CN110495943A - A percutaneous minimally invasive fracture reducer - Google Patents

Abstract

The invention discloses a percutaneous minimally invasive fracture reducer, which comprises a knob, a fixed sleeve, a transmission rod, a pin, a movable pull rod, a fastening nut, a fixed pull rod and a support assembly; The transmission rod is connected, the other end of the transmission rod is connected with the movable pull rod through a pin, and the other end of the movable pull rod is respectively hinged with the rotating block 1 and 2 through rivets 1 and 2; the fastening nut is fixed in the fixed sleeve and connected with the fixed pull rod , the fixed tie rod is a hollow structure, the movable tie rod passes through the middle of the fixed tie rod, and the other end of the fixed tie rod is respectively hinged with the rotating blocks 3 and 4 through rivets 3 and 4; the other ends of the rotating blocks 1 and 4 are connected with rivets 8 and 7 respectively The support plate two is hinged; the other ends of the rotating blocks two and three are respectively hinged with the support plate one through rivets six and five. The invention utilizes the principle of leverage to realize the functions of the fracture reducer to open, support, retract and withdraw, and meets the requirements of minimally invasive medical operations.

Description

A percutaneous minimally invasive fracture reducer

technical field

The invention relates to the technical field of medical devices, in particular to a reduction device for bone injuries, especially vertebral fractures, in particular to a percutaneous minimally invasive fracture reduction device.

Background technique

As far as vertebral compression fractures are concerned, there are currently three commonly used methods of reduction: percutaneous pedicle screw fixation, percutaneous vertebroplasty (PVP) and percutaneous kyphoplasty (PKP). The traditional pedicle screw technology is to fix the normal pedicle through the screw-rod system, perform indirect reduction on the fractured vertebral body, and re-stabilize the mechanical function of the spine; vertebroplasty (PVP) is to make an approximately 5mm pedicle on the skin. Small incision, and then use a puncture needle to puncture into the fractured vertebral body through this small incision, and inject bone cement into the vertebral body; while PKP first uses the method of balloon expansion to reset the vertebral body, forming a space inside the vertebral body, and then injecting bone cement .

In order to better restore the height of the vertebral body, various minimally invasive reduction techniques have emerged, such as SpineJack, Sky Bone Expansion System Kyphoplasty (SKP), Opti Mesh Vertebroplasty, and Bracket Vertebroplasty (VBS) and lantern skeleton vertebroplasty. SpineJack is a spinal jack, which is a kind of vertebral body spreader. Its application is to spread through the pedicle channel to the inside of the vertebral body through the upper and lower push plates, so that the compressed vertebral body can restore its shape and height, and then infusion Bone cement is used for fixation; SKP uses a bone expander to replace the balloon expansion of PKP. The expansion strength of the bone expander is greater than that of the balloon; OptiMesh is an implantable built-in mesh container that is transpedicular. The approach creates a cavity in the cone, implants a capsule and fills it with grafted bone or bone cement and other supporting materials; the lantern skeleton-type vertebroplasty is a memory alloy vertebroplasty frame of different specifications, using the "recovery memory" function of the alloy To achieve fracture reduction. However, none of the above technologies can provide a more uniform stretching and reset force, and it is difficult to accurately control the reset height according to actual needs and can only be stretched but cannot be retracted and withdrawn.

Therefore, it is necessary to adopt a structure that is simple and easy to operate, and can be implanted into the vertebral body or between the vertebral bodies through a minimally invasive channel to provide uniform mechanical support for the bone, and can accurately control the reset height according to actual needs, and can also be retracted to meet the needs of the bone. A reducer required for surgical treatment.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a reset device with simple structure, convenient operation, uniform expansion and high controllability for percutaneous minimally invasive implantation, so as to meet the requirements of minimally invasive medical operations. The utility model can simplify operation operation and improve operation curative effect, specifically a percutaneous minimally invasive fracture reducer.

A percutaneous minimally invasive fracture reducer, including a knob, a fixed sleeve, a transmission rod, a pin, a movable pull rod, a fastening nut, a fixed pull rod and a support assembly, the support assembly includes a link mechanism, a rivet, and a support plate, The link mechanism includes rotating blocks 1, 2, 3, 4, the rivets include rivets 1, 2, 3, 4, 5, 6, 7, and 8, and the support plates include support plates 1 and 2; The knob is set on the fixed sleeve, and is connected with the transmission rod set in the fixed sleeve through threads, and the other end of the transmission rod is connected with one end of the movable pull rod through a pin, and the other end of the movable pull rod is provided with two rivet holes , through rivet 1 and rivet 2 respectively hinged with one end of rotating block 1 and rotating block 2 in the linkage mechanism; the fastening nut is fixed in the hole of the fixing sleeve and is threadedly connected with one end of the fixing rod, so The fixed pull rod is a hollow structure, the movable pull rod passes through the middle of the fixed pull rod, and the other end of the fixed pull rod is provided with two rivet holes, through which the three rivets and the four rivets respectively connect with the rotating blocks three and four in the linkage mechanism. One end of rotating block 1 and rotating block 4 are hinged with the groove of supporting plate 2 through rivet 8 and rivet 7 respectively; the other ends of rotating block 2 and rotating block 3 are respectively connected with supporting The slot of plate one is hinged.

In order to increase frictional force and facilitate holding, a handle is provided on the fixed sleeve.

In order to limit the stroke of the movable pull rod, thereby controlling the degree of opening and closing of the support plate, a hole is opened on the fixed sleeve, and the pin passes through the hole to connect the transmission rod with the movable pull rod. The hole can limit the stroke of the movable pull rod, thereby controlling the support The degree of opening and closing of the plate, the fixed sleeve is provided with a positioning groove for the positioning of the knob.

In order to ensure that the support plate can be stretched and folded, the material of the movable tie rod, the fixed tie rod, and the support assembly is medical titanium alloy or cobalt-chromium-molybdenum alloy material or other materials that can meet the performance.

Through this technical means, the beneficial technical effects obtained by the present invention are as follows: firstly, through sufficient preoperative evaluation, excluding surgical contraindications, and determining the type of reducer required by the patient; Inside the center of the vertebral body, implant the unexpanded bone reducer through the channel to make it reach the proper position in the vertebral body, then turn the knob to expand the bone reducer, and restore the height and shape of the compressed fractured vertebral body, specifically It is reflected in the following aspects:

1. Implantation through the percutaneous minimally invasive channel can achieve minimal trauma to solve the patient's illness. After the bone reducer is implanted in the vertebral body through the minimally invasive channel, it can be evenly stretched in both directions up and down, increasing the contact between the surface of the bracket and the bone. The contact surface of the tissue interface solves the problems that the existing technology cannot provide uniform expansion and the interface stress between the surface of the bracket and the bone tissue is too large;

2. The resetter adopts the principle of lever adjustment, which realizes the expansion of the support plates in two directions at the same time, and can provide uniform support force to realize the fracture reduction of the compressed vertebral body. The resetter has good controllability and can be adjusted according to actual needs. Adjustable reset height, easy to operate;

3. The reset device is made of medical titanium alloy or cobalt-chromium-molybdenum alloy material or other materials that can meet the performance.

Description of drawings

Fig. 1 is a schematic diagram of the exploded structure of the percutaneous minimally invasive fracture reducer of the present invention;

Fig. 2 is the structural representation of the parts of the percutaneous minimally invasive fracture reducer of the present invention;

3 is a schematic diagram of the internal structure of the percutaneous minimally invasive fracture reducer of the present invention;

Fig. 4 is the structural representation of fixed sleeve;

Fig. 5 is the structural schematic diagram of movable tie rod;

Fig. 6 is the structural representation of fixed pull rod;

Fig. 7 is a structural schematic diagram of an unassembled support assembly;

Fig. 8 is a structural schematic diagram of the assembled support assembly.

As shown in the figure: 1-knob, 2-fixed sleeve, 201-handle, 202-hole, 203-positioning groove, 3-transmission rod, 4-pin, 5-active pull rod, 6-fastening nut, 7- Fixed tie rod, 8-link mechanism, 801-rotating block 1, 802-rotating block 2, 803-rotating block 3, 804-rotating block 4, 9-rivet, 901-rivet 1, 902-rivet 2, 903-rivet 3. 904-rivet 4, 905-rivet 5, 906-rivet 6, 907-rivet 7, 908-rivet 8, 10-support plate, 1001-support plate 1, 1002-support plate 2.

Detailed ways

The principles and features of the present invention are described below in conjunction with the examples, which are only used to explain the present invention, and are not intended to limit the scope of the present invention.

As shown in Figure 1-8, a percutaneous minimally invasive fracture reducer includes a knob 1, a fixed sleeve 2, a transmission rod 3, a pin 4, a movable rod 5, a fastening nut 6, a fixed rod 7 and a support assembly , the support assembly includes a link mechanism 8, rivets 9, and a support plate 10, the link mechanism 8 includes rotating blocks one, two, three, and four, and the rivets 9 include rivets one, two, three, four, and five , six, seven, eight, the support plate 10 includes support plates one and two; the knob 1 is sleeved on the fixed sleeve 2, and is connected with the transmission rod 3 arranged in the fixed sleeve 2 through threads, and the transmission rod The other end of 3 is connected with one end of movable pull rod 5 by pin 4, and the other end of described movable pull rod 5 is provided with two rivet holes, through rivet one 901 and rivet two 902 respectively with the rotating block one 801 in the linkage mechanism 8 It is hinged with one end of the rotating block 2 802; the fastening nut 6 is fixed in the hole of the fixed sleeve 2, and is threadedly connected with one end of the fixed tie rod, and the fastening nut 6 and the fixed sleeve 2 are interference-connected , the fixed tie rod 7 is a hollow structure, the movable tie rod 5 passes through the middle of the fixed tie rod 7, and the other end of the fixed tie rod 7 is provided with two rivet holes. One end of rotating block 3 803 and rotating block 4 804 is hinged; the other end of rotating block 1 801 and rotating block 4 804 are respectively hinged with the groove of support plate 2 1002 through rivet 8 908 and rivet 7 907; rotating block 2 802 and the other end of the rotating block three 803 are respectively hinged with the groove of support plate one 1001 through rivet six 906 and rivet five 905, rivet five and six can slide freely in the groove of support plate one 1001, and rivet seven and eight can be The support plate 2 1002 slides freely in the groove. By turning the knob 1, the transmission rod 3 is driven to move, thereby driving the movable tie rod 5 to move, and the movement of the movable tie rod 5 drives the linkage mechanism 8 to shrink or relax, thereby driving the support plate 1 and 2 to open. or collapse.

In order to increase the friction force of the handle and make it easier to hold, the fixed sleeve 2 is provided with a handle 201 .

In order to limit the stroke of the movable pull rod 5, thereby controlling the degree of opening and closing of the support plate, the fixed sleeve 2 has a hole 202, and the pin 4 passes through the hole 202 to connect the transmission rod 3 with the movable pull rod 5, and the hole 202 can limit The stroke of movable pull rod 5 controls the degree of opening and closing of the support plate. When the pin 4 was in the limit position of the hole 202, the support plates one and two were at the maximum position that could be stretched apart. When the rivets five, six, seven, and eight were When the slots of the rotating blocks 1, 2, 3 and 4 limit their positions, the support plates 1 and 2 are in the closed position, and the fixed sleeve 2 has a positioning groove 203 for the positioning of the knob 1 .

In order to ensure that the support plate can be stretched and folded, the materials of the movable tie rod 5, the fixed tie rod 7, and the support assembly are medical titanium alloy or cobalt-chromium-molybdenum alloy material or other materials that can meet the performance requirements.

First, through full preoperative evaluation, exclude surgical contraindications, and determine the type of reducer required by the patient; After the reducer reaches the appropriate position in the vertebral body, the knob is then rotated to expand the fracture reducer and restore the height and shape of the compressed fractured vertebral body, which is specifically reflected in the following aspects:

1. Implantation through the percutaneous minimally invasive channel can achieve minimal trauma to solve the patient's illness. After the bone reducer is implanted in the vertebral body through the minimally invasive channel, it can be evenly stretched in both directions up and down, increasing the contact between the surface of the bracket and the bone. The contact surface of the tissue interface solves the problems that the existing technology cannot provide uniform expansion and the interface stress between the surface of the bracket and the bone tissue is too large;

2. The resetter adopts the principle of lever adjustment, which realizes the expansion of the support plates in two directions at the same time, and can provide uniform support force to realize the fracture reduction of the compressed vertebral body. The resetter has good controllability and can be adjusted according to actual needs. Adjustable reset height, easy to operate;

3. The reset device is made of medical titanium alloy or cobalt-chromium-molybdenum alloy material or other materials that can meet the performance.

To sum up, the fracture reducer according to the present invention is used to cleverly use the principle of leverage to realize the functions of opening support and retracting in a very small space. The present invention has a compact structure and can meet the requirements of minimally invasive medical operations. , can greatly improve work efficiency, and is suitable for popularization and application.

The scope of protection of the present invention is not limited to the technical solutions disclosed in the specific embodiments, and any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the present invention.

Claims (4)

1. a kind of minimal invasion reduction of the fracture device, it is characterised in that: include knob (1), fixes sleeve (2), drive rod (3), Selling (4), active pull rod (5), fastening nut (6), steady brace (7) and support component, the support component includes link mechanism (8), rivet (9), support plate (10), the link mechanism (8) include spill spin block one, two, three, four, and the rivet (9) includes riveting Nail one, two, three, four, five, six, seven, eight, the support plate (10) includes support plate one, two；The knob (1) covers in fixing sleeve It on cylinder (2), and is connect by screw thread with the drive rod (3) being arranged in fixes sleeve (2), the other end of drive rod (3) passes through Pin (4) connect with one end of active pull rod (5), the other end of the active pull rod (5) set there are two rivet hole, pass through rivet one (901) it is carried out respectively with one end of spill spin block one (801) and spill spin block two (802) in link mechanism (8) with rivet two (902) Hingedly；The fastening nut (6) is fixed in the hole of fixes sleeve (2), and connect with the threaded one end of steady brace, described solid Determining pull rod (7) is hollow structure, and active pull rod (5) passes through among steady brace (7), the other end of the steady brace (7) If there are two rivet hole, by rivet three (903) and rivet four (904) respectively with the spill spin block three (803) in link mechanism (8) It is carried out with one end of spill spin block four (804) hinged；The other end of spill spin block one (801) and spill spin block four (804) passes through riveting respectively The slot for following closely eight (908) and rivet seven (907) and support plate two (1002) carries out hingedly；Spill spin block two (802) and spill spin block three (803) the other end passes through rivet six (906) and rivet five (905) respectively and the slot of support plate one (1001) carries out hingedly.

2. minimal invasion reduction of the fracture device according to claim 1, it is characterised in that: the fixes sleeve (2) is equipped with Handle (201).

3. minimal invasion reduction of the fracture device according to claim 1 or 2, it is characterised in that: opened on the fixes sleeve (2) Have hole (202), pin (4) passes through hole (202) to which drive rod (3) to be connect with active pull rod (5), on the fixes sleeve (2) It is provided with locating slot (203).

4. minimal invasion reduction of the fracture device according to claim 3, it is characterised in that: the active pull rod (5), fixed drawing Bar (7), support component material be medical titanium alloy or vitallium material.