CN113017551A

CN113017551A - Backbone endoscope work sleeve pipe

Info

Publication number: CN113017551A
Application number: CN202110137868.6A
Authority: CN
Inventors: 黎庆初; 刘则征; 程亮; 赵庆豪; 江剑; 朱炜嘉; 陈俊杰
Original assignee: Third Affiliated Hospital Of Southern Medical University (academy Of Orthopaedics Guangdong Province)
Current assignee: Third Affiliated Hospital Of Southern Medical University (academy Of Orthopaedics Guangdong Province)
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-06-25

Abstract

A working sleeve of a spinal endoscope comprises a movable part, a sleeve main body and an operating handle. One end of the movable part is fixedly assembled at the front end of the sleeve main body, and the operating handle is fixedly assembled at the rear end of the sleeve main body. The movable part comprises a plurality of drum-shaped pipe joints, and two ends of each drum-shaped pipe joint are respectively provided with a clamping head end or a clamping groove end. The clamping head end is provided with a horn-shaped clamping head, the clamping groove end is provided with a circular clamping groove, the clamping head and the clamping groove are matched and movably clamped with each other, and the clamping groove end is the tail end of the movable part. The front end movable part of the spinal endoscope working sleeve can be bent in a reciprocating way on the same horizontal plane, so that the path of the endoscope working channel is changed, more operation visual fields are obtained, and the effect of observing a plurality of focuses from a single wound is realized. The movable part of the spinal endoscope working sleeve has the function of tightness, and a rigid nonlinear endoscope working channel can be formed according to the requirements of an operator.

Description

Backbone endoscope work sleeve pipe

Technical Field

The invention relates to the technical field of spinal endoscopes, in particular to a working sleeve of a spinal endoscope.

Background

The spinal minimally invasive surgery has less traction and stripping to soft tissues, so that the postoperative pain can be reduced, and the recovery time can be shortened. With the development of microendoscopy technology and the clinical use of special surgical instruments and devices, surgeons have been able to perform past surgical procedures through one or more tiny incisions. Like open surgery, minimally invasive spine surgery can also achieve nerve decompression, spine stabilization and fusion, and correction of spinal deformity under minimally invasive conditions. Spinal minimally invasive surgery requires a rigid endoscope such as an intervertebral disc endoscope as a main surgical tool. A rigid endoscope is an endoscope in which the portion of the body into which the endoscope enters cannot follow natural orifices or surgical incisions or other instrument channels created. It enters the body mainly by an invasive means rather than by the natural pores of the body.

When the existing intervertebral disc endoscope is used for operation, the visual field of the endoscope is limited due to a single operation wound, and the operation of an operator is difficult. Meanwhile, if a more visual good visual field in the human body is to be obtained, a plurality of wounds need to be established for observation, so that the wound of a patient is increased, postoperative recovery of the patient is not facilitated, the complexity of the operation is increased, and the operation risk is increased. Therefore, in order to overcome the defects of the prior art, the invention provides a working sleeve of a spinal endoscope.

Disclosure of Invention

The invention aims to avoid the defects of the prior art and provides a working sleeve of a spinal endoscope. The front end movable part of the spinal endoscope working sleeve can be bent in a reciprocating way on the same horizontal plane, so that the path of the endoscope working channel is changed, more operation visual fields are obtained, and the effect of observing a plurality of focuses from a single wound is realized. The movable part of the spinal endoscope working sleeve has the function of tightness, and a rigid nonlinear endoscope working channel can be formed according to the requirements of an operator.

The above object of the present invention is achieved by the following technical measures.

The invention provides a spinal endoscope working sleeve, which comprises a movable part, a sleeve main body and an operating handle, wherein the movable part is arranged on the sleeve main body;

one end of the movable part is fixedly assembled at the front end of the sleeve main body, and the operating handle is fixedly assembled at the rear end of the sleeve main body;

the movable part comprises a plurality of drum-shaped pipe joints, and two ends of each drum-shaped pipe joint are respectively provided with a clamping head end or a clamping groove end;

the clamping head end is provided with a horn-shaped clamping head, the clamping groove end is provided with a circular clamping groove, the clamping head and the clamping groove are matched with each other and movably clamped, and the clamping groove end is the tail end of the movable portion.

Preferably, the drum-shaped pipe joint is provided with a clamping head and a clamping groove;

the clamping head of one drum-shaped pipe joint is movably clamped with the clamping groove of the other drum-shaped pipe joint in sequence.

Preferably, the drum-shaped pipe joint comprises a double-end pipe joint and a double-groove pipe joint, the double-end pipe joint is provided with two clamping heads, and the double-groove pipe joint is provided with two clamping grooves;

the double-end pipe joint and the double-groove pipe joint are movably clamped at intervals in sequence.

Furthermore, the clamping head is arranged at the outer edge of the opening of the drum-shaped pipe joint, one end of the clamping head integrally connected with the drum-shaped pipe joint is a small-opening end, and the other end of the clamping head is a large-opening end; the large opening end is provided with a plurality of longitudinal hollow grooves, and the edge of the outer wall of the large opening end is provided with a clamping hook;

the clamping groove is arranged on the inner edge of the opening of the drum-shaped pipe joint;

the caliber M of the large opening end is larger than the caliber L of the opening where the clamping groove is located, the caliber N of the small opening end is smaller than the caliber D of the opening where the clamping groove is located, and M is larger than D and larger than N.

Furthermore, two pairs of limiting holes which are distributed oppositely at 180 degrees are formed in the drum body of the drum-shaped pipe joint, and the connecting line of each pair of limiting holes is parallel to the pipe shaft.

In one implementation mode of the invention, the operating handle is also provided with a cable control device which comprises an adjusting knob, a winding shaft and a traction steel wire;

one end of the winding shaft is movably arranged on the operating handle, the other end of the winding shaft is fixedly connected with the adjusting knob, and two ends of the traction steel wire are respectively and fixedly connected with the winding shaft and one side of one of the drum-shaped pipe joints;

the adjusting knob drives the winding shaft to rotate relative to the operating handle.

Further, the cable control device is provided with four groups; two groups of the cable control devices are fixedly connected with two sides of the drum-shaped pipe joint at the tail end of the movable part, and the other two groups of the cable control devices are fixedly connected with two sides of the drum-shaped pipe joint at the midpoint of the movable part.

Furthermore, the traction steel wire sequentially penetrates through a pair of limiting holes on the same side of the drum-shaped pipe joint.

Further, the movable part and the sleeve main body are both made of stainless steel materials.

In another implementation of the invention, the material of the distal end of the movable section and any drum-shaped tube segments equally dividing the movable section is magnetic stainless steel, and the material of the other drum-shaped tube segments of the movable section is non-magnetic stainless steel.

The invention has the beneficial effects that:

(1) the front end of the working sleeve of the spinal endoscope is provided with a movable part which can be bent to and fro, so that the path of a working channel of the endoscope is changed, more operation visual fields are obtained, and the effect of observing a plurality of focuses from a single wound is realized. In practice, the operator can observe bilateral conditions of multiple segments of the spinal column through unilateral puncture. The spinal endoscope working sleeve has only one operation access, can reduce the number of wounds of patients and is beneficial to postoperative recovery of the patients.

(2) The movable part at the front end of the working sleeve of the spinal endoscope is provided with a plurality of movably clamped drum-shaped pipe joints. The two ends of the drum-shaped pipe joint are provided with clamping heads or clamping grooves. The dop is loudspeaker shape, and its osculum end and tube coupling opening body coupling, and its macrostoma end has fretwork groove and the trip of turning up, cuts apart into a plurality of claw pieces that have certain resilience with the macrostoma end. Therefore, when the large opening end of the chuck is subjected to the force from outside to inside, the space provided by the hollow groove can be utilized to contract inwards along the radial direction; when the big mouth end of the chuck loses stress, the original state can be recovered. Meanwhile, due to the design of the hollow groove, the large opening end of the chuck can be locally contracted. When the axes of the two drum-shaped pipe joints are on the same straight line, the clamping head slides to the limit position where the clamping hook is embedded into the clamping groove, and the whole large opening end of the clamping head is extruded and contracted in the radial direction. When the axes of the two drum-shaped pipe joints are not on the same straight line, namely the movable part is bent, the clamping head on one side in the bending direction keeps the original shape, the clamping hook on the side is farthest away from the clamping groove, the clamping head on the other side in the bending direction contracts inwards, and the clamping head slides locally to the limit position where the clamping hook is embedded into the clamping groove. The dop with fretwork groove can the atress adduction, and the lost force recovers, can guarantee after the dop gets into the draw-in groove, firm joint does not loosen, can guarantee again that drum type pipe section has crooked space, has realized the reliable connectivity and the bendability of movable part.

(3) The large opening end of the chuck is divided into a plurality of claw sheets with certain resilience by the hollow groove, so that the large opening end of the chuck can be integrally outwards unfolded along the radial direction after being subjected to force from inside to outside; when the big mouth end of the chuck loses stress, the original state can be recovered. Meanwhile, due to the design of the hollow groove, the large opening end of the chuck can be partially outwards supported. When the movable part is in a bending state, the claw sheet on one side of the bending direction is suspended in the drum-shaped pipe joint. When the endoscope passes through the working pipeline, the endoscope can open the claw sheet suspended at the big opening end of the chuck outwards along the radial direction. When the endoscope exits the working channel, the clamping head of the external support can be restored to the original state. The dop with fretwork groove can atress external stay, and the power of losing recovers, can guarantee that the pipe diameter in the movable part does not diminish because of the bending, realizes passing through smoothly of endoscope.

(4) The rear end of the working sleeve of the spinal endoscope is provided with an operating handle, and the movable part is controlled by the tightness of the cable. Particularly, the drum-shaped pipe joints at the tail ends of the movable parts and the drum-shaped pipe joints of the equally-divided movable parts change the trend under the tension of the traction steel wire. The position of the movable part can be fixed by fixing the traction steel wire. The movable part and the sleeve main body are made of stainless steel materials, and the movable part and the sleeve main body jointly form a rigid nonlinear working sleeve, so that good support protection is provided for the endoscope. In another embodiment, the drum-shaped pipe joints at the tail end of the movable part and the drum-shaped pipe joints equally dividing the movable part are made of magnetic stainless steel, and the moving direction and the fixing of the movable part can be controlled by external magnetic field navigation.

In conclusion, the front end movable part of the working sleeve of the spinal endoscope can be bent in a reciprocating way on the same horizontal plane, so that the path of the working channel of the endoscope is changed, more operation visual fields are obtained, and the effect of observing a plurality of focuses from a single wound is realized. The movable part of the spinal endoscope working sleeve has the function of tightness, and a rigid nonlinear endoscope working channel can be formed according to the requirements of an operator. The spine endoscope working sleeve can assist a soft endoscope in use, overcomes the problems of single surgical access and insufficient visual field in the use of the existing hard endoscope and working sleeve, and provides a new idea for the minimally invasive endoscope technology.

Drawings

The invention is further illustrated by means of the attached drawings, the content of which is not in any way limiting.

FIG. 1 is a schematic structural view of a working sleeve of a spinal endoscope according to embodiment 1 of the present invention.

Fig. 2 is a schematic longitudinal sectional view of a single banjo joint of embodiment 1 of the present invention.

Fig. 3 is a schematic diagram showing a longitudinal sectional structure of a plurality of drum joints in a natural state (3a), an extreme state (3b), and a bent state (3c) in accordance with embodiment 1 of the present invention.

Fig. 4 is a schematic configuration diagram of a cable control device according to embodiment 1 of the present invention.

Fig. 5 is a schematic diagram showing the structure of a single double-ended pipe section (5a) and a single double-grooved pipe section (5b) of embodiment 2 of the present invention in longitudinal section and after clamping (5 c).

Fig. 6 is a schematic view of an application scenario of a working cannula of a spinal endoscope in embodiment 4 of the invention.

In fig. 1 to 6, the apparatus includes:

the movable part 1, the drum-shaped pipe joint 11, the clamping head 111, the clamping groove 112, the hollow groove 1111, the clamping hook 1112, the limiting hole 113, the sleeve main body 2, the operating handle 3, the adjusting knob 31, the winding shaft 32 and the traction steel wire 33.

Detailed Description

The invention is further illustrated by the following examples.

Example 1.

A working sleeve of a spinal endoscope is shown in fig. 1 and comprises a movable part 1, a sleeve main body 2 and an operation handle 3. One end of the movable part 1 is fixedly assembled at the front end of the sleeve main body 2, and the operating handle 3 is fixedly assembled at the rear end of the sleeve main body 2. The movable part 1 comprises a plurality of drum-shaped pipe joints 11, and two ends of each drum-shaped pipe joint 11 are respectively provided with a clamping head end or a clamping groove end. The clamping head end is provided with a horn-shaped clamping head 111, the clamping groove end is provided with a circular clamping groove 112, the clamping head 111 and the clamping groove 112 are matched and movably clamped with each other, and the clamping groove 112 end is the tail end of the movable part 1. The backbone endoscope working sleeve is used for backbone endoscope minimally invasive surgery, and can establish a rigid nonlinear working channel for a soft endoscope. The front end movable part 1 of the spinal endoscope working sleeve can be bent to and fro, thereby changing the trend of the working channel. In order to increase the rigidity of the present invention and provide a good support for the flexible endoscope, the movable section 1 and the sleeve main body 2 are both made of stainless steel material.

As shown in fig. 2, the banjo 11 is provided with a clamp 111 and a slot 112. The clamping head 111 is arranged at the outer edge of the opening of the drum-shaped pipe joint, one end of the clamping head 111 integrally connected with the drum-shaped pipe joint 11 is a small-mouth end, and the other end of the clamping head 111 is a large-mouth end; the large opening end is provided with a plurality of longitudinal hollow grooves 1111, and the edge of the outer wall of the large opening end is provided with a clamping hook 1112. The catch 112 is located at the open inner edge of the banjo 11. The caliber M of the large opening end is larger than the caliber L of the opening of the clamping groove 112, the caliber N of the small opening end is smaller than the caliber D of the opening of the clamping groove 112, and M is larger than D and larger than N.

As shown in fig. 3 (a partial view of a plurality of pipe joints), each of the drum pipe joints 11 has a structure having a chuck 111 and a chuck groove 112. The clamping head 111 of the drum-shaped pipe joint 11 is movably clamped with the clamping groove 112 of the other drum-shaped pipe joint 11 in sequence. The connection principle of the invention is as follows: the chuck 111 is in a horn shape, the small opening end of the chuck is integrally connected with the opening of the pipe joint, the large opening end of the chuck is provided with a hollow groove 1111 and an outward turned clamping hook 1112, and the large opening end is divided into a plurality of claw pieces with certain resilience. Therefore, when the large opening end of the chuck 111 is subjected to an outside-in force, the space provided by the hollow-out groove 1111 can be utilized to contract inwards along the radial direction; when the large opening end of the chuck 111 loses stress, the original state can be recovered. Meanwhile, due to the design of the hollow-out groove 1111, the large opening end of the chuck 111 can be partially contracted. When the axes of the two drum-shaped pipe joints are on the same straight line, the chuck 111 slides to the limit position where the hook 1112 is embedded into the slot 112, and the whole large opening end of the chuck 111 is radially extruded and contracted. When the axes of the two drum-shaped pipe joints are not on the same straight line, that is, the movable part 1 is in a bending state, the clamp 111 on one side in the bending direction is kept in an original state, the hook 1112 on the side is farthest away from the slot 112, the clamp 111 on the other side in the bending direction is retracted inwards, and the clamp 111 partially slides to the limit position where the hook 1112 is embedded into the slot 112. The clamping head 111 with the hollow groove 1111 can be stressed to be retracted and restored by losing force, so that after the clamping head 111 enters the clamping groove 112, firm clamping and no loosening can be guaranteed, a bending space can be guaranteed between the drum-shaped pipe sections, and reliable connectivity and flexibility of the movable part 1 are achieved. Since the drum body of the drum joint 11 has a spherical shape, the change in the pipe axial direction between the two drum joints 11 is universal, and there are many possibilities of controlling the bending direction of the movable portion 1. The present invention is able to bend the banjo 11 in all directions in the manner described above. And will not be described in detail herein. It should be noted that, the bending angles of two adjacent drum-shaped pipe joints 11 with different requirements may be designed by those skilled in the art according to the requirements, such as the length of the chuck 111, the caliber M of the large-opening end, the caliber N of the small-opening end, the caliber D of the opening where the slot 112 is located, and the height and width of the drum body of the drum-shaped pipe joint 11, which is not further limited herein.

Because the hollow-out groove 1111 divides the large opening end of the chuck 111 into a plurality of claw sheets with certain resilience, when the large opening end of the chuck 111 is forced from inside to outside, the whole body is expanded outwards along the radial direction; when the large opening end of the chuck 111 loses stress, the original state can be recovered. Meanwhile, due to the design of the hollow-out groove 1111, the large opening end of the chuck 111 can be partially outwards supported. When the movable part 1 is in a bending state, the claw piece on one side of the bending direction is suspended in the drum-shaped pipe joint. When the endoscope passes through the working pipeline, the endoscope can open the claw sheet which is suspended at the large opening end of the chuck 111 outwards along the radial direction. When the endoscope exits the working channel, the external-supporting chuck 111 can be restored to the original state. The clamping head 111 with the hollow groove 1111 can be stressed to be externally supported, force loss recovery can be realized, the pipe diameter in the movable part 1 can be ensured not to be reduced due to bending, and smooth passing of the endoscope can be realized.

As shown in fig. 1, the drum body of the drum-shaped pipe joint 11 is provided with two pairs of limiting holes 113 distributed oppositely at 180 degrees, and the connecting line of each pair of limiting holes 113 is parallel to the pipe shaft. The operating handle 3 of the present embodiment is further provided with a cable control device including an adjusting knob 31, a spool 32 and a pull wire 33. One end of the winding shaft 32 is movably mounted on the operating handle 3, the other end of the winding shaft 32 is fixedly connected with the adjusting knob 31, and two ends of the traction steel wire 33 are fixedly connected with the winding shaft 32 and one side of one of the drum-shaped pipe joints 11 respectively. The adjusting knob 31 rotates the spool 32 relative to the operating handle 3. The traction wire 33 passes through a pair of limiting holes 113 on the same side of the drum-shaped pipe joint 11 in sequence.

As shown in FIG. 4, the cable control device of the present embodiment is provided with four sets of E-E, F-F, G-G, and H-H; wherein, two groups of cable control devices of E-E and F-F are fixedly connected with two sides of the drum-shaped pipe section at the tail end of the movable part 1, and the other two groups of cable control devices of G-G and H-H are fixedly connected with two sides of the drum-shaped pipe section at the midpoint of the movable part 1. The two groups of cables E-E and F-F do not pass through the drum-shaped pipe joint controlled by the two groups of cables G-G and H-H. When the traction steel wire 33 on one side is tightened, the drum-shaped pipe joint connected with the traction steel wire turns to the stressed side, and the movable part 1 is bent according to a preset route. When the movable part 1 is bent according to a preset route, the adjusting knob 31 is locked, the movable part 1 is fixed, and at the moment, the movable part 1 and the sleeve main body 2 jointly form a rigid nonlinear working sleeve, so that good support protection is provided for the endoscope. Meanwhile, the steering operation of the endoscope is facilitated, and the endoscope is helped to obtain more visual fields. During production, the endoscope can be controlled by adding a cable control device and a limiting hole 113 according to actual needs, so that more-dimensional and more-accurate endoscope routes can be obtained. When the flexible endoscope is used, the working sleeve is kept flush with the tail end of the flexible endoscope, the light source of the flexible endoscope is used for lighting the inside of a human body, and the position and the direction of the movable part 1 are adjusted by the cable control device under the visible condition. The position of the working sleeve can be known only by means of X-ray radiography and the like, and radiation harm to an operator and a patient is reduced.

The front end movable part 1 of the spinal endoscope working sleeve can be bent in a reciprocating way on the same horizontal plane, the path of the endoscope working channel is changed, more operation visual fields are obtained, and the effect that a plurality of focuses can be observed from a single wound is realized. The movable part 1 of the spinal endoscope working sleeve has the function of tightness, and can form a rigid nonlinear endoscope working channel according to the requirements of an operator. The spine endoscope working sleeve can assist a soft endoscope in use, overcomes the problems of single surgical access and insufficient visual field in the use of the existing hard endoscope and working sleeve, and provides a new idea for the minimally invasive endoscope technology.

Example 2.

A working sleeve of a spinal endoscope has the same other structure as that of embodiment 1, except that, as shown in FIG. 5, a drum-shaped pipe joint 11 includes a double-headed pipe joint provided with two chucks 111 and a double-grooved pipe joint provided with two engaging grooves 112. The double-end pipe joint and the double-groove pipe joint are movably clamped at intervals in sequence.

The front end movable part 1 of the spinal endoscope working sleeve can be bent in a reciprocating way on the same horizontal plane, the path of the endoscope working channel is changed, more operation visual fields are obtained, and the effect that a plurality of focuses can be observed from a single wound is realized. The movable part 1 of the spinal endoscope working sleeve has the function of tightness, and can form a rigid nonlinear endoscope working channel according to the requirements of an operator.

Example 3.

A working sleeve of a spinal endoscope has the same other structure as that of embodiment 1 or 2, except that the material of the tail end of the movable part 1 and the drum-shaped pipe joint which is arbitrarily divided into equal parts of the movable part 1 is magnetic stainless steel, and the material of the other drum-shaped pipe joints 11 of the movable part 1 is non-magnetic stainless steel. When the flexible endoscope is used, the working sleeve is kept flush with the tail end of the flexible endoscope, the light source of the flexible endoscope is used for lighting the inside of a human body, and the moving part 1 is controlled to move and be fixed by external magnetic field navigation under the visible condition. The position of the working sleeve can be known only by means of X-ray radiography and the like, and radiation harm to an operator and a patient is reduced.

The front end movable part 1 of the spinal endoscope working sleeve can be bent in a reciprocating way on the same horizontal plane, the path of the endoscope working channel is changed, more operation visual fields are obtained, and the effect that a plurality of focuses can be observed from a single wound is realized. The spinal endoscope working sleeve can form a rigid nonlinear endoscope working channel according to the requirements of operators. The spine endoscope working sleeve can assist a soft endoscope in use, overcomes the problems of single surgical access and insufficient visual field in the use of the existing hard endoscope and working sleeve, and provides a new idea for the minimally invasive endoscope technology.

Example 4.

A working cannula of a spinal endoscope having the same embodiment as 1 or 2 or 3, which is applied to a spinal minimally invasive surgery scene is shown in fig. 6. The working sleeve of the spinal endoscope is bent in a reciprocating manner in the safe triangular area of the spinal column by controlling the movable part 1, and can be moved to the positions of the spinal nerves from (i) to (ii) at the upper, middle and lower sections near the spinal wound under the condition of only one wound, so that a good supporting environment is created for the flexible endoscope.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A spinal endoscope working sleeve is characterized by comprising a movable part, a sleeve main body and an operating handle;

2. The spinal endoscope working sleeve of claim 1, wherein said crown tube segment is provided with a clamp head and a slot;

3. The spinal endoscope working cannula of claim 1, wherein the drum-shaped tube section comprises a double-ended tube section and a double-grooved tube section, the double-ended tube section is provided with two clamps, and the double-grooved tube section is provided with two clamping grooves;

4. The spinal endoscope working sleeve according to claim 2 or 3, characterized in that the clamp is arranged at the outer edge of the opening of the drum-shaped pipe joint, one end of the clamp integrally connected with the drum-shaped pipe joint is a small-mouth end, and the other end of the clamp is a large-mouth end; the large opening end is provided with a plurality of longitudinal hollow grooves, and the edge of the outer wall of the large opening end is provided with a clamping hook;

5. The working sleeve of the spinal endoscope as claimed in claim 4, wherein the drum body of the drum-shaped tube joint is provided with two pairs of limiting holes which are oppositely distributed in 180 degrees, and the connecting line of each pair of limiting holes is parallel to the tube shaft.

6. The spinal endoscope working sleeve according to claim 5, characterized in that said operating handle is further provided with cable control means comprising an adjusting knob, a spool and a traction wire;

7. The spinal endoscope working sleeve of claim 6, wherein said cable control device is provided in four groups; two groups of the cable control devices are fixedly connected with two sides of the drum-shaped pipe joint at the tail end of the movable part, and the other two groups of the cable control devices are fixedly connected with two sides of the drum-shaped pipe joint at the midpoint of the movable part.

8. The spinal endoscope working sleeve of claim 7, wherein said pull wire is sequentially threaded through a pair of stop holes on the same side of said drum-shaped joint.

9. The spinal endoscope working cannula of claim 1, wherein the active portion and the cannula body are both stainless steel material.

10. The spinal endoscope working cannula of claim 5, characterized in that the material of the distal end of the active portion and any drum-shaped tube segments equally dividing the active portion is magnetic stainless steel and the material of the other drum-shaped tube segments of the active portion is non-magnetic stainless steel.