CN214549757U - Femoral stem extracting instrument - Google Patents

Abstract

The utility model belongs to the technical field of medical instrument, a femoral stem takes out apparatus is disclosed. This femoral stem takes out apparatus includes: a sleeve; one end of the clamping part is sleeved at the end part of the sleeve, and a through groove which is perpendicular to the axis of the sleeve and penetrates through the clamping part is formed in the clamping part; and link assembly, link assembly sliding connection is in the sleeve, and link assembly constructs to be: one end extends into the through groove and forms a clamping space with the through groove, and the other end is used for driving external force. The clamping space is used for being inserted into the femoral stem pyramid, and the connecting rod assembly can adjust the size of the clamping space through sliding relative to the sleeve under the action of external force. The utility model discloses a femoral stem takes out apparatus can be adapted to the femoral stem pyramis of different models or the femoral stem pyramis that melts to can take out the femoral stem more smoothly.

Description

Femoral stem extracting instrument

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to femoral stem takes out apparatus.

Background

The arthroplasty is a procedure in which a damaged prosthesis is peeled off from the surrounding bone tissue or cement, and a new prosthesis is implanted. In total hip arthroplasty, removal of the femoral stem is an important procedure.

Under the influence of factors such as early prosthesis design and installation, the phenomenon of prosthesis fracture and periprosthetic fracture easily appear in the femoral stem taking-out process, bring secondary injury to patients, therefore, the femoral stem is taken out to generally use femoral stem taking-out apparatus, but current femoral stem taking-out apparatus is generally of snap-in type, the position that is used for occluding the femoral stem pyramis of this femoral stem taking-out apparatus is adapted with the pyramis of the femoral stem of standard specification, when meeting the pyramis or pyramis of the femoral stem of less model and having the condition of melting, the problems that contact with the pyramis of poor, clamping force is insufficient can appear in the occlusion position, lead to the femoral stem can not take out smoothly.

SUMMERY OF THE UTILITY MODEL

In order to be adaptive and the femoral stem pyramis of different models or the femoral stem pyramis looks adaptation that melts to can take out the femoral stem more smoothly, the utility model provides a femoral stem takes out apparatus.

This femoral stem takes out apparatus includes: a sleeve; one end of the clamping part is sleeved at the end part of the sleeve, and a through groove which is perpendicular to the axis of the sleeve and penetrates through the clamping part is formed in the clamping part; and link assembly, link assembly sliding connection is in the sleeve, and link assembly constructs to be: one end extends into the through groove and forms a clamping space with the through groove, and the other end is used for driving external force. The clamping space is used for being inserted into the femoral stem pyramid, and the connecting rod assembly can adjust the size of the clamping space through sliding relative to the sleeve under the action of external force.

Further, the sleeve is configured as an internally threaded pipe portion having an inner peripheral wall formed with a threaded structure, the link assembly includes a screw rod threadedly connected to the internally threaded pipe portion and passing through the clamping portion into the through groove, and a movable slider detachably connected to an end of the screw rod located in the through groove, a clamping space is formed between opposite side faces of the clamping portion and the movable slider.

Further, one of the ends of the screw rod and the movable sliding block which are connected is provided with a connecting protrusion, and the other end of the screw rod and the movable sliding block is provided with a connecting groove matched with the connecting protrusion, wherein the screw rod can rotate along the circumferential direction of the screw rod relative to the movable sliding block under the matching of the connecting protrusion and the connecting groove.

Further, the clamping part includes the linkage segment that is connected with the internal thread pipe portion and the segmental arc that deviates from the linkage segment bending that links to each other with the linkage segment, leads to the groove and forms between linkage segment and segmental arc.

Furthermore, a clamping groove is formed in one end, opposite to the screw rod, of the movable sliding block, and the clamping groove and the arc-shaped section form an arc-shaped clamping space.

Further, the included angle between the plane of the arc-shaped section and the plane of the axis of the internal thread pipe part ranges from 5 degrees to 20 degrees.

Furthermore, the femoral stem extraction instrument further comprises a handle assembly, wherein the handle assembly is connected with one end, far away from the movable sliding block, of the screw rod so as to drive the screw rod to rotate under the action of external force.

Further, the handle assembly comprises a handle sleeve and a handle, one end of the handle sleeve is fixedly connected with the screw, a notch is formed in the other end of the handle sleeve, and the handle is arranged in the notch and hinged to the handle sleeve.

Further, the femoral stem removal instrument further comprises: the annular limiting bulge is sleeved on the outer peripheral wall of the sleeve; establish with the cover and establish the impact sliding hammer that telescopic periphery wall just is located between spacing arch and the clamping part, impact sliding hammer and sleeve formation sliding connection, impact sliding hammer sets to: can slide along the length direction of the sleeve under the driving of external force.

Further, the arc-shaped section and/or the clamping groove are/is provided with a buffer component on the surface for fitting the femoral stem cone, and the buffer component is configured to be capable of fitting with the outer peripheral wall of the femoral stem cone in an adaptive manner through self elastic deformation.

Compared with the prior art, the utility model discloses a femoral stem takes out apparatus has following advantage:

1) by applying external force to the connecting rod, the size of a clamping space formed by one end of the connecting rod extending into the through groove and the through groove can be adjusted, so that the femoral shaft clamping device can be suitable for the conical parts of femoral shafts of different models or the conical parts of the ablated femoral shafts to smoothly take out the femoral shaft;

2) the femoral stem extraction instrument adopts a threaded screw connection mode through setting the connecting rod as the screw, after a rotating acting force is applied to one end of the screw, the other end of the screw rotates and relatively moves axially and linearly, and the rotating motion is converted into a linear motion adjusting mode, so that the linear motion of the screw is more accurate, the clamping space is conveniently and accurately adjusted to a proper size, and meanwhile, the labor is saved;

3) the connecting bulge is formed on one of the end parts connected with the screw rod and the movable sliding block, the connecting groove matched with the connecting bulge is formed on the other end part, the screw rod can rotate relative to the movable sliding block along the circumferential direction of the screw rod under the matching of the connecting bulge and the connecting groove, so that the movable sliding block which forms a clamping space together with the clamping part only moves towards or away from the clamping part under the rotation action of the screw rod, and cannot rotate synchronously with the screw rod, so that the side circumferential wall of the clamping space formed by the clamping part and the movable sliding block together can be fully contacted with the femoral stem pyramid part, and a better clamping effect is achieved;

4) through setting up the femoral stem and taking out apparatus still includes handle components, handle components and the one end of keeping away from the removal slider of screw rod link to each other to drive the screw rod and rotate under the effect of external force, the operating personnel of being convenient for drives the screw rod and rotates, and is also more laborsaving simultaneously to the screw rod application of force.

Drawings

Fig. 1 is a schematic view of a femoral stem extraction instrument according to an embodiment of the present invention;

FIG. 2 is a top view of the femoral stem removal instrument shown in FIG. 1;

FIG. 3 is an enlarged view of the femoral stem removal instrument of FIG. 2 at A;

fig. 4 is a front view of the femoral stem removal instrument shown in fig. 1.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the femoral stem extraction device of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1-4 illustrate the structure of a femoral stem extraction instrument 100 according to an embodiment of the present invention, including: the method comprises the following steps: a sleeve 1; a clamping part 13, one end of the clamping part 13 is sleeved on the end part of the sleeve 1, and a through groove 11 (shown in fig. 2) which is perpendicular to the axis of the sleeve 1 and penetrates through the clamping part 13 is formed on the clamping part 13; and link assembly 2, link assembly 2 sliding connection is in sleeve 1, and link assembly 2 constructs to be: one end extends into the through groove 11 and forms a clamping space 15 with the through groove 11, and the other end is used for driving external force. The clamping space 15 is used for inserting the femoral stem taper portion 200, and the connecting rod assembly 2 can adjust the size of the clamping space 15 through sliding relative to the sleeve 1 under the action of external force.

The femoral stem removal instrument 100 according to the embodiment of the present invention applies an external force away from the through groove 11 to one end of the connecting rod assembly 2 driven by an external force, so that the size of the clamping space 15 formed by the other end of the connecting rod assembly 2 extending into the through groove 11 and the through groove 11 is larger than the femoral stem pyramid 200. Then, the femoral stem extraction instrument 100 is moved to the position of the femoral stem pyramid part 200, the femoral stem pyramid part 200 is inserted into the clamping space 15, finally, external force close to the through groove 11 is applied to one end of the connecting rod assembly 2, the clamping space 15 formed by the other end of the connecting rod assembly 2 extending into the through groove 11 and the through groove 11 is reduced, and after the clamping space 15 clamps the femoral stem pyramid part 200, external force far away from the human body is applied to the femoral stem instrument 100, so that the femoral stem pyramid part 200 is driven to be separated from the human body.

The femoral stem extraction instrument 100 of the present embodiment allows the size of the clamping space 15 formed by the end of the connecting rod assembly 2 extending into the through groove 11 and the through groove 11 to be adjustable by applying an external force to the connecting rod assembly 2, and thus can be adapted to the tapered portions 200 of femoral stems of different models or the tapered portions 200 of an ablated femoral stem to smoothly extract the femoral stem.

Referring to fig. 2 and 3, the sleeve 1 may be configured as an internally threaded tube portion 12 having a threaded structure formed on an inner peripheral wall thereof, and the connecting rod assembly 2 may include a screw 21 that is threadedly coupled to the internally threaded tube portion 12 and passes through the clamping portion 13 into the through groove 11, and a moving slider 22 that is detachably coupled to an end of the screw 21 located in the through groove 11, and a clamping space 15 may be formed between opposite side surfaces of the clamping portion 13 and the moving slider 22. Compare in direct application to link assembly 2 and make its rectilinear motion's effort, through threaded screw rod connection's mode, make after applying rotatory effort to the one end of screw rod 21, the other end of screw rod 21 is relative self axial rectilinear motion in the rotation, this embodiment adopts the mode of regulation that converts rotary motion into rectilinear motion promptly, adjusting screw rod 21's rectilinear motion is more accurate, and then is convenient for accurately adjust clamping space 15 to suitable size, and is also more laborsaving simultaneously.

As shown in fig. 3, one of the ends of the screw bar 21 connected to the moving slider 22 may be formed with a coupling protrusion 211, and the other may be formed with a coupling groove 221 coupled to the coupling protrusion 211, wherein the screw bar 21 is rotatable relative to the moving slider 22 in its circumferential direction by the coupling of the coupling protrusion 211 and the coupling groove 221. If the movable slider 22 rotates, the clamping space 15 formed by the movable slider 22 and the clamping part 13 is not matched with the shape of the femoral stem pyramid part 200, so that the clamping function cannot be realized, and by the arrangement, under the rotation action of the screw 21, the movable slider 22 forming the clamping space 15 together with the clamping part 13 only moves towards or away from the clamping part 13, and cannot rotate synchronously with the screw 21, so that the side peripheral wall of the clamping space 15 formed by the clamping part 13 and the movable slider 22 can be fully contacted with the femoral stem pyramid part 200, and a better clamping effect is achieved. In the embodiment as shown in fig. 3, the coupling protrusion 211 may be configured to include a head and a neck, the coupling groove 221 may include a first groove to receive the head and a second groove to receive the neck, wherein a radial dimension of the first groove is greater than a radial dimension of the second groove so that the coupling protrusion 211 is not separated from the coupling groove 221 when the coupling protrusion is mounted to the coupling groove, and the head may be provided in a three-dimensional shape having a circular shape in a radial direction, such as a cylinder, a truncated cone, a sphere, a hemisphere, or the like, so that the moving slider 22 coupled to the screw 21 is not rotated simultaneously when the screw 21 is rotated.

Referring to fig. 3 and 4, the clamping portion 13 may include a connection section 131 connected to the internally threaded pipe portion 12 and an arc-shaped section 132 connected to the connection section 131 and bent away from the connection section 131, and the through-groove 11 may be formed between the connection section 131 and the arc-shaped section 132. Because the femoral stem main body and the femoral stem pyramid part 200 form an included angle, the axial direction of the through groove 11 formed on the arc section 11 is parallel to the axial direction of the femoral stem pyramid part 200 by arranging the arc section 132 which is bent away from the connecting section 131, the force application direction of an operator is consistent with the axial direction of the femoral stem pyramid part 200, and the femoral stem pyramid part 200 is more convenient and labor-saving to take out.

As shown in fig. 3, the end of the movable slider 22 opposite to the screw 21 may further be formed with a clamping groove 222, and the clamping groove 222 and the arc-shaped segment 132 may form an arc-shaped clamping space 15. Through this setting for the centre gripping recess 222 forms closed circular arc's centre gripping space 15 with the arc section 132 jointly, and this centre gripping space 15 and the shape adaptation of femoral stem pyramis 200 can laminate femoral stem pyramis 200 better, have better centre gripping effect.

Preferably, as shown in FIG. 4, the plane in which the arcuate segment 132 lies may be at an angle α in the range of 5-20 to the plane in which the axis of the internally threaded pipe portion 12 lies. Because the included angle alpha formed between the femoral stem main body and the femoral stem conical part 200 is generally within the range of 5-20 degrees, the force application direction of an operator can be further consistent with the axial direction of the femoral stem conical part 200 through the arrangement, and the femoral stem conical part 200 can be taken out more conveniently and more laborsavingly.

According to the femoral stem removal device 100 of the present embodiment, as shown in fig. 1, the femoral stem removal device 100 may further include a handle assembly 3, and the handle assembly 3 may be connected to an end of the screw rod 21 away from the movable slider 22 to rotate the screw rod 21 under an external force. Through this setting, can be convenient for operating personnel to the screw rod 21 application of force, drive screw rod 21 and rotate, also laborsaving simultaneously.

As shown in fig. 2, the handle assembly 3 may include a handle sleeve 31 and a handle 32, one end of the handle sleeve 31 may be fixedly connected with the screw 21, and the other end may be formed with a notch, and the handle 32 is disposed in the notch and forms an articulated joint with the handle sleeve 31. Through the arrangement, the handle 32 and the screw 21 can be conveniently connected in a rotating manner, so that the screw 21 is driven to rotate and move linearly, the movable sliding block 22 can move linearly relative to the clamping part 13, and the size of the clamping space 15 is adjusted.

Preferably, the handle 32 may have a self-locking function capable of locking after rotation, and the handle 32 may be kept still when no external force is applied or the external force does not reach a specified value. The "self-locking function" can be realized by providing the handle 32 and the screw 21 to form an interference fit, that is, when the external force applied to the handle 32 by the operator is greater than the connection acting force of the handle 32 and the screw 21, the handle 32 rotates, and when the external force applied to the handle 32 by the operator is not applied or is less than the connection acting force of the handle 32 and the screw 21, the handle 32 keeps still. Of course, there are other ways to achieve the "self-locking function" and the method is not limited herein.

As shown in fig. 1, the femoral stem removal instrument 100 may further include: the annular limiting bulge 4 is sleeved on the outer peripheral wall of the sleeve 1; establish the periphery wall at sleeve 1 and be located the smooth hammer 5 of impact between spacing arch 4 and the clamping part 13 with the cover, strike smooth hammer 5 and sleeve 1 and can form sliding connection, strike smooth hammer 5 and can set to: can slide along the length direction of the sleeve 1 under the driving of external force. Because the femoral stem is fastened and fixed in the human body before being taken out, if the mode of direct force application is adopted, the femoral stem is particularly laborious when being taken out, and the impact sliding hammer 5 and the limiting protrusion 4 are arranged, so that the femoral stem can be taken out by driving the conical part of the femoral stem to be separated from the human body by the impact force generated when the femoral stem is impacted by the impact sliding hammer 5 and the limiting protrusion 4, and the labor is saved.

Preferably, the arc-shaped segment 132 and/or the clamping groove 222 may be provided with a buffer member (not shown) on a surface thereof for fitting the femoral stem taper 200, and the buffer member may be configured to be capable of being adaptively fitted to the outer peripheral wall of the femoral stem taper 200 by its elastic deformation. The clamping portion of the femoral stem extraction instrument in the prior art is generally made of a rigid material with a fixed shape, but the femoral stem cone portion 200 is ablated in actual use, and the ablated femoral stem cone portion 200 has an irregular shape, so that the femoral stem cone portion cannot be sufficiently attached to the clamping portion, and the clamping effect is not good. Through this setting, can make the centre gripping space 15 adaptable to the periphery wall of the femoral stem pyramis 200 that melts, be promptly with the periphery wall of femoral stem pyramis 200 fully laminate and the contact, improve the centre gripping effect of femoral stem extraction instrument 100. The "buffer member" referred to herein may be provided to be made of a rubber material.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A femoral stem extraction instrument, comprising:

a sleeve;

one end of the clamping part is sleeved at the end part of the sleeve, and a through groove which is perpendicular to the axis of the sleeve and penetrates through the clamping part is formed in the clamping part; and

a link assembly slidably connected within the sleeve, the link assembly configured to: one end of the clamping rod extends into the through groove and forms a clamping space with the through groove, and the other end of the clamping rod is used for driving external force;

the clamping space is used for being inserted into the femoral stem pyramid, and the connecting rod assembly can adjust the size of the clamping space through sliding relative to the sleeve under the action of external force.

2. The femoral stem extraction instrument of claim 1, wherein the sleeve is configured as an internally threaded tubular portion having a threaded configuration formed on an inner peripheral wall thereof, the link assembly including a threaded rod threadedly coupled to the internally threaded tubular portion and passing through the clamping portion to the through slot, and a movable block removably coupled to an end of the threaded rod located in the through slot, the clamping space being defined between opposing sides of the clamping portion and the movable block.

3. The femoral stem extraction instrument according to claim 2, wherein one of the ends of the screw rod and the movable block to which the screw rod is coupled is formed with a coupling protrusion, and the other end of the screw rod and the movable block is formed with a coupling groove to be fitted with the coupling protrusion, wherein the screw rod is rotatable relative to the movable block in a circumferential direction thereof in cooperation of the coupling protrusion and the coupling groove.

4. The femoral stem extraction instrument of claim 2, wherein the grip portion comprises a connecting section connected to the internally threaded tube portion and an arcuate section connected to the connecting section that curves away from the connecting section, the through slot being formed between the connecting section and the arcuate section.

5. The femoral stem extraction instrument of claim 4, wherein the end of the movable slider opposite to the screw is further formed with a clamping groove, and the clamping groove and the arc-shaped segment form an arc-shaped clamping space.

6. The femoral stem removal instrument of claim 5, wherein the angle between the plane of the arcuate segment and the plane of the axis of the internally threaded tubular portion is in the range of 5 ° to 20 °.

7. The femoral stem removal device of any one of claims 2 to 6, further comprising a handle assembly connected to an end of the screw distal from the moving block to rotate the screw under an external force.

8. The femoral stem removal device of claim 7, wherein the handle assembly comprises a handle sleeve and a handle, the handle sleeve is fixedly connected to the threaded rod at one end and is formed with a notch at the other end, and the handle is disposed in the notch and is hinged to the handle sleeve.

9. The femoral stem extraction instrument of any one of claims 2-6, further comprising: the annular limiting bulge is sleeved on the outer peripheral wall of the sleeve; and the cover is established telescopic periphery wall and be located spacing arch with strike smooth hammer between the clamping part, strike smooth hammer with the sleeve forms sliding connection, strike smooth hammer and set to: the sleeve can slide along the length direction of the sleeve under the driving of external force.

10. The femoral stem extraction instrument of claim 5, wherein the arcuate segment and/or the clamping groove are provided with a buffer member on a surface thereof for engaging with the femoral stem taper, the buffer member being configured to be able to adaptively engage with an outer peripheral wall of the femoral stem taper by elastic deformation thereof.

Images