axially extending slot 303 for the guide portion 203 provided on the lag screw sleeve 200 to move within and prevent the sliding sleeve from moving. For example, the guide portion is in the form of a pin. The pin is inserted into a hole in the first stop portion 202 and is capable of axially moving within the slot 303 of the sliding sleeve 300 as the lag screw sleeve moves axially.

[0043] The distance between the first stop portion 302 and the second stop portion 202 and the parameters of the elastic member 400 are selected so that when the adjusting nut 100, the tension screw sleeve 200 and the sliding sleeve 300 are assembled, under the action of the elastic member 400, the end surface of the end portion 301 always remains flush with the end surface of the operating portion 101 of the adjusting nut 100 in the axial direction. Figure 4 、 Figure 5 shown.

[0044] Therefore, when the adjusting nut 100 rotates, although the tension screw sleeve 200 will move axially, due to the elastic force exerted by the second stop portion 202 thereon on the elastic member 400, the elastic member 400 further exerts a force on the first stop portion 302, so that the outer end face of the end portion 301 of the sleeve 300 remains flush with the outer end face of the operating portion 101 of the adjusting nut 100 in the axial direction, and also avoids the sleeve from accidentally falling out of the adjusting nut.

[0045] A lag screw guide hole and a compression screw guide hole are provided in the lag screw sleeve, wherein the lag screw guide hole and the compression screw guide hole intersect in the lag screw sleeve so that when both the lag screw and the compression screw are implanted, the lag screw and the compression screw are partially engaged. Figure 5 As shown, in order to guide the lag screw and the compression screw into the lag screw guide hole and the compression screw guide hole, an entry hole for the lag screw and the compression screw to pass through is also provided on the sliding sleeve.

[0046] Figure 6 This is a schematic diagram of the lag screw sleeve of the present invention in use. In addition to the intramedullary nail aimer A and the lag screw sleeve assembly B, it also shows a measuring assembly C and a guide needle assembly D. The measuring assembly C primarily includes a measuring ruler, while the guide needle assembly D primarily includes a guide needle and may also include a guide needle sleeve. One end of the measuring ruler is provided with a scale, and the middle portion of the measuring ruler is provided with a cavity for accommodating the guide needle. During use, the other end of the measuring ruler rests against the lag screw sleeve assembly B, and the length of the portion of the guide needle located outside the lag screw sleeve can be measured based on the scale thereon.

[0047] Figure 7 yes Figure 6A partial view of the portion of the lag screw sleeve containing the adjusting nut. Figure 7 As can be seen in the figure, since the adjusting nut 100 has rotated a certain angle, the lag screw sleeve has moved a certain distance along its axial direction. Accordingly, the elastic member 400 is compressed, driving the sliding sleeve 300 to move. When the end of the lag screw sleeve abuts the patient's outer cortex, the adjusting nut 100 is stopped. At this point, the length of the guide wire outside the lag screw sleeve can be measured with a ruler to determine the required lag screw specifications.

[0048] Therefore, during the operation, by setting the sliding sleeve 300, and the outer end surface of the end 301 of the sliding sleeve 300 is flush with the outer end surface of the operating part 101 of the adjusting nut 100 in the axial direction, the outer end surface of the sliding sleeve 300 can be used as a reference surface for measurement, so that the length of the guide needle located outside the tension screw sleeve assembly can be measured more accurately, thereby ensuring the accuracy of the specifications of the tension screw.

[0049] Although the elastic member 400 is used in the above-described embodiment to ensure that the outer end surface of the end portion 301 of the sliding sleeve 300 is axially flush with the outer end surface of the operating portion 101 of the adjusting nut 100, other feasible methods can also be used to achieve this function. For example, the sliding sleeve 300 can be configured as a telescopic structure, preferably with damping, or as a partially removable structure, as long as the outer end surface of the end portion 301 is axially flush with the outer end surface of the operating portion 101 of the adjusting nut 100.

[0050] The structure of the present invention has been described in detail above. Those skilled in the art will appreciate that many of the details described are merely exemplary and non-restrictive. In other words, the specific shape, structure, and other features described above are not necessarily required to be adopted as long as the corresponding functions are achieved.

[0051] The present invention has been clearly and completely described with reference to the above exemplary embodiments. It should be understood by those skilled in the art that various other embodiments may be envisioned by modifying the disclosed technical solutions without departing from the spirit and scope of the present invention. These embodiments should be understood to fall within the scope of the present invention as determined by the claims and any equivalent technical solutions thereof.

Claims

1. A lag screw sleeve assembly, for use in conjunction with an aiming module during intramedullary nail implantation surgery to implant a lag screw, the lag screw sleeve assembly comprising an adjusting nut and a lag screw sleeve, the adjusting nut having a hollow body and an internal thread on a portion of its inner surface, the lag screw sleeve having a hollow body and an external thread on a portion of its outer surface engaging with the internal thread, the outer surface of the adjusting nut having a recessed portion for cooperating with the aiming module, It is characterized by: The tension screw sleeve assembly also includes a sliding sleeve arranged between the adjusting nut and the tension screw sleeve. When the adjusting nut rotates, the end face of the adjusting nut and the end face of the end of the sliding sleeve remain in the axial position of the tension screw sleeve. When the end of the sliding sleeve abuts against the corresponding part of the adjusting nut, the outer end face of the end of the sliding sleeve is flush with the corresponding outer end face of the adjusting nut.

2. The lag screw sleeve assembly according to claim 1, wherein: The tension screw sleeve is internally provided with a guide hole for allowing the tension screw to pass through and a guide hole for allowing the pressure screw to pass through.

3. The lag screw sleeve assembly according to claim 1, wherein: The outer surface of the tension screw sleeve is a combination of a flat surface and an arc surface.

4. The lag screw sleeve assembly according to claim 1, wherein: It also includes an elastic member arranged in the sliding sleeve, and the sliding sleeve has a first stop portion, the tension screw sleeve has a second stop portion, and the elastic member is stopped by the first stop portion and the second stop portion.

5. The lag screw sleeve assembly according to claim 4, characterized in that: The sliding sleeve is provided with an axially extending sliding groove, and the tension screw sleeve is provided with a guiding portion, and the guiding portion can be slidably received in the sliding groove.

6. The lag screw sleeve assembly according to claim 5, characterized in that: The guide portion is a pin.

7. The lag screw sleeve assembly according to any one of claims 1 to 3, characterized in that: The sliding sleeve has a telescopic structure so that the positions of the end surface of the adjusting nut and the end surface of the end portion of the sliding sleeve in the axial direction of the tension screw sleeve remain unchanged.

8. A targeting module for use with the lag screw sleeve assembly according to any one of claims 1 to 7, characterized in that: The aiming module has a guide hole and an axial limiter that cooperate with the tension screw sleeve, and when the adjusting nut is located in the guide hole, the axial limiter engages with the recessed portion of the adjusting nut, thereby limiting the axial movement of the adjusting nut relative to the aiming module.

9. The aiming module according to claim 8, characterized in that The axial limiting component comprises a button and an elastic component. The button can rotate around a fixed axis, and one end of the button abuts against the elastic component.

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