CN211049727U

CN211049727U - Double-moving-head lining driver

Info

Publication number: CN211049727U
Application number: CN201921492151.8U
Authority: CN
Inventors: 李晖; 刘国春
Original assignee: Beijing Mai Di Zayin Technology Co ltd
Current assignee: Beijing Mai Di Zayin Technology Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-07-21
Anticipated expiration: 2029-09-09

Abstract

The utility model discloses a double acting head lining impactor, including the impactor pole, squeeze into the head of the head, the spring of rectifying and controlling the spring leaf, squeeze into the biography power end of head of the head fixed connection at the impactor pole, a tip of squeezing into the head of the head sets to cylindric stair structure, another tip sets to the concave spherical surface with the contact of acetabular liner spherical outside surface, the spring of rectifying installs in the cylindric stair structure department of squeezing into the head of the head, it is the trapezium structure to control the spring leaf, set up the perforation that supplies the impactor pole to pass on its minor face, it is equipped with on long limit and cracks, it can realize controlling the acetabular liner on the concave spherical surface of squeezing into the head to control the spring. The utility model discloses a strike the assembly that the mode realized femoral head and acetabular bone inside lining, assembly efficiency is high, still through setting up the deviation spring and controlling the spring leaf, can realize the control to the acetabular bone inside lining, plays the effect of centre gripping femoral head simultaneously, and fine realization is squeezed into not skew, and the effect that the inside lining did not collapse out has improved the assembly security of femoral head greatly.

Description

Double-moving-head lining driver

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a double-moving-head lining driver for loading a femoral head into an acetabular lining.

Background

Artificial hip replacement is the most effective surgical procedure for treating pain in the late stage of hip disease, and is widely used in both human and animal fields. In the design of artificial hip joint prosthesis, the dislocation rate is reduced in order to increase the range of motion to the maximum extent. Many joint manufacturers adopt the design concept of a double-acting cup, namely, the femoral head can rotate freely in an acetabular liner, and the acetabular liner can also rotate freely in the acetabular cup. This prosthesis design, while capable of achieving excellent clinical results, is difficult during the surgical procedure. Because the acetabular liner is generally over-hemispherical in design, the femoral head must be forcibly pressed into the acetabular liner. To this end, a great deal of design work has been done by large joint manufacturers, designing various installation instruments, such as SERF in france and Stryker in the united states. However, these instruments are relatively clumsy and inconvenient to use, and have certain safety hazards, such as sudden collapse of the acetabular liner 1 and femoral head 2 if the acetabular liner 1 and femoral head 2 are not aligned during the process of pressing the femoral head 2 into the acetabular liner 1, as shown in fig. 1, and the lack of a protective mechanism may injure surrounding nurses and doctors, even patients.

In order to solve the problem fundamentally, the utility model discloses an it is used for the femoral head to pack into the double acting head lining impactor of acetabular liner, makes it can realize the femoral head fast and pack into, can prevent again ingeniously that the acetabular liner from collapsing out the phenomenon emergence, furthest's reduction operation risk.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a double acting head lining impactor, make it can realize the femoral head fast and pack into, can prevent again ingeniously that the acetabular bone inside lining from collapsing out the phenomenon emergence, furthest's reduction operation risk to overcome the not enough of current femoral head installation apparatus existence.

In order to solve the technical problem, the utility model provides a double acting head liner driver, including driver pole, driver head, the spring of rectifying and controlling the spring leaf.

The device comprises a driver head, a driving device rod, a correcting spring, a driving device rod and a driving device, wherein one end of the driver rod is a driving end, the other end of the driver head is a force transmission end, the driving device head is fixedly connected to the force transmission end of the driver rod, the end part of the driving device head connected with the force transmission end is arranged to be a cylindrical step structure, the other end of the driving device head is arranged to be a concave spherical surface used for being in contact with an outer spherical surface of an acetabular liner, the correcting spring is installed at the cylindrical step structure of the driving device head, the correcting spring is in a trapezoid structure, a through hole for the driving device rod to penetrate through is formed in the short edge of the trapezoid structure, the long edge of the trapezoid structure is located on the concave spherical surface side of the driving device head, a seam is formed in.

The correction device is further improved, the gap between the inner side of the correction spring and the outer side wall of the cylinder of the cylindrical stepped structure is smaller than or equal to 1mm, and the diameter of a through hole on the short side of the trapezoidal structure is the same as that of the cylinder section of the cylindrical stepped structure.

The further improvement is that the end surfaces of the two sides of the deviation rectifying spring are both of a plane structure.

The force transmission end of the driver rod is provided with a force transmission flange, and the force transmission flange is tightly attached to the upper end face of a cylinder of the cylindrical stepped structure of the driver head.

The improved structure is characterized in that a protruding end with external threads is arranged at the center of a force transmission flange of the driver rod, a through hole with internal threads is formed in the cylindrical step structure of the driver head, and the external threads of the protruding end are matched with the internal threads of the through hole.

The improvement is further that the through hole in the cylindrical step structure of the driver head is a counter bore.

The improvement is that the through hole inside the cylindrical step structure of the driver head is communicated with the concave spherical surface at the other end of the driver head.

In a further improvement, the slot on the long edge of the holding spring piece is a circular opening consisting of two arc edges.

Further improvement, the edges of the two arc edges of the holding spring piece are sleeved with silica gel sleeves or silica gel layers.

In a further improvement, the concave spherical surface of the driver head is matched with the outer spherical surface of the acetabulum lining, and the striking end of the driver rod is provided with a hand holding part and a striking end surface.

After adopting such design, the utility model discloses following advantage has at least:

1. the double-moving-head liner driver adopts a striking loading mode to realize the assembly of the femoral head and the acetabular liner, abandons the slow loading mode of hand pinching and thread spinning, and greatly improves the assembly efficiency; still through setting up the spring of rectifying and controlling the spring leaf, can realize beating the in-process at whole and always controlling the acetabular bone inside lining, play the effect of centre gripping femoral head simultaneously, can be fine realize beating into not squinting, the technical effect that the inside lining does not burst out has improved the security of femoral head assembly greatly.

2. Still through establishing the cylinder section of driving into the head with the spring cover of rectifying, and set for the clearance between the inside of the spring of rectifying and the cylinder lateral wall and be no longer than 1mm to make the perforation diameter on this spring leaf minor face the same with cylinder section diameter, and will rectify the spring and set up smoothly at both sides terminal surface, all can make this rectifying spring play good rectifying effect, make the assembly of femoral head and acetabular bone inside lining become easier and quick.

3. The force transmission flange is arranged at the force transmission end of the driver rod, and the force transmission flange is tightly attached to the upper end face of the cylinder, so that the effective transmission of impact force is achieved, the phenomenon that threads are rapidly damaged due to the fact that the threads are directly transmitted through threads is avoided, and the service life of the double-acting-head liner driver is seriously influenced. And the effective transmission of impact force can be further enhanced by the arrangement of the counter bores.

4. The slots on the long edges of the holding spring pieces are set to be round openings, so that the femoral head can be conveniently clamped. The edge of the round opening is coated with rubber, so that the scratch of the edge of the opening to the outer side of the femoral head during driving can be well avoided.

Drawings

The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

FIG. 1 is a schematic view of a prior art installation instrument for installing a femoral head into an acetabular liner;

FIG. 2 is a schematic structural view of the dual action head liner driver of the present invention (showing the femoral head not inserted);

FIG. 3 is a schematic structural view of the dual action head liner driver of the present invention (showing the femoral head in the loaded state);

FIG. 4 is a schematic view of the force-transmitting end of the driver rod of the dual-action head liner driver of the present invention;

FIG. 5 is a schematic diagram showing the longitudinal cross-sectional structure of a driver head in the double acting head liner driver of the present invention;

fig. 6 is a schematic structural view of a holding spring piece in the double acting head lining driver of the present invention.

Detailed Description

Referring to fig. 2 and 3, the double acting head liner driver of the present embodiment is used for assembling the femoral head 2 and the acetabular liner 1, and comprises a driver rod 3, a driver head 4, a deviation rectifying spring 5 and a holding spring piece 6.

Wherein, one end of the driver rod 3 is a striking end, and the other end is a force transmission end. The striking end is provided with a grip part 8 and a striking end surface 7, and the striking end surface 7 is used for receiving the impact of external instruments and transmitting the impact force to the power transmission end through the rod part of the driver rod 3.

The driver head 4 is fixedly connected to the power transmission end of the driver rod 3 in a threaded or other manner, or may be integrally provided. In this embodiment, the driver head 4 is screwed to the driver rod 3. The force transmission end of the driver rod 3 is provided with an extension end 32 with external threads 33, the connection end part of the driver head 4 is provided with a through hole 42 with internal threads 43, and the external threads 33 of the extension end 32 are matched with the internal threads 43 of the through hole 42 to realize the connection of the driver head 4 and the driver rod 3. Of course, it is also possible to provide the power transmission end of the driver rod 3 with a through hole with internal thread and the connecting end of the driver head 4 with an extension end with external thread, which also enables the connection of the driver head to the driver rod.

However, the transmission of the impact force between the driver head 4 and the driver rod 3 is not a direct transmission through the screw thread, because during long-term use, if transmitted through the screw thread, damage to the screw thread occurs, thereby causing the entire driver to fail. The impact force received by the driver rod 3 in the embodiment is transmitted through the force transmission flange, and the specific structure is as follows:

referring to fig. 4 and 5, the force transmission end of the driver rod 3 is provided with a force transmission flange 31, the end of the driver head 4 connected with the force transmission end of the driver rod 3 is provided with a cylindrical step structure 41, the protruding end 32 of the driver rod 3 with the external threads 33 protrudes from the center of the force transmission flange 31, the through hole 42 of the driver head 4 with the internal threads 43 is positioned inside the cylindrical step structure 41, when the protruding end 32 enters the through hole 42 through threads, the force transmission flange 31 is tightly attached to the cylindrical upper end surface of the cylindrical step structure 41, and the transmission of the impact force of the driver rod 3 to the driver head 4 can be realized. Preferably, the diameter of the force transmission flange 31 is the same as the diameter of the upper end face of the cylindrical section, so that the maximum transmission of impact force is realized.

In addition, the through hole 42 inside the cylindrical stepped structure of the driver head 4 is formed as a counter bore, so that the end of the protruding end 32 is in contact with the counter bore plane, thereby further preventing the screw from being stressed and better realizing the transmission of the impact force.

In this embodiment, the other end of the driver head 4 is provided with a concave spherical surface 44 for contacting with the outer spherical surface of the acetabular liner 1. In a preferred embodiment, the concave spherical surface 44 of the driver head 4 matches with the outer spherical surface of the acetabular liner 1, so that impact force can be better transmitted to the acetabular liner 1 through the spherical surface, and the femoral head 2 can be conveniently installed.

The through hole 42 in the cylindrical step structure of the driver head 4 is communicated with the concave spherical surface 44 at the other end of the driver head 4, so that the gas in the through hole can be discharged when the driver rod 3 is in threaded connection with the driver head 4, and the gas in the concave spherical surface can be discharged when the femoral head 2 is installed.

In order to prevent the acetabular liner from easily collapsing when the femoral head is inserted, the present embodiment is provided with a correction spring 5 and a holding spring piece 6 at the driver head 4. The deviation rectifying spring 5 is sleeved outside the cylindrical section of the cylindrical step structure 41 of the driver head 4, and the gap between the inner side of the deviation rectifying spring 5 and the outer side wall of the cylinder cannot exceed 1 mm. Because the clearance is too large, the compression spring can generate deflection during use, and the deflection correcting and aligning effects cannot be achieved.

The holding spring piece 6 is formed by bending a stainless steel plate, has good elasticity and certain bearing capacity, and is not easy to generate plastic deformation. In this embodiment, the holding spring piece 6 is bent in a trapezoidal configuration as shown in fig. 6. The short side of the trapezoid structure is provided with a through hole 61 for the driver rod 3 to pass through, the long side of the trapezoid structure is positioned on the concave spherical surface side of the driver head 4, and the long side of the trapezoid structure is provided with a slit 62, namely the trapezoid structure is disconnected. And the size of the through hole 61 is similar to the diameter of the cylindrical section of the driver head 4, so that the spring holding piece 6 can conveniently move up and down on the cylindrical section of the driver head 4 under the elastic force action of the deviation-correcting spring 5. In addition, the two side end faces of the deviation rectifying spring 5 are both of a plane structure, so that the deviation rectifying spring can be better attached to the holding spring piece 6, and the deviation rectifying effect is good.

Also for better gripping of the femoral head 2 by the slot in the bottom edge of the retaining spring plate 6, the slot 62 is provided as a circular opening consisting of two arcuate edges 63. And the edges of the two arc-shaped edges 63 are all encapsulated, such as directly sleeving a silica gel sheath or coating a silica gel layer. The purpose of this encapsulation is to prevent the slotted edge of the retaining spring plate 6 from scratching the femoral head 2.

In use, when the acetabular liner 1 is not fitted, the holding spring pieces 6 are in a relaxed state, and after the acetabular liner 1 is fitted, the acetabular liner 1 is held by the concave spherical surface 44 of the driver head 4 and the two separated flat surfaces at the bottom of the holding spring pieces 6, so that the entire double action head liner driver can stably hold the acetabular liner 1, as shown in fig. 2. Then the femoral head 2 is placed into the slit 62 at the bottom of the holding spring piece 6, the center line of the femoral head 2 is aligned with the center line of the acetabular liner 1, an impact force is applied to the striking end face 7, the striking rod 3 transmits the impact force to the striking head 4, the striking head 4 transmits the impact force to the acetabular liner 1 through a spherical surface, and the acetabular liner 1 loads the femoral head 2 into the acetabular liner 1 under the action of the impact force, as shown in fig. 3. Because the acetabulum lining 1 is always held by the double-acting-head lining driver in the striking process and cannot easily fall off, and because the slits 62 at the bottom of the holding spring pieces 6 are contacted with the femoral head 2, the slight expansion towards two sides can be generated, and the femoral head 2 is slightly clamped, the holding spring pieces 6 always hold the acetabulum lining 1 and simultaneously clamp the femoral head 2 under the action of the deviation rectifying springs 5 in the whole driving process, thereby realizing the effects of driving without deviation and not collapsing the lining.

The utility model discloses double acting head lining impactor is safe, swift, the reduction of very big limit the risk of operation, abundant protection doctor, nurse and patient's safety.

The above description is only for the preferred embodiment of the present invention, and not intended to limit the present invention in any way, and those skilled in the art can make various modifications, equivalent changes and modifications using the above-described technical content, all of which fall within the scope of the present invention.

Claims

1. A double-acting-head liner driver is characterized by comprising a driver rod, a driver head, a deviation rectifying spring and a holding spring piece,

2. The double acting head liner driver according to claim 1, wherein the gap between the inside of the deflection spring and the outer cylindrical wall of the cylindrical step structure is less than or equal to 1mm, and the diameter of the through hole on the short side of the trapezoid structure is the same as the diameter of the cylindrical section of the cylindrical step structure.

3. The double acting head liner driver according to claim 2, wherein both side end faces of the deflection correcting spring are of a planar structure.

4. The double acting head liner driver according to any one of claims 1 to 3, wherein the force transfer end of the driver rod is provided with a force transfer flange that fits tightly against the cylindrical upper end face of the driver head cylindrical step structure.

5. The double action head liner driver according to claim 4, wherein the driver rod has a protruding end with external thread at the center of the force-transmitting flange, and the driver head has a through hole with internal thread inside the cylindrical step structure, and the external thread of the protruding end is matched with the internal thread of the through hole.

6. The double action head liner driver according to claim 5, wherein the through hole inside the driver head cylindrical step structure is a counter bore.

7. The double action head liner driver according to claim 5, wherein the through hole inside the cylindrical step structure of the driver head communicates with the concave spherical surface at the other end of the driver head.

8. The dual action head liner driver of claim 1 wherein the slit on the long side of the gripping spring plate is a circular opening consisting of two curved sides.

9. The dual-action-head-liner driver according to claim 8, wherein the two arc-shaped edges of the holding spring plate are sleeved with a silica gel sheath or coated with a silica gel layer.

10. The double action head liner driver according to claim 1, wherein the concave spherical surface of the driver head matches the outer spherical surface of the acetabular liner, and the striking end of the driver rod is provided with a hand grip and a striking face.