A PFNA assistant

Abstract

The utility model relates to the technical field of auxiliary device, especially PFNA auxiliary device, it is mainly aimed at the process of reaming, reaming and inserting the main nail from the fracture line or the nearby position of the great trochanter vertex when carrying out PFNA internal fixation often causes the broken end separation, delays the fracture healing even does not heal, influences the patient recovery effect and the life quality, and the existing hook, towel forceps, bone holder or skin extrusion etc. direct or indirect mode maintains the reduction effect is not ideal problem, proposes the following technical scheme: including sleeve, the guide needle is slidably connected in the sleeve, a plurality of groups of through -hole are installed in the sleeve outer circle, a plurality of groups of through -hole are annular array distribution, the through -hole is used for guiding the kirschner wire, the positioning assembly is arranged in one end of the sleeve, the positioning assembly is used for limiting the guide needle, the utility model can effectively fix the broken end, accurately position the guide needle, promotes the fracture healing, improves the operation efficiency and the patient recovery effect and the life quality.

Description

Technical Field

[0001] This utility model relates to the field of assistive device technology, and in particular to a PFNA assistive device. Background Technology

[0002] Proximal femoral nail antirotation (PFNA) is currently the mainstream surgical device and technique for treating proximal femoral fractures, offering advantages such as minimal surgical trauma, short recovery period, and good postoperative stability. However, PFNA internal fixation requires enlarging the fracture line at the apex of the greater trochanter or adjacent sites, followed by nail insertion. This process often leads to separation of the fracture ends, delaying fracture healing, and even causing nonunion, affecting the patient's rehabilitation and quality of life. Although some scholars have conducted related research and practice, such as using hooks, towel clamps, bone holders, or external compression to maintain reduction directly or indirectly, the results are often unsatisfactory. Therefore, this invention proposes a PFNA auxiliary device. Utility Model Content

[0003] The purpose of this invention is to address the problems in the prior art where, during PFNA internal fixation, the process of widening the hole and medullary canal at the fracture line or adjacent area at the apex of the greater trochanter to insert the main nail often causes separation of the fracture ends, delaying fracture healing or even causing nonunion, affecting the patient's rehabilitation effect and quality of life. Furthermore, existing methods such as hooks, towel clamps, bone holders, or external compression, whether direct or indirect, are not ideal for maintaining the reduction effect. Therefore, this invention proposes a PFNA assist device.

[0004] The technical solution of this utility model is as follows: A PFNA auxiliary device includes a sleeve in which a guide needle is slidably connected; multiple sets of through holes installed on the outer ring of the sleeve, the multiple sets of through holes being arranged in a ring array, the through holes being used to guide the Kirschner wire; a positioning component disposed at one end of the sleeve, the positioning component being used to limit the guide needle; and an adjustment mechanism installed on the end of the sleeve near the positioning component, the adjustment mechanism being used to drive the positioning component to position the guide needle.

[0005] Optionally, the positioning component includes a retaining ring fixedly connected to the outer ring of the guide needle. The retaining ring has an "I" shaped cross-section and is located on the side of the sleeve away from the tip of the guide needle.

[0006] Optionally, multiple sets of locking blocks are engaged on the outer side of the retaining ring. A movable plate is fixedly connected to the side of the locking block away from the retaining ring. An action plate is fixedly connected to the side of the movable plate near the sleeve. Multiple sets of limiting rods are slidably connected in the action plate. The ends of the multiple sets of limiting rods near the guide pin are jointly fixedly connected to a first fixing plate. The ends of the multiple sets of limiting rods away from the first fixing plate are jointly fixedly connected to a second fixing plate. Both the first fixing plate and the second fixing plate are fixedly connected to the sleeve.

[0007] Optionally, a spring is fitted around the outer ring of the limiting rod, and the spring is positioned between the actuating plate and the first fixing plate.

[0008] Optionally, the adjustment mechanism includes multiple sets of locking plates, each fixedly connected to the end of the moving plate away from the locking block. The locking plates are fan-shaped, and a slot is provided on the side of the locking plate away from the moving plate. A protrusion is engaged in the slot. A rotating ring is fixedly connected to the outer side of the multiple sets of protrusions. Multiple clearance holes are provided on the outer side of the rotating ring, and the multiple sets of locking plates are slidably connected to the multiple sets of clearance holes.

[0009] Optionally, multiple sets of positioning plates are provided on the outer side of the rotating ring. The multiple sets of positioning plates are fixedly connected to one end of the sleeve. An arc-shaped rod is slidably connected in the positioning plate. The arc-shaped rod is concentric with the rotating ring. Connecting plates are fixedly connected to both ends of the arc-shaped rod. The multiple sets of connecting plates are fixedly connected to the outer side of the rotating ring.

[0010] Optionally, multiple sets of rotating columns are fixedly connected to the outer side of the rotating ring.

[0011] In summary, this application includes at least one of the following beneficial technical effects:

[0012] This invention features six sets of through holes arranged in a ring on the outer ring of the sleeve. Doctors can insert three to four Kirschner wires according to the condition of the fracture ends. The depth of the Kirschner wires is 2 cm to 3 cm, which can effectively fix the fracture ends, ensure the stability of the fracture ends during the medullary reaming process, avoid the separation of the fracture ends, thereby promoting fracture healing and improving the patient's rehabilitation effect and quality of life.

[0013] Furthermore, through the coordinated action of the positioning components and the adjustment mechanism, the moving plate is pushed to engage the locking block with the retaining ring on the outer ring of the guide needle, preventing the guide needle from slipping and ensuring that the sleeve and the guide needle move synchronously; rotating the rotating ring causes the protrusion to engage with the retaining plate groove, thereby positioning the guide needle. Reverse operation can easily allow the guide needle to slide out. The whole process is simple to operate, accurately positions the guide needle, provides convenience for subsequent surgical operations such as the insertion of the main nail, and improves surgical efficiency.

[0014] In summary, this invention can effectively fix the fracture ends, accurately position the guide pin, promote fracture healing, and improve surgical efficiency, patient rehabilitation, and quality of life. Attached Figure Description

[0015] Figure 1 A schematic diagram of a PFNA helper is provided;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3This is a diagram showing the block moving away from the retaining ring.

[0018] Figure label:

[0019] 1. Sleeve; 11. Through hole;

[0020] 2. Guide needle;

[0021] 3. Positioning component; 31. Snap ring; 32. Snap block; 33. Moving plate; 34. Actuating plate; 35. Limiting rod; 36. First fixing plate; 37. Second fixing plate; 38. Spring;

[0022] 4. Adjustment mechanism; 41. Card plate; 42. Card slot; 43. Protrusion; 44. Rotating ring; 45. Clearance hole; 46. Positioning plate; 47. Arc rod; 48. Connecting plate; 49. Rotating column. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example

[0029] like Figure 1 As shown, this utility model proposes a PFNA (Peripherally Puncture-Assisted Reduction) device, including a sleeve 1 with a guide pin 2 slidably connected within it. Six sets of through holes 11 are installed on the outer ring of the sleeve 1, arranged in a circular array. These through holes 11 guide the Kirschner wires, allowing the surgeon to insert three to four Kirschner wires through the through holes 11 to fix the fracture ends, depending on the degree and direction of the fracture. During PFNA internal fixation, before inserting the main nail, the fracture end position is reconfirmed via fluoroscopy. After determining the nail insertion point, an incision is made, the guide pin 2 is inserted, and the Kirschner wires are inserted through the through holes 11 to a depth of 2-3 cm to ensure stability of the fracture ends during subsequent medullary reaming. After medullary reaming, the sleeve 1 and Kirschner wires can be removed, leaving the guide pin 2. Next, the main nail is inserted, and the guide pin 2 is removed. After confirming the main nail is in good position, proximal and distal locking screws are inserted, and their positions are confirmed via fluoroscopy. Finally, after confirming good fracture reduction, the wound is sutured.

[0030] For further details, please refer to Figure 2 and Figure 3The aforementioned auxiliary device includes a positioning component 3 disposed at one end of the sleeve 1, which is used to limit the guide needle 2. The positioning component 3 includes a retaining ring 31 fixedly connected to the outer ring of the guide needle 2, and the retaining ring 31 moves synchronously with the guide needle 2. The retaining ring 31 has an "I" shaped cross-section and is disposed on the side of the sleeve 1 away from the tip of the guide needle 2. Four sets of retaining blocks 32 are engaged on the outside of the retaining ring 31. After the retaining blocks 32 are engaged on the outside of the retaining ring 31, they prevent the guide needle 2 from sliding and ensure the synchronous movement of the sleeve 1 and the guide needle 2. A moving plate 33 is fixedly connected to the side of the retaining blocks 32 away from the retaining ring 31, and the moving plate 33 moves synchronously with the retaining blocks 32. An action plate 34 is fixedly connected to the side of the moving plate 33 near the sleeve 1, and the action plate 34 moves synchronously with the moving plate 33. Two sets of limiting rods 35 are slidably connected in the action plate 34. The ends of the two sets of limiting rods 35 near the guide needle 2 are fixedly connected to a first fixing plate 36, and the ends of the two sets of limiting rods 35 away from the first fixing plate 36 are fixedly connected to a second fixing plate 37. Both the first fixing plate 36 and the second fixing plate 37 are fixedly connected to the sleeve 1. The fixed positions of the limiting rods 35, the first fixing plate 36, and the second fixing plate 37 ensure smooth movement of the action plate 34. At the same time, the setting of the first fixing plate 36 and the second fixing plate 37 limits the movement range of the moving plate 33 and the locking block 32. A spring 38 is sleeved on the outer ring of the limiting rod 35. The spring 38 is located between the action plate 34 and the first fixing plate 36. The elastic force of the spring 38 helps the locking block 32 move away from the retaining ring 31, thereby facilitating the sliding of the guide needle 2 out of the sleeve 1.

[0031] Furthermore, the aforementioned auxiliary device also includes an adjustment mechanism 4 installed on the end of the sleeve 1 near the positioning component 3. The adjustment mechanism 4 is used to drive the positioning component 3 to position the guide pin 2. The adjustment mechanism 4 includes four sets of locking plates 41. The locking plates 41 are fixedly connected to the end of the moving plate 33 away from the locking block 32. The locking plates 41 are fan-shaped and move synchronously with the moving plate 33. A slot 42 is provided on the side of the locking plate 41 away from the moving plate 33. A protrusion 43 is engaged in the slot 42. The protrusion 43 is used to limit the position of the locking plate 41, so that the locking block 32 is fixed in the position of engaging the outer side of the locking ring 31. A rotating ring 44 is fixedly connected to the outer side of the four sets of protrusions 43. The rotating ring 44 drives the four sets of protrusions 43 to move synchronously, so that the four sets of protrusions 43 are simultaneously engaged in the four sets of slots 42. Four sets of clearance holes 45 are provided on the outer side of the rotating ring 44. Four sets of retaining plates 41 are slidably connected to the four sets of clearance holes 45. The clearance holes 45 facilitate the movement of the retaining block 32 away from the retaining ring 31, allowing the guide pin 2 to move. Four sets of positioning plates 46 are provided on the outer side of the rotating ring 44. The four sets of positioning plates 46 are fixedly connected to one end of the sleeve 1, and the position of the positioning plates 46 is fixed. An arc-shaped rod 47 is slidably connected in the positioning plate 46. The arc-shaped rod 47 is concentric with the rotating ring 44. Connecting plates 48 are fixedly connected to both ends of the arc-shaped rod 47. Multiple sets of connecting plates 48 are fixedly connected to the outer side of the rotating ring 44. The setting of the connecting plates 48 makes the arc-shaped rod 47 rotate synchronously with the rotating ring 44, and with the limiting effect of the positioning plates 46, the rotation of the rotating ring 44 is stable. Multiple sets of rotating columns 49 are fixedly connected to the outer side of the rotating ring 44. The setting of the rotating columns 49 facilitates the rotation of the rotating ring 44.

[0032] In this embodiment, during PFNA internal fixation, the location of the fracture ends is first confirmed again by fluoroscopy, and the incision is made after determining the entry point. The guide pin 2 is inserted into the sleeve 1, at which point the guide pin 2 can slide within the sleeve 1. A retaining ring 31 is fixed to the outer ring of the guide pin 2. The retaining ring 31 has an "I"-shaped cross-section and is located on the side of the sleeve 1 away from the tip of the guide pin 2.

[0033] Rotating the rotating ring 44 via the rotating column 49 causes the arc-shaped rod 47 to rotate within the positioning plate 46 via the connecting plate 48. This causes the protrusion 43 on the outer side of the rotating ring 44 to engage with the slot 42 of the clamping plate 41, thereby fixing the position of the clamping plate 41 and further fixing the position of the clamping block 32 on the outer side of the clamping ring 31, preventing the guide needle 2 from sliding and ensuring the synchronous movement of the sleeve 1 and the guide needle 2. The action plate 34 of the moving plate 33, located near the sleeve 1, slides smoothly on the two sets of limiting rods 35. The first fixing plate 36 and the second fixing plate 37 at both ends of the limiting rods 35 are fixed to the sleeve 1, limiting the movement range of the moving plate 33 and the clamping block 32.

[0034] Depending on the degree and direction of fracture, three to four Kirschner wires are driven into the six sets of through holes 11 arranged in a ring on the outer ring of the sleeve 1. The Kirschner wires are driven into the sleeve to a depth of 2 cm to 3 cm to fix the fracture ends and ensure that the fracture ends remain stable during the subsequent medullary reaming process.

[0035] During reaming, sleeve 1 and guide pin 2 move synchronously to maintain fracture stability. After reaming, rotating ring 44 is rotated in the opposite direction, causing protrusion 43 to disengage from slot 42. Under the elastic force of spring 38, action plate 34 moves moving plate 33 and locking block 32 away from locking ring 31, allowing guide pin 2 to slide out of sleeve 1. Sleeve 1 and Kirschner wires are removed, while guide pin 2 is retained. Next, the main screw is inserted, and guide pin 2 is removed. After confirming the main screw is in good position, proximal and distal locking screws are inserted, and their positions are confirmed by fluoroscopy. Finally, after confirming good fracture reduction, the wound is sutured.

[0036] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A PFNA helper, characterized in that, include: Sleeve (1), wherein a guide pin (2) is slidably connected in sleeve (1); Multiple sets of through holes (11) are installed on the outer ring of the sleeve (1), and the multiple sets of through holes (11) are arranged in a ring array. The through holes (11) are used to guide the Kirschner wires. A positioning component (3) is provided at one end of the sleeve (1), and the positioning component (3) is used to limit the guide needle (2); An adjustment mechanism (4) is installed on one end of the sleeve (1) near the positioning component (3). The adjustment mechanism (4) is used to drive the positioning component (3) to position the guide needle (2).

2. The PFNA helper according to claim 1, characterized in that, The positioning component (3) includes a retaining ring (31) fixedly connected to the outer ring of the guide needle (2). The retaining ring (31) has an "I" shaped cross section and is located on the side of the sleeve (1) away from the tip of the guide needle (2).

3. A PFNA helper according to claim 2, characterized in that, Multiple sets of locking blocks (32) are engaged on the outside of the retaining ring (31). A movable plate (33) is fixedly connected to the side of the locking block (32) away from the retaining ring (31). An action plate (34) is fixedly connected to the side of the movable plate (33) near the sleeve (1). Multiple sets of limiting rods (35) are slidably connected in the action plate (34). A first fixing plate (36) is fixedly connected to the end of the multiple sets of limiting rods (35) near the guide pin (2). A second fixing plate (37) is fixedly connected to the end of the multiple sets of limiting rods (35) away from the first fixing plate (36). Both the first fixing plate (36) and the second fixing plate (37) are fixedly connected to the sleeve (1).

4. A PFNA helper according to claim 3, characterized in that, A spring (38) is fitted around the outer ring of the limiting rod (35), and the spring (38) is located between the actuating plate (34) and the first fixing plate (36).

5. A PFNA helper according to claim 4, characterized in that, The adjustment mechanism (4) includes multiple sets of clamping plates (41). The clamping plates (41) are fixedly connected to the end of the moving plate (33) away from the clamping block (32). The clamping plates (41) are fan-shaped. The side of the clamping plates (41) away from the moving plate (33) has a slot (42). A protrusion (43) is engaged in the slot (42). A rotating ring (44) is fixedly connected to the outer side of the multiple sets of protrusions (43). Multiple clearance holes (45) are opened on the outer side of the rotating ring (44). The multiple sets of clamping plates (41) are slidably connected in the multiple sets of clearance holes (45).

6. A PFNA helper according to claim 5, characterized in that, Multiple positioning plates (46) are provided on the outer side of the rotating ring (44). The multiple positioning plates (46) are fixedly connected to one end of the sleeve (1). An arc-shaped rod (47) is slidably connected in the positioning plate (46). The arc-shaped rod (47) is concentrically arranged with the rotating ring (44). Both ends of the arc-shaped rod (47) are fixedly connected to connecting plates (48). The multiple connecting plates (48) are fixedly connected to the outer side of the rotating ring (44).

7. A PFNA helper according to claim 6, characterized in that, Multiple sets of rotating columns (49) are fixedly connected to the outer side of the rotating ring (44).

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