CN112545627A

CN112545627A - Needle bar assembly for bone fixation and bone external fixation system

Info

Publication number: CN112545627A
Application number: CN202011520386.0A
Authority: CN
Inventors: 徐寒冬; 单存清
Original assignee: Shanghai Lianying Zhirong Medical Technology Co ltd
Current assignee: Shanghai Lianying Zhirong Medical Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-03-26
Anticipated expiration: 2040-12-21
Also published as: CN112545627B

Abstract

The invention relates to a needle bar assembly for bone fixation, comprising a fixation needle, a dressing and a pressure regulating structure. The fixed needle has a first connecting end and a second connecting end, the first connecting end can penetrate the needle channel opened on the patient's skin and be fixedly connected with the patient's bone, and the second connecting end is used for fixedly connecting with the external connector. The dressing can be arranged on the opening of the patient's needle canal, and the position of the dressing can be adjusted along the axial direction of the fixed needle. The pressure adjusting structure is arranged between the dressing and the fixing needle, and the pressure adjusting structure elastically pushes the dressing. The present invention also relates to a bone external fixation system comprising the above-mentioned bone fixation needle bar assembly. The above-mentioned bone fixation needle bar assembly and bone external fixation system can keep the pressing force of the dressing on the patient's skin tissue within a certain range, thereby reducing the friction between the fixed needle and the skin tissue when the patient's limbs move, and the medicine in the dressing can be used. It has a continuous bacteriostatic or bactericidal effect on the needle tract, preventing the occurrence of physical inflammation and biological inflammation from the source.

Description

Needle bar assembly for bone fixation and bone external fixation system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a needle bar assembly for bone fixation and a bone external fixation system.

Background

Compared with the bone internal fixing system, the bone external fixing system has the advantages of simple and convenient operation, small surgical wound and the like, but the fixing needle in the bone external fixing system penetrates through skin tissue to be connected with the bone of a patient, so that needle-path bacterial infection is easily caused, and osteomyelitis can be induced in serious cases. The inflammation of the external fixation system is mainly divided into physical inflammation and biological inflammation, wherein the physical inflammation is mainly caused by friction between a needle and the skin and compression of skin tissues around the needle channel, the biological inflammation is mainly an inflammatory reaction caused by invasion, growth and reproduction of bacteria around the needle channel, and most of the biological inflammation is developed by the physical inflammation. The probability of infection of the external fixation system in different degrees is reported to be as high as 80%, and the popularization and application of the external fixation system are greatly limited.

Disclosure of Invention

In view of the above, it is necessary to provide a needle bar assembly for bone fixation and a bone external fixation system which effectively suppress inflammation in the needle passage, in order to solve the problem that a general bone external fixation system is likely to cause inflammation.

A needle and rod assembly for bone fixation comprising:

the fixing needle is provided with a first connecting end and a second connecting end, the first connecting end can penetrate into a needle channel formed in the skin and flesh of a patient and is fixedly connected with the bone of the patient, and the second connecting end is used for being fixedly connected with an in-vitro connecting piece;

the dressing box can be arranged at the opening of the needle channel of the patient, and the axial position of the dressing box along the fixing needle is adjustable;

the pressure adjusting structure is at least partially arranged between the dressing box and the fixing needles, and the pressure adjusting structure elastically pushes the dressing box.

In one embodiment, the pressure adjusting structure comprises a first elastic member, one end of the first elastic member is abutted with the dressing box, and the other end of the first elastic member is fixedly or adjustably arranged on the fixing needle.

In one embodiment, the pressure regulating structure further comprises an adjustable locking member, the adjustable locking member is arranged on the fixed needle, the adjustable locking member abuts against the other end, away from the dressing box, of the first elastic member, and the axial position of the part, abutted against the first elastic member, of the adjustable locking member is adjustable along the fixed needle.

In one embodiment, the adjustable locking member comprises a locking rod, a pressure regulating bracket and a clamping bead; the locking rod is slidably sleeved on the fixing needle, and one end of the locking rod is abutted against the first elastic piece; the outer surface of the locking rod is provided with at least two clamping positions, and the at least two clamping positions are distributed along the axial direction of the fixing needle; one end of the pressure adjusting support is fixedly arranged on the fixing needle, the other end of the pressure adjusting support supports the clamping beads, and the clamping beads are clamped into one of the clamping positions.

In one embodiment, the pressure adjusting bracket elastically supports the clamping bead, and the clamping bead has a locking position and an avoiding position; the clamping ball moves to a locking position and is clamped into one of the clamping positions, the first elastic piece pushes the locking rod along the axial direction of the fixing needle, and the clamping position on the locking rod pushes the clamping ball to move to the avoiding position.

In one embodiment, the adjustable locking member further includes a second elastic member and a pressure regulating member, the pressure regulating member is disposed on the pressure regulating bracket in an adjustable position, two ends of the second elastic member respectively abut against the clamping bead and the pressure regulating member, and the pressure regulating member adjusts the position relative to the pressure regulating bracket and changes the deformation amount of the second elastic member.

In one embodiment, the pressure regulating member is a pressure regulating nut, the pressure regulating nut is in threaded connection with the pressure regulating bracket, and one end of the pressure regulating nut screwed into the pressure regulating bracket abuts against the second elastic member; the pressure adjusting bracket is provided with pressure adjusting scales, and the pressure adjusting nut corresponds to the pressure adjusting scales when rotating.

In one embodiment, the outer surface of the locking rod is provided with a clamping thread, the clamping thread extends spirally along the axial direction of the fixing needle, and a plurality of clamping positions are respectively formed on a plurality of recesses of the clamping thread along the axial direction of the fixing needle; or the clamping position is a clamping groove formed in the outer surface of the locking rod, and the clamping grooves are distributed at intervals along the axial direction of the fixing needle.

In one embodiment, one end of the pressure adjusting bracket is fixedly arranged on the fixing pin through a set screw, a bolt or a hoop structure.

In one embodiment, the first elastic member is a pressure maintaining spring, a rubber sleeve, or a pair of repulsive magnetic rings.

In one embodiment, the dressing box is provided with a plurality of limiting spring pieces, and the limiting spring pieces are radially distributed at one end of the dressing box close to the needle channel.

A bone external fixation system, comprising an external connector and the needle bar assembly for bone fixation described in any of the above embodiments, wherein the second connecting end of the fixation needle is fixedly connected with the external connector.

In one embodiment, the bone external fixation system further comprises an dressing block, wherein the dressing block is contained in the dressing box, and the dressing block partially protrudes out of one end of the dressing box close to the needle channel.

In one embodiment, the bone external fixation system comprises a plurality of needle bar assemblies for bone fixation, and the second connecting ends of the fixing needles in the plurality of needle bar assemblies for bone fixation are fixedly connected with the external connecting pieces respectively; the external connecting piece is annular or rod-shaped.

Above-mentioned bone is fixed with needle bar subassembly and skeleton external fixation system, the effective fixed of patient's bone can be realized with the external connecting piece cooperation to fixed needle, and pressure regulation structure elasticity supports simultaneously and pushes away the dressing, can keep the dressing to the pressing force of patient skin tissue in certain extent, and then the friction between fixed needle and skin tissue when reducing patient's limbs activity, and the medicine in the dressing can play lasting antibacterial or bactericidal action to the needle way simultaneously. Compared with the conventional measures such as skin disinfection and the like, the needle rod assembly for bone fixation has the advantages of simplicity and convenience in operation, controllable strength, high reliability and the like, and prevents needle tract infection (physical inflammation and biological inflammation) from occurring fundamentally.

Drawings

FIG. 1 is a schematic view of a bone external fixation system according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating an elastic pushing between the locking rod and the dressing by using a spring plate according to an embodiment of the present invention;

fig. 3 is a schematic view of an elastic pushing between the locking rod and the dressing by using a rubber sleeve according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an elastic pushing between the locking rod and the dressing by using a magnetic ring according to an embodiment of the present invention;

FIG. 5 is a schematic view of a pressure regulating bracket according to an embodiment of the present invention;

FIG. 6 is a schematic view of a pressure adjustment bracket secured to a retaining pin by a latch according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating a pressure adjustment bracket according to an embodiment of the present invention fixed to a fixing pin by a hoop structure;

fig. 8 is a schematic structural view of a dressing with a limiting spring piece according to an embodiment of the present invention.

Wherein: 10. a needle bar assembly for bone fixation; 100. a fixing pin; 110. a first connection end; 120. a second connection end; 200. a dressing; 210. a dressing case; 220. a dressing block; 230. a limiting spring piece; 300. a pressure regulating structure; 310. a first elastic member; 311. a reed; 312. a rubber sleeve; 313. a magnetic ring; 320. an adjustable locking member; 321. a lock lever; 322. a pressure regulating support; 323. clamping the beads; 324. a second elastic member; 325. adjusting a pressing piece; 326. pressure regulation scales; 327. a pressure regulating through hole; 328. a third connection end; 329. a fourth connection end; 340. tightening the screw; 350. a bolt; 360. a hoop structure; 20. an extracorporeal connector; 210. a connecting bolt; 30. a patient's bone; 40. skin.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The external bone fixing system has the advantages of simple and convenient operation, small surgical wound and the like. The situation of effectively avoiding needle channel inflammation is a problem to be considered in the use process of the bone external fixation system. The invention provides a needle bar assembly for bone fixation and a corresponding bone external fixation system, which can effectively prevent needle tract infection (physical inflammation and biological inflammation).

As shown in FIG. 1, an embodiment of the present invention provides a needle bar assembly 10 for bone fixation, including a fixation needle 100, a dressing 200, and a pressure adjustment structure 300. The fixing pin 100 is a direct connection element to accomplish bone fixation. Specifically, the fixing needle 100 has a first connecting end 110 and a second connecting end 120, the first connecting end 110 can penetrate through a needle channel formed on the skin and flesh of the patient and is fixedly connected with the bone 30 of the patient, and the second connecting end 120 is used for fixedly connecting with the external connecting piece 20. The dressing 200 contains a drug, the dressing 200 can be placed at the opening of the patient's needle track, and the axial position of the dressing 200 along the fixation needle 100 is adjustable. The pressure regulating structure 300 is at least partially disposed between the dressing 200 and the fixation pins 100, and the pressure regulating structure 300 elastically pushes against the dressing 200, thereby maintaining a relatively stable pressure between the dressing 200 and the skin 40 near the needle tracks. It will be appreciated that the dressing 200 in this embodiment may be an empty 210 dressing cassette, or may be a 210 dressing cassette containing dressing blocks 220.

Above-mentioned fixed needle bar subassembly 10 of using of skeleton, fixed needle 100 can realize patient's bone 30 effective fixed with external connecting piece 20 cooperation, and pressure regulation structure 300 elasticity simultaneously supports and pushes away dressing 200, can keep dressing 200 to the pressing force of patient's skin 40 tissue in certain extent, and then the friction between fixed needle 100 and the skin 40 tissue when reducing patient's limbs activity, and the medicine in dressing 200 can play lasting antibacterial or bactericidal effect to the needle way simultaneously. Compared with the conventional measures such as disinfection of the skin 40 and the like, the needle rod assembly 10 for bone fixation has the advantages of simplicity and convenience in operation, controllable strength, high reliability and the like, and prevents needle tract infection (physical inflammation and biological inflammation) from occurring fundamentally.

As shown in fig. 1, in an embodiment of the present invention, the first connection end 110 of the fixing pin 100 has threads on the upper outer surface thereof, and the first connection end 110 with the threads can be threadedly connected with the patient bone 30, so that the fixing pin 100 can be stably connected with the patient bone 30. The second connecting end 120 of the fixing pin 100 is fixedly connected with the external connecting piece 20 through the connecting bolt 210, so that the stable connection and the detachable characteristic are ensured. In other embodiments of the present invention, the connection between the first connection end 110 of the fixing needle 100 and the patient bone 30 may be an interference connection, a snap connection, or the like; the second connecting end 120 of the fixing pin 100 may be connected to the extracorporeal connecting member 20 by a set screw, a bolt, or a hoop. And optionally, the axial position of the dressing 200 along the fixing needle 100 can be adjusted by directly sliding the dressing 200 on the fixing needle 100 or by adjusting the axial position of the dressing 200 through an additional guiding or mounting structure. As an achievable way, the dressing 200 is provided with a through hole adapted to the fixing needle 100, and the through hole is directly sleeved on the fixing needle 100, so as to ensure the stable connection between the dressing 200 and the fixing needle 100, and simultaneously reduce the volume of the needle rod assembly 10 for bone fixation as much as possible.

The pressure regulating structure 300 is a key structure for maintaining a stable pressure between the dressing 200 and the skin 40 near the needle tract. In an embodiment of the present invention, as shown in fig. 1, the pressure adjustment structure 300 includes a first elastic member 310, one end of the first elastic member 310 abuts against the dressing 200, and the other end of the first elastic member 310 is fixedly or adjustably disposed on the fixing needle 100. When the patient moves to cause the compression between the skin 40 near the needle passage and the dressing 200, the first elastic member 310 can adapt to the elastic deformation of the first elastic member, so that the compression between the skin 40 tissue near the needle passage and the dressing 200 with a heavier degree is avoided, meanwhile, the friction between the skin 40 tissue near the needle passage and the dressing 200 is effectively reduced, and the occurrence of physical inflammation is prevented. Alternatively, as shown in fig. 1 to 4, the first elastic member 310 may be a pressure maintaining spring, a spring sheet 311, a rubber sleeve 312, or a pair of repulsive magnetic rings 313, etc., as long as the elastic connection between the dressing 200 and the fixing needle 100 can be achieved. A first elastic member 310 in the form of a dwell spring is used in fig. 1.

In the above embodiment, the other end of the first elastic member 310 away from the dressing 200 is fixed with respect to the fixing needle 100, and the first elastic member 310 adjusts the pressure between the dressing 200 and the skin 40 near the needle tract by its elastic deformation; or the other end of the first elastic member 310 away from the dressing 200 is adjustable in position relative to the fixing needle 100, the first elastic member 310 can not only adjust the pressure between the dressing 200 and the skin 40 near the needle passage by means of elastic deformation of the first elastic member, but also can further adjust the pressure between the dressing 200 and the skin 40 near the needle passage by means of adjustment of the position of the first elastic member when necessary (for example, the pressure between the dressing 200 and the skin 40 near the needle passage exceeds a set value), so that friction between the skin 40 tissue near the needle passage and the dressing 200 is reduced, and physical inflammation is avoided.

As one way of accomplishing this, as shown in fig. 1-4, the other end of the first resilient member 310, distal from the dressing 200, is positionally adjustable relative to the fixation pin 100. Specifically, the pressure adjustment structure 300 further includes an adjustable locking member 320, the adjustable locking member 320 is disposed on the fixing needle 100, the adjustable locking member 320 abuts against the other end of the first elastic member 310 away from the dressing 200, and a portion of the adjustable locking member 320 abutting against the first elastic member 310 is adjustable along an axial position of the fixing needle 100. The adjustable lock 320 is configured to incrementally change the pressure between the dressing 200 and the tissue of the skin 40 adjacent the needle tract as the position of the adjustable lock 320 is adjusted relative to the stationary needle 100. Alternatively, the adjustable locking member 320 is a locking ring, block or other type of structure that fits over the fixed needle 100.

In one embodiment of the present invention, as shown in fig. 1 and 5, the adjustable locking member 320 includes a locking rod 321, a pressure adjusting bracket 322 and a ball 323. The locking rod 321 is slidably sleeved on the fixing needle 100, and one end of the locking rod 321 is abutted or fixedly connected with the first elastic element 310. The outer surface of the locking rod 321 has at least two fastening positions, and the at least two fastening positions are distributed along the axial direction of the fixing pin 100. The third connecting end 328 of the pressure adjusting bracket 322 is fixedly arranged on the fixing pin 100, the fourth connecting end 329 of the pressure adjusting bracket 322 supports the clamping bead 323, and the clamping bead 323 is clamped in one of the clamping positions. When the locking rod 321 moves along the axial direction of the fixing needle 100 and the clamping bead 323 is clamped into different clamping positions, the deformation amount of the first elastic element 310 changes in a step-like manner, so that excessive pressure and friction between the dressing 200 and the skin 40 tissue of the needle track accessory can be effectively prevented.

In the above embodiment, the positional movement of the locking lever 321 along the axial direction of the fixation needle 100 is done manually by the operator, or triggered by pressure between the dressing 200 and the needle tract attachment skin 40. In an embodiment of the present invention, as shown in fig. 1 and 5, the pressure adjusting bracket 322 elastically supports the clamping bead 323, and the clamping bead 323 has a locking position and an avoiding position. The clamping ball 323 moves to a locking position and is clamped into one of the clamping positions, the first elastic member 310 pushes the locking rod 321 along the axial direction of the fixing needle 100, and the clamping position on the locking rod 321 pushes the clamping ball 323 to move to an avoiding position. When the pushing force between the first elastic member 310 and the locking rod 321 is too large, the clamping position on the locking rod 321 pushes the clamping bead 323 to move to the avoiding position, meanwhile, the locking rod 321 is far away from the dressing 200 along the axial direction of the fixing needle 100, and the clamping bead 323 moves to the locking position under the action of the elastic support and is clamped into a new clamping position. The needle bar assembly 10 for bone fixation according to the present embodiment can accommodate the situation in which the patient has an excessive amount of movement.

Based on the above embodiment, as a way to realize the above, as shown in fig. 1 to 4, the outer surface of the locking rod 321 is provided with a fastening thread, the fastening thread spirally extends along the axial direction of the fixing pin 100, and the fastening thread forms a plurality of fastening positions along a plurality of recesses of the fixing pin 100 in the axial direction, respectively. As another realizable mode, the locking part is a locking groove formed on the outer surface of the locking rod 321, and a plurality of locking grooves are distributed at intervals along the axial direction of the fixing pin 100. It should be noted that "the first elastic member 310 pushes the locking rod 321 in the axial direction of the fixed needle 100, and the clamping position on the locking rod 321 pushes the clamping ball 323 to generate a tendency to move to the avoiding position" is ensured. Specifically, the clamping ball 323 moves to a locking position or an avoiding position in a direction perpendicular to the axial direction of the fixing needle 100, and the concave portion of the clamping thread is arc-shaped, polygonal, or the like, or the clamping groove is semicircular, polygonal, or the like. In other embodiments, the direction of movement of the snap bead 323 is approximately perpendicular to the axial direction of the retaining pin 100, such as between 75 ° and 115 °, or between 60 ° and 120 °. Correspondingly, the clamping beads 323 are also spherical or polygonal, and may be made of metal such as steel or copper, or plastic.

Based on the above embodiment, the snap bead 323 moves to the lock position or the escape position in the direction perpendicular to the axial direction of the fixing needle 100. As shown in fig. 1 and 5, the pressure adjustment bracket 322 is substantially L-shaped. The third connecting end 328 of the pressure adjusting bracket 322 is provided with a through hole to be sleeved on the fixing pin 100, and then is fixed by a set screw 340. As shown in fig. 6-7, the fourth connection end 329 of the pressure adjustment bracket 322 is fixed to the fixing pin 100 by a latch 350 or a hoop structure 360.

The elastic support of the clamping bead 323 by the pressure regulating bracket 322 is the key to ensure that the locking piece is self-adaptive to adjust the position. In an embodiment of the present invention, as shown in fig. 1 to 4, the adjustable locking member 320 further includes a second elastic member 324 and a pressure adjusting member 325, the pressure adjusting member 325 is disposed on the pressure adjusting bracket 322 in an adjustable position, two ends of the second elastic member 324 respectively abut against the clamping bead 323 and the pressure adjusting member 325, and the pressure adjusting member 325 adjusts the position relative to the pressure adjusting bracket 322 and changes the deformation amount of the second elastic member 324. The position of the pressure regulating member 325 can be adjusted to directly adjust the pushing force of the second elastic member 324 against the clamping bead 323, and further adjust the pushing force of the clamping bead 323 against the locking rod 321, and finally adjust the ultimate pressure before the dressing 200 and the skin 40 tissue near the needle passage. The doctor or the patient can adjust the pressing force degree of the dressing 200 through the pressure adjusting member 325 according to the condition of the skin 40 of the patient and the transition of the disease condition. And it can be understood that, in the above embodiment, the first elastic member 310 and the second elastic member 324 are both detachable and replaceable, thereby greatly expanding the pressure adjustment range and meeting the requirements of various patients.

As shown in fig. 1 and 5, the pressure adjusting member 325 is a pressure adjusting nut, the pressure adjusting nut is screwed to the pressure adjusting bracket 322, a pressure adjusting through hole 327 is formed in a fourth connecting end 329 of the pressure adjusting bracket 322, which supports the clamping bead 323, the clamping bead 323 is disposed at one end of the pressure adjusting through hole 327, the other end of the pressure adjusting nut screwed into the pressure adjusting through hole 327 is screwed to the inner side wall of the pressure adjusting through hole 327, the second elastic member 324 is disposed in the pressure adjusting through hole 327, and two ends of the second elastic member 324 are respectively abutted to the clamping bead 323 and the pressure adjusting nut. The pressure adjusting bracket 322 is provided with a pressure adjusting scale 326 at the screwed-in end of the pressure adjusting nut, and the pressure adjusting scale 326 corresponds to the pressure adjusting scale when the pressure adjusting nut rotates. The extreme pressure between the dressing 200 and the needle tract attachment skin 40 tissue is adjusted to facilitate dosing by the physician or patient.

In one embodiment of the present invention, as shown in FIG. 1, the dressing 200 includes a dressing cartridge 210 and a dressing block 220, the dressing block 220 being received within the dressing cartridge 210, the dressing block 220 partially protruding beyond an end of the dressing cartridge 210 proximate the needle track, the dressing block 220 being in direct contact with the skin 40 tissue proximate the needle track. The medicament in the dressing block 220 can perform bacteriostatic or bactericidal effects. Further, as shown in fig. 8, the dressing 200 further includes a plurality of spring stoppers 230, and the spring stoppers 230 are radially distributed at one end of the dressing case 210 near the needle passage. The limiting spring piece 230 is closely attached to the skin 40 of the patient to limit the skin 40 of the patient, so as to further prevent the skin 40 from being squeezed and rubbed with the fixing needle 100, and the pressing force between the limiting spring piece 230 and the skin 40 of the patient can be realized by changing the thickness and the number of the limiting spring pieces 230.

As shown in fig. 1, an embodiment of the present invention further provides an external bone fixation system, which includes an external connector 20 and the needle bar assembly 10 for bone fixation according to any one of the above embodiments, wherein the second connecting end 120 of the fixing needle 100 is fixedly connected to the external connector 20. Further, the bone external fixation system comprises a plurality of needle bar assemblies 10 for bone fixation, and the second connecting ends 120 of the fixing needles 100 in the plurality of needle bar assemblies 10 for bone fixation are fixedly connected with the external connecting piece 20 respectively. The extracorporeal connector 20 is ring-shaped or rod-shaped. Above-mentioned skeleton external fixation system, fixed needle 100 can realize patient's bone 30 effective fixed with external connecting piece 20 cooperation, and pressure regulation structure 300 elasticity simultaneously supports and pushes away dressing 200, can keep dressing 200 to the pressing force of patient's skin 40 tissue in certain extent, and then the friction between fixed needle 100 and the skin 40 tissue when reducing patient's limbs activity, and the medicine in dressing 200 can play lasting antibacterial or bactericidal effect to the needle way simultaneously. Compared with the conventional measures such as disinfection of the skin 40 and the like, the bone external fixation system has the advantages of simplicity and convenience in operation, controllable strength, high reliability and the like, and prevents needle tract infection (physical inflammation and biological inflammation) from occurring fundamentally.

In the needle bar assembly 10 for bone fixation and the bone external fixation system provided in the above embodiments, when the activity of the patient is small, the first elastic member 310 in the form of the pressure maintaining spring can ensure the pressing effect of the dressing block 220 and the skin 40 of the patient in real time. The snug fit of the locking lever 321 and the second resilient member 324 prevents over-compression of the dressing block 220 against the patient's skin 40 when the patient is active for a greater amount of activity. The degree of pressure of the dressing block 220 may be adjusted by the doctor or the patient via the pressure regulator 325 depending on the condition of the patient's skin 40 and the transition of the condition. The specific use method is as follows:

1) driving the thread of the fixing pin 100 into the patient's bone 30 through the patient's skin 40;

2) adjusting the position of the pressure adjusting bracket 322 according to the thickness of the fat and other tissues of the patient to enable the dressing block 220 to be in contact with the skin 40 of the patient, and tightening the set screw 340 to realize the positioning of the pressure adjusting bracket 322;

3) pressing the locking lever 321 downward creates the appropriate pressure between the dressing block 220 and the patient's skin 40, and adjusting the rotary knob 325 while maintaining the position of the locking lever 321 causes the locking lever 321 to achieve a locking effect.

4) The pressure of the first elastic member 310 in the form of a pressure maintaining spring can ensure the pressing effect of the dressing block 220 against the skin 40 of the patient when the patient moves; when the patient moves too much or the pressure of the first elastic member 310 in the form of the holding spring is too high due to other reasons, the locking rod 321 will slide up one thread to break the pressure of the second elastic member 324 to prevent excessive pressing against the patient's skin 40.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. a bone fixation needle bar assembly is characterized in that, comprising:

The fixed needle has a first connecting end and a second connecting end, the first connecting end can penetrate the needle track opened on the patient's skin and be fixedly connected with the patient's bone, and the second connecting end is used for fixing with the external connector connect;

a dressing box, which can be arranged at the opening of the patient's needle canal, and the dressing box is adjustable along the axial position of the fixed needle;

The pressure regulating structure is at least partially disposed between the dressing box and the fixing needle, and the pressure regulating structure elastically pushes the dressing box.

2 . The needle bar assembly for bone fixation according to claim 1 , wherein the pressure regulating structure comprises a first elastic member, one end of the first elastic member is in contact with the dressing box, and the first elastic member is in contact with the dressing box. 3 . The other end of an elastic member is fixed or position-adjustable and disposed on the fixed needle.

3 . The needle bar assembly for bone fixation according to claim 2 , wherein the pressure regulating structure further comprises an adjustable locking member, the adjustable locking member is provided on the fixing needle, and the adjustable locking member is arranged on the fixing needle. 4 . The adjustable locking member abuts against the other end of the first elastic member away from the dressing box, and the part of the adjustable locking member abutting against the first elastic member is adjustable along the axial position of the fixing needle .

4 . The needle bar assembly for bone fixation according to claim 3 , wherein the adjustable locking member comprises a locking rod, a pressure adjusting bracket and a bead; the locking rod is slidably sleeved on the a fixing needle, one end of the locking rod is in contact with the first elastic member; the outer surface of the locking rod has at least two clamping positions, and the at least two clamping positions are along the length of the fixing needle. Axial distribution; one end of the pressure adjusting bracket is fixedly arranged on the fixing needle, the other end of the pressure adjusting bracket supports the bead, and the bead is clamped into one of the clamping positions.

5 . The needle bar assembly for bone fixation according to claim 4 , wherein the pressure adjusting bracket elastically supports the bead, and the bead has a locking position and an escape position; the bead moves to locked position and locked into one of the locking positions, the first elastic member pushes the locking rod along the axial direction of the fixing needle, and the locking position on the locking rod pushes against the locking position The stuck beads tend to move to an avoidance position.

6 . The needle bar assembly for bone fixation according to claim 5 , wherein the adjustable locking member further comprises a second elastic member and a pressure regulating member, and the position of the pressure regulating member is adjustable and provided on the In the pressure adjusting bracket, both ends of the second elastic member are respectively in contact with the bead and the pressure regulating member, and the pressure regulating member adjusts the position relative to the pressure regulating bracket and changes the second elasticity deformation of the piece.

The needle rod assembly for bone fixation according to claim 6, wherein the pressure regulating member is a pressure regulating nut, the pressure regulating nut is threadedly connected to the pressure regulating bracket, and the pressure regulating nut is screwed. One end of the pressure adjustment bracket is in contact with the second elastic member; a pressure adjustment scale is set on the pressure adjustment bracket, and the pressure adjustment nut corresponds to the pressure adjustment scale when rotated.

8 . The needle bar assembly for bone fixation according to claim 5 , wherein a clamping thread is provided on the outer surface of the locking rod, and the clamping thread extends spirally along the axial direction of the fixing needle, so the A plurality of said clamping positions are respectively formed in a plurality of depressions of said clamping thread along the axial direction of said fixing needle; Each of the clamping grooves is distributed at intervals along the axial direction of the fixing needle.

9 . The needle rod assembly for bone fixation according to claim 4 , wherein one end of the pressure adjusting bracket is fixedly arranged on the fixing needle through a set screw, a latch or a hoop structure. 10 .

10. The needle bar assembly for bone fixation according to any one of claims 2-8, wherein the first elastic member is a pressure-holding spring, a reed, a rubber sleeve or a pair of mutually repelling magnetic rings .

11. The needle bar assembly for bone fixation according to any one of claims 1-8, wherein the dressing box is provided with a plurality of limit spring pieces, and the plurality of limit spring pieces are radially distributed on the dressing box. The dressing box is close to one end of the needle track.

12. An external fixation system for bones, characterized in that it comprises an extracorporeal connector and the needle rod assembly for bone fixation according to any one of claims 1-11, wherein the second connection end of the fixation needle is connected to the The external connector is fixedly connected.

13 . The bone external fixation system according to claim 12 , wherein the bone external fixation system further comprises a dressing block, the dressing block is accommodated in the dressing box, and the dressing block partially protrudes from the outside. 14 . One end of the dressing box close to the needle track.

14. The bone external fixation system according to claim 12 or 13, wherein the bone external fixation system comprises a plurality of the bone fixation needle bar assemblies, and all the bone fixation needle bar assemblies in the plurality of bone fixation needle bar assemblies. The second connecting ends of the fixing needle are respectively fixedly connected with the external connecting piece; the external connecting piece is annular or rod-shaped.