CN115969495A - Double-rod connecting assembly for sacrum iliac fixation - Google Patents

Abstract

The invention provides a two-rod connection assembly for sacral iliac fixation, comprising: the base part is provided with a base boss on the top surface of the base body of the base part; the connecting seat body is provided with a connecting seat mounting groove; the connecting seat body is provided with a connecting seat axial through hole; the connecting seat body is provided with a connecting seat mounting part; the top of the bearing column body is provided with a rod body accommodating groove; the bearing ball ring can be inserted into the axial through hole of the connecting seat, and the nail body accommodating part extends into the axial through hole of the boss; the positioning connecting seat is provided with a positioning seat mounting groove and a positioning seat axial mounting hole; the two elastic sheets are arranged at the lower part of the pressing body, and the pressing body can be inserted into the axial mounting hole of the positioning seat; the closed connecting seat is provided with an axial mounting hole of the closed seat, and the closed connecting seat is provided with a through ball hole and a through hole of the closed seat. When the sacrum nail and the sacroiliac nail are implanted, the relative angle and distance of the two screws do not need to be considered too much, and the installation of the sacrum nail and the sacroiliac nail and the double-rod connecting assembly can be conveniently and quickly completed.

Description

Double-rod connecting assembly for sacrum ilium fixation

Technical Field

The invention relates to the technical field of medical instruments, in particular to a double-rod connecting assembly for sacrum and ilium fixation.

Background

Distal fixation of adult spinal deformities is a problem in spinal surgery, and in order to obtain more firm support, it is generally necessary to secure a nail-rod system to the ilium or sacroiliac joint. In prior art constructions, the single fixation rod in the longer segment rod fixation system is subjected to large bending moments and torques, and the loss of correction often occurs due to fatigue fracture of the fixation rod. How to design a double-rod connecting component for sacral iliac fixation, which can reduce the rod breaking probability of a fixing rod, is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above-described shortcomings of the prior art, the present invention addresses the technical problem of providing a dual rod connection assembly for sacroiliac fixation that reduces the chance of rod breakage of the fixation rod.

To achieve the above and other related objects, the present invention provides a dual rod connection assembly for sacral iliac fixation, comprising:

the base component comprises a base body and a base rod part connected with the top surface of the base body, wherein a base boss is arranged on the top surface of the base body, a boss axial through hole is arranged on the top surface of the base boss, and a base mounting part is arranged on the base boss; the connecting seat component comprises a connecting seat body and a side rod component connected with the outer side surface of the connecting seat body; a connecting seat mounting groove is formed in the top of the connecting seat body; the top surface of the connecting seat body is provided with a connecting seat axial through hole; the connecting seat body is provided with a connecting seat mounting part connected with the base mounting part, and the connecting seat body and the base body can rotate relatively; the peripheral surface of the side rod piece is provided with an annular positioning groove;

the bearing ball ring comprises a bearing column body and a nail body accommodating part connected with the lower part of the bearing column body, and a rod body accommodating groove is formed in the top of the bearing column body; the bearing ball ring can be inserted into the axial through hole of the connecting seat, and the nail body accommodating part extends into the axial through hole of the boss;

the positioning seat mounting groove is formed in the positioning seat; the top of the positioning connecting seat is provided with an axial positioning seat mounting hole; the positioning connecting seat is provided with a positioning seat blind hole for the side rod piece to be inserted into;

the pressing piece comprises a pressing body and two oppositely arranged elastic sheets, the two elastic sheets are arranged at the lower part of the pressing body, the pressing body can be inserted into the positioning seat axial mounting hole, the pressing body is in clearance fit with the positioning seat axial mounting hole, and the two elastic sheets hold the bottom surface of the annular positioning groove; the positioning connecting seat can swing around a central axis of the positioning seat axial mounting hole, and the positioning connecting seat can drive the pressing piece to rotate around the central axis of the side rod piece;

the top surface of the closed connecting seat is provided with a closed seat axial mounting hole, the closed connecting seat is also provided with a through ball hole, the through ball hole is positioned below the closed seat axial mounting hole, and the side surface of the closed connecting seat is provided with a closed seat through hole;

the supporting ball ring comprises a supporting column body and a nail body accommodating part connected with the lower part of the supporting column body, the rod part of the base can be inserted into the through hole of the closed seat, the nail body accommodating part extends into the through ball hole, and the rod part of the base is in contact with the top surface of the supporting ball ring.

Preferably, the base mounting part is detachably connected with the connecting seat mounting part.

Furthermore, the base boss is cylindrical, the base mounting part comprises a boss groove arranged on the outer side surface of the base boss, two oppositely arranged vertical cutting planes and two base flanges, the two oppositely arranged vertical cutting planes are arranged on the outer side surface of the base boss, and the two oppositely arranged base flanges are formed above the boss groove of the base boss;

the connecting seat mounting part comprises a circular groove, an annular groove and a connecting seat flange which are arranged on the connecting seat body; the circular groove is arranged on the bottom surface of the connecting seat body, the annular groove is arranged along the circumferential direction of the groove side wall of the circular groove, and the lower part of the annular groove forms the connecting seat flange;

a notch is formed in the outer side face of the bottom of the connecting seat body and is communicated with the axial through hole of the connecting seat;

after the two vertical cutting planes enter the circular groove from the notch at the same time, the connecting seat body and the base body are rotated relatively, the two base flanges are inserted into the annular groove, and the two connecting seat flanges are inserted into the boss groove.

Preferably, a limiting part is arranged inside the connecting seat body, and the limiting part limits the angle of relative rotation between the connecting seat body and the base body.

Preferably, the cross section of the base rod part is a right trapezoid, the top surface of the base rod part is arranged along the horizontal direction, the bottom surface of the base rod part is obliquely arranged relative to the horizontal direction, and both side surfaces of the base rod part are perpendicular to the top surface of the base rod part; the top surface of the support ball ring is obliquely arranged relative to the axial direction of the support ball ring.

Preferably, a blocking piece is arranged on one end of the base rod part far away from the base body.

Preferably, the bottom surface of the closed connecting seat is provided with a chute, and the through direction of the chute is obliquely arranged relative to the central axis direction of the axial mounting hole of the closed connecting seat; and a notch part is arranged on the lower bottom surface of the support ball ring.

Preferably, the bearing ball ring is provided with two opposite bulges; two seat body blocking platforms which are oppositely arranged are arranged on the axial through hole of the connecting seat body; when the convex part of the bearing ball ring moves to the position below the seat body blocking table of the connecting seat body, the seat body blocking table blocks the convex part.

Preferably, the nail body accommodating part is a spherical cavity structure with a downward opening, a plurality of accommodating part partition grooves are arranged along the circumferential direction of the inner wall of the nail body accommodating part, and all the accommodating part partition grooves partition the nail body accommodating part into a plurality of elastic accommodating part sheets.

Preferably, the nail body receiving part is a spherical cavity structure with a downward opening, a plurality of receiving part partition grooves are arranged along the circumferential direction of the inner wall of the nail body receiving part, and all the receiving part partition grooves partition the nail body receiving part into a plurality of elastic receiving part sheets.

As described above, the double rod connection assembly for sacral iliac fixation of the present invention has the following advantageous effects:

according to the double-rod connecting assembly for sacrum iliac fixation, the connecting seat mounting groove of the connecting seat body is used for inserting the first fixing rod, and the positioning seat mounting groove of the positioning connecting seat is used for inserting the second fixing rod; the connecting seat body and the base body can rotate relatively, so that the angle between the connecting seat body and the base body can be adjusted; the positioning connecting seat can swing around a central axis of the positioning seat axial mounting hole, the positioning connecting seat can drive the pressing piece to rotate around the central axis of the side rod piece, and the angle between the positioning connecting seat and the connecting seat part can be adjusted; the side surface of the closed connecting seat is provided with a closed seat through hole for inserting the rod part of the base, so that the length between the closed connecting seat and the connecting seat part can be adjusted; so this two stick coupling assembling can realize length adjustment and multi-angle and adjust. The multi-angle adjusting function of the double-rod connecting assembly can be adapted to various cross space positions of the first fixing rod and the second fixing rod, the first fixing rod and the second fixing rod can be conveniently fixed, and operations such as bending and adjusting of the first fixing rod and the second fixing rod are reduced; the nail body accommodating part is used for inserting the sacrum nail, the relative angle and distance of the two screws do not need to be considered too much when the sacrum nail and the sacrum nail are implanted, and the installation of the sacrum nail, the sacrum nail and the double-rod connecting assembly can be conveniently and quickly completed; the double-rod connecting assembly can reduce the rod breaking probability of the fixing rod, save the operation time and reduce the operation damage.

Drawings

Fig. 1 shows a perspective view of a two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 2 is a perspective view of a stop member on a base member of the dual rod connection assembly for sacral iliac fixation of example 1.

Fig. 3 is a schematic perspective view illustrating a stopper provided on a connecting seat member of the dual-rod connecting assembly for sacral iliac fixation in accordance with embodiment 1.

Fig. 4 shows a perspective view of the two-rod connection assembly for sacral iliac fixation of example 1 in a disassembled state.

Fig. 5 shows a side schematic view of a base member of the two rod connection assembly of example 1 for sacral iliac fixation.

Fig. 6 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A of fig. 5.

Fig. 7 shows a top view schematic construction of a base member of the two rod connection assembly for sacral iliac fixation of example 1.

Fig. 8 is a schematic sectional view taken along line B-B of fig. 7.

Fig. 9 shows a schematic view of the structure of the stop pin hole on the base member of the two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 10 shows a schematic view of a connector housing component of the two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 11 shows a bottom structural schematic view of a connector housing component of the two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 12 shows a side view of a connector housing component of the two rod connection assembly for sacral iliac fixation of example 1.

Fig. 13 is a schematic cross-sectional view taken along line C-C of fig. 12. .

Fig. 14 shows a schematic view of a receiving ball ring of the two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 15 is a schematic cross-sectional view taken along line D-D of fig. 14.

Fig. 16 shows a schematic view of a support ball ring of the two rod connection assembly for sacral iliac fixation of example 1.

Fig. 17 is a schematic cross-sectional view taken along line E-E of fig. 16.

Fig. 18 shows a schematic view of the closed connector holder of the two-rod connector assembly for sacral iliac fixation of example 1.

Fig. 19 is a side view of the closed connector block of the two rod connector assembly for sacral iliac fixation of example 1.

Fig. 20 is a schematic sectional view taken along line F-F of fig. 19.

Fig. 21 is a schematic structural view of the closed connection seat of the dual-rod connection assembly for sacral iliac fixation of embodiment 1 with the closed seat through hole.

Fig. 22 shows a schematic view of a sacral nail of the two rod connection assembly of example 1 for sacral iliac fixation.

Fig. 23 shows a schematic view of a sacroiliac nail of the two-rod connection assembly for sacroiliac fixation of example 1.

Fig. 24 is a schematic view showing the structure of the positioning connection socket of the two-rod connection assembly for sacral iliac fixation of example 1.

Fig. 25 is a side view of the alignment coupler socket of the two-rod coupling assembly for sacral iliac fixation of example 1.

FIG. 26 is a schematic sectional view taken along line G-G of FIG. 25.

FIG. 27 is a schematic sectional view taken along line H-H of FIG. 25.

Fig. 28 is a schematic structural view illustrating the positioning seat mounting groove formed in the positioning connection seat of the dual rod connection assembly for sacral iliac fixation in accordance with embodiment 1.

Fig. 29 is a perspective view of a compression member of the dual rod connection assembly for sacral iliac fixation of example 1.

Fig. 30 shows a side view of a compression member of the two rod connection assembly for sacral iliac fixation of example 1.

FIG. 31 is a schematic sectional view taken along line I-I of FIG. 30.

Fig. 32 shows a perspective view of the base member of the two-rod connection assembly for sacral iliac fixation of example 1 with two vertical cut planes aligned with the cut-outs of the connector seat body.

Fig. 33 is a perspective view of the base boss of the two-bar connection assembly for sacral iliac fixation of example 1 inserted into the connection seat mounting portion of the connection seat body.

Fig. 34 shows a perspective view of the two base flanges of the two-rod connection assembly for sacral iliac fixation of example 1 inserted into the annular groove and the two connection seat flanges inserted into the boss groove.

Fig. 35 is a schematic structural view of the installation stop of the two-rod connection assembly for sacral iliac fixation of embodiment 1.

Fig. 36 shows the inner structure of the connecting socket body and the base body of the dual-rod connecting assembly for sacral iliac fixation of embodiment 1 when they are rotated relatively to two extreme positions.

Fig. 37 is a schematic view showing the structure of the guide slot of the receiving ball ring of the two-rod connection assembly for sacral iliac fixation of embodiment 1 aligned with the retainer table of the connection seat member.

Fig. 38 is a schematic view of the receiving ball ring of the two-bar connection assembly for sacral iliac fixation of example 1 pressed down to the projection below the seat block.

Fig. 39 is an enlarged schematic view of the structure at K in fig. 38.

Fig. 40 is a schematic view showing the structure of the side rod piece of the connecting seat part of the double-rod connecting assembly for sacral iliac fixation in the embodiment 1 when the side rod piece is aligned with the positioning seat blind hole of the positioning seat.

Fig. 41 shows a schematic view of the structure of the side pole piece of the connecting seat part of the double-rod connecting assembly for sacral iliac fixation of the embodiment 1 when inserted into the blind hole of the positioning seat.

Fig. 42 is a schematic view of the alignment coupler socket of the dual rod coupling assembly for sacral iliac fixation of example 1 as it swings about a central axis of the alignment socket axial mounting hole.

FIG. 43 is a schematic cross-sectional view taken along line O-O of FIG. 42.

Fig. 44 is an enlarged view of the structure at L in fig. 43.

Fig. 45 is a schematic cross-sectional view of the side post member of the connecting seat member of the two-post connection assembly for sacral iliac fixation of example 1 inserted into the locating seat blind hole of the locating seat.

Fig. 46 is a schematic view of the alignment of the base shaft portion of the base member of the dual rod connection assembly for sacral iliac fixation of example 1 with the closed base through-hole.

Fig. 47 is a schematic view showing the structure of example 1 in which the base shaft of the base member of the two-rod coupling assembly for sacral iliac fixation is inserted into the closed-base through-hole.

Fig. 48 is a cross-sectional view of the sacral nail of example 1 with the head pressed into the body receiving portion of the receiving ball.

Fig. 49 is a cross-sectional view of the flexible receiving plate of the dual rod connection assembly for sacral iliac fixation of example 1 wrapping the head of a sacral nail.

Fig. 50 is a cross-sectional view of the nail body receiving portion of the ball receiving ring of the two-rod connection assembly for sacral iliac fixation of example 1 pressing against the boss ball hole portion.

Fig. 51 is a cross-sectional view of the sacroiliac nail of example 1 as the head is pressed into the body receptacle of the support ball.

Fig. 52 is a cross-sectional view of the flexible receiving member of the dual rod connection assembly for sacroiliac fixation of example 1 wrapping the head of a sacroiliac nail.

Fig. 53 is a cross-sectional view of the tack body receptacle of the support ball ring of the two-rod connection assembly for sacral iliac fixation of example 1 compressed through the ball hole.

Fig. 54 is a schematic view showing the structure of the sacroiliac nail implanted in the sacrum and the ilium, and the sacral nail implanted in the sacrum in example 1.

Fig. 55 shows a schematic view of the sacroiliac nail implanted in the closed junction box of the two-rod connection assembly for sacroiliac fixation of example 1.

Fig. 56 is a schematic view showing a configuration of sacral pegs implanted in a connector block member of the dual rod connection assembly for sacral iliac fixation of example 1.

Fig. 57 shows a schematic view of the two-rod connection assembly for sacral iliac fixation of example 1 with the first and second fixation rods installed thereon.

Fig. 58 shows a perspective view of the two rod connection assembly of example 2 for sacral iliac fixation.

Description of the reference numerals

101. Base member 1001, base body 1002, and base boss

1003. Base mounting part 1004, boss axial through hole 1011 and boss groove

1012. Base flange 1013, vertical cutting plane 1014, base stem

10141. The top surface 10142 of the base rod part, the bottom surface 1015 of the base rod part and the round hole part at the upper part of the boss

1016. Boss ball hole portion 1017, boss lower circular hole portion 1018 and stop pin hole

102. Connecting seat component 10200, connecting seat body 1020, spacing installation through-hole

1200. Connecting seat mounting part 1021, connecting seat mounting groove 1022 and connecting seat axial through hole

1023. Connecting seat internal thread 1024, seat body block table 1025 and circular groove

1026. Annular groove 1027, connecting seat flange 1028 and notch

1029. Side rod 10291, annular positioning groove 10292 and first groove wall surface

10293. Second groove wall surface

103. Receiving ball ring 1030, receiving part recess 1031, receiving cylinder

1032. Outer side surface 1033, limit groove 1034 and guide groove of nail body accommodating part

1035. A rod body receiving groove 1036, a protrusion 1037, and a receiving axial through hole

1038. Nail body storage part 1039, storage part partition groove

104. Supporting ball ring 1041, supporting column 1042 and outer side surface of nail body accommodating part

1043. Top surface 1044 for supporting ball ring, nail body accommodating part 1045 and accommodating part partition groove

1046. Accommodating portion recess 1047, notch portion

105. Closed connecting seat 1051, closed seat mounting thread 1052 and closed seat axial mounting hole

1053. Closed base middle cylindrical hole 1054, closed base through hole 1055, inclined groove

1056. Closed base bottom cylindrical hole 1057, through ball hole

106. Stopper 107, stopper

108. Sacral nail 1081, head 1082 of the sacral nail, first drive slot

1083. First nail body notch 1084 and first bone thread

109. Sacroiliac nail 1091, nail head 1092 of sacroiliac nail, second driving groove

1093. Second nail body cutting groove 1094 and second bone screw thread

110. Positioning connecting seat 1101, positioning seat axial mounting hole 1102 and positioning seat internal thread

1103. Positioning seat mounting groove 1104 and positioning seat blind hole

111. Pressing piece 1111, pressing body 1112 and pressing part groove

1113. Groove bottom surface 1114 of pressing part groove, radial through hole 1115 of pressing part and through groove

1116. Arc side groove 1117, spring 1118 and bulge

112. A screw plug 113, a first fixing rod 114 and a second fixing rod

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to the drawings. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.

Example 1

As shown in fig. 1-7, the dual rod connection assembly for sacral iliac fixation of the present embodiment comprises:

the base comprises a base part 101, a base body 1001 and a base rod part 1014 connected with the top surface of the base body 1001, wherein the top surface of the base body 1001 is provided with a base boss 1002, the top surface of the base boss 1002 is provided with a boss axial through hole 1004, and the base boss 1002 is provided with a base mounting part 1003;

as shown in fig. 1, 4, 10 to 13, the docking station component 102 includes a docking station body 10200 and a side bar element 1029 connected to an outer side surface of the docking station body 10200; a connecting seat mounting groove 1021 is formed in the top of the connecting seat body 10200; a connecting seat axial through hole 1022 is formed in the top surface of the connecting seat body 10200; the connecting seat body 10200 is provided with a connecting seat mounting part 1200 connected with the base mounting part 1003, and the connecting seat body 10200 and the base body 1001 can rotate relatively; an annular positioning groove 10291 is arranged on the outer peripheral surface of the side rod piece 1029;

as shown in fig. 1, 4, 14 and 15, the receiving ball ring 103 includes a receiving cylinder 1031 and a nail receiving portion 1038 connected to a lower portion of the receiving cylinder 1031, and a rod receiving groove 1035 is formed at a top portion of the receiving cylinder 1031; the receiving ball ring 103 can be inserted into the connecting seat axial through hole 1022, the nail body receiving portion 1038 extends into the boss axial through hole 1004, and the nail body receiving portion 1038 is used for inserting the sacral nail 108;

as shown in fig. 1, 4, 24 to 28, the positioning seat connecting base 110 is provided with a positioning seat mounting groove 1103 on the positioning seat connecting base 110; a positioning seat axial mounting hole 1101 is formed in the top of the positioning connecting seat 110; a positioning seat blind hole 1104 for inserting the side rod element 1029 is arranged on the positioning connecting seat 110;

as shown in fig. 1, 4, and 29 to 31, the pressing member 111 includes a pressing body 1111 and two opposite resilient sheets 1117, the two resilient sheets 1117 are disposed at a lower portion of the pressing body 1111, the pressing body 1111 can be inserted into the positioning seat axial mounting hole 1101, the pressing body 1111 is in clearance fit with the positioning seat axial mounting hole 1101, and the two resilient sheets 1117 embrace the groove bottom surface of the annular positioning groove 10291; the positioning connecting base 110 can swing around the central axis of the positioning base axial mounting hole 1101, and the positioning connecting base 110 can drive the pressing piece 111 to rotate around the central axis of the side bar piece 1029; the angle N in fig. 42 is the angle at which the alignment coupler socket 110 swings to two extreme positions about the central axis of the alignment coupler axial mounting hole 1101; the arrow M in fig. 43 is the rotation direction of the positioning connection seat 110 driving the pressing member 111 to rotate around the central axis of the side link 1029;

as shown in fig. 1, 4, 18 to 21, the closed connecting seat 105 is provided with a closed seat axial mounting hole 1052 on the top surface of the closed connecting seat 105, the closed connecting seat 105 is further provided with a through ball hole 1057, the through ball hole 1057 is located below the closed seat axial mounting hole 1052, and the side surface of the closed connecting seat 105 is provided with a closed seat through hole 1054 for inserting the base rod part 1014;

as shown in fig. 1, 4, 16 and 17, the support ball loop 104 includes a support cylinder 1041 and a spike receiving portion 1044 connected to a lower portion of the support cylinder 1041, the base stem 1014 is insertable into the closed seat throughbore 1054, the spike receiving portion 1044 extends into the throughbore 1057, the spike receiving portion 1044 is insertable into the sacroiliac nail 109, and the base stem 1014 is in contact with a top surface 1043 of the support ball loop.

As shown in fig. 1, 4, 40 to 57, in the dual rod connection assembly for sacral iliac fixation of the present invention, the connection seat mounting groove 1021 of the connection seat body 10200 is inserted by the first fixing rod 113, and the positioning seat mounting groove 1103 of the positioning connection seat 110 is inserted by the second fixing rod 114; the connecting seat body 10200 and the base body 1001 can rotate relatively, so that the angle between the connecting seat body 10200 and the base body 1001 can be adjusted; the positioning connecting base 110 can swing around the central axis of the positioning base axial mounting hole 1101, the positioning connecting base 110 can drive the pressing piece 111 to rotate around the central axis of the side bar piece 1029, and the angle between the positioning connecting base 110 and the connecting base part 102 can be adjusted; a closed base through hole 1054 for inserting the base rod 1014 is formed on the side surface of the closed base 105, so that the distance between the closed base 105 and the base member 102 can be adjusted; so this two stick coupling assembling can realize length adjustment and multi-angle and adjust. The multi-angle adjustment function of the double-rod connecting assembly can be adapted to various cross space positions of the first fixing rod 113 and the second fixing rod 114, so that the first fixing rod 113 and the second fixing rod 114 can be conveniently fixed, and operations such as bending and adjusting the first fixing rod 113 and the second fixing rod 114 are reduced; the nail body accommodating part 1038 is used for inserting the sacrum nail 108, the nail body accommodating part 1044 is used for inserting the sacrum nail 109, the relative angle and distance of the two screws are not excessively considered when the sacrum nail 108 and the sacrum nail 109 are implanted, and the installation of the sacrum nail 108, the sacrum nail 109 and the double-rod connecting assembly can be conveniently and quickly completed; this two excellent coupling assembling can reduce the disconnected excellent probability of fixed stick, can practice thrift operation time, reduce the operation damage.

As shown in fig. 13 and 38, the base mounting portion 1003 and the docking base mounting portion 1200 are detachably connected to each other in order to facilitate the manufacturing of the base mounting portion 1003 and the docking base mounting portion 1200. As shown in fig. 10, 12, 26 and 57, in order to make the structure more compact, the axial direction of the connecting holder body 10200 is perpendicular to the axial direction of the side lever member 1029. To facilitate the installation of the first fixing bar 113, the connecting seat mounting groove 1021 is recessed downward from the top of the connecting seat body 10200 and radially penetrates the connecting seat body 10200. To facilitate the installation of the second fixing bar 114, the aligning seat installation groove 1103 is recessed downward from the top of the aligning seat 110 and penetrates the aligning seat 110 in a radial direction. As shown in fig. 13, 26 and 57, in order to facilitate the installation of the screw plug 112, the upper portion of the connecting seat axial through hole 1022 is provided with a connecting seat internal thread 1023, and the upper portion of the positioning seat axial installation hole 1101 is provided with a positioning seat internal thread 1102.

As shown in fig. 1, 4 to 13, and 38, the base boss 1002 is cylindrical, the base mounting portion 1003 includes a boss recess 1011 disposed on an outer side surface of the base boss 1002, two oppositely disposed vertical cut planes 1013 disposed on the outer side surface of the base boss 1002, and two base flanges 1012, the two oppositely disposed vertical cut planes 1013 form two base flanges 1012 above the boss recess 1011 of the base boss 1002;

the coupler socket mounting portion 1200 includes a circular groove 1025, an annular groove 1026 and a coupler socket flange 1027 provided on the coupler socket body 10200; a circular groove 1025 is provided on the bottom surface of the connecting holder body 10200, an annular groove 1026 is provided along the circumferential direction of the groove side wall of the circular groove 1025, and a lower portion of the annular groove 1026 forms a connecting holder flange 1027; a notch 1028 is formed in the outer side surface of the bottom of the connecting seat body 10200, and the notch 1028 is communicated with the connecting seat axial through hole 1022;

after the two vertical cutting planes 1013 enter the circular groove 1025 from the cut 1028 at the same time, the connecting seat body 10200 and the base body 1001 are rotated relatively, the two base flanges 1012 are inserted into the annular groove 1026, and the two connecting seat flanges 1027 are inserted into the boss groove 1011. This compact structure, and the installation and the dismantlement of pedestal mounting portion 1003 and connecting seat installation department 1200 are convenient for.

The boss axial through hole 1004 comprises a boss upper circular hole portion 1015, a boss spherical hole portion 1016 and a boss lower circular hole portion 1017 which are sequentially communicated from top to bottom; the boss upper circular hole portion 1015 has a diameter larger than that of the boss lower circular hole portion 1017, and the boss ball hole portion 1016 supports the nail body receiving portion 1038 that receives the ball 103. Since the head 1081 of the sacral nail is a ball head, the arrangement of the circular hole portion 1017 at the lower portion of the boss facilitates the head 1081 of the sacral nail to be placed in the nail body receiving portion 1038.

As shown in fig. 3 to 5, 10, 12, and 32 to 36, a limiting member 107 is disposed inside the connecting base body 10200, and the limiting member 107 limits the relative rotation angle between the connecting base body 10200 and the base body 1001. The limiting member 107 has a simple structure, and the limiting member 107 is disposed to limit the relative rotation angle between the connecting base body 10200 and the base body 1001. In this embodiment, the number of the limiting members 107 is two, fig. 36 is a schematic view of the connecting base body 10200 and the base body 1001 rotating to two limit positions, and an included angle between the two limit positions reached by the relative rotation between the connecting base body 10200 and the base body 1001 is an angle J.

The cross section of the connecting seat mounting groove 1021 is of a U-shaped structure; the cross section of the connecting seat mounting groove 1021 is a structure which is symmetrically arranged by taking a connecting seat middle plane of the connecting seat body 10200 as a middle axial plane, and a central axis of the connecting seat body 10200 penetrates through the connecting seat middle plane. The two limiting parts 107 are symmetrically arranged by taking the middle plane of the connecting seat as a middle axial plane; the two maximum angles of the back-and-forth swing between the connecting jack body 10200 and the base body 1001 are the same with respect to the initial state when there is no swing between the connecting jack body 10200 and the base body 1001.

As shown in fig. 10 to 12 and 36, in order to make the structure more compact, the penetrating direction of the connecting seat mounting groove 1021 is the same as the extending direction of the notch 1028, and the penetrating direction of the connecting seat mounting groove 1021 is perpendicular to the axial direction of the side bar 1029. The annular positioning groove 10291 has two oppositely disposed first and second groove wall surfaces 10292 and 10293.

Be equipped with spacing installation through-hole 1020 on the tank bottom surface of annular groove 1026, be provided with locating part 107 in the spacing installation through-hole 1020, this simple structure is convenient for locating part 107's installation.

As shown in fig. 5, 6, 29 to 31, 46 to 47, the cross section of the base rod 1014 is a right trapezoid, the top surface 10141 of the base rod is arranged along the horizontal direction, the bottom surface 10142 of the base rod is arranged obliquely with respect to the horizontal direction, and both side surfaces of the base rod 1014 are perpendicular to the top surface 10141 of the base rod; the top surface of the pressing body 1111 is disposed obliquely with respect to the axial direction of the pressing body 1111. When the base rod 1014 is inserted into the through hole 1054 of the closed seat and the bottom surface 10142 of the base rod presses the top surface of the pressing body 1111, the support ball 104 cannot rotate in the closed seat 105, and the position of the support ball 104 is stable.

As shown in fig. 2, 6, 9 and 47, the end of the base plate stem 1014 distal from the base plate body 1001 is provided with a stop 106. The stop 106 is provided to prevent the base stem 1014 from separating from the base body 1001. The end of the base plate stem 1014 remote from the base plate body 1001 is provided with a stop pin aperture 1018 into which the stop 106 can fit.

As shown in fig. 16 to 20 and 51, the bottom surface of the closed connecting seat 105 is provided with an inclined groove 1055, and the penetrating direction of the inclined groove 1055 is inclined relative to the central axis direction of the axial mounting hole 1052 of the closed connecting seat; the bottom surface of the support ball 104 is provided with a notch 1047. When the support ball ring 104 is inserted into the closed connector socket 105 and the angled slot 1055 of the closed connector socket 105 is aligned with the notch 1047 of the support ball ring 104, the sacroiliac nail 109 can be easily inserted into the support ball ring 104.

As shown in fig. 12 to 15 and 37 to 39, the receiving ball ring 103 is provided with two oppositely arranged protruding portions 1036; two seat body blocking platforms 1024 which are arranged oppositely are arranged on a connecting seat axial through hole 1022 of the connecting seat body 10200; when the protrusion 1036 of the receiving ball ring 103 moves below the seat block 1024 of the connecting seat body 10200, the seat block 1024 blocks the protrusion 1036. This configuration allows the retainer block 1024 to limit the upward travel of the receiving ball 103 when the lower portion of the receiving ball 103 is pressed upward.

The receiving cylinder 1031 receiving the ball 103 is cylindrical and the pin receiver 1038 is spherical. For convenience of processing, the receiving cylinder 1031 is provided with two symmetrically arranged limiting grooves 1033, the receiving cylinder 1031 is further provided with two symmetrically arranged guide grooves 1034, the lower part of each limiting groove 1033 is provided with an upper part of one guide groove 1034, and a bulge 1036 is formed between each limiting groove 1033 and the guide groove 1034 below the limiting groove; the protrusion 1036 may be annular. The two limiting grooves 1033 of the receiving ball ring 103 are symmetrically arranged by taking the receiving middle surface of the receiving ball ring 103 as a middle axial surface, and the middle axial surface of the receiving ball ring 103 passes through the receiving middle surface. The rod receiving grooves 1035 are symmetrically arranged on the receiving intermediate surface of the receiving ball ring 103. The receiving ball ring 103 is also provided with a receiving axial through hole 1037.

The nail body housing section 1038 has a spherical cavity structure with a downward opening, a plurality of housing section grooves 1039 are provided along the circumferential direction of the inner wall of the nail body housing section 1038, and all of the housing section grooves 1039 divide the nail body housing section 1038 into a plurality of elastic housing section pieces. This structure enables the nail body receiving portion 1038 to hold the inserted sacral nail 108.

As shown in fig. 15, 22, 48-50, the nail body receiving portion 1038 is provided with a receiving portion recess 1030 on an inner side surface thereof, the receiving portion recess 1030 is disposed around an axial direction of the nail body receiving portion 1038, and a first driving groove 1082 is provided on a top surface of the head 1081 of the sacral nail 108. The head 1081 of the sacral nail 108 is provided with a plurality of first body slots 1083 disposed in an axial sequence. When the head 1081 of the sacral nail 108 is inserted into the nail body receiver 1038, edges of the first nail body slot 1083 can contact the receiver recess 1030 to increase friction between the nail body receiver 1038 and the head 1081 of the sacral nail 108. A first bone thread 1084 is provided on the body of the sacral nail 108.

As shown in fig. 22 and 23, the length of the sacroiliac nail 109 is greater than the length of the sacral nail 108, and the diameter of the sacroiliac nail 109 is greater than the diameter of the sacral nail 108.

As shown in fig. 16 and 17, the nail body housing 1044 is a spherical cavity structure with a downward opening, a plurality of housing part partitions 1045 are provided along the circumference of the inner wall of the nail body housing 1044, and all the housing part partitions 1045 divide the nail body housing 1044 into a plurality of elastic housing part sheets. This configuration enables the tack body receptacle 1044 to hold an inserted sacroiliac tack 109.

As shown in fig. 16, 23, and 51-53, the support cylinder 1041 supporting the ball ring 104 is cylindrical and the spike housing 1044 is spherical. A receiving portion recess 1046 is formed on an inner side surface of the nail body receiving portion 1044, and the receiving portion recess 1046 is arranged around an axial direction of the nail body receiving portion 1044. A second drive slot 1092 is provided on a top surface of the nail head 1091 of the sacroiliac nail 109. The head 1091 of the sacroiliac nail 109 is provided with a plurality of second nail body cutting grooves 1093 which are arranged in sequence along the axial direction. When the head 1091 of the sacroiliac nail 109 is inserted into the shank pocket 1044, the edges of the second shank slot 1093 contact the pocket recess 1046 to increase the friction between the shank pocket 1044 and the head 1091 of the sacroiliac nail 109. The notch 1047 is an arc-shaped structure, and the notch 1047 may be a symmetrical structure. A second bone thread 1094 is arranged on the nail body of the sacroiliac nail 109.

As shown in fig. 4 and 18 to 21, in order to facilitate the installation of the support ball ring 104, a closed seat bottom cylindrical hole 1056 is provided on the bottom surface of the closed seat base 105, the closed seat bottom cylindrical hole 1056 is located below the through ball hole 1057, and a closed seat middle cylindrical hole 1053 is further provided between the through ball hole 1057 and the closed seat axial mounting hole 1052. The closed seat through hole 1054 is a square hole. The extending direction of the closed seat through hole 1054 intersects the penetrating direction of the inclined groove 1055. The closed seat axial mounting hole 1052 is provided with a closed seat mounting thread 1051.

As shown in fig. 12, 29 to 31, the pressing member 111 is cylindrical, two pressing portion grooves 1112 arranged oppositely are formed on the outer side surface of the pressing member 111, and the extending direction of the pressing portion grooves 1112 is perpendicular to the axial direction of the pressing member 111. Each pressing part groove 1112 penetrates through the bottom surface of the pressing piece 111, and the groove bottom surface 1113 of each pressing part groove is a plane; the groove bottom 1113 of the pressing part groove is provided with a pressing part radial through hole 1114, and the cross section of the pressing part radial through hole 1114 is arc-shaped. The groove bottom 1113 of the pressing part groove is also provided with two arc-shaped side grooves 1116, the two arc-shaped side grooves 1116 are respectively positioned at two sides of the radial through hole 1114 of the pressing part, and the extension direction of the arc-shaped side grooves 1116 is the same as that of the radial through hole 1114 of the pressing part. A spring 1117 is formed between each arcuate side groove 1116 and the pinch portion radial through hole 1114. The joint of the two elastic sheets 1117 is a middle joint part, and a plurality of through grooves 1115 are arranged on the bottom surface of the middle joint part. The two resilient pieces 1117 are provided with protrusions 1118 on opposite sides. The two resilient tabs 117 are clasped to the bottom surface of the annular positioning groove 10291 by the protrusions 1118. The arrangement of the through grooves 1115 is favorable for the two elastic sheets 1117 to hold the annular positioning groove 10291. The two elastic sheets 1117 are arc-shaped.

The invention discloses an installation method of a double-rod connecting assembly, which comprises the following steps:

as shown in fig. 5 to 13, 38, and 32 to 36, 1) after aligning the two vertical cutting planes 1013 of the base part 101 with the cutouts 1028 of the connecting jack body 10200, inserting the base bosses 1002 into the connecting jack mounting part 1200 of the connecting jack body 10200, rotating 90 ° counterclockwise, inserting the two base flanges 1012 into the annular grooves 1026, inserting the two connecting jack flanges 1027 into the boss grooves 1011, and then mounting the position-limiting members 107;

because the limiting piece 107 blocks the connecting seat part 102 from rotating clockwise by 90 degrees to a disengaging position, the connecting seat part 102 and the base part 101 are coaxially buckled together and can relatively rotate by a certain angle;

as shown in fig. 10 to 15 and fig. 37 to 39, 2) aligning the guiding groove 1034 of the receiving ball ring 103 with the seat body stopping platform 1024 of the connecting seat component 102, pressing down the receiving ball ring 103 until the protrusion 1036 is located below the seat body stopping platform 1024, at this time, under normal circumstances, the receiving ball ring 103 can only move in the axial direction and cannot be removed from the connecting seat component 102, in the axial direction, due to the mutual restriction of the limiting groove 1033 and the seat body stopping platform 1024, the receiving ball ring 103 and the connecting seat component 102 are relatively fixed, and the receiving ball ring 103 can rotate with the connecting seat component 102 for a certain angle;

as shown in fig. 11 to 12, 24 to 31, and 40 to 45, 3) the positioning seat blind hole 1104 of the positioning connecting seat 110 is matched with the side rod piece 1029 of the connecting seat component 102, then the pressing piece 111 is installed along the positioning seat axial mounting hole 1101, the pressing part radial through hole 1114 formed between the two elastic pieces 1117 is clamped on the annular positioning groove 10291, at this time, the two elastic pieces 1117 are symmetrically opened, the protruding piece 1118 embraces the side rod piece 1029, and the pressing piece 111 cannot be pulled out along the axial direction of the positioning seat axial mounting hole 1101; the two pressing portion grooves 1112 are respectively attached to a first groove wall surface 10292 and a second groove wall surface 10293 of the annular positioning groove 10291; the groove bottom surfaces 1113 of the two pressing part grooves are respectively attached to a first groove wall surface 10292 and a second groove wall surface 10293 of the annular positioning groove 10291; effecting a blocking of relative movement between the components in the axial direction of the side lever member 1029; at this time, the positioning connecting base 110 can swing around the central axis of the positioning base axial mounting hole 1101, and the positioning connecting base 110 can drive the pressing piece 111 to rotate around the central axis of the side bar piece 1029;

as shown in fig. 11 to 12, 24 to 31, and 46 to 47, 4) the outer side surface of the support ball ring 104 is fitted into the axial installation hole 1052 of the closed seat, the notch 1047 and the inclined groove 1055 are adjusted to the same side, then the base rod 1014 of the base member 101 is inserted into the through hole 1054 of the closed seat, the bottom surface 10142 of the base rod presses the top surface 1043 of the support ball ring, and the upper plane of the through hole 1054 of the closed seat is parallel to the top surface 10141 of the base rod; the stop 106 is then installed in the stop pin aperture 1018;

as shown in fig. 13, 20, 26, 22, 23, 48 to 57, 5) the nail head 1091 of the sacroiliac nail 109 implanted in the sacrum and the ilium is pressed into the nail body accommodating part 1044 of the support ball ring 104, and then slid along the base rod part 1014 for adjustment in length and at the same time for adjustment in angle, the nail head 1091 of the sacroiliac nail 109 will support the ball ring 104 to the top; continuously exerting force, the nail head 1091 of the sacroiliac nail 109 supports the elastic containing part sheet body of the nail body containing part 1044 of the ball ring 104 to be opened, the elastic containing part sheet body wraps the nail head 1091 of the sacroiliac nail 109, after the sacroiliac nail 109 is finally locked, the nail body containing part 1044 of the sacroiliac nail 104 is tightly pressed to penetrate through the ball hole 1057, and the sacroiliac nail 109 can obtain a larger moving angle in the directions of the inclined groove 1055 and the gap 1047; the outer side surface 1042 of the nail body accommodating part is a spherical surface, and the structure is convenient for the nail body accommodating part 1044 to tightly press through the ball hole 1057;

pressing the nail head 1081 of the sacral nail 108 implanted into the sacrum into the nail body receiving part 1038 for receiving the ball ring 103, and when the sacral nail 108 is pressed tightly by force, the nail head 1081 of the sacral nail 108 pushes the receiving ball ring 103 upwards; continuing to exert force, the pin head 1081 of the sacral nail 108 props up the elastic receiving part sheet body of the pin body receiving part 1038 for receiving the ball ring 103, the elastic receiving part sheet body wraps the pin head 1081 of the sacral nail 108, and after final locking, the pin body receiving part 1038 for receiving the ball ring 103 presses the convex billiard hole part 1016; the outer side surface 1032 of the nail body receiving part is a spherical surface, and the structure is convenient for the nail body receiving part 1038 to press the convex billiard hole part 1016;

6) Connecting the first fixing bar 113 and the second fixing bar 114 extending proximally, the first fixing bar 113 being inserted into the connecting socket mounting groove 1021 of the connecting socket body 10200, the second fixing bar 114 being inserted into the positioning socket mounting groove 1103 of the positioning connecting socket 110; the screw plug 112 is arranged in the axial through hole 1022 of the connecting seat, and the screw plug 112 presses the first fixing rod 113 to lock the first fixing rod 113; the screw plug 112 is arranged in the positioning seat axial installation hole 1101, and the screw plug 112 presses the second fixing rod 114 to lock the second fixing rod 114; the plug screw 112 is installed in the obturator connecting seat 105, and the plug screw 112 presses the base plate stem 1014 to lock the base plate stem 1014.

In this embodiment, the double-rod connecting assembly is installed on the right side of the human body, so the double-rod connecting assembly is a right side assembly.

Example 2

As shown in fig. 58, the present embodiment is different from embodiment 1 in that the dual stick attachment assembly is installed at the left side of the human body, so the dual stick attachment assembly is a left side assembly.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A dual rod connection assembly for sacral iliac fixation, comprising:

the base component (101) comprises a base body (1001) and a base rod part (1014) connected with the top surface of the base body (1001), wherein a base boss (1002) is arranged on the top surface of the base body (1001), a boss axial through hole (1004) is arranged on the top surface of the base boss (1002), and a base mounting part (1003) is arranged on the base boss (1002); a connecting seat part (102) comprising a connecting seat body (10200) and a side lever part (1029) connected with an outer side face of the connecting seat body (10200); a connecting seat mounting groove (1021) is formed in the top of the connecting seat body (10200); a connecting seat axial through hole (1022) is formed in the top surface of the connecting seat body (10200); the connecting seat body (10200) is provided with a connecting seat mounting part (1200) connected with the base mounting part (1003), and the connecting seat body (10200) and the base body (1001) can rotate relatively; an annular positioning groove (10291) is formed in the outer peripheral surface of the side rod piece (1029);

the receiving ball ring (103) comprises a receiving cylinder (1031) and a nail body receiving part (1038) connected with the lower part of the receiving cylinder (1031), and a rod body receiving groove (1035) is formed in the top of the receiving cylinder (1031); the bearing ball ring (103) can be inserted into the connecting seat axial through hole (1022), and the nail body receiving part (1038) extends into the boss axial through hole (1004);

the positioning device comprises a positioning connecting seat (110), wherein a positioning seat mounting groove (1103) is formed in the positioning connecting seat (110); the top of the positioning connecting base (110) is provided with an axial positioning base mounting hole (1101); a positioning seat blind hole (1104) for the side rod piece (1029) to be inserted into is formed in the positioning connecting seat (110);

the pressing piece (111) comprises a pressing body (1111) and two oppositely arranged elastic sheets (1117), the two elastic sheets (1117) are arranged at the lower part of the pressing body (1111), the pressing body (1111) can be inserted into the positioning seat axial installation hole (1101), the pressing body (1111) is in clearance fit with the positioning seat axial installation hole (1101), and the two elastic sheets (1117) clasp the groove bottom surface of the annular positioning groove (10291); the positioning connecting seat (110) can swing around a central axis of the positioning seat axial mounting hole (1101), and the positioning connecting seat (110) can drive the pressing piece (111) to rotate around the central axis of the side rod piece (1029);

the sealing device comprises a closed connecting seat (105), wherein a closed seat axial mounting hole (1052) is formed in the top surface of the closed connecting seat (105), a through ball hole (1057) is further formed in the closed connecting seat (105), the through ball hole (1057) is located below the closed seat axial mounting hole (1052), and a closed seat through hole (1054) is formed in the side surface of the closed connecting seat (105); the supporting ball ring (104) comprises a supporting cylinder (1041) and a nail body accommodating part (1044) connected with the lower part of the supporting cylinder (1041), the base rod part (1014) can be inserted into the through hole (1054) of the closed seat, the nail body accommodating part (1044) extends into the through ball hole (1057), and the base rod part (1014) is in contact with the top surface of the supporting ball ring (104).

2. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: the base installation part (1003) is detachably connected with the connecting seat installation part (1200).

3. A two-rod connection assembly for sacral iliac fixation as recited in claim 2, wherein:

the base boss (1002) is cylindrical, the base mounting part (1003) comprises a boss groove (1011) arranged on the outer side surface of the base boss (1002), two oppositely arranged vertical cutting planes (1013) and two base flanges (1012), the two oppositely arranged vertical cutting planes (1013) are arranged on the outer side surface of the base boss (1002), and the two oppositely arranged base flanges (1012) are formed above the boss groove (1011) of the base boss (1002);

the connecting seat mounting part (1200) comprises a circular groove (1025), an annular groove (1026) and a connecting seat flange (1027), wherein the circular groove (1025), the annular groove and the connecting seat flange are arranged on the connecting seat body (10200); the circular groove (1025) is provided on a bottom surface of the connector holder body (10200), the annular groove (1026) is provided along a circumferential direction of a groove side wall of the circular groove (1025), a lower portion of the annular groove (1026) forms the connector holder flange (1027);

a notch (1028) is formed in the outer side face of the bottom of the connecting seat body (10200), and the notch (1028) is communicated with the connecting seat axial through hole (1022);

after the two vertical cutting planes (1013) enter the circular groove (1025) from the cut (1028) at the same time, the connecting seat body (10200) and the base body (1001) are rotated relatively, the two base flanges (1012) are inserted into the annular groove (1026), and the two connecting seat flanges (1027) are inserted into the boss groove (1011).

4. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: a limiting piece (107) is arranged inside the connecting seat body (10200), and the limiting piece (107) limits the relative rotation angle between the connecting seat body (10200) and the base body (1001).

5. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein:

the cross section of the base rod part (1014) is in a right trapezoid shape, the top surface (10141) of the base rod part is arranged along the horizontal direction, the bottom surface (10142) of the base rod part (1014) is obliquely arranged relative to the horizontal direction, and two side surfaces of the base rod part (1014) are perpendicular to the top surface (10141) of the base rod part;

the top surface of the support ball ring (104) is arranged obliquely relative to the axial direction of the support ball ring (104).

6. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: one end of the base rod part (1014) far away from the base body (1001) is provided with a blocking part (106).

7. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: the bottom surface of the closed connecting seat (105) is provided with an inclined groove (1055), and the through direction of the inclined groove (1055) is inclined relative to the central axis direction of the axial mounting hole (1052) of the closed connecting seat; and a notch part (1047) is arranged on the lower bottom surface of the supporting ball ring (104).

8. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: two opposite bulges (1036) are arranged on the bearing ball ring (103); two seat body blocking platforms (1024) which are arranged oppositely are arranged on a connecting seat axial through hole (1022) of the connecting seat body (10200); when the protrusion (1036) of the receiving ball ring (103) moves below the seat block (1024) of the connecting seat body (10200), the seat block (1024) blocks the protrusion (1036).

9. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: the nail body accommodating part (1044) is of a spherical cavity structure with a downward opening, a plurality of accommodating part separating grooves (1045) are arranged along the circumferential direction of the inner wall of the nail body accommodating part (1044), and all the accommodating part separating grooves (1045) divide the nail body accommodating part (1044) into a plurality of elastic accommodating part sheet bodies.

10. A two-rod connection assembly for sacral iliac fixation as recited in claim 1, wherein: the nail body accommodating part (1038) is of a spherical cavity structure with a downward opening, a plurality of accommodating part separation grooves (1039) are formed in the circumferential direction of the inner wall of the nail body accommodating part (1038), and the nail body accommodating part (1038) is divided into a plurality of elastic accommodating part sheets by all the accommodating part separation grooves (1039).

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