CN216124534U

CN216124534U - Surgical internal fixation assembly for patellar fracture

Info

Publication number: CN216124534U
Application number: CN202022770101.0U
Authority: CN
Inventors: 何齐芳; 钱进; 韩啸; 谢涛; 占宇; 张彬彬; 谢雪涛; 朱六龙; 罗从风
Original assignee: Hangzhou First Peoples Hospital
Current assignee: Hangzhou First Peoples Hospital
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-03-25
Anticipated expiration: 2030-11-25

Abstract

The utility model relates to the field of medical instruments and discloses an internal surgical fixing component for patellar fracture. The support positioning plate is a narrow and long upward bending plate and comprises a lower pole supporting part serving as a bending part and bridging positioning parts extending upwards from two ends of the lower pole supporting part in the plate length direction; the locking fixing piece is used for fixedly connecting the bridging positioning part to the body part of the patella, and the end part position of the bridging positioning part exceeds half of the vertical height of the patella; the lower limit position piece is arranged at the front end of the lower pole supporting part and is used for limiting the patella lower pole to move forwards. The internal fixation assembly for the operation can ensure enough fixing strength and prevent the displacement of the patella lower pole fracture block after the operation. In addition, the locking fixing piece and the supporting positioning plate form a three-dimensional frame type fixing, which is beneficial to maintaining the crushed patella fracture after reduction.

Description

Surgical internal fixation assembly for patellar fracture

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an internal surgical fixing component for patellar fracture.

Background

The patella is the biggest seed bone of human body, participates in and constitutes the knee joint, and the vertical lower quarter of patella is called the patella lower pole, and the rear surface of patella lower pole does not have articular surface, and the patella lower pole passes through the patellar ligament and connects in the shin bone.

For the patella lower pole fracture, the existing scheme fixes the patella lower pole fracture through a tension band or a steel wire cerclage, the fixing strength is insufficient, and the fractured patella lower pole bone block is easy to shift and needs long-term postoperative braking.

SUMMERY OF THE UTILITY MODEL

In view of at least one of the above-mentioned drawbacks or disadvantages of the prior art, the present invention provides an intra-operative fixation assembly for fractured patella, which can ensure sufficient fixation strength and prevent the inferior patella fracture from shifting after operation.

To achieve the above object, the present invention provides an intra-operative fixation assembly for patellar fracture, including:

the support positioning plate is a narrow and long upward bending plate and comprises a lower pole supporting part as a bending part and bridging positioning parts extending upwards from two ends of the lower pole supporting part in the plate length direction;

the locking fixing piece is used for fixedly connecting the bridging positioning part to the patella body, and the end part position of the bridging positioning part exceeds half of the vertical height of the patella; and

the lower limit position piece is arranged at the front end of the lower pole supporting part and is used for limiting the forward movement of the patella lower pole.

Optionally, the lower pole support portion includes a support portion bending section and two support portion extension sections respectively connected to the two lateral ends of the support portion bending section, the lower limit component is strip-shaped, and the strip-shaped lower limit component extends laterally inward from the front end of the support portion extension section and bends toward the rear.

Optionally, the extension sections of the two supporting portions are respectively an extension section of a left supporting portion and an extension section of a right supporting portion, the lower limit part includes a left limit part extending from the extension section of the left supporting portion and a right limit part extending from the extension section of the right supporting portion, and the left limit part and the right limit part are vertically arranged in sequence in a staggered manner.

Optionally, the lower limit stop is sized to match the anterior surface profile of the patellar lower pole.

Optionally, the end profile of the bridge locating portion is arranged to narrow upwardly.

Optionally, the locking fixing piece includes a common screw and a locking screw, the supporting positioning plate is sequentially provided with a common screw hole matched with the common screw and a locking screw hole matched with the locking screw at intervals along the plate length direction, the common screw hole is located at the end portion of the bridging positioning portion, and the locking screw hole is located below the common screw hole.

Optionally, the locking screw hole includes a front locking screw hole disposed proximate a front end edge of the bridge locating portion and a rear locking screw hole disposed proximate a rear end edge of the bridge locating portion.

Optionally, the locking screw hole comprises a lower pole locking screw hole formed in the support bend section, and the intra-operative fixation assembly further comprises a locking screw mated to the lower pole locking screw hole.

Optionally, a locking screw cooperating with the anterior locking screw hole is provided for penetrating the patella from the anterior face of the patella towards the articular face of the patella, the locking screw being inclined downwardly with respect to the horizontal plane and at an angle of no more than 10 °.

Optionally, the supporting and positioning plate is V-shaped or U-shaped.

According to the technical scheme, in the internal surgical fixing component, the lower pole supporting part is abutted to the lower pole position of the patella to prevent the displacement of the fracture block of the lower pole of the patella caused by the traction of the patellar ligament, the supporting positioning plate is fixed on the body part of the patella through the locking and fixing part, and the end part of the cross-over positioning part is ensured to reach more than half of the vertical height of the patella, so that the supporting positioning plate can cover the enough outer edge surface of the patella, is of a plate-shaped structure and has enough contact area with the outer edge surface of the patella, and the fixing strength of the supporting positioning plate for fixing the fracture block of the lower pole of the patella can be ensured. And the lower limit component is abutted against the front surface of the lower pole of the patella, so that when a patient bends the knee, the lower limit component can prevent the fracture block of the lower pole of the patella from shifting towards the front of the patella. Therefore, the intra-operative fixing component can ensure enough fixing strength and prevent the patella lower pole fracture block from shifting after operation.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a front view of a post-operative fixation assembly for a fractured patella according to an embodiment of the present invention;

FIG. 2 is a right side view of the support positioning plate according to the embodiment of the present invention;

FIG. 3 is an assembled perspective view of a post-operative fixation assembly for a fractured patella and a patella according to an embodiment of the present disclosure;

fig. 4 is a partial sectional view at a in fig. 3.

Description of reference numerals:

1 supporting positioning plate 2 locking fixing piece

3 Patella

11 bridging positioning part 12 lower pole supporting part

13 lower limit stop 21 common screw

22 locking screw 31 patellar lower pole

111 ordinary screw hole 112 locking screw hole

121 support portion extension section 122 support portion bending section

131 left stopper 132 right stopper

1121 front side locking screw hole 1122 rear side locking screw hole

1123 lower pole locking screw hole

1211 left support portion extension section 1212 and right support portion extension section

Detailed Description

The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the utility model, are given by way of illustration and explanation only, not limitation.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom, vertical, lateral, left, and right" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.

The utility model will be described in detail below with reference to exemplary embodiments and with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, an exemplary embodiment of the present invention provides an intra-operative fixing assembly for patellar fracture, which includes a support positioning plate 1, a locking fixture 2 and a lower limit stop 13. The supporting and positioning plate 1 is a narrow and long upward bending plate and comprises a lower pole supporting part 12 as a bending part and a bridging positioning part 11 extending upwards from two ends of the lower pole supporting part 12 in the plate length direction; the locking fixing piece 2 is used for fixedly connecting the bridging positioning part 11 to the body of the patella, and the end position of the bridging positioning part 11 exceeds half of the vertical height of the patella 3; the lower limit stopper 13 is arranged at the front end of the lower pole support part 12 and is used for limiting the forward movement of the patella lower pole.

Specifically, the fractured patella fracture block is firstly reset through the resetting forceps, and the lower pole supporting part 12 is abutted against the patella lower pole 31 so as to prevent the displacement of the patella lower pole fracture block caused by the traction of the patellar ligament. Will support locating plate 1 through locking mounting 2 and be fixed in the kneecap somatic part to guarantee that the tip of cross-over connection location portion 11 reaches more than half of the 3 vertical height of kneecap, make support locating plate 1 can cover 3 outer surfaces of following of sufficient kneecap, and support locating plate 1 and be platelike structure, have sufficient area of contact with 3 outer surfaces of following of kneecap, so can guarantee to support the fixed intensity of extremely fractured block under the fixed kneecap of locating plate 1. And the lower limit part 13 is abutted against the front surface of the patella lower pole 31, when the patient bends the knee, the lower limit part 13 can prevent the patella lower pole fracture block from shifting towards the front of the patella 3. Therefore, the intra-operative fixing component can ensure enough fixing strength and prevent the patella lower pole fracture block from shifting after operation.

Preferably, the supporting and positioning plate 1 is a medical titanium alloy steel plate with a width ranging from 7mm to 10mm and a thickness ranging from 0.5mm to 1.2 mm. Can guarantee to support sufficient intensity and elasticity of locating plate 1, adapt to the appearance of different kneecaps, improve the commonality, also can avoid because of supporting locating plate 1 too huge to kneecap 3 around soft tissue produce irritate.

Further, the supporting and positioning plate 1 is V-shaped or U-shaped. Because the vertical latter half outline of kneecap 3 is whole to be the V font, and the backup pad locating plate is the V font and changes the 3 outer surfaces of following of laminating kneecap. Of course, when the support plate is U-shaped, the patella lower pole 31 can be supported on the lower pole support portion 12, so that the situation that the patella lower pole fracture block is displaced due to patella ligament traction is avoided.

As shown in fig. 2, the end contour of the bridge positioning portion 11 is further narrowed upward. Namely, the end of the bridging positioning part 11 is a tip, which is convenient for inserting the supporting and positioning plate 1 into the opened operation incision. In addition, the tip also has a guiding function when the position of the supporting and positioning plate 1 needs to be adjusted.

As shown in fig. 2, in an embodiment, the lower pole support 12 includes a support bending section 122 and two support extension sections 121 respectively connected to two lateral ends of the support bending section 122, the lower limit stop 13 is in a strip shape, and the strip-shaped lower limit stop 13 extends laterally inward from a front end of the support extension section 121 and is bent toward the rear.

Specifically, the support positioning plate 1 is a flat plate and is bent to form a lower pole support part 12, a bridging positioning part 11 and a lower limit part 13, so that the manufacturing process is simple and the production is convenient. The lower limit stop 13 is folded around the anterior surface of the patellar mandible 31 and rests against the anterior surface of the patellar mandible 31. The width of the lower limit stop 13 in the form of a strip in this embodiment ranges from 3mm to 5mm, which ensures that the lower limit stop 13 has a certain elasticity and sufficient pressure to prevent the inferior fracture of the patella 3 from shifting anteriorly towards the patella 3.

Further, the two supporting portion extending sections 121 are a left supporting portion extending section 1211 and a right supporting portion extending section 1212, respectively, the lower limit member 13 includes a left limit member 131 extending from the left supporting portion extending section 1211 and a right limit member 132 extending from the right supporting portion extending section 1212, and the left limit member 131 and the right limit member 132 are vertically and sequentially arranged in a staggered manner.

Specifically, the left-side supporting portion extension 1211 and the right-side supporting portion extension 1212 are respectively located on the left and right sides of the supporting portion bending portion 122, the left-side limiting member 131 is a strip-shaped plate extending from the left-side supporting portion extension 1211, the right-side limiting member 132 is a strip-shaped plate extending from the right-side supporting portion extension 1212, and the left-side limiting member 131 and the right-side limiting member 132 are sequentially and alternately abutted against the front surface of the patella lower pole 31 along the vertical direction of the patella 3. By the arrangement, the pressure of the lower limit part 13 acting on the front surface of the patella lower pole 31 is more uniform, and the fracture block of the patella lower pole 31 is prevented from tilting. In the present embodiment, there is one left side limiting member 131 and one right side limiting member 132, and of course, the number of the left side limiting members 131 or the right side limiting members 132 may be increased according to actual situations.

Further, the lower limit stop 13 is sized to match the anterior surface profile of the patellar lower pole 31. As shown in fig. 1 and fig. 2, in the present embodiment, the left-side stopper 131 is disposed vertically above the right-side stopper 132, and since the outer contour of the patella lower pole 31 is V-shaped and the surface contour thereof is inwardly contracted toward the tip of the patella, the length of the left-side stopper 131 is longer than that of the right-side stopper 132, and the vertical height between the left-side stopper 131 and the left-side support extension 1211 is greater than that between the right-side stopper 132 and the right-side support extension 1212. Because the heights of different patella lower poles are slightly different, the lower limit component 13 is arranged against the front surface contour of the patella lower pole 31, and the pressure of the lower limit component 13 acting on the patella lower pole 31 can be adjusted only by slightly adjusting the vertical heights of the lower limit component 13 and the lower pole supporting part 12.

As shown in fig. 1, 3 and 4, in one embodiment, the locking fixing member 2 includes a common screw 21 and a locking screw 22, a common screw hole 111 engaged with the common screw 21 and a locking screw hole 112 engaged with the locking screw 22 are sequentially provided at intervals along a plate length direction on the supporting and positioning plate 1, the common screw hole 111 is located at an end portion of the bridging and positioning portion 11, and the locking screw hole 112 is located below the common screw hole 111.

In particular, bone screws can be divided into two main categories, locking screws 22 and ordinary screws 21. The ordinary screw 21 penetrates the patella 3 from the ordinary screw hole 111 to fix the support positioning plate 1 in a proper position for positioning. The locking screw 22 serves to firmly fix the support and positioning plate 1 around the outer peripheral surface of the patella 3, ensuring that the support and positioning plate 1 has sufficient traction to maintain the reduction of the fractured patella bone pieces. In addition, the nut and the screw of the locking screw 22 are both provided with threads, the locking screw hole 112 is provided with threads matched with the nut, the nut is in threaded connection with the locking screw hole 112 to combine the locking screw 22 and the support positioning plate 1 into a whole, and the support positioning plate 1 does not need to be pressed on the outer edge surface of the patella 3 to generate friction force for fixing, namely, a gap can be reserved between the outer edge surfaces of the support positioning plate 1 and the patella 3, the periosteum of the patella 3 can not be extruded, and the blood circulation of the periosteum is ensured. In the present embodiment, it is preferable that the screw diameters of the locking screw 22 and the ordinary screw 21 are not less than 2.7mm to ensure sufficient locking force.

As shown in fig. 2, the common screw hole 111 is preferably a kidney-shaped hole. The ordinary screws 21 press the support and positioning plate 1 against the outer surface of the patella 3 to create friction to position it. When the common screw 21 does not completely lock the support positioning plate 1 on the outer edge surface of the patella 3, the adjustable range is larger to control the fixing position of the support positioning plate 1, and the support positioning plate 1 is locked on the outer edge surface of the patella 3 after the proper fixing position is confirmed.

Further, the locking screw hole 112 includes a front locking screw hole 1121 provided near a front end edge of the bridge positioning portion 11 and a rear locking screw hole 1122 provided near a rear end edge of the bridge positioning portion 11.

Specifically, the bridging positioning portion 11 is provided with double rows of locking screw holes 112, and the front locking screw holes 1121 and the rear locking screw holes 1122 are sequentially arranged in a staggered manner along the plate length direction of the bridging positioning portion 11, so that the plate width direction of the bridging positioning portion 11 can be fully utilized. In addition, so arrange, also can improve the fixed strength who supports locating plate 1, avoid supporting locating plate 1 upset.

As shown in fig. 1 and 2, further, the locking screw hole 112 includes a lower pole locking screw hole 1123 formed in the support bend 122, and the intra-operative fixation assembly further includes a locking screw 22 that mates with the lower pole locking screw hole 1123.

Specifically, the locking screw 22 penetrates into and penetrates through the patella lower pole 31 from the lower pole locking screw hole 1123 to further connect the patella lower pole 31 with other parts of the patella 3, so that the fixing strength is improved, and medical staff can confirm whether the locking screw 22 at the patella lower pole 31 needs to be added according to conditions.

Further, as shown in fig. 4, a locking screw 22 cooperating with the anterior locking screw hole 1121 is provided for penetrating the patella 3 from the anterior face of the patella 3 toward the patellar articular face, and the locking screw 22 is inclined downward with respect to the horizontal plane by an angle of not more than 10 °.

Specifically, the patellar articular surface articulates the patella 3 with the femur to participate in the makeup of the knee joint. The locking screw 22 in the anterior locking screw hole 1121 can be obliquely inserted into the patella 3 in the direction of the patellar articular surface, and can improve the fixing strength of the patellar articular surface. Especially for comminuted patella fracture, the locking screw 22 which is penetrated into the patella 3 in a crossed way and the supporting and positioning plate 1 form a three-dimensional frame for fixation, the fixing strength is higher, the comminuted patella ossicle block can be locked, and the maintenance after the comminuted patella fracture is reset is convenient. In addition, the angle of the downward inclination of the locking screw 22 penetrating through the hole of the anterior locking screw hole 1121 relative to the horizontal plane is not more than 10 degrees, so that the locking screw 22 is prevented from penetrating out of the patellar articular surface, and the adverse effect on the knee joint is avoided.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.

It should be noted that, in the foregoing embodiments, various features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in further detail in the embodiments of the present invention.

In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.

Claims

1. An intra-operative fixation assembly for a patellar fracture, the intra-operative fixation assembly comprising:

the positioning device comprises a supporting positioning plate (1), a positioning part and a positioning part, wherein the supporting positioning plate is a narrow and long upward bending plate and comprises a lower pole supporting part (12) serving as a bending part and bridging positioning parts (11) extending upwards from two ends of the lower pole supporting part in the plate length direction;

the locking fixing piece (2) is used for fixedly connecting the bridging positioning part (11) to the body of the patella, and the end position of the bridging positioning part (11) exceeds half of the vertical height of the patella (3); and

the lower limit stop piece (13) is arranged at the front end of the lower pole supporting part (12) and is used for limiting the forward movement of the patella lower pole (31).

2. The intra-operative fixation assembly for patellar fracture according to claim 1, wherein the lower pole support (12) comprises a support bending section (122) and two support extension sections (121) respectively connected to both lateral ends of the support bending section (122), the lower limit stop (13) is in the form of a strip, and the strip-shaped lower limit stop (13) extends laterally inward from a front end of the support extension section (121) and is bent backward.

3. The intra-operative fixation assembly for patellar fractures according to claim 2, wherein the two strut-side extensions (121) are a left-side strut-side extension (1211) and a right-side strut-side extension (1212), respectively, and the lower limit stop (13) comprises a left-side limit stop (131) extending from the left-side strut-side extension (1211) and a right-side limit stop (132) extending from the right-side strut-side extension (1212), the left-side limit stop (131) and the right-side limit stop (132) being vertically staggered in sequence.

4. The surgical internal fixation assembly for patellar fractures according to claim 3, characterized in that the lower limit stop (13) is sized to match the anterior surface profile of the patellar lower pole (31).

5. The intra-operative fixation assembly for patellar fractures according to claim 1, characterized in that the end profile of the bridge positioning portion (11) is upwardly narrowly set.

6. The intra-operative fixation assembly for patellar fracture according to claim 2, wherein the locking fixture (2) comprises a common screw (21) and a locking screw (22), a common screw hole (111) engaged with the common screw (21) and a locking screw hole (112) engaged with the locking screw (22) are sequentially provided on the support positioning plate (1) at intervals along the plate length direction, the common screw hole (111) is located at an end position of the bridge positioning portion (11), and the locking screw hole (112) is located below the common screw hole (111).

7. The intra-operative fixation assembly for patellar fracture according to claim 6, wherein the locking screw hole (112) comprises a anterior locking screw hole (1121) disposed proximate a anterior end edge of the cross-over locating portion (11) and a posterior locking screw hole (1122) disposed proximate a posterior end edge of the cross-over locating portion (11).

8. The surgical internal fixation assembly for patellar fracture according to claim 6, wherein the locking screw hole (112) comprises a inferior pole locking screw hole (1123) formed in the buttress segment (122), the surgical internal fixation assembly further comprising the locking screw (22) mated to the inferior pole locking screw hole (1123).

9. The surgical internal fixation assembly for patellar fractures according to claim 7, characterized in that the locking screw (22) cooperating with the anterior locking screw hole (1121) is provided for penetrating the patella (3) from the anterior face of the patella (3) towards the patellar articular face, the locking screw (22) being inclined downwards and at an angle of not more than 10 ° relative to the horizontal plane.

10. The intra-operative fixation assembly for patellar fracture according to any one of claims 1-9, characterized in that the support positioning plate (1) is V-shaped or U-shaped.