CN201664339U - Intramedullary fixed guider - Google Patents

Abstract

The utility model discloses an intramedullary fixed guider, which relates to the medical field. In the utility model, a needle inlet point A and a needle outlet point B can obtain data according to the measuring result of the preoperative three-dimensional reconstruction CT, wherein the needle inlet point A can be directly positioned according to body surface marks because the position is superficial and is easy to reveal. Then, combining the CT measuring date, the guider locates the needle outlet B, and then connects the needle inlet point A and the needle outlet point B. Because three-dimensional CT scanning data is utilized and a nailing point is determined through a positioning device to determine the nail outlet direction of the guider, the nail inlet/outlet paths can be accurately controlled. The nail inlet/outlet paths are ensured through a precise instrument without relying on the experience of the operator; therefore, the screw can be avoided from mistakenly entering the hip joint or mistakenly passing through the bone cortex to damage nerves, blood vessels and other important anatomic structures.

Description

Marrow internal fixation guider

Technical field

This utility model relates to medical domain, particularly the marrow internal fixation technology in the medical domain.

Background technology

Nowadays, pelvis and fracture of acetabulum sickness rate increase year by year, have accounted for 1%～3% of the total routine number of fracture, disability rate about 50%～60%.The internal fixation method of ring is the fixing of steel plate or marrow inner bolt at present.The treatment of steel plate operation has and resets goodly, and advantage such as internal fixation is reliable, but this method otch is big exposes extensively, and amount of bleeding is more.Use the biomechanical stability of the marrow inner bolt that drives in the wrong direction to be better than steel plate for simple fracture of pubic rami.But because pubic branch-acetabular anterior column anatomical structure uniqueness, the neural process of important blood vessels is arranged, and it is narrow to enter to follow closely the path, penetrates in the process at screw on every side, might be strayed into hip joint or mistake penetrates cortical bone, important anatomy structure such as injured nerve, blood vessel also causes serious postoperative complication.Therefore select correct entry point, inserting needle direction, screw diameter and length to become the key of safe pedicle screw.

Designer of the present utility model finds, in existing superior ramus of pubis-acetabular anterior column zone operation, can be by the medical worker who undergos surgery by the straightforward manipulation under fully exposing and in conjunction with x-ray fluoroscopy, carry out the implantation of screw, yet, the acetabular anterior column region of anatomy of living in is darker, shallow table has iliopsoas, femoral artery, vital tissues such as vein and femoral nerve and Coronamortis blood vessel, make the reduction of the fracture and internal fixation that direct-view is carried out down place very difficult, the safety of screw is implanted needs the serious experience that relies on operator, can't guarantee that the path that passes in and out nail can be accurately controlled, operation risk is bigger.

The utility model content

The purpose of this utility model is to provide a kind of marrow internal fixation guider, makes the path of turnover nail to be accurately controlled, thereby the screw mistake is worn the hip joint face or penetrated the bone wall, causes the operation risk of nervus vasculairs damage to reduce greatly.

For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of marrow internal fixation guider, comprises localizer and guide post;

Described localizer is used for the measurement data according to three-dimensional reconstruction CT before the art, positions going out pin mark B at patient's body surface place, obtains out pin mark B;

Guide post is used to connect entry point A and goes out pin mark B.

This utility model embodiment compared with prior art, the main distinction and effect thereof are:

Position going out pin mark B by localizer, wherein, go out pin mark B according to art before the measurement result of three-dimensional reconstruction CT obtain, utilize guide post to connect entry point A again and go out pin mark B.Owing to used the data of three-D CT scanning, and determined the nail point by positioner, that determines guider goes out to follow closely direction, thereby can control accurately turnover nail path.Because turnover nail path guarantees by precision instrument, but not the experience of dependence operator, therefore, can avoid screw to penetrate as much as possible and be strayed into hip joint in the process or penetrate cortical bone by mistake, the situation of important anatomy structure such as injured nerve, blood vessel, thereby the screw mistake is worn the hip joint face or penetrated the bone wall, cause the operation risk of nervus vasculairs damage to reduce greatly.

Further, localizer comprises bone mark point location pen 1 and U-shaped positioner 2, and the width of the length of bone mark point location pen 1 and U type positioner 2 all can be adjusted.The one side point of U type positioner 2 is provided with the annulus 3 that is used for ring set bone mark point location pen 1, and described annulus 3 is rotatable, and the opposite side end points of U type positioner 2 is hook-shaped.Because the length of bone mark point location pen 1 and the width of U type positioner 2 all can be adjusted, therefore, only need the width adjustment of U type positioner 2 distance for the BG that calculates by the CT measurement, the length adjustment of bone mark point location pen 1 is the length EF between the patient's that measures by CT the bone mark point, then with the bone mark point location pen 1 of ring set on U type positioner 2, be stuck in patient's bone mark point EF place, U type positioner 2 be a hook-shaped side point indication place, be out pin mark B.Not only easy and simple to handle, and the accurate positioning that has guaranteed pin mark B.In addition, because the length of bone mark point location pen 1 and the width of U type positioner 2 all can adjust, therefore applicable to the pelvises of various different sizes.

Further, the scale that is equipped with on the bottom bar 4 of bone mark point location pen 1 and U type positioner 2, the width of the length of bone mark point location pen 1 and U type positioner 2 is all adjusted according to scale set on it.Because the scale that the length of bone mark point location pen 1 and the width of U type positioner 2 all can be carved with according to itself is adjusted, thereby need not to be equipped with again other scales, make the adjustment of width of the length of bone mark point location pen 1 and U type positioner 2, more simple and convenient.

Description of drawings

Fig. 1 is according to the localizer sketch map in this utility model one better embodiment;

Fig. 2 is according to the guider sketch map in this utility model one better embodiment;

Fig. 3 is the measurement result sketch map according to three-dimensional reconstruction CT before the art in this utility model one better embodiment;

Fig. 4 is according to utilizing localizer to going out the sketch map that pin mark B positions in this utility model one better embodiment;

Fig. 5 connects the sketch map of turnover pin mark according to the guide post that utilizes in this utility model one better embodiment.

The specific embodiment

In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.

For making the purpose of this utility model, technical scheme and advantage clearer, embodiment of the present utility model is described in further detail below in conjunction with accompanying drawing.

This utility model one better embodiment relates to a kind of marrow internal fixation guider, is applied to the marrow internal fixation of superior ramus of pubis to acetabular anterior column.This marrow internal fixation guider comprises localizer and guide post.

Localizer is used for positioning going out pin mark B, go out pin mark B according to art before the measurement result of three-dimensional reconstruction CT obtain.

Guide post is used to connect entry point A (entry point A can directly obtain in the body surface location according to the CT measurement data) and goes out pin mark B.

Specifically, the localizer in the present embodiment comprises bone mark point location pen 1 and U-shaped positioner 2 as shown in Figure 1, and the width of the length of bone mark point location pen 1 and U type positioner 2 all can be adjusted.The one side point of U type positioner 2 is provided with the annulus 3 that is used for ring set bone mark point location pen 1, and annulus 3 is rotatable, and the opposite side end points of U type positioner 2 is hook-shaped.The scale that is equipped with on the bottom bar 4 of bone mark point location pen 1 and U type positioner 2, the length of bone mark point location pen 1 is adjusted according to the scale that bone mark point location pen 1 is provided with.The width of U type positioner 2 is adjusted according to the scale that the bottom bar 4 of U type positioner 2 is provided with.

Guide post in the present embodiment as shown in Figure 2, rectangular U-shaped.The one side point of guide post is connected with drill bit, and drill bit is against entry point A, is used for holing from entry point A, and the side point connection of guide post is against out pin mark B.

To the using method of the marrow internal fixation guider of present embodiment, be specifically described below.

At first,, entry point, needle angle, front pillar smallest cross-sectional diameter and nail progress row are accurately measured, calculated BG, GF according to the axis of simulating Safety inserting needle on the 3D-CT cross section.Wherein, BG-BF * sin ∠ GFB, GF=BF * cos ∠ GFB, as shown in Figure 3.A among Fig. 3 is entry point, and B is for going out pin mark, and E, F are the bone mark point.

Then, utilize localizer to position to going out pin mark B.As shown in Figure 4, according to the scale on the bottom bar 4, be to utilize the distance of the BG that CT calculates with the width adjustment of U type positioner 2.Bone mark point location pen 1 is enclosed within the annulus 3, scale according to bone mark point location pen 1, the length adjustment of bone mark point location pen 1 is the length EF between the patient's that measures by CT the bone mark point, and the junction point (being annulus 3 places) that guarantees bone mark point location pen 1 and U type positioner 2 is the G point among Fig. 3.By rotation to annulus, bone mark point location pen 1 is stuck on patient's the bone mark point (E, F), because the width of U type positioner 2 has been set to the distance of BG, thus U type positioner 2 be a hook-shaped side point indication place, be out pin mark B.

After navigating to out pin mark B, can utilize guide post to connect the turnover pin mark, as shown in Figure 5.

Be not difficult to find, in the present embodiment, position going out pin mark B by localizer, wherein, go out pin mark B according to art before the measurement result of three-dimensional reconstruction CT obtain, utilize guide post to connect entry point A again and go out pin mark B.Owing to used the data of three-D CT scanning, and determined the nail point by positioner, that determines guider goes out to follow closely direction, thereby can control accurately turnover nail path.Because turnover nail path guarantees by precision instrument, but not the experience of dependence operator, therefore, can avoid screw to penetrate as much as possible and be strayed into hip joint in the process or penetrate cortical bone by mistake, the situation of important anatomy structure such as injured nerve, blood vessel, thereby the screw mistake is worn the hip joint face or penetrated the bone wall, cause the operation risk of nervus vasculairs damage to reduce greatly.

And, because the length of bone mark point location pen 1 and the width of U type positioner 2 all can be adjusted, therefore, only need the width adjustment of U type positioner 2 distance for the BG that calculates by the CT measurement, the length adjustment of bone mark point location pen 1 is the length EF between the patient's that measures by CT the bone mark point, then with the bone mark point location pen 1 of ring set on U type positioner 2, be stuck in patient's bone mark point EF place, U type positioner 2 be a hook-shaped side point indication place, be out pin mark B.Not only easy and simple to handle, and the accurate positioning that has guaranteed pin mark B.In addition, because the length of bone mark point location pen 1 and the width of U type positioner 2 all can adjust, therefore applicable to the pelvises of various different sizes.

What deserves to be mentioned is, in the present embodiment, the scale that is equipped with on the bottom bar 4 of bone mark point location pen 1 and U type positioner 2, the width of the length of bone mark point location pen 1 and U type positioner 2 is all adjusted according to scale set on it.Because the scale that the length of bone mark point location pen 1 and the width of U type positioner 2 all can be carved with according to itself is adjusted, thereby need not to be equipped with again other scales, make the adjustment of width of the length of bone mark point location pen 1 and U type positioner 2, more simple and convenient.

In addition, be appreciated that the scale that also can not be provided with on the bottom bar 4 of bone mark point location pen 1 and U type positioner 2, when needs carry out the adjustment of length or width, can be provided with graduated scale, realize the adjustment of length or width by other.

The confirmatory experiment of the guider in the present embodiment is as follows:

Get the dry pelvis specimen of 6 tools, simulate when reset effect is not good clinically the safety of application-oriented device.Earlier carry out the accurate quantification analysis according to above-mentioned three-dimensional reconstruction CT measuring sequence, the entry point that records, inserting needle direction and screw length, and the needed data of guider.Again respectively with thin saw by acetabular anterior column to obturator groove, the junction surface of sawed-off superior ramus of pubis and acetabular bone, analog bone broken line.

All specimen left sides are respectively between the Kirschner wire impaction fracture line of 1mm, 2mm, three kinds of diameters of 3mm with thickness, three kinds of distance state of fracture gap when simulating clinical resetting.Place guider and squeeze into diameter 6.5mm hollow screw respectively.The result works as fracture gap under three kinds of distance state, and all screws all can omnidistance pass through in marrow.All not having screw passes acetabular anterior column and enters articular cavity or pelvic cavity.

All specimen right sides will fracture near-end be shifted respectively to the inside 1mm, 2mm, 3mm simulate three kinds of distance state of the common displacement of clinical fracture, place guider and squeeze into diameter 6.5mm hollow screw respectively.The result is when displacement fracture 1mm and 2mm, and screw whole process is passed through in marrow; When fracture lateral displacement during at 3mm, screw body is still passed through in marrow, but the about 1-2mm of inboard cortex surface range of one piece of screw thread cutting fracture far-end wherein.All not having screw passes acetabular anterior column and enters articular cavity or pelvic cavity.Be not difficult to find, utilize the part specimen verified normal condition respectively and the different displaced condition of fracturing under the guider accuracy and the safety of using.Tentative confirmation its reliability of applying and practicality.

The evaluation criteria that resets to the fracture that relates to acetabular bone is clinically: (1) anatomical reduction: maximum shift 0～1mm; (2) satisfied resetting: maximum shift 1～3mm; (3) dissatisfied resetting: maximum shift＞3mm.Therefore, as standard, application-oriented device on the pelvis specimen, respectively with normal condition, fracture gap 1～3mm, three kinds of state drivescrews of fracture lateral displacement 1～3mm.The result shows no matter fracture gap is apart from the lateral displacement of still fracturing, and in 1～3mm scope, screw all can pass through acetabular anterior column safely.Illustrate through guider guiding, the marrow inner bolt can be passed through by the direction near the axle center,,, still have certain interval can guarantee that screw safety passes through even the displacement of 1～3mm is arranged because the smallest cross-sectional diameter is bigger than screw diameter.If screw disalignment when the smallest cross-sectional is far away, even can pass through safely when anatomical reduction, and when fracture can't gap, the anatomical reduction remaining 3mm left and right sides, screw penetrated the then significantly increase of chance of hip joint or pelvic cavity.

In experiment, find, after the marrow inner bolt passes through front pillar with different angles safety, safety range after upper limb passes behind the acetabular bone can form the approximate circle of an about 20mm of diameter, the safe axis of marrow inner bolt is described and definitely exists an adjustable safety range between the axis.If the error of 2mm appears in the measured value of guider, go out the nail point and also can be offset 2mm thereupon, so with respect to absolute axle center, guider generally can obtain the error on the safe side scope that about 8mm is a radius.

For the fracture of superior ramus of pubis-acetabular anterior column,, expose on a large scale when having avoided the open reduction internal fixation with steel plate on the preceding road of acetabular bone and peel off in the auxiliary method that can take Wicresoft to combine down of guider with open surgery.Simple front pillar fracture is fixing merely with lag screw after can resetting with limited incision, if simultaneously with serious rear pillar fracture, then can be fixing simultaneously at the rear pillar steel plate, under the guider guiding, utilize same otch in conjunction with the fixing front pillar of the limited auxiliary incision in the place ahead.Can in a kerf, finish the fixing of twin columns like this, thereby reduce operation wound, reduction amount of bleeding, shortening operating time, and can obviously reduce the perspective in the doctor and patient operation.Under the prerequisite that does not influence stability maintenance, the screw mistake is worn the hip joint face or penetrated the bone wall, cause the operation risk of nervus vasculairs damage to reduce greatly.

Though by reference some preferred implementation of the present utility model, this utility model is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and do not depart from spirit and scope of the present utility model.

Claims (4)

1. a marrow internal fixation guider is characterized in that, comprises localizer and guide post;

Described localizer is used for the measurement data according to three-dimensional reconstruction CT before the art, positions going out pin mark B at patient's body surface place, obtains out pin mark B;

Described guide post is used to connect entry point A and goes out pin mark B.

2. marrow internal fixation guider according to claim 1, it is characterized in that, described localizer comprises bone mark point location pen (1) and U-shaped positioner (2), and the width of the length of described bone mark point location pen (1) and U type positioner (2) all can be adjusted;

The one side point of described U type positioner (2) is provided with the annulus (3) that is used for the described bone mark point location of ring set pen (1), and described annulus (3) is rotatable, and the opposite side end points of described U type positioner (2) is hook-shaped.

3. marrow internal fixation guider according to claim 2 is characterized in that the length of described bone mark point location pen (1) is adjusted according to the scale that described bone mark point location pen (1) is provided with;

The width of described U type positioner (2) is adjusted according to the scale that the bottom bar (4) of described U type positioner (2) is provided with.

4. marrow internal fixation guider according to claim 1 is characterized in that, the rectangular U-shaped of described guide post;

The one side point of described guide post is connected with drill bit, and described drill bit is against described entry point A, is used for holing from described entry point A, and the side point connection of described guide post is against the described pin mark B of going out.

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