Distal radius fracture dorsal bone block fixation system

Abstract

The utility model relates to a kind of distal radius fracture dorsal bone block fixing system, including palmar side steel plate, several palmar side fixed holes are opened on the palmar side steel plate, still include the dorsal steel plate corresponding with the position of fragmented dorsal bone block, at least one dorsal fixed hole is opened on the dorsal steel plate, the dorsal fixed hole is counterbore, the palmar side steel plate is integrally connected with dorsal steel plate by passing through the internal thread bolt of palmar side fixed hole and dorsal fixed hole and the fixed bolt matched with the internal thread bolt. The utility model can be used for treating distal radius dorsal fracture, to improve the holding force of isolated dorsal small steel plate on bone block by palmar side steel plate, effectively fixed fragmented dorsal bone block;Palmar side dorsal bidirectional locking can be through the degree of tightening to bone block pressurization, and also can avoid the same side arrangement multiple screws to cause bone block comminution.

Description

Technical Field

[0001] This utility model belongs to the field of orthopedic medical device technology, and in particular relates to a fixation system for the dorsal bone fragment in distal radius fractures. Background Technology

[0002] Palmar fixation with a plate is currently the most common clinical treatment for distal radius fractures. For example, the existing technology CN108309424A discloses a palmar locking plate for distal radius, which has advantages over dorsal plates, such as simple surgical approach, more soft tissue coverage on the bone surface (less prone to infection after internal fixation), flat palmar cortex (easy to place plate), and high fixation strength.

[0003] Dorsal fragment dislocation is a common type of intra-articular fracture of the distal radius, accounting for approximately 30% of all intra-articular fragments. However, clinically, fixing dorsal fragments with palmar plates still faces certain challenges. First, a simple palmar approach cannot directly reduce the dorsal fragment under vision, resulting in poor reduction outcomes. Second, due to the abundance of dorsal extensor tendons, the screws used in palmar plates generally do not penetrate the dorsal cortex; otherwise, the screw tips penetrating the dorsal side could cause extensor tendon damage or even rupture. Therefore, the fixation strength of dorsal fragments using palmar screws is insufficient, making the dorsal fragment prone to displacement and affecting wrist joint function.

[0004] Existing technology CN220404101U discloses a dorsal anatomical locking plate for distal radius fractures. This type of large plate is typically used for large, intact dorsal bone fragments. However, for some small, difficult-to-reduce dorsal bone fragments, due to the non-fixed location of the fractures, some orthopedic surgeons may use an auxiliary small dorsal incision for reduction during surgery, while using miniature plates or screws to fix the dorsal bone fragments. However, because the cortical bone of some dorsal bone fragments is thin, isolated dorsal plates and screw threads have weak holding force on the bone fragments, making it difficult to apply pressure to the bone fragments. If multiple screws are used for fixation, it may cause the bone fragments to shatter, easily causing interference with palmar screws. On the other hand, if the dorsal bone fragments are shattered, without a solid dorsal bone surface as a fixation fulcrum, the dorsal plates or screws will not be able to provide effective fixation. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a fixation system for the dorsal bone fragments in distal radius fractures, which provides effective fixation for small dorsal bone fragments that have detached in distal radius fractures.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to provide a fixation system for the dorsal bone fragment of distal radius fracture, including a palmar plate with a plurality of palmar fixation holes, and a dorsal plate corresponding to the position of the fractured dorsal bone fragment, the dorsal plate having at least one dorsal fixation hole, the dorsal fixation hole being a countersunk hole, the palmar plate and the dorsal plate being connected as one unit by internally threaded bolts passing through the palmar fixation hole and the dorsal fixation hole and fixing bolts mating with the internally threaded bolts.

[0007] Preferably, the palmar plate includes a distal radius fixation portion and a radial shaft fixation portion.

[0008] Preferably, the palmar plate is fitted to the palmar surface of the patient's radius.

[0009] Preferably, the shape of the dorsal steel plate matches the shape of the fragmented dorsal bone block, and the number of dorsal fixing holes is at least two and they are located at the ends of the dorsal steel plate.

[0010] Preferably, the palm-side fixing hole and the back-side fixing hole are universal screw fixing holes.

[0011] The beneficial effects are as follows: This utility model can be used to treat distal radius dorsal fractures. The palmar plate improves the holding force of the isolated dorsal small plate on the bone fragment, effectively fixing the fragmented dorsal bone fragment. The palmar and dorsal bidirectional locking can both apply pressure to the bone fragment by tightening and avoid the bone fragment from being pulverized by placing multiple screws on the same side. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a dorsal bone fragment fixation system for distal radius fractures.

[0013] Figure 2 for Figure 1 A schematic diagram of the existing technology for the steel plate on the middle palm side.

[0014] Figure 3 for Figure 1 Example diagram of the steel plate on the back side.

[0015] Among them, 1-palm side steel plate; 101-palm side fixing hole; 2-back side steel plate; 201-back side fixing hole; 3-fixing bolt; 4-internal threaded bolt; 401-screw head; 402-screw rod.

[0016] The same markings in each diagram represent the same component. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0018] like Figure 1 As shown, this utility model provides a fixation system for the dorsal bone fragment of a distal radius fracture, including a palmar plate 1 with a plurality of palmar fixation holes 101, and a dorsal plate 2 corresponding to the position of the fractured dorsal bone fragment, the dorsal plate 2 having at least one dorsal fixation hole 201, the dorsal fixation hole 201 being a countersunk hole, the palmar plate 1 and the dorsal plate 2 being connected as a whole by internally threaded bolts 4 passing through the palmar fixation holes 101 and the dorsal fixation holes 201 and fixation bolts 3 mating with the internally threaded bolts 4.

[0019] In one specific embodiment, the internally threaded bolt 4 includes a screw head 401 and a screw 402. The screw 402 has an internally threaded hole at its center at the end furthest from the screw head 401, and this internally threaded hole mates with the external thread of the fixing bolt 3. Typically, the fixing bolt 3 is used in the back-side fixing hole 201 of the back-side steel plate 2, and the internally threaded bolt 4 is used in the palm-side fixing hole 101 of the palm-side steel plate 1. Furthermore, after the fixing bolt 3 is inserted into the back-side fixing hole 201, it should be ensured that the height of its screw head 401 is not higher than the top surface of the back-side steel plate 2.

[0020] In one specific embodiment, the palmar steel plate 1 conforms to the palmar surface of the patient's radius. The palmar steel plate 1 includes a distal radius fixation portion and a radial shaft fixation portion, with the ulnar and radial edges on either side of the distal radius fixation portion, respectively. In actual production and use, the palmar steel plate 1 should be available in different sizes to suit patients of different heights.

[0021] In one specific embodiment, the shape of the dorsal steel plate 2 matches the shape of the fragmented dorsal bone piece, and the number of dorsal fixing holes 201 is at least two and they are located at the ends of the dorsal steel plate 2. Depending on the shape and size of the fragmented dorsal bone piece, the dorsal steel plate 2 can be strip-shaped, rhomboid, circular, T-shaped, triangular, etc. Figure 3 Example a in the text is a strip-shaped back-side steel plate 2, with a back-side fixing hole 201 at each end in the length direction; Figure 3 Example b in the example is a T-shaped back-side steel plate 2, which has a back-side fixing hole 201 at each of its three ends, and two back-side fixing holes 201 on its longitudinal side.

[0022] In one specific embodiment, the palmar fixation hole 101 and the dorsal fixation hole 201 are universal screw fixation holes. Universal screw fixation holes are existing technology; typically, fixation holes on bone plates have tapered threads. These holes mate with the tapered threads of the bone screw head. Because the taper of the fixation hole differs from the taper of the screw head, a misaligned thread connection can be achieved during mating. Therefore, the bone screw can be implanted into the bone off-center. This type of locking hole with tapered threads is called a universal screw fixation hole. To ensure that the angle of the bone screw's deviation from the axis meets the surgical requirements, the tapered thread hole is evenly distributed with arc-shaped grooves. The more arc-shaped grooves there are, the greater the angle of the bone screw's deviation from the axis, and the smaller the locking force between the bone screw and the locking hole. Existing locking holes with universal functionality on the market typically consist of a tapered thread hole and four or six arc-shaped grooves. The universal screw fixation hole in this embodiment has four arc-shaped grooves.

[0023] In use, this invention selects the palmar plate 1 according to the patient's radius; selects the corresponding dorsal plate 2 according to the comminution of the dorsal bone fragment; after selection, the guide pin is drilled from the palmar side of the radius to the dorsal side through the universal sleeve to determine the dorsal screw entry point, and the screw path is adjusted through the palmar universal hole to avoid the dorsal screw entry point being located in the fracture gap; after determining the appropriate dorsal entry point, the passage is completed by using a hollow drill along the opening of the dorsal guide pin; after the passage is completed, the palmar plate 1 is first placed on the distal end of the radius and the internal thread bolt 4 is inserted through the palmar fixation hole 101; then the dorsal plate 2 along with the comminuted dorsal bone fragment is placed in place and the fixation bolt 3 is screwed into the dorsal fixation hole 201, ensuring that the screw head 401 of the fixation bolt 3 is screwed into the internal thread of the internal thread bolt 4, and tightened to complete the fixation.

Claims

1. A fixation system for the dorsal bone fragment in a distal radius fracture, comprising a palmar plate having a plurality of palmar fixation holes, characterized in that, It also includes a dorsal steel plate corresponding to the location of the fractured dorsal bone fragment. The dorsal steel plate has at least one dorsal fixing hole, which is a countersunk hole. The palmar steel plate and the dorsal steel plate are connected as one unit by internal threaded bolts passing through the palmar fixing hole and the dorsal fixing hole and fixing bolts that match the internal threaded bolts.

2. The dorsal bone fragment fixation system for distal radius fractures according to claim 1, characterized in that, The palmar plate includes a distal radius fixation portion and a radial shaft fixation portion.

3. The dorsal bone fragment fixation system for distal radius fractures according to claim 1, characterized in that, The palmar plate is fitted to the palmar surface of the patient's radius.

4. The dorsal bone fragment fixation system for distal radius fractures according to claim 1, characterized in that, The shape of the dorsal steel plate matches the shape of the fragmented dorsal bone pieces, and the number of dorsal fixing holes is at least two and is located at the end of the dorsal steel plate.

5. A dorsal bone fragment fixation system for distal radius fractures according to claim 1, characterized in that, The palm-side fixing hole and the back-side fixing hole are universal screw fixing holes.

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