CN210903316U

CN210903316U - Intramedullary pin pulling-out device convenient for quick replacement

Info

Publication number: CN210903316U
Application number: CN201921414714.1U
Authority: CN
Inventors: 童和安
Original assignee: Hefei Wuyang Medical Devices Co ltd
Current assignee: Hefei Wuyang Medical Devices Co ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-07-03
Anticipated expiration: 2029-08-28

Abstract

The utility model belongs to the technical field of medical treatment, in particular to an intramedullary needle extracting device convenient for quick replacement, which comprises a connecting section, wherein one end of the connecting section is movably connected with one end of a pulling rod through a locking mechanism, one end of the pulling rod, which is far away from the locking mechanism, is arranged as an intramedullary needle connecting part, the head part of the pulling rod, which is arranged at the end part of one end of the pulling rod, is in universal rotation fit with the locking mechanism, and the locking mechanism comprises an inner sleeve and an outer shell; the inner sleeve is internally provided with a hollow accommodating cavity for accommodating the head of the pulling rod, and the radial side wall of the inner sleeve is provided with an inner sleeve side inlet for facilitating the installation of the head of the pulling rod into the accommodating cavity. The utility model discloses a latched device just can be connected dead lever and linkage segment and the quick split of the section of shaking hands or be connected, and the required time at every turn of split or connection is tens seconds at most can be accomplished. The utility model discloses patient's damage risk has been reduced.

Description

Intramedullary pin pulling-out device convenient for quick replacement

Technical Field

The utility model belongs to the technical field of the medical treatment, especially, relate to a device is extracted to intramedullary needle convenient to quick replacement.

Background

Since the fracture is unstable and easily dislocated after reduction, it is fixed in place by necessary means to gradually heal the fracture. The fixation after fracture is generally divided into internal fixation and external fixation, and the external fixation generally comprises a small splint, a plaster bandage, an external fixation bracket, traction, braking, fixation and the like; the internal fixation is fixed by steel plates, steel needles, intramedullary needles, screws and the like for surgical incision.

The intramedullary pin is mainly used for treating femoral and tibial stem fractures and also can be used for treating humeral stem fractures. The internal fixation of long diaphyseal fractures is gradually dominant. After the fracture of the patient is recovered, the intramedullary nail needs to be taken out. Since the intramedullary pin is wrapped by bone marrow, bone substances growing together and the like in the process of rehabilitation of a patient, the intramedullary pin needs to be taken out by an appropriate tool.

In order to conveniently take out the intramedullary pin, most hospitals generally adopt the following method that a threaded hole is arranged at the pulling-out end of the intramedullary pin, one end of a pulling-out component is firstly in threaded connection with one end of a connecting section, the other end of the pulling-out component is in threaded connection with the intramedullary pin, and then the other end of the connecting section is in threaded connection with a longer holding section. In order to secure the threaded connection during surgery, deeper thread segments are typically provided. If the extraction component needs to be disassembled and replaced, the screw thread is generally removed by a holding means, then the connecting section and the extraction component are separated from the intramedullary nail together, and then the proper extraction component can be selected, the selection is completed, and the extraction component needs to be reconnected according to the assembling steps. This process is cumbersome. If the extraction member needs to be replaced again in a subsequent operation, the above steps need to be repeated.

How to connect and disassemble the extraction part and the whole device conveniently and quickly in the extraction operation of the intramedullary needle becomes the problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides an intramedullary pin extracting device convenient for quick replacement. The utility model discloses a be convenient for carry out convenient and fast's connection and split with dead lever and whole extraction device, saved operation time, the utility model has the advantages of reduce the unfavorable risk to patient, saved the unnecessary trouble of doctor in the operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an intramedullary needle extraction element convenient to quick replacement, the device includes the linkage segment, the one end of linkage segment is passed through latched device swing joint with dead man one end and is in the same place, the one end of dead man of keeping away from latched device establishes to intramedullary needle connecting portion.

Preferably, the head of the pulling rod arranged at the end part of one end of the pulling rod and the locking mechanism form universal rotation fit.

Preferably, the locking mechanism comprises an inner sleeve and an outer shell;

the inner sleeve is internally provided with a hollow accommodating cavity for accommodating the head part of the pulling rod, and the radial side wall of the inner sleeve is provided with an inner sleeve side inlet for facilitating the head part of the pulling rod to be arranged in the accommodating cavity;

the outer shell is rotatably sleeved outside the inner sleeve, an outer shell side inlet matched with the inner sleeve side inlet is formed in the radial side wall of the outer shell, and the outer shell rotates to enable the outer shell side inlet and the inner sleeve side inlet to be in two states of being communicated with each other so as to be convenient to load the head of the pulling rod or being staggered so as to seal the head of the pulling rod which is loaded in the inner sleeve;

the axial ends of the inner sleeve and the outer shell, which are connected with the pull rod, are both arranged into an opening shape, and the opening size of the axial opening end of the inner sleeve is smaller than the maximum size of the head of the pull rod, which is arranged in the accommodating cavity.

Preferably, the stem pulling head is arranged in a ball head shape, and the shape of the stem pulling head is matched with the shape of the inner side of the accommodating cavity.

Preferably, the outer surface of the housing is provided as a friction surface.

Preferably, the locking mechanism further includes a rotation limiting mechanism for limiting a rotation position of the housing, and a positioning mechanism for positioning the housing rotated to a set position.

Preferably, the rotation limiting mechanism comprises a limiting hole arranged on the shell body along the circumferential direction and a limiting block fixedly arranged on the outer wall of the inner sleeve, and the limiting block is arranged in the limiting hole to limit the rotation of the shell.

Preferably, the positioning mechanism comprises a radial hole arranged on the inner sleeve, and a top block and a spring which are arranged in the radial hole; the positioning mechanism further comprises a positioning hole arranged on the shell body, and the size of the top block is slightly larger than that of the positioning hole; the radial hole is matched with the positioning hole in position, so that when the shell rotates to the set position, the spring in the radial hole pushes the ejector block out of the positioning hole to position the shell.

Preferably, the pulling rod is provided with a waist through hole and a top hole for assisting the intramedullary pin connecting part to be screwed with the intramedullary pin; the waist through hole is a through hole which is arranged on the peripheral side of the pulling rod and is close to one end of the head of the pulling rod; the top hole is a polygonal groove which is formed in the top end of the head of the pull rod along the axial direction of the pull rod.

The utility model has the advantages that:

(1) in the past, no matter the connection of the pulling rod and the intramedullary needle beating and pulling device or the disassembly of the pulling rod and the intramedullary needle beating and pulling device is realized through screw connection or disassembly, in order to ensure the connection and the fastening, the screw thread sections required to be connected are also deeper, more operation time is required undoubtedly, and the connection process is not stable because the intramedullary needle beating and pulling device is longer. Especially in the case of intramedullary needle extraction, it is sometimes necessary to replace the stem more than once, which requires more than one removal and reassembly, which increases the risk for the patient and is also very inconvenient and cumbersome for the physician.

The utility model discloses through the use of latched device between dead man and the linkage segment can be fast, convenient and safe connection installation, use convenient and easy operation, even need the change dead man of a plurality of times in the operation, the dead man is beaten with the intramedullary needle and is pulled out being connected or the split of device, through going on that latched device all can be convenient, the split is perhaps connected really required connection time ten seconds at most and can be accomplished. The utility model discloses reduced patient's injury risk, practiced thrift operation time, also saved doctor unnecessary energy in the operation simultaneously. And the head of the pulling rod and the locking mechanism form universal rotation fit, so that the intramedullary needle can be conveniently pulled out in the operation process.

(2) The utility model discloses set up hasp mechanism to endotheca and shell, and the shell side entry that sets up on the endotheca side entry that sets up and the shell on the endotheca, the convenient dead man head that will pull out the rod end head locks and holds in the chamber. When the inner sleeve side inlet and the outer shell side inlet are communicated, the head part of the pulling rod can enter and exit the accommodating cavity, when the inner sleeve side inlet and the outer shell side inlet are staggered, the head part of the pulling rod is stably locked into the locking mechanism, and the intramedullary needle can be pulled out by using the device after preparation is completed. This kind of mode only needs to rotate the shell and is less than 360 can put into holding the chamber or take out from holding the chamber fast with the dead man head.

(3) The utility model discloses set up the dead man head into the bulb form, then the dead man head of bulb form rotates in the spherical chamber that holds, and every phenomenon is the running fit comparatively nimble and firm. The cooperation between the bulb-shaped stem pulling head and the stem pulling head ensures that the stem pulling head and the stem pulling head are not easy to deform in the process of pulling the intramedullary nail outwards, and are more convenient and fast compared with threaded connection.

(5) The utility model discloses a use of spacing hole and stopper has restricted shell and endotheca pivoted scope relatively to this scope has just realized the effect of connecting the dead man head and separating through latched device, and it is very convenient to need rotatory 360 degrees of n than threaded connection.

(6) The utility model discloses a use of radial hole, kicking block, spring and locating hole, when the kicking block exposes from the locating hole, endotheca side entry and shell side entry are wrong mutually and are holding the intracavity with dead man head closure to avoid the in-process shell mistake commentaries on classics that uses to enter the mouth and the shell side entry intercommunication with endotheca side.

(7) When the pulling rod and the intramedullary needle are connected, the pulling rod and the intramedullary needle are connected and screwed through the waist through hole or the top hole according to the condition that the intramedullary needle is wrapped by bones and other human tissues. The waist through hole is more convenient to use, so the design position of the waist through hole is close to the head of the dead man as much as possible, and the waist through hole is not used as a top hole.

Drawings

Fig. 1 is a schematic view of the overall structure of the intramedullary nail beating and pulling device.

Fig. 2 is a schematic view of the structure of the connection section and the first short pull-out handle of the present invention.

Fig. 3 is a sectional view of the structure at a in fig. 2 according to the present invention.

Fig. 4 is an enlarged view of the structure B in fig. 1 according to the present invention.

Fig. 5 is a schematic view of the structure of the housing of the present invention.

Fig. 6 is an axial side view of the connection section when the inner sleeve side inlet and the outer sleeve side inlet of the present invention are connected.

Fig. 7 is a schematic view of the lever structure.

Fig. 8 is a schematic view of the lever structure.

Fig. 9 is a schematic view of the lever structure.

Fig. 10 shows another variant of the latch mechanism.

The notations in the figures have the following meanings:

10-connecting section 11-inner sleeve 111-inner sleeve side inlet 112-limiting block 113-radial hole

114-top block 115-spring 14-housing 141-housing side inlet 142-limiting hole

143-positioning hole 20-holding means 21-first short pulling handle 22-second long pulling handle

221-holding hammer 222-stopper 30-pulling rod 31-pulling rod head 32-intramedullary nail connecting part

33-lumbar via hole 34-top hole.

Detailed Description

As shown in figures 1-9, the intramedullary pin beating and pulling device comprises a connecting section 10, the tail end of the connecting section 10 is fixedly connected with a handle section 20, the head end of the connecting section 10 is movably matched with the tail end of a pulling rod 30 through a locking mechanism, and the head end of the pulling rod 30 is provided with an intramedullary pin connecting part 32 for matching with an intramedullary pin.

The pulling rod head 31 arranged at one end of the pulling rod 30 forms universal rotation fit with the locking mechanism. The following is a detailed description of the latch mechanism and the lever 30:

first, locking mechanism

The locking mechanism comprises an inner sleeve 11 and an outer sleeve 14, the outer surface of the outer sleeve 14 is a friction surface, the inner sleeve 11 is internally provided with a hollow accommodating cavity for accommodating the pulling rod head 31, the radial side wall of the inner sleeve 11 is provided with an inner sleeve side inlet 111 which is convenient for installing the pulling rod head 31 into the accommodating cavity, the outer sleeve 14 is rotatably sleeved outside the inner sleeve 11, the radial side wall of the outer sleeve 14 is provided with an outer sleeve side inlet 141 which is matched with the inner sleeve side inlet 111, and the outer sleeve 14 rotates to ensure that the outer sleeve side inlet 141 and the inner sleeve side inlet 111 are communicated so as to be convenient for installing the pulling rod head 31 or are staggered so as to seal the installed pulling rod head 31 in the inner sleeve 11;

the inner sleeve 11 and the axial end of the outer shell 14 connected with the pulling rod 30 are both arranged in an opening shape, and the opening size of the axial opening end of the inner sleeve 11 is smaller than the maximum size of the head 31 of the pulling rod arranged in the accommodating cavity. As shown in fig. 4, which is an enlarged view of the position B in fig. 1, the inner diameter of the opening of the accommodating cavity is much larger than the outer diameter of the joint of the pulling rod 30 and the pulling rod head 31, so that the universal rotation fit can be realized, and one end of the intramedullary needle connecting part 32 on the pulling rod 30 can swing at a maximum angle of eighty degrees through the locking mechanism, so as to meet the surgical requirements.

Second, the pulling rod 30

The stem head 31 is provided in a ball shape, and the shape of the stem head 31 is adapted to the inner shape of the receiving cavity. It is also possible to arrange the catch mechanism and the stem head 31 in the configuration shown in fig. 7-9, but care should be taken here to ensure a certain diameter for safety. The form of the lever 30 used in the present embodiment is the same as that shown in fig. 7.

Furthermore, the pulling rod 30 is provided with a waist through hole 33 and a top hole 34 for assisting the intramedullary pin connecting part 32 to be screwed with the intramedullary pin; the waist through hole 33 is a through hole which is arranged on the peripheral side of the pulling rod 30 and is close to one end of the head 31 of the pulling rod; the top hole 34 is a polygonal groove formed at the top end of the stem head 31 in the axial direction of the stem. When the intramedullary needle is shallow and is wrapped by bone marrow bone substances and the like, the pulling rod 30 is screwed by a slender rod through the waist through hole 33; when the intramedullary pin is deeply covered with bone marrow bone and the like, the screw driver having a swingable head is inserted into the top hole 34 to screw the stem 30.

In addition, in order to ensure that the connection between the pulling rod 30 and the locking mechanism is more stable during the operation, the following steps are also performed:

the latch mechanism further includes a rotation limiting mechanism that restricts the rotational position of the housing 14, and a positioning mechanism that positions the housing 14 rotated to a set position.

1. The rotation limiting mechanism comprises a limiting hole 142 arranged on the shell of the shell 14 along the circumferential direction and a limiting block 112 fixedly arranged on the outer wall of the inner sleeve 11, wherein the limiting block 112 is arranged in the limiting hole 142 so as to limit the rotation of the shell 14.

2. The positioning mechanism comprises a radial hole 113 arranged on the inner sleeve 11, and a top block 114 and a spring 115 which are arranged in the radial hole 113; the positioning mechanism further comprises a positioning hole 143 arranged on the shell of the shell 14, and the size of the top block 114 is slightly larger than that of the positioning hole 143; the radial holes 113 and the positioning holes 143 are arranged in a matched manner, so that when the shell 14 rotates to a set position, the springs 115 in the radial holes 113 push the top blocks 114 out of the positioning holes 143 to position the shell 14. In the embodiment, the end of the top block 114 facing the housing 14 is provided with a spherical surface, so that the housing 14 presses the spherical surface when the housing 14 is rotated. The spherical top of the top block 114 extends into the positioning hole 143 but cannot penetrate through the positioning hole 143. When the shell 14 is rotated during use, when the limiting block 112 rotates to one end of the limiting hole 142, the top block 114 is exposed out of the positioning hole 143, the shell side inlet 141 and the inner sleeve side inlet 111 are staggered, and the pull rod head 31 is sealed in the accommodating cavity; when the housing 14 is rotated and the stopper 112 is rotated to the other end of the stopper hole 142, the top block 114 is pressed by the housing 14, and at this time, the housing-side inlet 141 and the inner housing-side inlet 111 are communicated, and the stem pulling head 31 can freely enter and exit the accommodating cavity.

The connecting section 10 is integrally formed at the respective end faces of the grip section 20. According to the actual needs in the operation, the grip segment 20 comprises a first short pull handle 21 and/or a second long pull handle 22; the first short pulling handle 21 is connected with the connecting section 10 into a whole; one end of the first short pulling handle 21 departing from the connecting section 10 is detachably connected with the second long pulling handle 22; in practice, the first short pulling handle 21 and the second long pulling handle 22 are screwed, and the thread section is long in order to ensure the stability of the connection. The hardness of the materials used by the intramedullary nail beating and pulling device is higher. The second long pulling handle 22 is slidably sleeved with a holding hammer 221, and one end of the second long pulling handle 22 far away from the connecting section 10 is provided with a stopper 222 for limiting the holding hammer 221.

As shown in fig. 10, in another form of the locking mechanism, the stem head 31 is configured as a first buckle ring, and an opening for turning the knob by a thumb and a forefinger is disposed thereon, the inner sleeve 11 is configured as a second buckle ring, the second buckle ring can rotate universally with the connecting section 10 through a bearing, the first buckle ring and the second buckle ring are locked together, and the housing 14 covers the first buckle ring and the second buckle ring, so that the first buckle ring drives the stem 30 to swing within a range limited by the housing 14. When using this structure, it should be noted that the diameter of the first and second retaining rings should not be less than 2 cm to ensure the safety during use.

The operation of the device is described in detail below with reference to the drawings in the examples.

The first short pulling handle 21 and the second long pulling handle 22 of the sterilized intramedullary needle pulling device are installed together before operation, and the first short pulling handle 21 is not connected with any pulling rod 30. After the operation is started, the extraction rod 30 with the appropriate intramedullary needle connecting portion 32 is selected according to the screw hole of the intramedullary needle connecting end portion. The connecting of the extraction rod 30 and the intramedullary nail is completed by utilizing the waist through hole 33 and/or the top hole 34 on the extraction rod 30. The grip 20 is lifted up, the housing 14 is rotated to communicate the inner case side inlet 111 with the housing side inlet 141, the lever head 31 is placed in the accommodating chamber, the housing 14 is rotated, the stopper 112 is rotated to one end of the stopper hole 142, and the top of the top block 114 is exposed from the positioning hole 143 to position the housing 14. When this is completed, the sheath side inlet 141 and the inner sheath side inlet 111 are staggered, and the intramedullary nail can be pulled out.

The material hardness of the intramedullary needle is lower than that of the intramedullary needle striking and extracting device, so that the intramedullary needle connecting part 32 which is more suitable can be replaced due to the damage of the thread of the intramedullary needle in the process of the operation, and the extraction rod 30 needs to be replaced.

The utility model discloses it is also very convenient to change dead man 30 in the intramedullary nail beating and pulling device. The outer shell 14 is rotated for half a turn, the limiting block 112 rotates to the other end of the limiting hole 142, the top block 114 is pressed by the outer shell 14, the outer shell side inlet 141 is communicated with the inner sleeve side inlet 111, and the pull rod 30 and the grip section can be separated. Then, the proper pulling rod 30 is replaced according to the conventional means in the prior art, and the pulling rod 30 and the intramedullary nail are screwed by utilizing the waist through hole 33 and/or the top hole 34; then, the stem drawing head 31 is put into the accommodating chamber from the outer case side inlet 141 and the inner case side inlet 111, and the outer case 14 is rotated to close the stem drawing head 31.

In the process, the first short pulling handle 21 and the second long pulling handle 22 are always connected together, the first short pulling handle 21 and the pulling rod 30 are not required to be detached, the first short pulling handle 21 is also very convenient and fast to connect through the locking mechanism, and possible damage to patients is reduced to the minimum. During the use, if the intramedullary needle is in a shallow position in the marrow, the extraction work of the intramedullary needle can be also carried out by only using the first short extraction handle 21 connected with the extraction rod 30.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a device is extracted to intramedullary needle convenient to quick replacement which characterized in that: the device comprises a connecting section (10), one end of the connecting section (10) is movably connected with one end of a pulling rod (30) through a locking mechanism, and one end of the pulling rod (30) far away from the locking mechanism is arranged to be an intramedullary needle connecting part (32).

2. The intramedullary needle extraction device facilitating quick replacement of claim 1, further comprising: the pull rod head (31) arranged at one end of the pull rod (30) is in universal rotation fit with the locking mechanism.

3. The intramedullary needle extraction device facilitating quick replacement of claim 2, further comprising: the locking mechanism comprises an inner sleeve (11) and an outer shell (14);

a hollow accommodating cavity for accommodating the pull rod head (31) is formed in the inner sleeve (11), and an inner sleeve side inlet (111) for facilitating the pull rod head (31) to be installed in the accommodating cavity is formed in the radial side wall of the inner sleeve (11);

the outer shell (14) is rotatably sleeved outside the inner sleeve (11), a shell side inlet (141) matched with the inner sleeve side inlet (111) is arranged on the radial side wall of the outer shell (14), and the outer shell (14) rotates to enable the shell side inlet (141) and the inner sleeve side inlet (111) to be in two states of communicating so as to be convenient for being installed into the pull rod head (31) or being staggered so as to seal the installed pull rod head (31) in the inner sleeve (11);

the axial ends of the inner sleeve (11) and the outer shell (14) connected with the pulling rod (30) are both arranged to be open, and the opening size of the axial opening end of the inner sleeve (11) is smaller than the maximum size of the head (31) of the pulling rod arranged in the accommodating cavity.

4. The intramedullary needle extraction device facilitating quick replacement of claim 3, further comprising: the stem pulling head (31) is arranged to be in a ball head shape, and the shape of the stem pulling head (31) is matched with the shape of the inner side of the accommodating cavity.

5. The intramedullary needle extraction device facilitating quick replacement of claim 3, further comprising: the outer surface of the housing (14) is configured as a friction surface.

6. The intramedullary needle extraction device facilitating quick replacement of claim 3, further comprising: the locking mechanism further comprises a rotation limiting mechanism for limiting the rotation position of the shell (14) and a positioning mechanism for positioning the shell (14) which rotates to the set position.

7. The intramedullary needle extraction device facilitating quick replacement of claim 6, further comprising: the rotation limiting mechanism comprises a limiting hole (142) which is arranged on the shell body of the shell (14) along the circumferential direction and a limiting block (112) which is fixedly arranged on the outer wall of the inner sleeve (11), wherein the limiting block (112) is arranged in the limiting hole (142) to limit the rotation of the shell (14).

8. The intramedullary needle extraction device facilitating quick replacement of claim 6, further comprising: the positioning mechanism comprises a radial hole (113) arranged on the inner sleeve (11), and a top block (114) and a spring (115) which are arranged in the radial hole (113); the positioning mechanism further comprises a positioning hole (143) arranged on the shell of the shell (14), and the size of the top block (114) is slightly larger than that of the positioning hole (143); the radial hole (113) and the positioning hole (143) are matched in arrangement position, so that when the shell (14) rotates to a set position, the spring (115) in the radial hole (113) ejects the ejector block (114) to the positioning hole (143) to position the shell (14).

9. The intramedullary needle extraction device facilitating quick replacement of claim 2, further comprising: the pulling rod (30) is provided with a waist through hole (33) and a top hole (34) which assist the intramedullary needle connecting part (32) to be screwed with the intramedullary needle; the waist through hole (33) is a through hole which is arranged on the peripheral side of the pulling rod (30) and is close to one end of the head part (31) of the pulling rod; the top hole (34) is a polygonal groove which is formed in the top end of the head (31) of the pull rod along the axial direction of the pull rod.