CN215079514U

CN215079514U - Minimally invasive bone cement hollow nail and hollow nail assembly thereof

Info

Publication number: CN215079514U
Application number: CN202120474052.8U
Authority: CN
Inventors: 申春林; 周中位; 罗爱民
Original assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Current assignee: Beijing Zhong An Tai Hua Science & Technology Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-12-10
Anticipated expiration: 2031-03-04

Abstract

The application relates to a minimally invasive bone cement hollow nail and a hollow nail assembly. The hollow nail comprises a nail body, wherein a nail hole penetrating through the nail body is formed in the axis of the nail body, a plurality of side holes communicated with the nail hole are formed in the outer surface of the nail body, and an included angle formed between each side hole and the axis direction of the tail of the nail body is an acute angle; the hollow nail assembly comprises a hollow nail, an injector used for injecting bone cement into the hollow nail and a connecting rod used for connecting the hollow nail and the injector, the connecting rod is arranged in a hollow mode, and two ends of the connecting rod are connected to the injector and the hollow nail respectively. The device can increase the resistance to plucking between backbone and the nail body, when the backbone is bent repeatedly and is stretched the activity, can not take place to become flexible to can increase the fastness between backbone and the nail body, and, when the hollow nail got into the backbone, can prevent that the broken bone that is located the head of the nail body from entering into the side opening.

Description

Minimally invasive bone cement hollow nail and hollow nail assembly thereof

Technical Field

The application relates to the technical field of medical instruments, in particular to a minimally invasive bone cement hollow nail and a hollow nail assembly thereof.

Background

With the aging population, osteoporosis becomes a common problem for the elderly, and the problem is particularly prominent in China. Osteoporosis is caused by low bone mass of patients, damage of bone microstructures, increase of bone fragility, easy occurrence of fracture and other diseases, and brings serious influence on treatment of spine degenerative diseases.

The existing operation access mode selects an open operation to treat patients suffering from osteoporosis, the open operation can cause large operation incision to the patients, the wound is not easy to heal, most patients suffering from osteoporosis are middle-aged and old people, the wound of the middle-aged and old people is not easy to heal, and the recovery is slow, so that the time of getting off the bed of the patients is increased. At present, when performing the operation, in order to reduce the incision of operation, common backbone hollow nail is fixed the backbone, and the nail hole of current backbone hollow nail is seted up along the epaxial of backbone hollow nail, and the nail hole runs through whole backbone hollow nail, injects bone cement in the nail hole, and backbone hollow nail is fixed through bone cement, because bone cement fills the effect harmfully clinically, leads to the backbone to bend under the shearing action of stretching the activity repeatedly, easily takes place to become flexible, and then leads to the fracture.

SUMMERY OF THE UTILITY MODEL

To the deficiency that prior art exists, the utility model aims to provide a wicresoft bone cement hollow nail and hollow nail combination spare thereof, the device can have the advantage that can increase the fastness between hollow nail and the backbone.

On the one hand, the application provides a hollow nail of wicresoft bone cement adopts following technical scheme:

the utility model provides a hollow nail of minimally invasive bone cement, contains the nail body, seted up on the axis of the nail body and run through the nail hole of the nail body, the surface of the nail body seted up a plurality ofly with the side opening of nail hole intercommunication, the side opening with contained angle between the afterbody axis direction of the nail body is the acute angle setting.

By adopting the technical scheme, the nail body is in threaded connection with the spine of a patient, then bone cement is injected through the nail hole, the bone cement flows out of the nail hole and the side hole, after the bone cement is solidified, the anti-pull-out capacity between the spine and the nail body is increased, and when the spine is repeatedly bent and extended, looseness cannot occur, so that the firmness between the spine and the nail body can be increased, meanwhile, the included angle is arranged in an acute angle, and when the hollow nail enters the spine, broken bones at the head of the nail body can be prevented from entering the side hole; by using the hollow nail, a minimally invasive small incision is adopted for the operation mode of the osteoporosis patient, the mode has the advantages of short operation time and less bleeding, and the complication is relatively low in an open mode. Therefore, the present application can have the advantage of being able to increase the firmness between the cannulated nail and the spine.

Preferably, the included angle is set at 50-60 °.

By adopting the technical scheme, when the hollow nail enters the vertebral column, small broken bones can be generated and are arranged at an included angle of 50-60 degrees, so that the broken bones can be prevented from entering the side holes.

Preferably, the outer surface of the nail body is provided with a first thread and a second thread which are vertically arranged, the first thread is positioned on one side of the tail of the nail body, and the thread pitch of the first thread is smaller than that of the second thread.

Through adopting above-mentioned technical scheme, when the hollow nail was installed on the backbone, first screw thread was located the cortex bone, and the second screw thread is located cancellous bone, because the pitch of first screw thread is less to make the combination of cortex bone and the nail body inseparabler, thereby increased the fastness of hollow nail.

Preferably, the pitch of the second thread is an integer multiple of the pitch of the first thread.

Through adopting above-mentioned technical scheme, the nail body is installed on cancellous bone in second screw thread department, when rotatory nail body, can keep this hollow nail to advance with the pitch of second screw thread to guarantee the speed of installing hollow nail.

Preferably, the head of the nail body is provided with a self-tapping port.

Through adopting above-mentioned technical scheme, through the setting of self tapping mouth, can conveniently enter into the hollow nail on the backbone.

Preferably, the tail of the nail body is provided with a U-shaped groove for fixing a nail plug screw, the bottom of the U-shaped groove is communicated with the nail hole, and the inner peripheral surface of the U-shaped groove is provided with a first internal thread.

Through adopting above-mentioned technical scheme, through the setting in U type groove, can realize the installation to the nail plug screw.

Preferably, the inside in U type groove is provided with the negative angle screw thread that the oncomelania stopper matches.

Through adopting above-mentioned technical scheme, through the setting of negative angle screw thread, can prevent effectively that the afterbody of the nail body from outwards expanding after screwing in the nail plug, prevent that the nail plug from withdrawing from behind the inflation of the afterbody of the nail body.

Preferably, the nail body in the middle part in U type groove is provided with the rupture groove, the rupture groove is located the middle part in U type groove.

Through adopting above-mentioned technical scheme, through the setting of breaking groove, after the installation nail plug screw, the convenient nail body that will be located the backbone outside breaks.

On the other hand, the application provides a hollow nail combination piece, adopts following technical scheme:

a hollow nail assembly comprises the hollow nail, and further comprises an injector used for injecting bone cement into the hollow nail and a connecting rod used for connecting the hollow nail and the injector, wherein the connecting rod is arranged in a hollow mode, and two ends of the connecting rod are respectively connected to the injector and the hollow nail.

Through adopting above-mentioned technical scheme, install the connecting rod on the hollow nail earlier, then install the syringe on the connecting rod, through the syringe with the bone cement in the syringe through the connecting rod inject into the hollow nail in.

Preferably, both ends of the outer peripheral surface of the connecting rod are provided with external threads, a connecting piece is rotatably connected to an injection port of the injector, the connecting piece is provided with a first internal thread, one external thread of the connecting rod is used for being in threaded connection with the connecting piece, the other external thread of the connecting rod is used for being in threaded connection with the U-shaped groove, and one end, far away from the injector, of the connecting rod is provided with an insertion pipe used for being inserted into the hollow nail.

Through adopting above-mentioned technical scheme, connecting rod threaded connection is in U type inslot to realize the installation of connecting rod and hollow nail, through the setting of connecting piece, can realize the installation of connecting rod and syringe.

Preferably, a 90-degree bent injection tube is arranged at an injection port of the injector, one end of the injection tube is fixedly arranged on the injector, and the connecting piece is rotatably connected to one end, far away from the injector, of the injection tube.

By adopting the technical scheme, the injector is positioned on one side of the spine of the patient, so that the bone cement can be conveniently injected to the hollow rod from the outer side.

In summary, the present application has the following beneficial effects:

1. in the application, through the arrangement of the side holes, after the bone cement is solidified, the anti-pulling capacity between the spine and the nail body is increased, and when the spine is repeatedly bent and stretched, looseness cannot occur, so that the firmness between the spine and the nail body can be increased;

2. in the application, the screw pitches of the second threads are integral multiples of those of the first threads, when the hollow nail is installed on a spine, the first threads are located on cortical bones, the second threads are located on cancellous bones, and the screw pitches of the first threads are small, so that the cortical bones and the nail body are combined more tightly, and the firmness of the hollow nail is improved;

3. in this application, through the setting of connecting rod and syringe, conveniently inject bone cement into hollow nail.

Drawings

FIG. 1 is a schematic structural view of a side hole of a hollow nail shown in the present application with a part of the shank broken away;

FIG. 2 is a side view of the hollow spike of the present application;

FIG. 3 is an enlarged partial view of portion A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a schematic structural view of the hollow staple assembly of the present application;

fig. 6 is a schematic structural view of a connecting rod in the present application.

In the figure: 1. a nail body; 2. a nail head; 3. a nail rod; 31. a first thread; 32. a second thread; 321. self-tapping; 4. nailing tail; 41. a U-shaped groove; 42. a first internal thread; 43. a negative angle thread; 44. breaking the groove; 5. nailing holes; 51. a side hole; 6. an injector; 61. an injection tube; 62. a connecting member; 7. a connecting rod; 71. inserting a pipe; 72. and (4) a bump.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1 and 2, a minimally invasive bone cement hollow nail disclosed by the application comprises a nail body 1, wherein the nail body 1 is in threaded connection with a spine, a nail hole 5 is formed in the axis of the nail body 1, the nail hole 5 penetrates through the whole nail body 1, a side hole 51 communicated with the nail hole 5 is formed in the outer peripheral surface of the nail body 1, an included angle between the side hole 51 and the tail of the nail body 1 is 50-60 degrees, and can be set to be 50 degrees, 55 degrees, 60 degrees and the like, in the embodiment, the included angle is specifically set to be 55 degrees, when the hollow nail is installed, broken bones are generated at the head of the nail body 1, the side hole 51 is obliquely arranged towards the tail of the nail body 1 through the side hole 51, so that the side hole 51 can be prevented from being blocked by the broken bones, the perfusion effect of the bone cement and the dispersibility of the bone cement are improved, and when the spine repeatedly bends and stretches, looseness cannot occur; after the nail body 1 is mounted on the spine of the patient, the bone cement enters through the nail hole 5 and then flows out through the head of the nail hole 5 and the side hole 51, and after the bone cement is solidified, the firmness of the hollow nail can be improved by arranging the side hole 51.

The shank 1 comprises a head 2, a tail 4 and a shank 3 between the head 2 and the tail 4. The outer circumference of the nail rod 3 is provided with a first thread 31 and a second thread 32, and the first thread 31 is positioned at one end of the nail rod 3 close to the nail tail 4. The pitch of the first thread 31 is smaller than that of the second thread 32, and the pitch of the second thread 32 is an integral multiple of that of the first thread 31, and specifically, the first thread 31 is a double-thread, and one of the threads of the first thread 31 is connected with the second thread 32; it can also be set that the first thread 31 is a single thread, the first thread 31 and the second thread 32 are connected end to end, after the nail body 1 is installed on the spine of a patient, the first thread 31 is located in the cortical bone, the second thread 32 is located in the cancellous bone, and the first thread 31 has a smaller pitch, so that the cortical bone and the nail body 1 can be combined more tightly, and the firmness of the hollow nail is increased.

Referring to fig. 2 and 3, the nail head 2 is tapered, the nail head 2 and the nail rod 3 are integrally formed, the side hole 51 is opened at one end of the nail rod 3 close to the nail head 2, and the side hole 51 is located at the groove of the second thread 32; one end of the second thread 32, which is far away from the first thread 31, extends to the nail head 2, the second thread 32 is provided with a self-tapping hole 321 at the nail head 2, and the sharpness of the head of the second thread 32 can be increased through the arrangement of the self-tapping hole 321, so that the hollow nail can conveniently enter the spine.

Referring to fig. 2 and 4, the nail tail 4 and the nail rod 3 are integrally formed, the nail tail 4 and the nail rod 3 are in arc transition connection, the nail rod 3 is a cylinder, the diameter of the nail rod 3 is larger than that of the nail body 1, a U-shaped groove 41 is formed in one side of the nail rod 3, which is far away from the nail body 1, and the bottom of the U-shaped groove 41 is communicated with the nail hole 5; the inner peripheral surface of U type groove 41 is provided with first internal thread 42, is used for threaded connection nail plug screw (not drawn) in the U type groove 41, and the inside of U type groove 41 is provided with and follows closely plug screw assorted negative angle screw 43, and negative angle screw 43 is located the one end that nail body 1 was kept away from to first internal thread 42, through the setting of negative angle screw 43, can effectively prevent that the afterbody of nail body 1 from outwards expanding after screwing in the nail plug screw, prevents that the nail plug screw from withdrawing from after the inflation of the afterbody of the nail body 1. The middle part of the outer peripheral surface of the nail tail 4 is provided with a wedge-shaped breaking groove 44, and through the arrangement of the breaking groove 44, after the nail plug is installed, the tail part of the nail tail 4 positioned outside the spine is conveniently broken, so that part of the nail tail 4 is prevented from being exposed outside the spine.

The specific working principle in this application: the hollow nail is installed on the spine at the beginning of the nail head 2, then the bone cement is injected into the spine through the nail hole 5, the bone cement flows out from the head of the nail hole 5 and the side hole 51, after the bone cement is solidified, the firmness of the hollow nail can be increased through the arrangement of the side hole 51, the nail plug is installed in the U-shaped groove 41 at last, and the tail of the nail tail 4 can be easily broken through the arrangement of the breaking groove 44 at last.

Referring to fig. 5 and 6, the present application further discloses a hollow nail assembly comprising the hollow nail, a syringe 6 and a connecting rod 7. The connecting rod 7 can be installed on the hollow nail, and with hollow nail inner chamber intercommunication, syringe 6 can be installed on connecting rod 7, and syringe 6 injects bone cement into the hollow nail through connecting rod 7.

An injection tube 61 is arranged at the injection port of the injector 6, the injection tube 61 is arranged in a 90-degree bending way, and the injector 6 is positioned at one side of the spine of the patient, so that the bone cement can be conveniently injected into the hollow nail at the outer side.

The connecting rod 7 is arranged in a hollow mode, external threads are formed in two ends of the outer peripheral surface of the connecting rod 7, second internal threads are formed in the inner peripheral surface of the U-shaped groove 41, the second internal threads are located on one side, away from the first internal threads 42, of the negative-angle threads 43, one external thread of the connecting rod 7 is matched with the second internal threads and used for being threaded in the U-shaped groove 41, and therefore installation of the connecting rod 7 and the hollow nail is achieved; one end of the injection tube 61, which is far away from the injector 6, is rotatably connected with a connecting piece 62, the inner circumferential surface of the connecting piece 62 is provided with a third internal thread, and the other external thread of the connecting rod 7 is matched with the third internal thread and is used for being screwed in the connecting piece 62, so that the detachable connection between the connecting rod 7 and the injector 6 is realized; be provided with lug 72 on the connecting rod 7, lug 72 is located between two external screw threads of connecting rod 7, and lug 72 is located the one end that is close to syringe 6, through the setting of lug 72, conveniently with connecting rod 7 threaded connection on the hollow nail.

The specific working principle in this application: after the hollow nail is mounted on the spine, the connecting rod 7 is screwed into the U-shaped groove 41 by rotating the protrusion 72, the connecting rod 7 is connected to the syringe 6 by the connecting member 62, and then bone cement is injected into the nail shaft 3.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, 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 a hollow nail of minimally invasive bone cement, contains the nail body (1), seted up on the axis of the nail body (1) and run through nail hole (5) of the nail body (1), its characterized in that, the surface of the nail body (1) seted up a plurality of with side opening (51) of nail hole (5) intercommunication, side opening (51) with contained angle between the afterbody axis direction of the nail body (1) is the acute angle setting.

2. The minimally invasive bone cement hollow nail according to claim 1, wherein the included angle is set at 50-60 °.

3. The minimally invasive bone cement hollow nail according to claim 2, characterized in that the outer surface of the nail body (1) is provided with a first thread (31) and a second thread (32) which are arranged up and down, the first thread (31) is positioned at one side of the tail part of the nail body (1), and the thread pitch of the first thread (31) is smaller than that of the second thread (32).

4. A minimally invasive bone cement cannulated nail according to claim 3, wherein the pitch of the second thread (32) is an integer multiple of the pitch of the first thread (31).

5. The minimally invasive bone cement hollow nail according to claim 4, characterized in that the head of the nail body (1) is provided with a self-tapping orifice (321).

6. The minimally invasive bone cement hollow nail according to claim 5, characterized in that a U-shaped groove (41) for fixing a nail plug screw is formed at the tail of the nail body (1), the bottom of the U-shaped groove (41) is communicated with the nail hole (5), and a first internal thread (42) is formed on the inner circumferential surface of the U-shaped groove (41).

7. The minimally invasive bone cement hollow nail according to claim 6, characterized in that the inside of the U-shaped groove (41) is provided with a negative-angle thread (43) matching with the nail screw plug.

8. The minimally invasive bone cement hollow nail according to claim 7, characterized in that the nail body (1) is provided with a breaking groove (44) in the middle of the U-shaped groove (41), and the breaking groove (44) is located in the middle of the U-shaped groove (41).

9. A hollow nail assembly comprising a hollow nail according to any one of claims 1 to 8, further comprising an injector (6) for injecting bone cement into the hollow nail and a connecting rod (7) for connecting the hollow nail and the injector (6), the connecting rod (7) being arranged in a hollow manner, the two ends of the connecting rod (7) being connected to the injector (6) and the hollow nail, respectively.

10. A hollow nail assembly according to claim 9, wherein both ends of the outer peripheral surface of the connecting rod (7) are provided with external threads, a connecting piece (62) is rotatably connected to the injection port of the injector (6), the connecting piece (62) is provided with a first internal thread, one external thread of the connecting rod (7) is used for being screwed on the connecting piece (62), the other external thread is used for being screwed in the U-shaped groove (41), and one end of the connecting rod (7) far away from the injector (6) is provided with a plug-in pipe (71) for being plugged into the hollow nail.