CN111839842B

CN111839842B - Surgical instrument for installing acetabular cup

Info

Publication number: CN111839842B
Application number: CN202010724975.4A
Authority: CN
Inventors: 史春宝; 解凤宝; 候惠欣; 郝孟娟
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2022-10-04
Anticipated expiration: 2040-07-24
Also published as: CN111839842A

Abstract

The utility model belongs to the technical field of acetabular cup installation and specifically relates to a surgical instruments is used in acetabular cup installation, and surgical instruments includes handle and rigid coupling at the erector connecting rod of handle one end, still includes the screwed joint of demountable installation keeping away from handle one end in the erector connecting rod, is equipped with on the screwed joint to be used for the blotter that offsets tightly with the acetabular cup inner wall of installation. The present application has the effect of reducing the possibility of deformation of the thread on the screw joint.

Description

Surgical instrument for installing acetabular cup

Technical Field

The application relates to the field of acetabular cup installation, in particular to an acetabular cup installation surgical instrument.

Background

The acetabulum cup is installed by adopting corresponding surgical instruments, and the prior surgical instruments mainly comprise a handle, an installer connecting rod fixedly connected to the handle and a screw joint integrally formed with the installer connecting rod, wherein the screw joint is positioned at the end part of the installer connecting rod, and is connected with a threaded hole on the acetabulum cup through the screw joint on a screw rod during operation, then the acetabulum cup is placed at an acetabulum socket, the handle is hammered by a slide hammer with great force, so that the acetabulum cup is implanted into the acetabulum socket, then the acetabulum cup is finally fixed through a screw, and after the fixation is finished, the surgical instruments are taken down to prepare for the next operation.

As the handle is hammered by a slide hammer during the process of installing the acetabular cup, the acetabular cup can be implanted smoothly. In the hammering process, the acetabulum cup is positioned in the acetabulum socket, and only the acetabulum cup can be tightly propped against the acetabulum socket by hammering, so that the acetabulum cup does not have the trend of relative displacement, and the screw joint is different from the screw joint, so that the screw joint can be continuously pushed inwards by hammering, the acetabulum cup has the trend of relative displacement, and in the inward pushing process, the screw thread at the position of the screw joint can interact with the extreme hole screw thread of the acetabulum cup to generate larger stress, so that the screw joint is easy to damage and deform after long-term use, the performance of a surgical instrument is reduced, and the service life is shortened.

In view of the above-mentioned related art, the inventors have considered that there is a drawback that the thread on the screw joint is easily deformed.

Disclosure of Invention

To reduce the likelihood of deformation of the threads on the screw connection, the present application provides a surgical instrument for acetabular cup installation.

The application provides a surgical instrument is used in installation of acetabular cup adopts following technical scheme:

the utility model provides an acetabular cup installs and uses surgical instrument, includes handle and rigid coupling at the erector connecting rod of handle one end, still includes the screwed joint of demountable installation in the erector connecting rod and keeping away from handle one end, is equipped with on the screwed joint to be used for the blotter tight with the acetabular cup inner wall of installation.

Through adopting above-mentioned technical scheme, the in-process of energetically hammering, if when screwed joint produced the trend of relative acetabular cup inward displacement, the blotter can further support tight acetabular cup, restriction screwed joint further displacement, and hammering power then transmits to acetabular cup through the buffer block on, has avoided hammering power directly to pass through the screw thread contact transmission, has reduced the interact power between the screw thread at screwed joint position and the utmost point hole screw thread of acetabular cup to the screw thread on the screwed joint produces the possibility of warping.

Preferably, the screw joint comprises a cylinder, an inserted rod formed at one end of the cylinder and a threaded rod formed at one end of the cylinder far away from the inserted rod; one end of the installer connecting rod, which is far away from the handle, is inwards provided with a jack, and the inserted rod and the jack are in interference fit.

Through adopting above-mentioned technical scheme, during the installation, aim at inserted bar and jack, through the mode of beating, make inserted bar and jack interference fit, realize the installation, can dismantle the screwed joint as required.

Preferably, a waist-shaped hole penetrates through the installer connecting rod along the radial direction of the installer connecting rod, and the waist-shaped hole is communicated with the jack; an insertion block extending into the waist-shaped hole is processed at one end of the insertion rod, which is far away from the column body, and a reserved space is reserved between the insertion block and the waist-shaped hole.

By adopting the technical scheme, the screw joint is convenient for medical personnel to disassemble; when the screw joint is disassembled, the rod-shaped appliance penetrates through the reserved space, then the rod-shaped appliance is hammered, the rod-shaped appliance is abutted against the insertion block, and finally the screw joint is disassembled.

Preferably, after the insertion rod is in interference fit with the insertion hole, an insertion gap exists between the column body and the end part of the connecting rod of the installer.

Through adopting above-mentioned technical scheme, the setting in grafting clearance makes medical personnel can dismantle and change the screwed joint through the principle of lever in instrument grafting to grafting clearance to adapt to the acetabular cup of different specifications.

Preferably, the buffer pad is in a circular ring shape, is screwed on the screw connector and is tightly attached to the column body.

Through adopting above-mentioned technical scheme, one side and the acetabular cup butt of blotter, opposite side and cylinder butt, this aim at that will set up, the blotter can produce the trend of relative acetabular cup inward displacement at helical joint and restrict helical joint further displacement, makes the hammering power transmit to the acetabular cup on through the blotter to reach the effect of buffering.

Preferably, one side of the cushion pad facing the acetabular cup is provided with a buffering force equalizing structure.

Through adopting above-mentioned technical scheme, increase the contact surface between blotter and the acetabular cup, improve buffering effect.

Preferably, the force-equalizing structure is a force-equalizing hemisphere integrally connected to the side wall of the cushion pad, and one side of the force-equalizing hemisphere, which is far away from the cushion pad, is a matching surface matched with the inner wall of the acetabular cup.

By adopting the technical scheme, the force-equalizing hemisphere can act on the acetabular cup more uniformly, so that local stress is avoided, and the complete structure and the complete function of the acetabular cup are not damaged.

Preferably, the homodyne structure is rigid coupling on the blotter lateral wall and has elastic homodyne ring, and the homodyne ring is by the one side of being close to the blotter to the one side of keeping away from the blotter inwards shrink gradually to keep away from the one side of blotter at the homodyne ring and form the binding off structure that has the curved surface, the binding off structure can be through the partial laminating of curved surface and acetabular cup's inner wall.

By adopting the technical scheme, when the spiral connector generates the trend of inward displacement relative to the acetabular cup, the force-equalizing ring tightly supports the acetabular cup and evenly transmits the hammering force to the acetabular cup, so that the effects of buffering and vibration filtering are achieved, and the interaction force between the threads at the spiral connector and the polar hole threads of the acetabular cup and the reaction vibration force acting on hands of a doctor are reduced.

Preferably, the uniform force structure is a plurality of uniform force pieces which take the threaded rod as the center and are distributed circumferentially, the entire uniform force piece is of an arc-shaped thin-wall structure, one end of the uniform force piece is fixedly connected with the cushion pad, and the other end of the uniform force piece is arranged towards the threaded rod in a bending manner.

Through adopting above-mentioned technical scheme for the one end that the blotter was kept away from to the average power piece can be on the inner wall of acetabular cup better subsides after the acetabular cup installation finishes, evenly transmits impact force, simultaneously, plays good buffering effect.

Preferably, the cushion pad is made of PEEK material.

By adopting the technical scheme, the PEEK has good mechanical properties, the mechanical properties are represented by good rigidity and flexibility, particularly, the fatigue resistance under alternating stress is very outstanding, the PEEK can be compared favorably with alloy materials, and in the process of implanting and hammering the acetabular cup, the buffer cushion made of the PEEK material can be used as a buffer structure, so that the damage to the threads on the screw joint in the hammering process is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the cushion pad can further tightly support the acetabular cup when the spiral joint generates a tendency of inward displacement relative to the acetabular cup, so that the further displacement of the spiral joint is limited, and the hammering force is transmitted to the acetabular cup through the cushion block, so that the hammering force is prevented from being directly transmitted through thread contact, and the possibility of deformation of threads on the spiral joint is reduced;

2. by arranging the force equalizing structure, the contact surface between the cushion pad and the acetabular cup is increased, and the cushion effect is improved;

3. through set up headspace between inserted block and waist type hole, make things convenient for medical personnel to dismantle and change the screwed joint to adapt to the acetabular cup of different specifications.

Drawings

Fig. 1 is a schematic view of the overall configuration of a surgical instrument according to embodiment 1 of the present application;

FIG. 2 is a partially enlarged schematic view of portion A of FIG. 1;

FIG. 3 is an exploded view of the positional and connective relationships between the installer linkage, the screw joint, and the cushion pad;

FIG. 4 is an exploded view of the connection between the bumper pad and the force equalizing hemisphere;

FIG. 5 is an exploded view of the connection between the screw joint, the cushion and the force-equalizing ring in example 2 of the present application;

FIG. 6 is a schematic view showing the structure of the connection among the screw joint, the cushion pad and the equalizing force plate in example 3 of the present application.

Description of the reference numerals: 1. a handle; 11. a carrier plate; 2. installing a connecting rod; 21. a jack; 22. a kidney-shaped hole; 3. a screw joint; 31. a cylinder; 32. a rod is inserted; 33. a threaded rod; 34. inserting a block; 4. a cushion pad; 41. round corners; 5. a force-equalizing hemisphere; 6. a force-equalizing ring; 7. the tablet is a kind of tablet.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses surgical instrument for acetabular cup installation, referring to fig. 1 and 2, the surgical instrument comprises a handle 1, an installer connecting rod 2 fixedly connected to one end of the handle 1, and a screw joint 3 installed at one end, far away from the handle 1, of the installer connecting rod 2, wherein a buffer pad 4 is arranged on the screw joint 3, and when the acetabular cup is installed on the screw joint 3, the buffer pad 4 is extruded between the screw joint 3 and the acetabular cup, so that the screw joint 3 is prevented from being directly and rigidly abutted to the acetabular cup when the screw joint 3 generates a tendency of inward displacement relative to the acetabular cup.

Example 1

Referring to fig. 1, the handle 1 is in a column shape, one end of the handle, which is far away from the installer connecting rod 2, is fixedly connected with a bearing plate 11, and the diameter of the bearing plate 11 is larger than that of the handle 1, so that the bearing area is mainly used for increasing the force bearing area, and medical staff can accurately hammer.

Referring to fig. 2 and 3, the screw joint 3 includes a cylindrical body 31, one end of the cylindrical body 31 being formed with an insert rod 32, and the other end of the cylindrical body 31 being formed with a threaded rod 33; one end of the installer connecting rod 2, which is far away from the handle 1, is inwards provided with a jack 21, and the screw joint 3 and the installer connecting rod 2 are fixed through interference fit of the jack 32 and the jack 21. After the insertion rod 32 is in interference fit with the insertion hole 21, an insertion gap exists between the end part of the connecting rod 2 of the installation device and the column body 31, and due to the arrangement of the insertion gap, medical workers can be inserted into the insertion gap through tools, and the screw joint 3 is detached and replaced through the lever principle so as to adapt to acetabular cups of different specifications.

In order to further facilitate the medical staff to replace the screw joint 3, a waist-shaped hole 22 is formed in the installer connecting rod 2 in a penetrating mode along the radial direction of the installer connecting rod, the waist-shaped hole 22 is communicated with the insertion hole 21, a supporting table is formed at the position where the waist-shaped hole 22 is communicated with the insertion hole 21, and the end portion of the inserting rod 32 abuts against the supporting table. An insertion block 34 which can extend into the kidney-shaped hole 22 is processed at one end of the insertion rod 32 far away from the column 31, and when the insertion block 34 is inserted into the kidney-shaped hole 22, a reserved space is reserved between the insertion block 34 and the kidney-shaped hole 22; when the screw joint 3 is disassembled, the rod-shaped appliance penetrates through the reserved space, and then is hammered to enable the rod-shaped appliance to abut against the insertion block 34, so that the screw joint 3 is finally disassembled.

Referring to fig. 3, the buffer 4 has a ring shape, and is screwed to the screw joint 3 and closely attached to the cylinder 31. The both ends of blotter 4 are fallen and are used for the fillet 41 with acetabular cup inner wall looks butt, because the inner wall of acetabular cup is the curved surface, consequently, the contact with acetabular cup inner wall that blotter 4 that has fallen fillet 41 can be better to provide better cushioning effect.

More specifically, the cushion pad 4 is made of PEEK material, PEEK is a special polymer material, and has high temperature resistance, corrosion resistance and good mechanical properties, and the mechanical properties are represented by good rigidity and flexibility, especially, the fatigue resistance under alternating stress is very outstanding, and can be compared favorably with alloy materials. In-process implanting the hammering to the acetabular cup, blotter 4 made through the PEEK material can regard as buffer structure, reduces the hammering in-process to the destruction of the screw thread on the screwed joint 3, reduces the damage to acetabular cup self utmost point hole screw thread simultaneously, improves acetabular cup surgical instruments's performance and life, guarantees that acetabular cup self structure complete function can not be impaired, increases the success rate of performing the operation.

Referring to fig. 4, since the overall shape of the acetabular cup is hemispherical, after the installer connecting rod 2 is connected with the acetabular cup, only the outer edge part of the cushion pad 4 can be pressed against the inner wall of the acetabular cup, the contact surface is small, and when the handle is hammered, the cushion effect of the cushion pad 4 is limited.

Therefore, the technical problem is solved, a force equalizing structure is integrally arranged on one side, facing the acetabular cup, of the cushion pad 4, and the force equalizing structure and the cushion pad 4 are made of the same material. In the embodiment, the force equalizing structure is a force equalizing hemisphere 5, and when the cushion pad 4 is mounted on the threaded rod 33, the threaded rod 33 penetrates through the force equalizing hemisphere 5 and reserves a part for mounting an acetabular cup. One side of the uniform force hemisphere 5 departing from the cushion pad 4 is a matching surface matched with the inner wall of the acetabular cup, and during hammering, the uniform force hemisphere 5 can act on the acetabular cup more uniformly with force, so that local stress is avoided, and the complete structure and the complete function of the acetabular cup are not damaged.

The implementation principle of the embodiment 1 is as follows: before operation, the acetabulum cup is connected to the screw rod of the screw joint 3 in a threaded manner, then the acetabulum cup is placed in an acetabulum socket, and the bearing plate 11 on the handle 1 is hammered with great force through a sliding hammer, so that the acetabulum cup is implanted into the acetabulum socket; in-process of energetically hammering, if 3 helical joint produce when the trend of relative acetabular cup inward displacement, blotter 4 can further support tight acetabular cup through samming hemisphere 5, the hammering power loops through blotter 4 and samming hemisphere 5 and transmits to acetabular cup on, avoided the hammering power directly to pass through screw thread contact transmission, the interact power between the screw thread at 3 positions of helical joint and the utmost point hole screw thread of acetabular cup has been reduced, thereby the possibility that the screw thread on 3 helical joint produces the deformation has been reduced, and simultaneously, blotter 4 and samming hemisphere 5's setting, still have certain strain and shake effect, can reduce the reaction force that acts on the doctor hand, improve the operation effect.

Example 2

The difference between the present embodiment and embodiment 1 is that, referring to fig. 5, the force-equalizing structure is a force-equalizing ring 6 having a certain elasticity, one side of the force-equalizing ring 6 is fixedly connected to the cushion pad 4, the force-equalizing ring 6 gradually shrinks inward from the side close to the cushion pad 4 to the side away from the cushion pad 4, and a closed-up structure having a curved surface is formed on the side of the force-equalizing ring 6 away from the cushion pad 4, and the closed-up structure can be partially attached to the inner wall of the acetabular cup through the curved surface, when the screw joint 3 tends to move inward relative to the acetabular cup, the force-equalizing ring 6 abuts against the acetabular cup and uniformly transmits the hammering force to the acetabular cup, thereby playing a role of buffering, and reducing the interaction force between the screw thread at the screw joint 3 and the screw thread of the polar hole of the acetabular cup.

Example 3

The difference between the present embodiment and embodiment 1 is that, as shown in fig. 6, the force equalizing structure is a plurality of force equalizing pieces 7 which are circumferentially distributed and centered on the threaded rod 33, the force equalizing pieces 7 are integrally arc-shaped thin-walled structures and have certain elasticity, one end of each force equalizing piece 7 is fixedly connected with the cushion pad 4, and the other end of each force equalizing piece 7 is bent toward the threaded rod 33, so that the end of each force equalizing piece 7, which is far away from the cushion pad 4, can be better attached to the inner wall of the acetabular cup after the acetabular cup is installed, so as to uniformly transmit the impact force, and simultaneously, a good buffering effect is achieved.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an acetabular cup installs and uses surgical instrument, includes handle (1) and rigid coupling at erector connecting rod (2) of handle (1) one end which characterized in that: the acetabulum cup comprises an installation device connecting rod (2) and a handle (1), and is characterized by also comprising a spiral joint (3) which is detachably arranged at one end of the installation device connecting rod (2) far away from the handle (1), wherein the spiral joint (3) is provided with a cushion pad (4) which is used for abutting against the inner wall of the installed acetabulum cup;

the spiral joint (3) comprises a cylinder (31), an inserted rod (32) formed at one end of the cylinder (31) and a threaded rod (33) formed at one end, far away from the inserted rod (32), of the cylinder (31); one end of the installer connecting rod (2) far away from the handle (1) is inwards provided with a jack (21), and the jack (21) is in interference fit with the jack (32);

a waist-shaped hole (22) penetrates through the mounting device connecting rod (2) along the radial direction of the mounting device connecting rod, and the waist-shaped hole (22) is communicated with the insertion hole (21); an insertion block (34) extending into the waist-shaped hole (22) is machined at one end, away from the column body (31), of the insertion rod (32), and a reserved space exists between the insertion block (34) and the waist-shaped hole (22);

after the insertion rod (32) is in interference fit with the insertion hole (21), an insertion gap exists between the column body (31) and the end part of the installer connecting rod (2).

2. An acetabular cup installation surgical instrument as claimed in claim 1, wherein: the buffer pad (4) is in a circular ring shape, is connected to the screw joint (3) through screw threads and is tightly attached to the cylinder (31).

3. An acetabular cup installation surgical instrument as claimed in claim 1, wherein: one side of the cushion pad (4) facing the acetabulum cup is provided with a buffering force equalizing structure.

4. An acetabular cup installation surgical instrument as claimed in claim 3, wherein: the uniform force structure is a uniform force hemisphere (5) integrally connected to the side wall of the cushion pad (4), and one side of the uniform force hemisphere (5) departing from the cushion pad (4) is a matching surface matched with the inner wall of the acetabular cup.

5. An acetabular cup installation surgical instrument as claimed in claim 3, wherein: the uniform force structure is fixedly connected to the side wall of the cushion pad (4) and is provided with an elastic uniform force ring (6), the uniform force ring (6) gradually shrinks inwards from one side close to the cushion pad (4) to one side far away from the cushion pad (4), a closing-up structure with a curved surface is formed on one side far away from the cushion pad (4) in the uniform force ring (6), and the closing-up structure can be attached to the inner wall of the acetabular cup through the curved surface.

6. An acetabular cup installation surgical instrument as claimed in claim 3, wherein: the force equalizing structure is a plurality of force equalizing sheets (7) which are circumferentially distributed by taking the threaded rod (33) as the center, the whole force equalizing sheets (7) are of arc-shaped thin-wall structures, one end of each force equalizing sheet (7) is fixedly connected with the cushion pad (4), and the other end of each force equalizing sheet is bent towards the threaded rod (33).

7. An acetabular cup installation surgical instrument as claimed in claim 1, wherein: the buffer pad (4) is processed by PEEK material.