Patent Application
20110040304
1. Field of Invention
The invention relates to a positioning device for minimally invasive surgery and more particularly to a three-dimensional positioning device for minimally invasive neurosurgery.
2. Description of Related Art
In recent years, medical operation method has developed toward minimally invasive surgery. Minimally invasive surgery is characterized in small incision, such as skull tumor electro-burning surgery, nail spine implant surgery, or artificial dental implant surgery. It has several advantages such as small incision, short healing time, low probability to infect and less blood loss. Due to smaller incision, surgeon is difficult to invade and difficult to mount instrument or implant. Thus, it is necessary to have a better and precise positioning device if we want to increase the surgery success rate.
Take the skull tumor electro-burning surgery for an example, common brain diseases are inclusive of brain tumor, Parkinson's disease, epilepsy and etc. These diseases may cause the patients to have several symptoms such as tremble, headache, vomit, dysopia or unconscious. These symptoms can result in lowering the quality of life by a wide margin. Seriously, these diseases may endanger the life of patient. Furthermore, if conservative therapy can't improve the health of patient, it is necessary to utilize invasive surgery to treat these diseases.
Conventionally, surgeon has to diagnose the position of the nidus by computerized tomography (CT scan) and lots of clinical experience. Then, the surgeon utilizes a cauterizing needle and a frame to mount on the skull of patient for reaching the position of the nidus and get rid of the nidus.
Recently, computer technology has developed and advanced well. Three-dimensional image and auxiliary positioning system has developed to assist the operation of the invasive surgery. Conventional procedures of computer-assisted skull surgery are described as follows. Patient has to be mounted on a rectangular frame to execute a brain CT scan before the surgery. After the image processing in the computer, the three-dimensional relative position among the rectangular frame, the skull and the nidus is obtained. Surgeons have to plan the invasive path and depth of the cauterizing needle by utilizing the computer to calculate the rotation angle or displacement of each movable element in the mechanism when the rectangular frame mounts on the patient. Until in the surgery, surgeons utilize the rectangular frame, an optical ball device and a camera to take a picture. Surgeons also can utilize LEDs to emission signals and co-operate a receiver to obtain the position of the rectangular frame. At the same time, the position of the skull and the position of the nidus can also be obtained and then move a positioning device onto the rectangular frame mounted on the patient. Finally, as shown in
Besides, another conventional three-dimensional positioning device utilizes a rectangular frame and a semicircular frame to position. Such conventional three-dimensional positioning device in use has to cover the whole skull. It reduces the operating space for the surgeons. Furthermore, it is without the design of the cauterizing needle adjustment mechanism. It results in that surgeons have to operate the cauterizing needle manually. Therefore, the invasive depth and invasive speed can't be accurately controlled.
In addition, another conventional three-dimensional positioning device utilizes a link mechanism to make the cauterizing needle be movable or fixed. Such three-dimensional positioning device can provide a wider movable range for the cauterizing needle. However, it also leads to a problem of cumbersome volume. It reduces the operating space for the surgeons. It also leads to a poor rigidity due to the link mechanism.
Besides, another conventional three-dimensional positioning device utilizes an upper member and a lower member to rotate. The upper member is semicircular. The upper member can provide a curve movement. Such conventional three-dimensional positioning device is small and can be directly mounted on the incision of the skull. It utilizes a rotatable knob to adjust the cauterizing needle into the nidus with a small extent. However, due to the small volume, it leads to a smaller scale. Smaller scale may lead to difficult adjustment in practical operation. At the same time, such conventional three-dimensional positioning device has many parts. It is time-consuming to assemble the conventional three-dimensional positioning device.
To summarize, conventional three-dimensional positioning device first have many problems such as low precision, poor rigidity and so on. Furthermore, as shown in
It is therefore one object of the invention to provide a three-dimensional positioning device for minimally invasive surgery comprising: a base, two angle adjustable assemblies, an arc, a sliding assembly, a first positioning assembly, a second positioning assembly and a third positioning assembly. The base includes two first frames and two second frames. Two ends of each second frame connected to the first frames respectively. Each first frame has a pivotal member. The angle adjustable assemblies are pivotably connected to the pivotal member of the first frame respectively.
The arc includes a hollow track member. The angle adjustable assemblies are connected to two ends of the arc. The sliding assembly is mounted on the track member of the arc according to a predetermined position of a nidus. The first positioning assembly is mounted on the second frame according to the predetermined position of the nidus. The second positioning assembly is mounted on the first positioning assembly. The third positioning assembly is mounted on the second positioning assembly.
In a first aspect of the invention the first frames are parallel with each other.
In a second aspect of the invention the second frames are parallel with each other.
In a third aspect of the invention the first frame is perpendicular to the second frame.
In a fourth aspect of the invention each pivotal member further comprises a scale.
In a fifth aspect of the invention the arc further comprises two indicators disposed on the ends of the arc and being adjacent to and above the angle adjustable assemblies.
In a sixth aspect of the invention the sliding assembly further comprises a positioning member, a clamping member, a connecting member and a clamping plate; the clamping member is threadedly connected to the connecting member through the clamping plate and the hollow track member, wherein the clamping member clamps the clamping plate and the hollow track member to be fixedly mounted on the arc.
In a seventh aspect of the invention the third positioning assembly further comprises a cauterizing needle and a threaded transmission shaft connected to the cauterizing needle; wherein the threaded transmission shaft drives the cauterizing needle to move.
In an eighth aspect of the invention the first positioning assembly further comprises a fixed member having a first groove, a first threaded shaft, a first transmission member having a second groove, a second threaded shaft and a second transmission shaft; the fixed member is adjustably mounted on the second frames, wherein the first threaded shaft drives the first transmission member to move, the second threaded shaft drives the second transmission member to move.
In a ninth aspect of the invention the second positioning assembly further comprises an adjustment base having a curve member, a sliding member, a sliding base, two first clamping components and two second clamping components; the first clamping components are mounted through the sliding base, wherein the first clamping components push the second clamping components to press the sliding member and the curve member, wherein the sliding base is mounted fixedly on the curve member.
In a tenth aspect of the invention each angle adjustable assembly comprises a rotatable member having two pressing parts, a cover having two cover grooves, two springs, two clipping members and two pressing members; the rotatable member is mounted on the arc, wherein the cover contains the rotatable member, the springs, the clipping members and the pressing members, each spring is mounted between the pressing part and the clipping member, each pressing member is respectively mounted on each clipping member, each pressing member is disposed and limited in each cover groove, wherein pressing the pressing members to rotate and position the arc.
By utilizing the invention, the following advantages are obtained. First, the present invention provides a three-dimensional positioning device for minimally invasive surgery. The present invention can effectively improve the precision and operate more precisely in the minimally invasive surgery to increase the surgery success rate. Second, the present invention provides less moving directions for adjusting. Therefore, the calculating of the positioning parameters is simpler and more convenient. The present invention is easy to operate, simple mechanism, easy to manufacture, small and light. Thus, the present invention combines with many advantages compared to the conventional positioning device.
The invention will become more obvious from the following description when taken in connection with the accompanying drawings.
Referring to
The arc 30 includes a hollow track member 31. The angle adjustable assemblies 20 are connected to two ends of the arc 30. The sliding assembly 40 is mounted on the track member 31 of the arc 30 according to a predetermined position of a nidus. The first positioning assembly 50 is mounted on the second frame 12 according to the predetermined position of the nidus. The second positioning assembly 60 is mounted on the first positioning assembly 50. The third positioning assembly 70 is mounted on the second positioning assembly 60.
Preferably, the first frames 11 are parallel with each other.
Preferably, the second frames 12 are parallel with each other.
Preferably, the first frame 11 is perpendicular to the second frame 12.
Preferably, each pivotal member 111 further comprises a scale.
Preferably, the arc 30 further comprises two indicators 32 disposed on the ends of the arc 30 and being adjacent to and above the angle adjustable assemblies 20.
Preferably, the sliding assembly 40 further comprises a positioning member 41, a clamping member 42, a connecting member 43 and a clamping plate 44; the clamping member 42 is threadedly connected to the connecting member 43 through the clamping plate 44 and the hollow track member 31, wherein the clamping member 42 clamps the clamping plate 44 and the hollow track member 31 to be fixedly mounted on the arc 30.
Preferably, the third positioning assembly 70 further comprises a cauterizing needle 71 and a threaded transmission shaft 72 connected to the cauterizing needle 71; wherein the threaded transmission shaft 72 can drive the cauterizing needle 71 to move.
Preferably, the first positioning assembly 50 further comprises a fixed member 51 having a first groove 511, a first threaded shaft 52, a first transmission member 53 having a second groove 531, a second threaded shaft 54 and a second transmission shaft 55; the fixed member 51 is adjustably mounted on the second frames 12, wherein the first threaded shaft 52 can drive the first transmission member 53 to move, the second threaded shaft 54 can drive the second transmission member 55 to move.
Preferably, the second positioning assembly 60 further comprises an adjustment base 61 having a curve member 611, a sliding member 62, a sliding base 63, two first clamping components 65 and two second clamping components 64; the first clamping components 65 are mounted through the sliding base 63, wherein the first clamping components 65 push the second clamping components 64 to press the sliding member 62 and the curve member 611, wherein the sliding base 63 is mounted fixedly on the curve member 611.
Preferably, each angle adjustable assembly 20 comprises a rotatable member 21 having two pressing parts 211, a cover 22 having two cover grooves 221, two springs 23, two clipping members 24 and two pressing members 25; the rotatable member 21 is mounted on the arc 20, wherein the cover 22 contains the rotatable member 21, the springs 23, the clipping members 24 and the pressing members 25, each spring 23 is mounted between the pressing part 211 and the clipping member 24, each pressing member 25 is respectively mounted on each clipping member 24, each pressing member 25 is disposed and limited in each cover groove 221, wherein pressing the pressing members 25 to rotate and position the arc 30.
Referring to
The present invention in use is a mechanism as shown in
Moreover, referring to
By utilizing the invention, the following advantages are obtained. First, the present invention provides a three-dimensional positioning device for minimally invasive surgery. The present invention can effectively improve the precision and operate more precisely in the minimally invasive surgery to increase the surgery success rate. Second, the present invention provides less moving directions for adjusting. Therefore, the calculating of the positioning parameters is simpler and more convenient. The present invention is easy to operate, simple mechanism, easy to manufacture, small and light. Thus, the present invention combines with many advantages compared to the conventional positioning device.
While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.
