CN209826936U - Operation structure of medical screw and medical screw device - Google Patents

Abstract

The utility model provides an operation structure and medical screw device of medical screw, the distal end of medical screw has the nail cover of U-shaped, the nail cover forms two guide arms, at least one along the opening direction of U-shaped have on the guide arm along the first shrinkage pool of the radial setting of medical screw, the operation structure of medical screw has an extension arm, the one end of extension arm is equipped with first boss, the outline of first boss with first shrinkage pool phase-match, just first boss be used for with first shrinkage pool looks block. Through the operation structure of the medical screw, the common medical screw can be used instead of a special screw, so that the use cost can be reduced. After the operation is finished, the extension arm and the medical screw can be conveniently detached and separated, so that the operation structure of the medical screw can be recovered for the next use. Therefore, the operation structure of the medical screw can be repeatedly used, and the cost is further reduced.

Description

Operation structure of medical screw and medical screw device

Technical Field

The utility model relates to the technical field of medical instrument manufacturing, in particular to operating structure and medical screw device of medical screw.

Background

In the treatment of thoracolumbar fractures, a reduction device is often used to fix the thoracolumbar fractures. The reduction device mainly comprises a fixing rod and medical screws, the screw bodies of the medical screws are implanted into the thoracolumbar vertebrae and fixed with bones, the screw sleeves of the medical screws are used for connecting the fixing rod, the distance and the angle between the medical screws are adjusted, and then the fixing rod and the corresponding medical screws are locked to achieve the purpose of treatment. Several types of medical screws which are commonly used at present mainly comprise a single-axis screw (as shown in figure 1) and a multi-axis screw (as shown in figure 2), and the operation usually adopts open operation, so that the wound of a patient is large.

And if the micro-wound operation is adopted, the advantages of small wound, light pain and quick recovery are achieved. However, in minimally invasive surgery, a medical screw for lengthening the nail sleeve part needs to be selected for operation in the minimally invasive surgery. The existing medical screw with the lengthened screw sleeve part comprises two forms of a screw sleeve lengthened integral screw and a screw sleeve lengthened combined screw, and the screw sleeve lengthened integral screw and the screw sleeve lengthened combined screw have respective advantages and disadvantages. Specifically, the nail cover extension arm of the integrative screw of nail cover extension designs with screw formula as an organic whole, and its shortcoming is, and the machining degree of difficulty of nail cover extension arm is big, and the processing cost is high, so is unfavorable for promoting. In addition, the nail sleeve extension arm is an unnecessary part after the minimally invasive surgery is completed, and the nail sleeve extension arm can be taken out in a breaking mode, so that the broken length is often inconsistent with the expected length, and the surgery effect is affected. In addition, because the nail cover extension arm designs as an organic whole, nail cover extension arm can not used repeatedly, has further improved use cost. The lengthened combined screw for the screw sleeve is a screw which is obtained by clamping a screw with a special connecting structure and a special extending arm for the screw sleeve through the connecting structure, and has the defects that the structure is complex, the screw and the extending arm for the screw sleeve are specially designed and manufactured, and the extending arm for the screw sleeve cannot be matched with a conventional screw (namely, a common medical screw shown in figures 1 and 2) for use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an operation structure and medical screw device of medical screw to solve the medical screw that current extension nail cover part needs special design and lead to the cost higher, the structure is complicated and can't with ordinary medical screw looks adaptation scheduling problem.

In order to solve the technical problem, the utility model provides an operation structure of medical screw, the distal end of medical screw has the nail cover of U-shaped, the nail cover forms two guide arms, at least one along the opening direction of U-shaped have the edge on the guide arm the first shrinkage pool of the radial setting of medical screw, operation structure of medical screw has an extension arm, the one end of extension arm is equipped with first boss, the outline of first boss with first shrinkage pool phase-match, just first boss be used for with first shrinkage pool looks block.

Optionally, the extension arm has a rotation limiting portion, and the rotation limiting portion is used for limiting rotation of the first boss relative to the first concave hole.

Optionally, the guide arm further has a side wall, and a normal direction of the side wall is arranged at an angle to an axis of the first concave hole; the rotation limiting part at least comprises a rotation limiting wing, and the rotation limiting wing is used for abutting against the side wall so as to limit the rotation of the first boss relative to the first concave hole.

Optionally, the guide arm has two side walls which are arranged oppositely, the rotation limiting portion includes two rotation limiting wings which are arranged oppositely, and the two rotation limiting wings are used for abutting against the two side walls respectively.

Optionally, a second concave hole is formed in one of the side walls, a third concave hole is formed in the other side wall, the second concave hole and the third concave hole are oppositely arranged in the radial direction of the medical screw, and the axis of the second concave hole and the axis of the third concave hole are both arranged at an angle to the axis of the first concave hole;

one of them be equipped with the second boss on the limit commentaries on classics wing, another be equipped with the third boss on the limit commentaries on classics wing, the outline of second boss with the second shrinkage pool phase-match, the outline of third boss with the third shrinkage pool phase-match, the second boss and the third boss be used for respectively with the second shrinkage pool with third shrinkage pool looks block.

Optionally, the first boss has a first inclined surface, the second boss has a second inclined surface, the third boss has a third inclined surface, and the slope directions of the first inclined surface, the second inclined surface and the third inclined surface all face the direction of the end of the extension arm used for being connected with the medical screw.

Optionally, one end of the extension arm, which is used for being connected with the medical screw, is axially provided with a plurality of tooth sockets, the plurality of tooth sockets divide the extension arm into a plurality of inter-slot portions, and the first boss, the second boss and the third boss are respectively arranged on different inter-slot portions.

Optionally, the first boss is circular, and the second boss and the third boss are both oblong or elliptical; the long axis of the oblong shape or ellipse extends in the axial direction of the extension arm.

Optionally, the extension arm has a limiting wall disposed toward an end for connecting with the medical screw, and the limiting wall is used for abutting against an end of the guide arm to limit axial displacement of the medical screw toward the extension arm.

In order to solve the technical problem, the utility model also provides a medical screw device, which comprises the medical screw operating structure and the medical screw; the operating structure of the medical screw is detachably connected with the medical screw.

To sum up, in the utility model provides an among the operation structure of medical screw and the medical screw device, the one end of the extension arm of the operation structure of medical screw is equipped with and is used for the first boss with the first shrinkage pool assorted of medical screw, through first boss and first shrinkage pool looks block, can realize extension arm and current ordinary medical screw looks coupling and detachably is connected, after extension arm and medical screw connection, realize the extension of screw distal end promptly, the operation in the minimally invasive operation of being convenient for. Since a general medical screw can be used instead of a special screw, the use cost can be reduced. After the operation is finished, the extension arm and the medical screw can be conveniently detached and separated, so that the operation structure of the medical screw can be recovered for the next use. Therefore, the operation structure of the medical screw can be repeatedly used, and the cost is further reduced.

Drawings

Those skilled in the art will appreciate that the drawings are provided for a better understanding of the invention and do not constitute any limitation on the scope of the invention. Wherein:

FIG. 1 is a schematic view of a prior art uni-axial medical screw;

FIG. 2 is a schematic view of a prior art multi-axial medical screw;

fig. 3 is a front view of an operation structure of the medical screw according to an embodiment of the present invention;

FIG. 4 is a side view of the operative structure of the medical screw provided in FIG. 3;

FIG. 5 is an axial cross-sectional view of the operative configuration of the medical screw provided in FIG. 3;

FIG. 6 is a cross-sectional view of the operative configuration of the medical screw provided in FIG. 3;

fig. 7 is a perspective view of a medical screw device according to an embodiment of the present invention;

FIG. 8 is a front view of the medical screw device provided in FIG. 7;

fig. 9 is an axial cross-sectional view of the medical screw device provided in fig. 7.

In the drawings:

10-a guide arm; 20-a side wall; 21-a first recess; 22-a second recess; 30-a proximal end; 40-a distal end;

100-an extension arm; 101-a first end; 102-a second end; 110-gullet; 111-land portion; 200-rotation limiting wings; 211-a first boss; 212-a first bevel; 221-a second boss; 222-a second bevel; 231-a third boss; 232-a third bevel; 300-limit wall.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to scale, but rather are provided for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, the term "proximal" generally being the end near the diseased portion of the patient and the term "distal" generally being the end near the operator.

The following description refers to the accompanying drawings.

Referring to fig. 1 to 9, fig. 1 is a schematic view of a conventional single-axis medical screw, fig. 2 is a schematic view of a conventional multi-axis medical screw, fig. 3 is a front view of an operation structure of a medical screw according to an embodiment of the present invention, fig. 4 is a side view of the operation structure of the medical screw provided in fig. 3, fig. 5 is an axial cross-sectional view of the operation structure of the medical screw provided in fig. 3, fig. 6 is a cross-sectional view of the operation structure of the medical screw provided in fig. 3, fig. 7 is a perspective view of a medical screw device according to an embodiment of the present invention, fig. 8 is a front view of the medical screw device provided in fig. 7, and fig. 9 is an axial cross-sectional view of the medical screw device provided in fig. 7.

The embodiment of the utility model provides an operation structure of medical screw for cooperate with current medical screw and detachably is connected, so that the guide arm extension of medical screw, the operation in the operation of being convenient for microtrauma. The conventional medical screw described herein mainly includes a single-axis screw as shown in fig. 1 and a multi-axis screw as shown in fig. 2. Wherein the proximal end 30 of the medical screw is adapted to be driven into a bone of a patient to be fixed thereto; one side of the distal end 40 of the medical screw is provided with a U-shaped tack cover into which a fixation rod is placed. The single-shaft screw and the multi-shaft screw are different in that a screw sleeve of the single-shaft screw is fixedly connected with a screw body, the angle of the screw sleeve is not adjustable, a ball head is generally formed at the far end of the screw body of the multi-shaft screw, the screw sleeve is movably sleeved outside the ball head, and the screw sleeve and the ball head can be relatively fixed by a mechanism such as a jackscrew. Referring to fig. 1 and 2, in which fig. 1(a) is a front view of a conventional single-axis screw, fig. 1(B) is a side view of the single-axis screw of fig. 1(a), and fig. 1(C) is a top view of the single-axis screw of fig. 1 (a); fig. 2(a) is a front view of a conventional polyaxial screw, fig. 2(B) is a side view of the polyaxial screw of fig. 2(a), and fig. 2(C) is a top view of the polyaxial screw of fig. 2 (a). The nail sleeve of the medical screw forms two guide arms 10 along the opening direction (left side in the figure) of the U shape, at least one guide arm 10 is provided with a first concave hole 21 arranged along the radial direction of the medical screw, and the surface provided with the first concave hole 21 is called as the front surface of the guide arm 10. The first concave hole 21 may be a through hole or a blind hole.

As shown in fig. 3 to 6, the operating structure of the medical screw has an extension arm 100, preferably, the extension arm 100 is mainly used for extending along an axial direction of the medical screw, the extension arm 100 has a first end 101 and a second end 102 opposite to each other, the first end 101 of the extension arm 100 is provided with a first boss 211 (the first boss 211 is disposed near the first end 101 of the extension arm 100, but not limited to the end surface of the first end 101 of the extension arm 100), an outer contour of the first boss 211 matches with the first recess 21, the first boss 211 is used for engaging with the first recess 21 so as to connect the extension arm 100 with the guide arm 10 of the medical screw, and the engaging engagement of the first boss 211 with the first recess 21 at least limits an axial displacement of the extension arm 100 relative to the guide arm 10. Thus, the screw distal end is prolonged, and the operation in a micro-trauma operation is convenient. It should be understood that in some embodiments, the snap fit of the first protrusion 211 with the first recess 21 further defines radial displacement, circumferential displacement, rotation around the first recess 21, etc. of the extension arm 100 relative to the guide arm 10, for example, the first protrusion 211 may be snap-fitted with the first recess 21 by interference fit, etc. so that the medical screw can be operated through the extension arm 100. After the medical screw is screwed into the predetermined position, a force can be applied to the extension arm 100 to make the first boss 211 disengage from the first concave hole 21, so that the extension arm 100 can be separated from the medical screw. Through the utility model provides an operation structure of medical screw owing to can use ordinary medical screw not the screw of special-made, can reduce use cost. After the operation is finished, the extension arm and the medical screw can be conveniently detached and separated, so that the operation structure of the medical screw can be recovered for the next use. Therefore, the operation structure of the medical screw can be repeatedly used, and the cost is further reduced.

Further, the extension arm 100 has a rotation limiting portion for limiting the rotation of the first boss 211 relative to the first concave hole 21, so as to limit the rotation of the extension arm 100 relative to the screw sleeve of the medical screw. Referring to fig. 4 and 7 in conjunction with fig. 1 and 2, the guide arm 10 has a side wall 20 disposed along a radial direction of the medical screw, and a normal direction of the side wall 20 is disposed at an angle to an axis of the first concave hole 21, that is, the side wall 20 forms an included angle with a front surface of the guide arm 10; the rotation limiting part at least comprises a rotation limiting wing 200 arranged at an included angle with the main body part of the extension arm 100, the main body part of the extension arm 100 is a surface provided with the first boss 211, and the rotation limiting wing 200 is used for abutting against the side wall 20. Accordingly, the angle between the rotation-limiting wing 200 and the main portion of the extension arm 100 is preferably substantially equal to the angle between the side wall 20 and the front surface of the guide arm 10. Preferably, the normal direction of the side wall 20 is perpendicular to the axis of said first recess 21. The rotation of the extension arm 100 relative to the first recess 21 is limited by the abutment of the rotation limiting wing 200 and the side wall 20. The connection and operation of the operation structure of the medical screw to the medical screw are more reliable and more convenient. More preferably, each of the guide arms 10 has two side walls 20 (preferably arranged opposite to each other in a radial direction of the medical screw); the rotation limiting part comprises two rotation limiting wings 200 (preferably arranged oppositely along the radial direction of the medical screw); the two rotation limiting wings 200 are respectively used for abutting against the two side walls 20. In general, the guide arms 10 each have two opposite side walls 20, and the provision of two rotation limiting wings 200 allows one guide arm 10 to be sandwiched between the two rotation limiting wings 200, on the one hand, to better limit the non-rotation of the extension arm 100 relative to the first recess 21, and on the other hand, in some embodiments, to allow the two rotation limiting wings 200 to sandwich the guide arm 10 by means of a dimensional fit, and to limit the radial and axial displacements of the extension arm 100 relative to the guide arm 10 by means of friction.

Further, referring to fig. 3 to 7 in combination with fig. 1 and 2, in two side walls 20 of any one of the guide arms 10, a second concave hole 22 is disposed on one side wall 20, and a third concave hole (not shown) is disposed on the other side wall 20, the second concave hole 22 and the third concave hole are disposed opposite to each other along a radial direction of the medical screw, that is, the second concave hole 22 and the third concave hole are respectively disposed on two sides of an axis of the first concave hole 21, preferably, the second concave hole 22 and the third concave hole are symmetrically disposed with respect to the axis of the first concave hole 21, and the axis of the second concave hole 22 and the axis of the third concave hole are both disposed at an angle (preferably, perpendicularly disposed) with respect to the axis of the first concave hole 21; two be equipped with second boss 221 and third boss 231 on the rotation limiting wing 200 respectively, the outline of second boss 221 with second shrinkage pool 22 phase-match, the outline of third boss 231 with third shrinkage pool phase-match, second boss 221 with third boss 231 be used for respectively with second shrinkage pool 22 with third shrinkage pool looks block. As shown in fig. 1 and 2, in a typical sleeve portion of a conventional medical screw, recesses (i.e., a second recess 22 and a third recess, respectively) are formed in two side walls 20 of two guide arms 10, and the recesses are generally blind holes (but not limited to blind holes, and may also be through holes). Thus, the two rotation limiting wings 200 are respectively provided with the second boss 221 and the third boss 231, so that the second boss 221 and the third boss 231 can be clamped into the second concave hole 22 and the third concave hole respectively and then are matched with the first boss 211 in a clamping manner, the axial, radial and circumferential displacements of the extension arm 100 relative to the guide arm 10 and the rotation of the extension arm 100 relative to any concave hole are limited, the connection between the operation structure of the medical screw and the medical screw can be reliably ensured, and the extension arm 100 is used for operating the medical screw in a micro-trauma operation. It should be understood that, in some other embodiments, the two guide arms 10 are of the same structure, and the two side walls 20 thereof are respectively provided with the second concave hole 22 and the third concave hole, that is, the four side walls 20 of the two guide arms 10 are respectively provided with four concave holes, in this case, the two rotation limiting wings 200 are not limited to abut against the two side walls 20 of the same guide arm 10, but may abut against the two side walls 20 opposite to the upper direction of two different guide arms 10, respectively, and the two bosses provided on the two rotation limiting wings 200 may also be respectively engaged into the two concave holes opposite to the upper direction of different guide arms 10.

Preferably, as shown in fig. 3 and 5, the first boss 211 has a first inclined surface 212, the second boss 221 has a second inclined surface 222, and the third boss 231 has a third inclined surface 232, and the first inclined surface 212, the second inclined surface 222, and the third inclined surface 232 are all inclined toward the end of the extension arm 100 for connecting with the medical screw (i.e., the direction of the first end 101). The slope direction refers to a direction of a projection of a normal direction of any one of the inclined planes on the extension arm 100, that is, any one of the inclined planes gradually approaches the extension arm 100 from one end of the corresponding boss far away from the extension arm 100 to the first end 101. The three inclined planes slope towards the direction of the first end 101, so that the extension arm 100 can be conveniently connected with the guide arm 10 of the medical screw, and particularly, the first boss 211, the second boss 221 and the third boss 231 can be conveniently inserted into the corresponding concave holes, and the resistance when the bosses slide into the concave holes is reduced.

Preferably, as shown in fig. 3 and 7, a plurality of tooth grooves 110 are axially opened at one end (i.e., the first end 101) of the extension arm 100 for connection with the medical screw, the plurality of tooth grooves 110 divide the extension arm 100 into a plurality of intermediate portions 111, and the first boss 211, the second boss 221, and the third boss 231 are respectively provided at different intermediate portions 111. More preferably, the extension arm 100 has two slots 110, the two slots 110 divide the extension arm 100 into three slot parts 111, and the second boss 221, the first boss 211, and the third boss 231 are sequentially disposed on the three slot parts 111. The tooth grooves 110 are arranged, so that the extension arm 100 close to the first end 101 has certain elasticity, and when the boss slides into the concave hole, the groove part 111 can slightly open, so that the resistance of the boss when sliding into the concave hole is reduced.

Preferably, the first boss 211 is circular, and the second boss 221 and the third boss 231 are both oblong or elliptical; the long axis of the oblong shape or ellipse extends in the axial direction of the extension arm 100.

Further, referring to fig. 8 and 9, the extension arm 100 has a limiting wall 300 disposed toward one end (i.e., the first end 101) for connecting with the medical screw, and the limiting wall 300 is configured to abut against the end (the distal end 40) of the guide arm 10 to limit the axial displacement of the medical screw toward the extension arm 100. The limiting wall 300 abuts against the end face of the distal end 40 of the medical screw, so that the extension arm 100 is prevented from slipping towards the proximal end 30, and the stability of the connection between the extension arm 100 and the medical screw is increased. Specifically, when the limiting wall 300 abuts against the distal end 40 of the medical screw, the first boss 211 corresponds to the first concave hole 21, the second boss 221 corresponds to the second concave hole 22, and the third boss 231 corresponds to the third concave hole one by one, and the opened inter-groove portion 111 rebounds to enable the three bosses to slide into the corresponding concave holes, so that the extension arm 100 is fixedly connected with the medical screw, and the extension of the distal end 40 of the medical screw is realized.

Referring to fig. 7 to 9, an embodiment of the present invention further provides a medical screw device, which includes an operating structure of a medical screw and the medical screw, wherein the operating structure of the medical screw is detachably connected to the medical screw. After the extension arm is connected with the medical screw, the extension of the far end of the screw is realized, and the operation in a micro-trauma operation is facilitated. Since a general medical screw can be used instead of a special screw, the use cost can be reduced. After the operation is finished, the extension arm and the medical screw can be conveniently detached and separated, so that the operation structure of the medical screw can be recovered for the next use. Therefore, the operation structure of the medical screw can be repeatedly used, and the cost is further reduced.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (10)

1. The utility model provides an operation structure of medical screw, the distal end of medical screw has the nail cover of U-shaped, the nail cover forms two guide arms, at least one along the opening direction of U-shaped have on the guide arm along the first shrinkage pool of medical screw's radial setting, a serial communication port, operation structure of medical screw has an extension arm, the one end of extension arm is equipped with first boss, the outline of first boss with first shrinkage pool phase-match, just first boss be used for with first shrinkage pool looks block.

2. The operating structure of a medical screw according to claim 1, wherein the extension arm has a rotation restricting portion for restricting rotation of the first boss with respect to the first recessed hole.

3. The operating structure of a medical screw according to claim 2, wherein the guide arm further has a side wall, and a normal direction of the side wall is arranged at an angle to an axis of the first recessed hole; the rotation limiting part at least comprises a rotation limiting wing, and the rotation limiting wing is used for abutting against the side wall so as to limit the rotation of the first boss relative to the first concave hole.

4. The operating structure of a medical screw according to claim 3, wherein the guide arm has two opposite side walls, and the rotation-limiting portion includes two opposite rotation-limiting wings, and the two rotation-limiting wings are respectively configured to abut against the two side walls.

5. The operating structure of a medical screw according to claim 4, wherein a second concave hole is formed in one of the side walls, a third concave hole is formed in the other side wall, the second concave hole and the third concave hole are arranged opposite to each other in the radial direction of the medical screw, and the axis of the second concave hole and the axis of the third concave hole are both arranged at an angle to the axis of the first concave hole;

one of them be equipped with the second boss on the limit commentaries on classics wing, another be equipped with the third boss on the limit commentaries on classics wing, the outline of second boss with the second shrinkage pool phase-match, the outline of third boss with the third shrinkage pool phase-match, the second boss and the third boss be used for respectively with the second shrinkage pool with third shrinkage pool looks block.

6. The operating structure of a medical screw according to claim 5, wherein the first boss has a first slope, the second boss has a second slope, and the third boss has a third slope, and the slope directions of the first slope, the second slope and the third slope are all towards the end of the extension arm for connecting with the medical screw.

7. The medical screw operation structure according to claim 5, wherein a plurality of tooth grooves are formed in an end of the extension arm for connection with the medical screw in an axial direction, the tooth grooves divide the extension arm into a plurality of intermediate portions, and the first boss, the second boss, and the third boss are respectively provided in different intermediate portions.

8. The operating structure of a medical screw according to claim 5, wherein the first boss is circular, and the second boss and the third boss are both oblong or elliptical; the long axis of the oblong shape or ellipse extends in the axial direction of the extension arm.

9. The operating structure of a medical screw according to claim 1, wherein the extension arm has a limiting wall disposed toward an end for connection with the medical screw, the limiting wall being adapted to abut against an end of the guide arm to limit axial displacement of the medical screw toward the extension arm.

10. A medical screw device, comprising a medical screw and an operating structure of the medical screw according to any one of claims 1 to 9; the operating structure of the medical screw is detachably connected with the medical screw.