CN209153861U - A kind of hollow screw target drill for surveying drilling depth - Google Patents

Abstract

The utility model relates to the hollow screw target drills that one kind can survey drilling depth, it includes shank and is coaxially fixed on the cutting portion of shank lower end, the central passage passed through for Kirschner wire is offered at the central axis of shank and cutting portion, the lateral wall of shank is equipped with the graduation mark extended in the axial direction, the side passageway axially extended is equipped in the side wall of shank and cutting portion, Sounding Rod is provided in side passageway, the lower end of Sounding Rod is connect with the upper end of arc elbow, the lower stomidium stretched out out of side passageway for the lower end of arc elbow is provided at the side wall lower ends of cutting portion, spring is folded between the upper end of Sounding Rod and the upper end wall of side passageway, the side wall upper part of shank offers the waist hole for being connected to side passageway top and stretching in the axial direction.It has the beneficial effect that, comes with Sounding Rod in the side wall of hollow boring bit, after drilling out through-hole on bone, do not need hollow boring bit taking out the through-hole being drilled with, can accurately measure drilling depth, structure is simple and convenient to operate.

Description

A kind of hollow screw target drill for surveying drilling depth

Technical field

The drill bit that the utility model relates to use when bone surgery, specially a kind of hollow screw that can survey drilling depth are special Use drill bit.

Background technique

The two-part specific size situation fragmented into when according to fracture site and fracture, bone surgery at knochenbruch to answering Usually there are two types of methods for position surgical procedure: one is being broken into two sections from middle part and being suitble to implant plate, usually directly It drills respectively on two-section knochenbruch, after taking out drill bit, the depth of corresponding drilling on test bone in drilling, root is protruded into bathometer Screw is selected to be fixed with two knochenbruch respectively by steel plate two is disconnected according to depth is measured；Another kind is that bone ends fracture one is irregular small The case where block or other unsuitable implant plates is usually first to be positioned two knochenbruch with Kirschner wire to fix, then with hollow at this time Drill bit drills under kirschner needle guide, after being then log out hollow boring bit, is fixedly connected with two knochenbruch with hollow screw.For latter Kind of situation, it is usually the scale that leans on drilling rod to prompt to pierce depth that hollow boring bit, which pierces depth, for needing that bone is complete When some situations drilled, since drill bit has drilled bone completely, chisel edge is not to hold agent level with both hands under through-hole on bone, Therefore the depth of through-hole on bone can not be accurately known by the scale on drilling rod, the length of hollow screw can not be just determined at this time, And select hollow screw it is too short or it is too long be to be adversely affected to the success of operation.Moreover, for latter situation, After the completion of drilling, the depth of drilling can not be known with the method that bathometer measures again by first taking out drill bit, because in hole After there are also Kirschner wires, influence protruding into for bathometer, and drill bit takes out, even if there is Kirschner wire to stay Yu Kongzhong, two knochenbruch are still had A degree of dislocation, even if bathometer size smaller can extend into can also influence measurement because of the above-mentioned dislocation of knochenbruch in hole Accuracy.

Utility model content

The utility model provides a kind of hollow screw target drill that can survey drilling depth, and the drill bit is hollow boring bit, purport It can not effectively know that via depth causes nothing when for being drilled with through-hole on bone solving hollow boring bit in the prior art Method determines the technical issues of hollow screw for selecting appropriate size.

The technical solution that the utility model solves above-mentioned technical problem is as follows: the hollow screw that one kind can survey drilling depth is special With drill bit comprising shank and the cutting portion for being coaxially fixed on the shank lower end, the central axis of the shank and cutting portion Place offers the central passage passed through for Kirschner wire, and the lateral wall of the shank is equipped with the graduation mark extended in the axial direction, institute The side passageway for being equipped with and axially extending in the side wall of shank and cutting portion is stated, is provided with Sounding Rod in the side passageway, institute The lower end for stating Sounding Rod is connect with the upper end of the arc elbow made of spring steel wire, and the side wall of the cutting portion closes at lower end It is provided with the lower stomidium stretched out out of described side passageway for the lower end of the arc elbow, the upper end of the Sounding Rod and institute It states and is folded with spring between the upper end wall of side passageway, the side wall upper part of the shank is offered to be connected with the side passageway top Waist hole that is logical and stretching in the axial direction, be fixed on the Sounding Rod side wall can be slided up and down in the waist hole it is convex Column is also provided with the bayonet being connected to the waist hole upper end and the side passageway, the bayonet on the side wall of the shank Positioned at the waist hole upper end side and be caught in for the pillar, when the pillar is caught in the bayonet, the spring is pressed It contracts and the arc elbow is incorporated into the side passageway, the pillar is turned into the waist hole from the bayonet and is displaced downwardly to When being clamped with the waist hole lower end, the spring is still compressed and the arc elbow stretches out from the lower stomidium.

Based on the above technical solution, the utility model can also do following improvement.

Further, the quantity of the side passageway has multiple and circumferential uniform intervals settings along the shank, Mei Gesuo It states side passageway and is corresponding with the corresponding Sounding Rod, arc elbow, waist hole and bayonet.

Beneficial effect using above-mentioned further scheme is, after being drilled bone using above-mentioned drill bit, by operating protruding shaft Arc elbow is stretched out from corresponding lower stomidium, the axis of arc elbow and shank and cutting portion after stretching has angle (about 60 to 90 degree), after multiple arcs elbow stretches out, the hollow boring bit is above mentioned, then multiple arcs elbow can be stuck on bone and bore At the interface of through-hole lower end surface and musculature after wearing, the lower end of cutting portion is flushed with the lower end of through-hole substantially at this time, then The depth of through-hole can be accurately known with through-hole upper end with the reading at the bone face place of flushing from the graduation mark on shank, namely has been determined The length for the hollow screw for needing to select.Multiple arcs elbow, it is opposite with the dynamics at muscle interface bigger to block bone, operation Person can be more easier and accurately judge to perceive whether lower end blocks.

Further, the cutting portion is equipped with the cutting edge formed by multiple helicla flutes, and the lower end hole is located at the spiral shell Bottom in spin slot and close to the cutting portion.

Beneficial effect using above-mentioned further scheme is, closer to lower end, then continues lower brill after needing to drill bone Depth is smaller (space for providing the stretching of arc elbow).

Further, the bayonet includes circumferential openings section and axially open section, one end of the circumferential openings section with it is described The connection of waist hole upper end, the other end are connected to axially open section upper end.

Beneficial effect using above-mentioned further scheme is, when drilling, protruding shaft is caught in axially open section, arc elbow income In side passageway (in lower stomidium), drilling operation is not influenced, when drilling rear depth measurement, is manually first mentioned protruding shaft then circumferentially upwards Open section is rotated to the waist hole, is then loosened, and under spring promotion, Sounding Rod moves down and stretches arc elbow from lower stomidium Out, it having angle, is caught in when convenient for above mentioning at bone face and muscle interface with cutting portion axis direction.

Further, the length of the waist hole is 0.5-1.2cm, the length phase of the arc length and the waist hole of the arc elbow Together.

Beneficial effect using above-mentioned further scheme is, easy to operate, do not have to worry arc elbow stretch out it is too long or on It mentions excessively, foolproof operation, as long as control protruding shaft is caught in bayonet when drilling, control protruding shaft abuts i.e. with waist hole lower end when depth measurement It can.

Further, the lower stomidium is a counterbore, and arc elbow lower end is fixed with and the matched plug of the counterbore.

Beneficial effect using above-mentioned further scheme is that plug is matched with counterbore, is considered to be worth doing when drilling by bone when oppressing, because blocking up Head presence, arc open elbow will not be jacked up upwards in side passageway bending or because bone bits enter under stomidium due to block under stomidium； Meanwhile plug is slightly thicker than arc elbow rest part and has corner easily with jam at bone and muscle interface, is conducive to depth measurement When positioning.

Further, the outer diameter of the shank is less than the outer diameter of the cutting portion.

Beneficial effect using above-mentioned further scheme is that shank is more smaller than cutting portion, setting and brill convenient for helicla flute The outlet that bone is considered to be worth doing when hole.

Further, the zero graduation of the graduation mark is corresponding with the central point present position of the lower stomidium.

Beneficial effect using above-mentioned further scheme is, the reading on graduation mark is up big and down small and zero graduation just and lower end Central point of hole present position is corresponding, i.e., when bone and muscle interface block at arc elbow and through-hole lower end, zero graduation is basic Be it is concordant with through-hole lower end, it is logical for only needing to read corresponding numerical value at this time from the corresponding scale of graduation mark from through-hole upper end The depth in hole, it is simple and convenient.

Compared with prior art, the utility model has the beneficial effects that

Sounding Rod is come in the side wall of hollow boring bit, after drilling out through-hole on bone, Sounding Rod lower end can be from cutting portion It closes on the side wall at bottom and stretches out an arc elbow, gently above mention the through-hole lower end that drill bit can perceive arc elbow Yu drill out The case where blocking at bone and muscle interface, i.e., the lower end of drill bit is substantially concordant with the lower end of the through-hole drilled out, at this time from shank The position being aligned on graduation mark with through-hole upper end can read the depth of through-hole, namely the length for needing hollow screw to be used has been determined Degree, when depth measurement, do not need to take out hollow boring bit into the through-hole being drilled with, and will not be misplaced when measurement at knochenbruch, and measurement is accurate, while its Structure is simple and convenient to operate.

Detailed description of the invention

Fig. 1 is the schematic diagram for the hollow screw target drill that one kind provided by the utility model can survey drilling depth；

Fig. 2 is the enlarged drawing in Fig. 1 at dashed circle A；

Fig. 3 is the enlarged drawing in Fig. 1 at dashed circle B；

Fig. 4 is the schematic diagram of waist hole and bayonet on the hollow boring bit shank side wall in Fig. 1；

Fig. 5 is sectional view of the hollow boring bit shank along C-C in Fig. 1.

In attached drawing, parts list represented by the reference numerals are as follows:

1. shank；2. cutting portion；3. central passage；4. side passageway；5. Sounding Rod；6. arc elbow；7. lower stomidium； 8. spring；9. waist hole；10. pillar；11. bayonet；12. plug.

Specific embodiment

The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical It is novel, it is not intended to limit the scope of the utility model.

As shown in Fig. 1 to 5, the utility model provides a kind of hollow screw target drill that can survey drilling depth comprising It is offered at the central axis of shank 1 and the cutting portion 2 for being coaxially fixed on 1 lower end of shank, the shank 1 and cutting portion 2 For the central passage 3 that Kirschner wire passes through, the lateral wall of the shank 1 is equipped with the graduation mark extended in the axial direction, the shank 1 And the side passageway 4 axially extended is equipped in the side wall of cutting portion 2, and it is provided with Sounding Rod 5 in the side passageway 4, it is described The lower end of Sounding Rod 5 is connect with the upper end of the arc elbow 6 made of 8 steel wire of spring, under the side wall of the cutting portion 2 closes on The lower stomidium 7 stretched out out of described side passageway 4 for the lower end of the arc elbow 6 is provided at end, the Sounding Rod 5 Spring 8 is folded between upper end and the upper end wall of the side passageway 4, the side wall upper part of the shank 1 offers and the side 4 top of square channel is connected to and the waist hole 9 that stretches in the axial direction, and being fixed on 5 side wall of Sounding Rod can be in the waist hole 9 The pillar 10 inside slided up and down is also provided on the side wall of the shank 1 equal with 9 upper end of waist hole and the side passageway 4 The bayonet 11 of connection, the bayonet 11 are located at the upper end side of the waist hole 9 and are caught in for the pillar 10, the pillar 10 when being caught in the bayonet 11, and the spring 8 is compressed and the arc elbow 6 is incorporated into the side passageway 4, described Pillar 10 from the bayonet 11 be turned into the waist hole 9 and be displaced downwardly to 9 lower end of waist hole be clamped when, the spring 8 still by Compression and the arc elbow 6 stretching from the lower stomidium 7.

It should be noted that it is preferable to use the stronger spring steel of shape retentivity for arc elbow, even if guaranteeing that it is long-term In the side passageway near lower stomidium and lower stomidium, shape is almost straightened or slightly bent, but when it is stretched out from lower stomidium When, it just can restore the crooked radian of its script automatically, form the state with cutting portion upper axial direction about 60-90 degree angle, Bone and meat boundary are blocked when drill bit above to mention.It should also be noted that, shank and cutting portion can be integrally formed, Sounding Rod and Arcuation elbow can be integrally formed.

Further, the quantity of the side passageway 4 has multiple and is arranged along the circumferential uniform intervals of the shank 1, each The side passageway 4 is corresponding with the corresponding Sounding Rod 5, arc elbow 6, waist hole 9 and bayonet 11.

It should be noted that only showing the situation an of side passageway and a corresponding Sounding Rod, art technology in Fig. 1 Personnel can according to need, and symmetrically 2,3 or 4 side passageway of setting and correspondence are rotated in the side wall of hollow boring bit The structure of Sounding Rod.

Further, the cutting portion 2 is equipped with the cutting edge formed by multiple helicla flutes, and the lower stomidium 7 is located at described Bottom in helicla flute and close to the cutting portion 2.

Further, the bayonet 11 includes circumferential openings section and axially open section, one end of the circumferential openings section and institute The connection of 9 upper end of waist hole is stated, the other end is connected to axially open section upper end.

Further, the length of the waist hole 9 is 0.5-1.2cm, the length of the arc length of the arc elbow 6 and the waist hole 9 It spends identical.

Further, the lower stomidium 7 is a counterbore, and 6 lower end of arc elbow is fixed with matched stifled with the counterbore First 12.

Further, the outer diameter of the shank 1 is less than the outer diameter of the cutting portion 2.

Further, the zero graduation of the graduation mark is corresponding with the central point present position of the lower stomidium.

It should be noted that cutting portion be arranged as far as possible in the conceived case it is shorter；In addition, those skilled in the art answer What is known is that the upper end of shank should be provided with the connector connecting with electric drill motor output end.

The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model Within the scope of shield.

Claims (8)

1. the hollow screw target drill that one kind can survey drilling depth, which is characterized in that including shank (1) and be coaxially fixed on institute It states the cutting portion (2) of shank (1) lower end, offers at the central axis of the shank (1) and cutting portion (2) and passed through for Kirschner wire Central passage (3), the lateral wall of the shank (1) is equipped with the graduation mark extended in the axial direction, the shank (1) and cutting It is equipped with the side passageway (4) axially extended in the side wall in portion (2), is provided with Sounding Rod (5), institute in the side passageway (4) The lower end for stating Sounding Rod (5) is connect with the upper end of the arc elbow (6) made of spring (8) steel wire, the side of the cutting portion (2) Wall closes at lower end the lower stomidium for being provided with and stretching out out of the side passageway (4) for the lower end of the arc elbow (6) (7), it is folded with spring (8) between the upper end of the Sounding Rod (5) and the upper end wall of the side passageway (4), the shank (1) Side wall upper part offer the waist hole (9) for being connected to the side passageway (4) top and stretching in the axial direction, the Sounding Rod (5) it is fixed with the pillar (10) that can be slided up and down in the waist hole (9) on side wall, is also opened on the side wall of the shank (1) Equipped with the bayonet (11) being connected to the waist hole (9) upper end and the side passageway (4), the bayonet (11) is located at the waist It the upper end side in hole (9) and is caught in for the pillar (10), when the pillar (10) is caught in the bayonet (11), the spring (8) it is compressed and the arc elbow (6) is incorporated into the side passageway (4), the pillar (10) is from the bayonet (11) When being turned into the waist hole (9) and being displaced downwardly to the clamping of the waist hole (9) lower end, the spring (8) is still compressed and the arc Shape elbow (6) stretches out at the lower stomidium (7).

2. the hollow screw target drill that one kind according to claim 1 can survey drilling depth, which is characterized in that the side The quantity of square channel (4) has multiple and is arranged along the circumferential uniform intervals of the shank (1), and each side passageway (4) is equal It is corresponding with the corresponding Sounding Rod (5), arc elbow (6), waist hole (9) and bayonet (11).

3. the hollow screw target drill that one kind according to claim 1 can survey drilling depth, which is characterized in that described to cut It cuts portion (2) and is equipped with the cutting edge formed by multiple helicla flutes, the lower stomidium (7) is located in the helicla flute and close to described The bottom of cutting portion (2).

4. the hollow screw target drill that one kind according to claim 1 can survey drilling depth, which is characterized in that the card Mouth (11) includes circumferential openings section and axially open section, and one end of the circumferential openings section is connected to the waist hole (9) upper end, separately One end is connected to axially open section upper end.

5. one kind according to any one of claims 1 to 4 can survey the hollow screw target drill of drilling depth, feature exists In the length of the waist hole (9) is 0.5-1.2cm, and the arc length of the arc elbow (6) is identical as the length of the waist hole (9).

6. one kind according to any one of claims 1 to 4 can survey the hollow screw target drill of drilling depth, feature exists In the lower stomidium (7) is a counterbore, and arc elbow (6) lower end is fixed with and the matched plug of the counterbore (12).

7. the hollow screw target drill that one kind according to claim 6 can survey drilling depth, which is characterized in that the handle The outer diameter in portion (1) is less than the outer diameter of the cutting portion (2).

8. the hollow screw target drill that one kind according to claim 6 can survey drilling depth, which is characterized in that the quarter The zero graduation for spending line is corresponding with the central point present position of the lower stomidium.