Universal clamp block for external fixator

Abstract

The invention discloses a universal clamping block of an external fixator, which relates to the field of medical equipment. The clamping block is provided with a clamping part and a central axis. The clamping part is provided with a penetrating central hole. The clamping part is provided with a lower clamping block and an upper clamping block. The upper clamping block is butt-jointed with the lower clamping block. A clamping groove is provided between the butt-jointing surfaces. The central axis passes through the two clamping parts and is locked by nuts. A universal joint is provided in the middle of the central axis. Two ends of the universal joint are movably connected to two pull rods respectively. The pull rods are provided with movable bolts. The universal joint consists of a cross head and a pin shaft. Two ends of the cross head are provided with spherical surfaces. Long groove countersunk holes and pin holes penetrating the side walls of the two long groove countersunk holes are provided at both ends of the cross head. The two long groove countersunk holes are vertically arranged. Two pin shafts connect the two movable bolts with the cross head. The two movable bolts pass through the clamping part and are connected with the nuts respectively. A ball socket is provided at the other end of the lower clamping block to match the spherical surface of the cross head.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, in particular to a universal clamping block of an external fixator. Background Art

[0002] At present, clinical orthopedic doctors often use orthopedic external fixators in combination with bone needles to perform fracture plastic fixation surgery. The orthopedic external fixator includes components such as connecting rods, needle-rod clamps and rod-rod clamps. The needle-rod clamp is a MIM needle-rod clamp such as the one disclosed in CN214434438U, including: a central axis, a needle clamping part, a rod clamping part and a fastening part; the needle clamping part and the rod clamping part are sequentially sleeved on the central axis from top to bottom; the fastening part is detachably arranged at the bottom of the central axis; the bottom of the needle clamping part and the top of the rod clamping part are connected by a spring; a limiting part is provided on the upper part of the central axis; the limiting part and the fastening part cooperate with each other to clamp the needle clamping part and the rod clamping part; the rod clamping part clamps the connecting rod, the needle clamping part clamps the bone needle, and one needle-rod clamp clamps one bone needle; during the operation, two bone needles are driven into each fracture end and fixed to a connecting rod by two needle-rod clamps, and then a rod-rod clamp is used to connect and fix the connecting rods at the two fracture ends as a whole, so as to achieve the treatment effect. If the four bone pins at the two ends of the fracture can be fixed to a connecting rod, the safety risk caused by the connection of the rod clamp can be reduced, and the fixation firmness of the orthopedic external fixator can be increased; since the structure of the above-mentioned needle-rod clamp determines that the distance between the bone pins and the connecting rod is fixed, when the two bone pins are fixed to the connecting rod, the position of the connecting rod relative to the bone has been locked, and the insertion position and angle of the third and fourth bone pins are based on the orientation that is conducive to bone plastic surgery and fixation, and rarely meet the said distance; if the needles are inserted according to the said distance, the difficulty of the operation will be increased, and if the needles are not inserted according to the said distance: either the fracture cannot be aligned during the operation, or the bone will suffer great internal stress after the operation and cause the bone absorption in the needle channel and the loosening of the bone pins, so the above-mentioned needle-rod clamp is not suitable for the surgical plan of one rod and multiple needles. Summary of the invention

[0003] The invention discloses a universal clamping block of an external fixing frame, which overcomes the above-mentioned defects.

[0004] The universal clamp block of the external fixator is provided with two clamping parts and a central axis. The clamping part is provided with a penetrating central hole. Each clamping part is respectively provided with a lower clamping block and an upper clamping block. One end face of the upper clamping block is butted with one end face of the lower clamping block. A clamping groove is provided between the butting faces for clamping bone needles or connecting rods. The central axis passes through the central holes of the two clamping parts and is locked by nuts. It is characterized in that a universal joint is provided in the middle of the central axis, and two ends of the universal joint are respectively and movably connected to two pull rods.

[0005] Further, the pull rod is configured as a live bolt, one end of the live bolt is provided with a hole penetrating through the side face of the pull rod, and the other end is provided with a screw, the universal joint is composed of a crosshead and a pin shaft, both ends of the crosshead are configured as spherical surfaces, one spherical surface of the crosshead is provided with a first long groove countersunk hole, and a first pin hole penetrating through the two side walls of the first long groove countersunk hole, the other spherical surface of the crosshead is provided with a second long groove countersunk hole, and a second pin hole penetrating through the two side walls of the first long groove countersunk hole, the first long groove countersunk hole and the second long groove countersunk hole are vertically cross-arranged, the two live bolts, one end of which is provided with a hole, is respectively inserted into the first long groove countersunk hole and the second long groove countersunk hole at both ends of the crosshead, the two pin shafts are respectively arranged in the first pin hole and the second pin hole, and respectively pass through the holes of the live bolts, the two live bolts are movably connected to the universal joint, the other end face of the lower clamping block is provided with a ball socket, and the ball socket is matched with the spherical surfaces at both ends of the crosshead.

[0006] Furthermore, the ball socket of the lower clamping block is provided with a plurality of pits, and the spherical surfaces at both ends of the crosshead are respectively provided with two or more convex cones, and the convex cones are inserted into the pits to increase the combination stability between the spherical surface and the ball socket.

[0007] Further, the pull rod is configured as a ball stud, one end of the ball stud is provided with a ball head and the other end is provided with a screw, the universal joint is composed of a first connecting sleeve and a second connecting sleeve connected by a thread, one end of the first connecting sleeve is configured as a first spherical surface, the other end is provided with a threaded hole, the bottom end of the threaded hole is provided with a first ball socket, and an outwardly open tapered hole is provided between the first ball socket and the first spherical surface, one end of the second connecting sleeve is provided with a second spherical surface, the other end is provided with an external thread and an internal hole, the external thread is matched with the threaded hole, the bottom end of the inner hole is provided with a second ball socket, and an outwardly open tapered hole is provided between the second ball socket and the second spherical surface, the ball head of the ball stud is matched with the first ball socket and the second ball socket, one of the ball studs passes through the tapered hole of the first connecting sleeve and a group of clamping parts and is connected to a nut, and another ball stud passes through the tapered hole of the second connecting sleeve and another group of clamping parts and is connected to another nut.

[0008] Further, the universal clamp block of the external fixator is provided with two clamping parts and a central axis, the two clamping parts are respectively set as a first clamping part and a second clamping part, the first clamping part is provided with a first lower clamping block, the upper end of the first lower clamping block is provided with a first upper clamping block, the joint surface of the first lower clamping block and the first upper clamping block is provided with a clamping groove for clamping a bone needle or a connecting rod, the first lower clamping block is provided with a threaded hole passing through the upper and lower end surfaces, the upper end surface of the first upper clamping block protrudes upward and is provided with a third spherical surface, the first upper clamping block is provided with a through hole passing through the upper and lower parts, the second clamping part is provided with a second lower clamping block, and the upper end of the second lower clamping block is provided with a There is a second upper clamping block, and the second lower clamping block and the second upper clamping block have a clamping groove on the joint surface for clamping bone needles or connecting rods. The second clamping part has a tapered hole running through it from top to bottom, with the tapered hole facing upward. The lower end of the second lower clamping block has a third ball socket that cooperates with the third spherical surface. The upper end surface of the second upper clamping block has a fourth ball socket, and a spherical washer is provided in the fourth ball socket. The center axis is set as a hexagonal flange bolt, and the hexagonal flange bolt passes through the spherical washer, the second clamping part and the first upper clamping block in sequence from top to bottom, and is tightened in the threaded hole of the first lower clamping block to tighten the bone needle or connecting rod.

[0009] Beneficial effect: When the nut is loosened, the two clamping parts can swing and rotate in any direction, which greatly expands the needle insertion direction. Combined with the rotation and movement function of the universal clamp block of the external fixator relative to the connecting rod, a one-rod multi-needle surgical plan can be realized, thereby improving the safety of the orthopedic external fixator. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The figure is a three-dimensional structural schematic diagram of a first embodiment of a universal clamping block of an external fixator.

[0011] Figure 2 for Figure 1 sectional view of .

[0012] Figure 3 It is a schematic diagram of the structure of the crosshead.

[0013] Figure 4 for Figure 3 sectional view of .

[0014] Figure 5 It is a structural schematic diagram of the lower clamping block.

[0015] Figure 6 It is a structural schematic diagram of the upper clamping block.

[0016] Figure 7 It is a structural diagram of the pull rod.

[0017] Figure 8 The figure is a cross-sectional structural schematic diagram of a second embodiment of a universal clamping block of an external fixator.

[0018] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first connecting sleeve.

[0019] Fig.10 for Fig. 9 sectional view of .

[0020] Fig.11 It is a schematic diagram of the three-dimensional structure of the second connecting sleeve.

[0021] Fig.12 for Fig.11 sectional view of .

[0022] Fig.13 The figure is a schematic structural diagram of a third embodiment of a universal clamping block of an external fixator.

[0023] Fig.14 for Fig.13 sectional view of .

[0024] Explanation of the accompanying drawings: lower clamping block 1, ball socket 101, upper clamping block 2, nut 3, pivot bolt 4, hole 41, cross head 5, first long groove countersunk hole 51, first pin hole 52, second long groove countersunk hole 53, second pin hole 54, convex cone 55, pin shaft 6, first connecting sleeve 7, threaded hole 71, first ball socket 72, second connecting sleeve 8, external thread 81, second ball socket 82, ball head bolt 9, first lower clamping block 10, first upper clamping block 11, second lower clamping block 12, second upper clamping block 13, spherical washer 14, hexagonal flange screw 15. DETAILED DESCRIPTION

[0025] Figure 1-Figure 7 The specific structure of the first embodiment of a universal clamp block for an external fixator of the present invention is shown, wherein the universal clamp block for an external fixator is provided with two clamping parts and a central axis, wherein the clamping part is provided with a penetrating central hole, and each clamping part is provided with a lower clamping block 1 and an upper clamping block 2 respectively, wherein one end face of the upper clamping block 2 is butted against one end face of the lower clamping block 1, and a clamping groove is provided between the butting faces for clamping bone needles or connecting rods, wherein the central axis passes through the central holes of the two clamping parts and is locked by a nut 3, and is characterized in that a universal joint is provided in the middle of the central axis, and two ends of the universal joint are respectively and movably connected to two pull rods.

[0026] Further, the pull rod is set as a movable bolt 4, one end of the movable bolt 4 is provided with a hole 41 penetrating the side of the pull rod, and the other end is provided with a screw rod. The universal joint is composed of a cross head 5 and a pin shaft 6. The two ends of the cross head 5 are set as spherical surfaces. One spherical surface of the cross head 5 is provided with a first long groove countersunk hole 51, and a first pin hole 52 penetrating the two side walls of the first long groove countersunk hole 51 is provided. The other spherical surface of the cross head 5 is provided with a second long groove countersunk hole 53, and a second pin hole 54 penetrating the two side walls of the second long groove countersunk hole 53. The first long groove countersunk hole 51 and the second long groove countersunk hole 53 are perpendicularly arranged. Take two of the movable bolts 4, and insert one end with the hole 41 into the first long groove countersunk hole 51 and the second long groove countersunk hole 53 at both ends of the cross head 5 respectively. The two pin shafts 6 are respectively arranged in the first pin hole 52 and the second pin hole 54, and respectively pass through the holes 41 of the movable bolts 4. The two movable bolts 4 are movably connected to the universal joint. The other end surface of the lower clamping block 1 is provided with a ball socket 101, and the ball socket 101 is matched with the spherical surfaces at both ends of the cross head 5. The screws of the two movable bolts 4 respectively pass through a group of clamping parts and are locked by the nut 3.

[0027] Furthermore, the ball socket 101 of the lower clamping block 1 is provided with a plurality of pits, and the spherical surfaces at both ends of the crosshead 5 are respectively provided with two or more convex cones 55 , and the convex cones 55 are inserted into the pits to increase the bonding stability between the spherical surface and the ball socket 101 .

[0028] Figure 8~Figure 12 The specific structure of the second embodiment of a universal clamp block for an external fixator of the present invention is shown, wherein the universal clamp block for an external fixator is provided with two clamping parts and a central axis, wherein the clamping part is provided with a penetrating central hole, and each clamping part is provided with a lower clamping block 1 and an upper clamping block 2 respectively, wherein one end face of the upper clamping block 2 is butted against one end face of the lower clamping block 1, and a clamping groove is provided between the butting faces for clamping bone needles or connecting rods, wherein the central axis passes through the central holes of the two clamping parts and is locked by a nut 3, and is characterized in that a universal joint is provided in the middle of the central axis, and two ends of the universal joint are respectively and movably connected to two pull rods.

[0029] Further, the pull rod is set as a ball stud 9, one end of the ball stud 9 is provided with a ball head and the other end is provided with a screw. The universal joint is composed of a first connecting sleeve 7 and a second connecting sleeve 8 connected by threads. One end of the first connecting sleeve 7 is set as a first spherical surface, and the other end is provided with a threaded hole 71. The bottom end of the threaded hole 71 is provided with a first ball socket 72, and a tapered hole open to the outside is provided between the first ball socket 72 and the first spherical surface. The second connecting sleeve 8 is provided with a second spherical surface at one end, and an external thread 81 and an inner hole at the other end. The external thread 81 is matched with the threaded hole 71, and a second ball socket 82 is provided at the bottom of the inner hole. The second ball socket 82 is provided with a tapered hole open to the outside between the second ball socket 82 and the second spherical surface. The ball head of the ball stud 9 is matched with the first ball socket 72 and the second ball socket 82. One ball stud 9 passes through the tapered hole of the first connecting sleeve 7 and a group of clamping parts and is connected to the nut 3. Another ball stud 9 passes through the tapered hole of the second connecting sleeve 8 and another group of clamping parts and is connected to the other nut 3.

[0030] Figure 13~Figure 14 The specific structure of the third embodiment of a universal clamp block for an external fixator of the present invention is shown, wherein the universal clamp block for an external fixator is provided with two clamping parts and a central axis, wherein the two clamping parts are respectively provided as a first clamping part and a second clamping part, wherein the first clamping part is provided with a first lower clamping block 10, wherein a first upper clamping block 11 is provided at the upper end of the first lower clamping block 10, wherein a clamping groove is provided at the joint surface between the first lower clamping block 10 and the first upper clamping block 11 for clamping bone needles or connecting rods, wherein the first lower clamping block 10 is provided with a threaded hole penetrating the upper and lower end surfaces, wherein the upper end surface of the first upper clamping block 11 protrudes upward and is provided with a third spherical surface, wherein the first upper clamping block 11 is provided with a through hole penetrating the upper and lower ends, wherein the second clamping part is provided with a second lower clamping block 12, wherein A second upper clamp block 13 is provided at the upper end of the second lower clamp block 12, and a clamping groove is provided on the joint surface of the second lower clamp block 12 and the second upper clamp block 13 for clamping bone needles or connecting rods. The second clamping portion is provided with a tapered hole running through the upper and lower parts, with the large mouth of the tapered hole facing upward. A third ball socket is provided at the lower end of the second lower clamp block 12 to cooperate with the third spherical surface. A fourth ball socket is provided on the upper end surface of the second upper clamp block 13, and a spherical washer 14 is provided in the fourth ball socket. The central axis is set as a hexagonal flange bolt 15, and the hexagonal flange bolt 15 passes through the spherical washer 14, the second clamping portion and the first upper clamp block 11 in sequence from top to bottom, and is screwed into the threaded hole of the first lower clamp block 10 to tighten the bone needle or connecting rod.

Claims

1. A universal clamp block for an external fixator, comprising two clamping parts and a central axis, wherein the clamping parts are provided with a central hole extending therethrough, each clamping part is provided with a lower clamp block (1) and an upper clamp block (2), one end face of the upper clamp block (2) is butted against one end face of the lower clamp block (1), a clamping groove is provided between the butting surfaces for clamping a bone needle or a connecting rod, the central axis passes through the central holes of the two clamping parts and is locked by a nut (3), wherein: A universal joint is provided in the middle of the central axis, and two ends of the universal joint are movably connected to two pull rods, the pull rod is a movable bolt (4), one end of the movable bolt (4) is provided with a hole (41) penetrating the side of the pull rod, and the other end is provided with a screw rod, the universal joint is composed of a cross head (5) and a pin shaft (6), the two ends of the cross head (5) are spherical surfaces, one spherical surface of the cross head (5) is provided with a first long groove countersunk hole (51), and a first pin hole (52) penetrating the two side walls of the first long groove countersunk hole (51), and the other spherical surface of the cross head (5) is provided with a second long groove countersunk hole (53), and a second pin hole (54) penetrating the two side walls of the second long groove countersunk hole (53). The first long slot countersunk hole (51) and the second long slot countersunk hole (53) are arranged vertically and crosswise, two pieces of the movable bolts (4) are taken, and one end with the hole (41) is respectively inserted into the first long slot countersunk hole (51) and the second long slot countersunk hole (53) at both ends of the crosshead (5), and the two pin shafts (6) are respectively arranged in the first pin hole (52) and the second pin hole (54), and respectively pass through the hole (41) of the movable bolt (4), and the two movable bolts (4) are movably connected to the universal joint, and the other end surface of the lower clamping block (1) is provided with a ball socket (101), and the ball socket (101) is matched with the spherical surface at both ends of the crosshead (5).

2. The universal clamp block of an external fixator according to claim 1, characterized in that: The ball socket (101) of the lower clamping block (1) is provided with a plurality of recessed pits, and the spherical surfaces at both ends of the crosshead (5) are respectively provided with two or more convex cones (55).

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