CN203369957U

CN203369957U - Femoral head center navigator

Info

Publication number: CN203369957U
Application number: CN201320431634.3U
Authority: CN
Inventors: 马台
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2014-01-01
Anticipated expiration: 2023-07-19

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a femoral head center navigator used for thighbone near-end intramedullary nail internal fixation. The navigator is composed of a guide rod, a reference needle guide pipe and an engager. A sliding chute is formed in the guide rod, the reference needle guide pipe can move along the sliding chute through matching of a nut and a screw, the engager is a U-shaped bayonet, one side end of the engager is fixedly connected with one end of the guide rod, and the other side of the engager is matched with the screw through a threaded hole. The navigator and an insertion handle of a thighbone near-end intramedullary nail are connected and fixed. The screw can be adjusted to enable the reference needle guide pipe to be located in the horizontal plane where the center of the thighbone is located. When the navigator is used in an operation, the top rake of a power nail is accurately grasped to enable the power nail knocked in through the insertion handle to guide the needle to pass through the center of the femoral head.

Description

Femoral head central navigation device

Technical field

This utility model belongs to technical field of medical instruments, is specifically related to a kind of PFN guiding tool of operation.

Background technology

PFN is the internal fixation apparatus that is used for the treatment of fractured near end of thighbone, main nail and two major parts of power nail, consists of.During application, main nail is placed in the pulp cavity of near end of thighbone, and the power nail is placed in the inside of femoral head and neck, and the two is " Y " shape and intersects fixing in the near end of thighbone osseous tissue.In the time of fixedly, want demanded driving force nail consistent with the top rake direction of neck of femur, otherwise not only fixedly strength is limited, and is prone to complication and causes operative failure.When plane that main nail and power nail forms during by capital central point, the power nail consistent with the top rake direction of neck of femur, so can grasp exactly the place at femoral head center in operation, aim at the femoral head center and squeeze into the guid needle of power nail, can make direction and the anteversion of femoral neck direction of the power nail of inserting be consistent.But, how in operation, to grasp the institute at femoral head center, at present not yet perfect solution clinically.

Summary of the invention

The purpose of this utility model is to provide a kind of central navigation of the femoral head for PFN internal fixation operation device of simple in structure, easy to use, function admirable, in order to can in the PFN internal fixation operation, accurately grasp the top rake of power nail.

The femoral head central navigation device that this utility model provides, its structure as shown in Figure 1, Figure 2, Figure 3 shows.It consists of guide bar 1, reference pin guide wire 4, adapter 7.Have the chute 2 that runs through guide bar 1 cross section on described guide bar 1, the medial surface of guide bar 1 indicates scale, as scale 3; Has nut 5 on described reference pin guide wire 4, there is screw 6 to coordinate with nut 5 through the chute 2 on guide bar 1, relatively fixing with reference to needle guide pipe 4, reference pin guide wire 4 can be moved along chute 2, described reference pin guide wire 4 is for passing and fixed reference pin 9; Described adapter 7 is a U-shaped bayonet socket, one side end of its U-shaped bayonet socket fixedly is connected with an end of guide bar 1, the opposite side of U-shaped bayonet socket has a screw, and this screw coordinates with screw 8, this omniselector can be connected mutually and fix with the insertion handle of PFN.By set screw 8, can make reference pin guide wire 4 on the horizontal plane at place, femur center.

In this omniselector, the chute 2 on described guide bar 1 is the track that moves of reference pin guide wire 4 and fixing support, and 3, the scale on guide bar 1 is the survey tool of reference pin guide wire 4 displacements.

In this omniselector, regulate the main nail afterbody that can make the reference pin squeezed into through reference pin guide wire 4 and PFN by screw tangent and intersect with its power nail.

Under normal circumstances, after PFN is inserted, if its power nail is consistent with the anteversion of femoral neck direction as requested, and when the afterbody of main nail is positioned at the greater trochanter of femur summit, the plane that main nail and power nail form is by capital central point, and the afterbody of main nail and capital being centered close on same level.According to these characteristics, when femoral head central navigation device, on main nail 13 tail plane, the insertion handle 11 by the U-shaped bayonet socket on adapter 7 and PFN is vertical be connected mutually after, regulate reference pin guide wire 4, make the reference pin 9 of squeezing into by reference to needle guide pipe 4 be close to (tangent) with main nail 13 afterbodys and intersect with the guid needle 10 of power nail, this intersection point is position, femoral head center.

During operation, at first squeeze into a reference pin by reference to the needle guide pipe in femoral head, offset distance at hip joint lateral projection witness mark needle point and femoral head center, calculate when take main nail and rotate the distance that insertion handle reference pin and scale when correcting this offset distance relatively move as axle with this distance.Finally remove the fixed relationship of reference pin guide wire and guide bar, take main nail as the axle rotary insertion enters handle, make reference pin mobile above-mentioned distance calculated on scale.The power nail guid needle of now squeezing into by the insertion handle must pass through capital center.

The accompanying drawing explanation

Fig. 1 is isometry structure chart of the present utility model.

Fig. 2 be this utility model with main nail and insert handle and be connected after etc. axonometric drawing.

Fig. 3 is this utility model with main nail and inserts the top view after handle is connected.

Fig. 4 inserts the reference pin schematic diagram under this utility model guiding.

Fig. 5 corrects under this utility model guiding to insert reference pin deviation schematic diagram.

Fig. 6 corrects under this utility model guiding to insert reference pin deviation principle schematic diagram.

Fig. 7 inserts power nail guid needle schematic diagram.

Number in the figure, 1 is guide bar, 2 is chute, 3 is scale, and 4 is the reference pin guide wire, and 5 is nut, 6 is the supporting screw of same nut 5,7 is adapter, and 8 is the fixing screw of

adapter

7, and 9 is reference pin, 10 guid needles for the power nail, 11 for inserting handle, 12 guide wires for power nail guid needle, and 13 is main nail.

The specific embodiment

This utility model is used operation as follows:

Before operation, as shown in Figure 2 and Figure 3, in vitro by the insertion handle 11 of the adapter 7 of femoral head central navigation device and PFN in main nail 13 tail plane vertical linking, and adjusting reference pin guide wire 4, make the reference pin 9 of squeezing into by reference to needle guide pipe 4 be close to (tangent) with main nail 13 afterbodys and intersect with the guid needle 10 of power nail, measure the distance of this intersection point apart from femoral head central navigation device scale 3, the degree of depth that when this distance is operation, reference pin 9 need to be squeezed into.

During operation, at first in femoral head, squeeze into reference pin 9, as shown in Figure 4.Secondly confirm that by the side position of perspective femoral head neck the needle point of reference pin 9 is whether on the center line of femoral head lateral projection, if not on the center line of femoral head lateral projection, on the femoral head lateral projection witness mark pin 9 needle point X depart from the femoral head center line the distance (deviation value) XX ', as shown in Figure 5, Figure 6.If now squeeze into the guid needle 10 of power nail and intersect with reference pin 9, the needle point of power nail guid needle 10 is also at the X point, and the distance (deviation value) that the needle point X of guid needle 10 departs from the femoral head center line is also XX '.The main nail 12 of take after the fixed relationship that unclamps screw 8 releasing reference pin guide wires 4 and guide bar 1 inserts handle 11 as axle rotates, when the needle point that makes power follow closely guid needle 10 goes to X ' point from the X point, the Y that inserts handle 11 names a person for a particular job and goes to Y ' point, scale 3 goes to the M point with the intersection point Q of reference pin 9, that is reference pin 9 mobile distance on scale 3 is MN.MN≈YY’＝XX’·YR/XR。According to this principle, last, unclamp screw 8 and make reference pin 9 and guide bar 1 without fixed relationship, take main nail 13 as the axle rotary insertion enters handle 11, making reference pin 9 mobile distance on scale 3 is MN, as shown in Figure 7.Now by the power nail guid needle guide pipe 12 that inserts handle 11, squeeze into power nail guid needle 10, guid needle 10 must pass through capital center.

Claims

1. a femoral head central navigation device, is characterized in that consisting of guide bar (1), reference pin guide wire (4), adapter (7); Have the chute (2) that runs through guide bar (1) cross section on described guide bar (1), the medial surface of guide bar (1) indicates scale, as scale (3); Described reference pin guide wire (4) is upper with nut (5), has screw (6) to coordinate with nut (5) through the chute (2) on guide bar (1), relatively fixing with reference to needle guide pipe (4), makes reference pin guide wire (4) mobile along chute (2); Described adapter (7) is a U-shaped bayonet socket, one side end of its U-shaped bayonet socket fixedly is connected with an end of guide bar (1), the opposite side of U-shaped bayonet socket has a screw, and this screw coordinates with screw (8), and this omniselector is connected mutually and fixes with the insertion handle of PFN; By set screw (8), make reference pin guide wire (4) on the horizontal plane at place, femur center.