CN108652795B

CN108652795B - Surgical instrument for treating prostatic hyperplasia

Info

Publication number: CN108652795B
Application number: CN201710204359.4A
Authority: CN
Inventors: 夏术阶
Original assignee: Buddy Maitong Medical Technology Suzhou Co ltd
Current assignee: Buddy Maitong Medical Technology Suzhou Co ltd
Priority date: 2017-03-30
Filing date: 2017-03-30
Publication date: 2023-11-17
Anticipated expiration: 2037-03-30
Also published as: CN108652795A

Abstract

A surgical instrument for treating prostatic hyperplasia, comprising: the memory alloy bracket comprises a plurality of cutting parts distributed along the first circumferential direction; the protection tube, the one end of protection tube has the entry and the other end is as the tip of inserting, the tip of inserting is formed with a plurality of through-holes. The protective tube is placed into the urethra and the through hole is brought to correspond to the position of prostatic hypertrophy, and then the memory alloy stent in the contracted state is inserted into the protective tube and the cut portion is aligned with the fitted through hole. Under the heating of body temperature, the cutting part expands to the expansion state of restoring outside the matched through hole. During the expansion, the incision portion cuts the urethral wall, compressing the enlarged prostate. The memory alloy stent is left for a period of time, and the cutting part presses the enlarged prostate to enable the prostate to be unable to supply blood for a long time and shrink to a normal size, so that the disease source of the prostatic hyperplasia is fundamentally removed. In addition, in the retaining process, the through holes form limit positions for the cutting parts, so that the memory alloy bracket is prevented from shifting.

Description

Surgical instrument for treating prostatic hyperplasia

Technical Field

The invention relates to the technical field of medical appliances, in particular to a surgical appliance for treating prostatic hyperplasia.

Background

The prostatic hyperplasia is a urinary disease which is more frequently suffered by the elderly, and the trend of the prostatic hyperplasia is greatly younger along with the change of the life style of people. The prostate is a special organ of a male, and the disease hypertrophy can squeeze the urethra of the male, so that urination is difficult and even more serious diseases such as urinary stones are caused.

At present, a common method for clinically solving the diseases is to install a prostate bracket at a position of prostatic hyperplasia in the urethra, dredge the urethra through the expansion effect of the prostate bracket, and solve the problem of difficult urination. However, two problems are often encountered with this approach: firstly, the problem of secondary stent placement caused by the disease source can not be fundamentally solved; secondly, the prostate stent has a displacement problem, which causes difficult extraction.

Disclosure of Invention

The invention solves the problems that the prior method for treating the prostatic hyperplasia by utilizing the prostatic stent has two problems: firstly, the problem of secondary stent placement caused by the disease source can not be fundamentally solved; secondly, the prostate stent has a displacement problem, which causes difficult extraction.

In order to solve the problems, the invention provides a surgical instrument for treating prostatic hyperplasia. Wherein the surgical instrument comprises:

a memory alloy stent comprising a plurality of cut portions distributed along a first circumferential direction, the cut portions being adapted to expand outwardly from a contracted state to an expanded state at body temperature;

The protection tube is provided with an inlet at one end and an insertion end at the other end, wherein the insertion end is provided with a plurality of through holes distributed along the second circumferential direction of the protection tube, and the protection tube is used for being inserted into the urethra;

the protection tube and the memory alloy bracket are adapted to: the cutting part is adapted to the through hole;

in the contracted state, the memory alloy stent is placed into the protective tube from the inlet, and the cutting part is aligned with the adapted through hole along the radial direction of the protective tube;

in the expanded state, the cutting portion expands outwardly of the adapted through hole.

Compared with the prior art, the technical scheme of the invention has the following advantages:

the memory alloy stent comprises a cutting part and a protective tube is provided with a through hole, the protective tube is placed into the urethra and the through hole corresponds to the position of prostatic hyperplasia, and then the memory alloy stent in a contracted state is inserted into the protective tube and the cutting part is aligned with the matched through hole. Under the heating of body temperature, the cutting part expands to the expansion state of restoring outside the matched through hole. During the expansion, the incision portion cuts the urethral wall, compressing the enlarged prostate. The memory alloy stent is left for a period of time, and the cutting part presses the enlarged prostate to enable the prostate to be unable to supply blood for a long time and shrink to a normal size, so that the disease source of the prostatic hyperplasia is fundamentally removed. In addition, in the retaining process, the through holes form limit positions for the cutting parts, so that the memory alloy bracket is prevented from shifting.

Optionally, the memory alloy bracket further comprises two end rings, and two ends of each of the cutting parts are fixedly connected with the two end rings respectively;

a first supporting piece and a second supporting piece are arranged in the insertion end part, and the first supporting piece, the second supporting piece and the through holes are sequentially distributed in the direction from the insertion end part to the inlet;

the protection tube and the memory alloy bracket are adapted to: one of the two end rings, which is remote from the inlet, passes between the second support and the protective tube and is defined between the first support and the second support.

Optionally, the second support has a plurality of indentations distributed along the first circumference;

the through holes extend to the corresponding gaps from one side of the second support piece, which is close to the inlet, and are cut off between the first support piece and the second support piece.

Optionally, a surface of the second support facing the protection pipe is a slope, the slope being inclined toward a radially inner side of the protection pipe in a direction from the second support to the first support.

Optionally, a surface of the first support facing the protection pipe is a slope, and the slope is inclined toward a radially inner side of the protection pipe in a direction from the first support to the second support.

Optionally, the first support and the second support are annular extending along the first circumference.

Optionally, the surgical instrument further comprises a conveyor, the conveyor comprising a main body and a plurality of support portions;

the main body is provided with a feeding end part and an operating end part which are positioned on an axis, and all the supporting parts are arranged on the feeding end part and distributed around the axis;

the support part comprises a fixed end and a free end, the fixed end is fixed on the main body, and the free end is far away from the axis and the operation end part than the fixed end;

the support part has a first position and a second position, in which the free end is located outside the main body, and the distance from the free end to the main body in the first position is smaller than the distance from the free end to the main body in the second position;

the conveyor, the memory alloy support and the protective tube are adapted to: in the first position, the memory alloy stent is supported between all of the support portions, the main body delivering the memory alloy stent to the insertion end portion;

in the second position, the main body moves outside the protective tube to disengage the memory alloy bracket from the support portion from the free end side.

Optionally, the supporting portion is bent toward the feeding end portion after extending from the fixed end to the main body and extends to the free end.

Optionally, the supporting portion extends from the fixed end away from the main body, then bends towards the feeding end portion side and extends, and then extends to the free end close to the main body.

Optionally, a control part is arranged at the operation end part, and a transmission part is connected between the fixed end and the control part;

the control part operates the supporting part at the first position or the second position through the transmission part.

Optionally, the control part has a first operation position and a second operation position, the first operation position being farther from the feeding end than the second operation position;

the supporting part is connected to the main body between the fixed end and the free end through a first rotating shaft;

when the control part is from the first operation position to the second operation position, the supporting part rotates around the first rotating shaft, and the free end is inclined away from the feeding end part, so that the supporting part is from the first position to the second position.

Optionally, the transmission part is hinged with the fixed end.

Optionally, the transmission part is connected to the main body through a second rotating shaft;

The control part is provided with a first operation position and a second operation position, when the control part is from the first operation position to the second operation position, the control part retracts towards the main body, the transmission part rotates around the second rotating shaft, and the free end is inclined away from the feeding end part, so that the supporting part is from the first position to the second position.

Optionally, the main body has a transmission space, and a first window and a second window connected with the transmission space, and the transmission space accommodates the transmission part;

the first window hole is arranged at the feeding end part, the fixed end is positioned in the transmission space, and the free end extends out of the transmission space from the first window hole in the first position and the second position;

the second window hole is arranged at the operation end part, and the control part passes through the second window hole.

Optionally, the main body has an annular space or a central space extending from the feeding end portion to the operating end portion as the transmission space.

Optionally, the main body has a water delivery channel with a water receiving opening at the operation end and a water outlet at the feeding end.

Optionally, the surgical instrument further comprises a recoverer, wherein the recoverer is provided with a recovery end and a recovery channel is arranged in the recoverer, the recovery channel forms a recovery port at the recovery end, and the boundary of the recovery port is defined by an end wall surface; the protection tube, the memory alloy bracket and the recoverer are adapted to:

the recovery end is inserted into the protection pipe, the recovery device moves in the protection pipe and conveys cold water into the protection pipe, the cutting part is stimulated by the cold water, and the end wall surface extrudes the cutting part to reach a contracted state from the expanded state until the second support piece and the memory alloy support are contained in the recovery channel.

Optionally, the retriever comprises an inner rod and an outer rod with a central channel;

the recovery end is formed on the outer rod and the recovery port is communicated with the central channel;

the inner and outer bars are adapted to: the inner rod passes through the central passage, and the central passage portion between the inner rod and the outer rod serves as the recovery passage.

Optionally, the inner rod comprises a water delivery end with a water delivery port and a water outlet end with a water outlet, and a water delivery channel extending from the water delivery port to the water outlet is arranged in the inner rod.

Optionally, the water delivery end is provided with an external thread part;

the outer rod is provided with an internal threaded hole formed in the central channel at one end far away from the recovery end;

the inner and outer bars are adapted to: the external thread part and the internal thread hole form threaded fit, so that the external rod moves along the internal rod in the rotating process.

Optionally, the outer rod is provided with a plurality of water outlet holes, and the water outlet holes are communicated with the inside and the outside of the central channel.

Optionally, the end wall is inclined towards the radially outer side of the recovery port from the other end of the recovery device remote from the recovery end to the recovery end.

Optionally, the end wall surface is convex.

Optionally, the surgical instrument further comprises a retriever;

the recoverer comprises a recovery end and is internally provided with a recovery channel, the recovery channel forms a recovery port at the recovery end, and the boundary of the recovery port is defined by an end wall surface;

the recoverer comprises a water delivery end with a water delivery port and a water outlet end with a water outlet, and a water delivery channel extending from the water delivery port to the water outlet is arranged in the recoverer;

the protection tube, the memory alloy bracket and the recoverer are adapted to:

the recoverer moves in the protection pipe and conveys cold water into the protection pipe from the water delivery channel, the cutting part is stimulated by the cold water, and the end wall surface extrudes the cutting part from the expanded state to the contracted state until the memory alloy bracket enters the recovery channel.

Optionally, the protective tube is a urinary catheter.

Drawings

FIG. 1 is a perspective view of a memory alloy stent in a contracted state and an expanded state in a surgical instrument for treating prostatic hypertrophy according to an embodiment of the present invention, wherein FIG. 1 (a) shows the contracted state and FIG. 1 (b) shows the expanded state;

FIG. 2 is a front view of a protective tube in a surgical instrument for treating prostatic hyperplasia according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the fit relationship between the memory alloy stent shown in FIG. 1 and the protective tube shown in FIG. 2, wherein the memory alloy stent is in a contracted state;

FIG. 4 is a schematic view of the memory alloy stent and protective tube of FIG. 1 in an expanded state;

FIG. 5 is a cross-sectional view taken along the direction AA of FIG. 2;

fig. 6 is a cross-sectional view along BB of fig. 2;

FIG. 7 is a schematic view of the memory alloy stent and protective tube fitting relationship, with the memory alloy stent in a contracted state;

FIG. 8 is a perspective view of a conveyor in a surgical instrument for treating prostatic hyperplasia according to an embodiment of the present invention;

fig. 9 is a schematic view of the conveyor of fig. 8 with the support portion in the first position and the second position and the control portion in the first operating position and the second operating position, respectively, wherein fig. 9 (a) shows the support portion in the first position and the control portion in the first operating position, and fig. 9 (b) shows the support portion in the second position and the control portion in the second operating position;

FIG. 10 is a schematic view of the conveyor of FIG. 8 and the memory alloy stent of FIG. 1 in a mating relationship;

fig. 11 is an enlarged perspective view corresponding to the dashed box C in fig. 10;

FIG. 12 is a transparent schematic view of a conveyor in a surgical instrument for treating prostatic hypertrophy in accordance with an embodiment of the present invention;

FIG. 13 is a perspective view of a retriever in a surgical instrument for treating prostatic hyperplasia according to an embodiment of the present invention;

FIG. 14 is a schematic view of the memory alloy stent of FIG. 1 and the retriever of FIG. 13 in a fitting relationship;

FIG. 15 is a front view of the outer rod of the retriever of FIG. 13;

fig. 16 is a front view of the inner rod of the recycler of fig. 13.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

The surgical instrument for prostatic hyperplasia according to the technical scheme can comprise a memory alloy bracket and a protective tube. Referring to fig. 1, fig. 1 (a) shows the shape of the memory alloy stent 1 in the contracted state, and fig. 1 (b) shows the shape of the memory alloy stent 1 in the expanded state. The memory alloy stent 1 comprises a plurality of cut portions 10 spaced apart along the first circumferential direction. In the contracted state, the cutting portion 10 is in a contracted state or a collapsed state. The cutting portion 10 is adapted to expand outwardly from a contracted state to an expanded state upon stimulation by body temperature. Wherein, the memory alloy is also called shape memory alloy (Shape Memory Alloys, SMA), which is an alloy material capable of completely eliminating the deformation of the memory alloy at a lower temperature after heating and raising the temperature and recovering the original shape of the memory alloy before the deformation. The memory alloy stent 1 takes advantage of this "memory" property of memory alloys.

Referring to fig. 2, the protection tube 2 has an inlet 2a at one end and an insertion end 20 at the other end, and the insertion end 20 is formed with 3 through holes 2b distributed in the second circumferential direction of itself, and the protection tube 2 is inserted into the urethra. In operation, the insertion end 20 is used to insert the urethra first, the inlet 2a remains outside the body, and one function of the protective tube 2 is to protect the urethra.

In connection with a surgical procedure for treating prostatic hypertrophy, the protective tube 2 and the memory alloy stent 1 (see fig. 1) are adapted to: referring to fig. 1 and 2, the cutting portions 10 are adapted to the through holes 2b, for example, may be adapted in a one-to-one correspondence;

referring to fig. 3, first, the protective tube 2 is placed in the urethra such that the through-hole 2b corresponds to the position of prostatic hyperplasia, which is located on both sides of the urethral wall with the insertion end portion 20;

next, when the memory alloy stent 1 is in the contracted state, the memory alloy stent 1 is put into the protective tube 2 from the inlet 2a, and the cut portion 10 is aligned with the fitted through hole 2b in the radial direction of the protective tube 2, in which process the protective tube 2 is used to protect the urethral wall to prevent the cut portion 10 from cutting the urethral wall;

referring to fig. 4, after reaching the position of the through hole 2b of the protection tube 2, the cutting part 10 expands to return to the expanded state outside the adapted through hole 2b under the heating of body temperature. During the expansion, the incision portion 10 cuts the urethral wall, pressing the enlarged prostate. The memory alloy stent 1 is left for a while, and the cutting part 10 presses the enlarged prostate so that the prostate cannot supply blood for a long time and is atrophic to a normal size, thereby fundamentally removing the disease source of the prostatic hyperplasia. In addition, during the retaining process, the through hole 2b forms a limit for the cutting part 10, and the memory alloy bracket 1 is blocked from being displaced.

During the implantation process of the memory alloy stent 1, cold water can be simultaneously introduced into the protective tube 2, so that the cutting part 10 is prevented from being expanded and deformed outwards during the running process to be tightly attached to the wall of the protective tube 2, and the memory alloy stent 1 is ensured to be smoothly implanted into the focus position.

Referring to fig. 1, the cutting part 10 may be designed in a sharp filament shape with the filament cutting edge facing outward. During surgery, the filaments with the cutting edges facing outwards cut the urethral wall more easily.

Referring to fig. 2, the protective tube 2 may alternatively be a urinary catheter. The catheter is inserted into the bladder through the urethra, and urine is led out. At the insertion end of the catheter there is a balloon 23 for holding the catheter so that it remains in the bladder against removal. The types of the urinary catheters comprise a double-cavity urinary catheter, a three-cavity urinary catheter and the like. Wherein, the tube body of the double-cavity catheter is internally provided with two cavities, one is a urinary catheter cavity and the other is an inflation cavity (for inflating the air bag 23). The three-cavity catheter is provided with a flushing cavity besides the catheterization cavity and the inflation cavity and is used for bladder flushing treatment. Therefore, the protecting tube 2 does not need to be redesigned, the existing catheter is reasonably utilized, and the selectivity and interchangeability are high.

Referring to fig. 1, the memory alloy stent 1 further includes two end rings 11a, 11b, and two ends of each of all the cut portions 10 are fixedly connected to the two end rings 11a, 11b, respectively, and the cut portions 10 are supported between the two end rings 11a, 11 b. Referring to fig. 5 in combination, a first support 21 and a second support 22 are provided in the insertion end portion 20, and the first support 21, the second support 22, and the through hole 2b are arranged in this order from the insertion end portion 20 to the inlet 2 a. Referring to fig. 7, the protection tube 2 and the memory alloy stent 1 are adapted to: one of the end rings 11a, which is remote from the inlet 2a, passes between the second support 22 and the protection tube 2 and is defined between the first support 21 and the second support 22, while the other end ring 11b is located on the side of the through hole 2b that is close to the inlet 2 a. This also means that the first support 21 and the second support 22 contact and abut against the wall of the protection tube 2.

The first support 21 and the second support 22 support and limit the end ring 11a in two opposite directions, so as to maintain the stability of the memory alloy bracket 1 during operation. Meanwhile, in the operation, the first support piece 21 and the second support piece 22 play a role in positioning, and after the memory alloy bracket 1 passes through the second support piece 22 in the process of positioning and then meets the resistance of the first support piece 21, the positioning is indicated, so that the position of the through hole 2b is accurately positioned by the memory alloy bracket 1.

Referring to fig. 6 and 7, the first support 21 and the second support 22 are ring-shaped extending along the first circumferential direction of the protection pipe 2, which is advantageous in that the end ring 11a presses the second support 22 to deform to pass between the second support 22 and the pipe body of the protection pipe 2, on the one hand, and in that it saves costs on the other hand. At this time, at least the inner diameter of the second supporting member 22 should be ensured to be slightly smaller than the outer diameter of the end ring 11a, so that the second supporting member 22 can support the end ring 11a, and the memory alloy support 1 can be kept stable while avoiding the end ring 11a from leaking out of the center hole of the second supporting member 22.

Referring to fig. 5 and 6, the second support 22 has 3 notches 2c distributed along the first circumferential direction of the protection pipe 2, the notches 2c correspond to the positions of the through holes 2b, and may specifically form a one-to-one correspondence. Wherein the notch 2c divides the second support 22 into three sections. From the side of the second support 22 close to the inlet 2a, the through holes 2b extend towards the corresponding notches 2c and end between the first support 21 and the second support 22. Referring to fig. 7 in combination, the notch 2c allows the cut portion 10 to pass smoothly, and the end ring 11a is reached and confined between the first support 21 and the second support 22.

Accordingly, referring to fig. 1, 2 and 6, the cut portions 10, the through holes 2b and the notches 2c are in one-to-one correspondence. In other variations, one through hole may correspond to at least two cuts simultaneously, and in operation, at least two cuts may be aligned with and flared outwardly from one through hole simultaneously. Alternatively, in a modification, one notch may correspond to at least two through holes at the same time, and at least two through holes pass through one notch at the same time. The number of the cutting portions, the through holes, and the notches is not limited to 3, and may be 3 or more.

Referring to fig. 7, the surface of the second support 22 facing the protection pipe 2 is a slope 220, and the slope 220 is inclined to the radial inside of the protection pipe 2 in the direction from the second support 22 to the first support 21. During the process of placing the memory alloy bracket 1, the end ring 11a presses the edge of the second support member 22, and the inclined surface 220 forms smaller shearing stress, so that the second support member 22 is easy to generate shearing deformation at the position of the inclined surface 220, and the end ring 11a is easy to press and pass. The operation difficulty of the implantation process of the memory alloy stent 1 is reduced.

Meanwhile, the surface of the second support piece 22 facing away from the first support piece 21 has larger shearing stress, when the end ring 11a is positioned between the first support piece 21 and the second support piece 22, even if the end ring 11a presses the inclined plane 220, the surface of the second support piece 22 facing away from the first support piece 21 is not easy to deform, good supporting and limiting effects are achieved on the memory alloy support 1, and the stability of the memory alloy support 1 is good.

Further, the surface of the first support 21 facing the protection pipe 2 is a slope 210, and the slope 210 is inclined to the radial inside of the protection pipe 2 in the direction from the first support 21 to the second support 22. When the end ring 11a is located between the first support member 21 and the second support member 22 and is supported on the inclined surface 210, even if the end ring 11a presses the inclined surface 210, the surface of the first support member 21 facing away from the second support member 22 is not easy to deform due to the large shearing stress, so that the end ring 11a cannot pass through the first support member 21.

Therefore, the inclined planes 210 and 220 enable the end ring 11a to move only between the first supporting piece 21 and the second supporting piece 22, the memory alloy bracket 1 does not have free problems, the first supporting piece 21 and the second supporting piece 22 have good supporting and limiting effects on the memory alloy bracket 1, and the memory alloy bracket 1 has good stability.

The first support 21 and the second support 22 are symmetrically distributed along the axial direction of the protection tube 2, and the first support 21 is also formed with a notch 2c along the first circumferential direction. Therefore, the first support 21 and the second support 22 can be shared, and the design cost is reduced.

The first support 21 and the second support 22 are both made of silicone, have a certain elasticity,

wherein the surgical instrument for prostatic hypertrophy further comprises a conveyor, the conveyor being applied to convey the memory alloy stent to the focal location. Referring to fig. 8, the conveyor includes a main body 3 and a plurality of supporting portions 30, wherein the main body 3 has a feeding end portion 3a and an operating end portion 3b on an axis, and all the supporting portions 30 are provided at the feeding end portion 3a and distributed around the axis. Referring to fig. 9 in combination, the support portion 30 includes a fixed end 3c and a free end 3d, the fixed end 3c being fixed to the main body 3, the free end 3d being farther from the axis and from the operation end 3b than the fixed end 3 c. The support portion 30 has a first position shown in fig. 9 (a) and a second position shown in fig. 9 (b), in which the free end 3d is located outside the main body 3, and the distance from the free end 3d to the main body 3 in the first position is smaller than the distance from the main body 3 in the second position.

Referring to fig. 3, 10 and 11 in combination, the conveyor, the memory alloy stent 1 and the protective tube 2 are adapted to: first, the support 30 is operated in the second position, and since the distance from the free end 3d to the main body 3 is large, one of the end rings 11b of the operation memory alloy bracket 1 is interposed between the support 30 and the main body 3, and the end ring 11b surrounds the main body 3.

Then, the operation support portions 30 are in the first position, at which time the free ends 3d gradually return toward the main body 3, so that the distance from the main body 3 decreases, one of the end rings 11b is supported between all the support portions 30 and closer to the operation end portion 3b than the other end ring 11b, and the memory alloy bracket 1 is fixed to the main body 3.

Thereafter, the operation feeding end portion 3a is inserted into the protection tube 2, and simultaneously the main body 3 is conveyed into the protection tube 2. The delivery is carefully slow and when resistance is detected, the end ring 11a of the memory alloy stent 1 is predicted to have hit the second support 22 (see fig. 7). At this time, the end ring 11a is forced to pass over the second support 22 with a slight force and the conveyance is stopped, and at the same time the body 3 is rotated to adjust the through hole 2b into which the cutting part 10 is fitted in the radial alignment of the protection tube 2, and when a large resistance occurs during the rotation, the cutting part 10 is described as being fitted into the fitted through hole 2 b;

Finally, the support 30 is operated at the second position, at which time the free end 3d gradually moves away from the main body 3, so that the distance to the main body 3 increases. At this time, the main body 3 is taken out, the main body 3 moves to the outside of the protection tube 2, so that the end ring 11b is easily separated from the support portion 30 from the free end 3d side, and the fixed memory alloy stent 1 slowly returns to the expanded state under the stimulation of the body temperature and arches out of the protection tube 2 along the fitting through hole 2 b.

Referring to fig. 9, the first position may be a natural state of the support 30. Alternatively, the first position is an intermediate position between the natural state of the support portion 30 and the second position, and the support portion 30 may be closer to the main body 3 or housed in the main body 3 in the natural state. The support portion 30 may have a certain elasticity so as to provide a certain elastic pre-tightening force in the first position, thereby enhancing the fixing effect of the support portion 30. The main body 3 provides a feasible scheme that the memory alloy bracket 1 is arranged in the protection tube 2, and the use is convenient and the feasibility is high.

Referring to fig. 6, when the first support 21 and the second support 22 are ring-shaped, in a conveying engagement, the end ring 11b may be wound around the main body 3, all the cut portions 10 may be distributed around the main body 3, and the end ring 11a may be further wound around the main body 3, so that the memory alloy stent 1 entirely surrounds the main body 3, in combination with fig. 3, 10 and 11. In the conveying process, the main body 3 can penetrate out of the central holes of the second supporting piece 22 and the first supporting piece 21, and the memory alloy bracket 1 is sleeved outside the main body 3, so that the stability in the conveying process is good. In a variant, the support is positioned such that only one of the two end rings of the memory alloy stent, which is close to the operating end, encircles the conveyor and the other end ring does not encircle the conveyor, which also makes it possible to mount the memory alloy stent in place.

Referring to fig. 9, the support portion 30 extends from the fixed end 3c away from the main body 3, bends toward the feeding end 3a, extends, and extends to the free end 3d near the main body 3. Thus, the support portion 30 includes: a first extension 301 extending from the fixed end 3c away from the main body 3, a bending portion 300 bending and extending from the first extension 301 toward the feeding end 3a side, and a second extension 302 extending closer to the main body 3 to the free end 3d. Thus, the support portion 30 is of a hook and clamp structure.

Referring to fig. 11 in combination, during the delivery of the memory alloy stent 1, the end ring 11b is constrained between the first extension 301 and the second extension 302 and further may be clamped by the bent portions 300 of all the support portions 30 such that the end ring 11b is supported between all the support portions 30.

Referring to fig. 9, an opening 3e is formed between the free end 3d of the support portion 30 and the main body 3. In the second position, the opening 3e is large in size, and the end ring 11b (see fig. 11) is easily passed between the free end 3d and the main body 3, so that the restriction of the support portion 30 is released during the removal of the main body 3.

In one modification, the support portion extends away from the main body from the fixed end, and then bends toward the feeding end portion side and extends to the free end. At this time, the supporting portion only includes the first extending portion and the bending portion, and the free end is located at the bending portion. When the memory alloy bracket is fixed, the end ring of the memory alloy bracket can be supported at the bending part and clamped and fixed by the bending part.

Referring to fig. 9 and 12, a control unit 31 is provided at the operation end portion 3b, and a transmission unit 32 is connected between the fixed end portion 3c and the control unit 31. The control portion 31 operates the support portion 30 in the first position or the second position through the transmission portion 32, and the transmission portion 32 functions therein to transmit the motion of the control portion 31 to the support portion 30. This provides a idea of how to operate the support 30 effectively.

In one possible embodiment, referring to fig. 9, the control portion 31 has a first operation position shown in fig. 9 (a) and a second operation position shown in fig. 9 (b), the first operation position being farther from the feeding end portion 3a than the second operation position. The support portion 30 is connected to the main body 3 between the fixed end 3c and the free end 3d through a first rotation shaft 33. When the control portion 31 is moved from the first operation position to the second operation position, the support portion 30 is rotated about the first rotation shaft 33 and the free end 3d is inclined away from the feeding end 3a, so that the support portion 30 is moved from the first position to the second position. Thus, in the first operating position, the control portion 31 holds the support portion 30 in the first position by the transmission portion 32, and in the second operating position, the control portion 31 holds the support portion 30 in the second position by the transmission portion 32.

Further, the transmission part 32 is hinged to the fixed end 3c, and the hinge point is rotated synchronously with the support part 30 when the support part 30 rotates about the first rotation shaft 33. The cementing may comprise: the fixed end 3c is protruded with a protrusion (not shown in the drawing), and the transmission portion 32 is connected with the protrusion by a movable pin.

The transmission portion 32 may be a shaft, and has a certain strength to transmit motion.

Referring to fig. 8, 9 and 12, the main body 3 has a driving space 3h, and first and second windows 3f and 3g (not shown in fig. 8 and 12) connecting the driving space 3h, the driving space 3h accommodating the driving part 32. Referring to fig. 13, a first window 3f is provided at the feeding end portion 3a, a fixed end 3c is positioned in the transmission space 3h, and a free end 3d extends from the first window 3f out of the transmission space 3h in the first position and the second position. Thus, during delivery, with reference to fig. 11, at least the end ring 11a of the memory alloy stent 1 is wrapped around the body 3.

The second window 3g is provided at the operation end portion 3b, and the control portion 31 passes through the second window 3g and further can extend out of the transmission space 3h, thereby facilitating the operation by the operator. Meanwhile, the transmission part 32 is encapsulated inside the main body 3, and the structure is more compact.

Referring to the foregoing, the first position may be a natural state of the support portion. Alternatively, the first position may be an intermediate position intermediate the natural state and the second position, in which case the support portion may be located largely or entirely within the transmission space in the natural state.

Referring to fig. 8 and 9, the main body 3 has an annular space extending from the feeding end portion 3a toward the operating end portion 3b as a transmission space 3h. For example, the main body 3 includes an inner cylinder 34 and an outer cylinder 35 fitted over the inner cylinder 34, the annular space being defined by the inner cylinder 34 and the outer cylinder 35, and the transmission portion 32 being located between the inner cylinder 34 and the outer cylinder 35. In one modification, the conveyor has a central space extending from the feeding end portion to the operation end portion as a transmission space.

Referring to fig. 8 and 12, the main body 3 has a water delivery passage 3i, the water delivery passage 3i having a water receiving opening 3j (not shown in fig. 12) at the operation end portion 3b and a water outlet opening 3k at the feeding end portion 3 a. The water delivery channel 3i is used for delivering cold water in the delivery process of the memory alloy bracket 1 (refer to fig. 3), so that the pipe body of the protection pipe 2 (refer to fig. 3) is kept at a lower temperature, and the expansion of the memory alloy bracket 1 in the placement process is avoided, so that the delivery obstruction is increased, and even the protection pipe 2 is scratched.

Wherein the central hole of the inner cylinder 34 can be used as the water delivery channel 3i. In other embodiments, the conveyor includes only one outer barrel and a central bore defined by the outer barrel to double as a drive space and a water delivery channel.

In addition to the cooperation of the supporting portion 30, the transmission portion 32 and the control portion 31 in this embodiment, in a modification, the transmission portion is connected to the conveyor through a second rotation shaft; the control part is provided with a first operation position and a second operation position, when the control part is from the first operation position to the second operation position, the control part retracts into the conveyor, the transmission part rotates around the second rotating shaft, and the free end is inclined away from the feeding end part, so that the supporting part is from the first position to the second position.

Referring to fig. 4, after the treatment, the memory alloy stent 1 needs to be removed from the protective tube 2. Thus, the surgical instrument for treating prostatic hypertrophy further comprises a retriever for retrieving the memory alloy stent 1 from within the protective tube 2.

Referring to fig. 13 and 14, the recovery device 5 includes a recovery end 5a and a recovery passage 5b is provided in the recovery device 5, the recovery passage 5b forming a recovery port 5aa at the recovery end 5a, the boundary of the recovery port 5aa being defined by an end wall surface 50.

Referring to fig. 4 in combination, the protection tube 2, the memory alloy holder 1 and the retriever 5 are adapted to:

first, the recovery end 5a is operated to enter the protection tube 2, the recovery device 5 slowly moves in the protection tube 2, cold water is continuously supplied into the protection tube 2, the cold water flows to the memory alloy bracket 1, the memory alloy bracket 1 is cooled, and the cutting part 10 is gradually cooled by the cold water.

Then, when the retriever 5 moves to the position of the memory alloy stent 1, the end ring 11b first enters the retrieval port 5aa, and the end wall surface 50 presses the cooled cut portion 10 to return from the expanded state to the contracted state until the second support 22 (see fig. 7) and the memory alloy stent 1 are received in the retrieval channel 5b.

Finally, the retriever 5 is withdrawn outwards, and the memory alloy stent 1 is retrieved.

In this process, the cutting part 10 is pressed by the external force of the end wall surface 50 while being stimulated by the cold water by utilizing the characteristics of the memory alloy, and can be restored to the original contracted state, so that the cold water stimulation in the recovery process is necessary.

Referring to fig. 14, the end wall surface 50 defines the boundary of the recovery port 5 aa. The recovery port 5aa is formed as a flare in such a manner that the end wall surface 50 is inclined radially outward of the recovery port 5aa from the other end (water feed end 5 c) of the recovery device 5 away from the recovery end 5a toward the recovery end 5 a. In this way, the end ring 11b can easily enter the recovery port 5aa from the side with the larger opening size of the recovery port 5aa, and further, both the end ring 11b and the cutting portion 10 are in contact with the end wall surface 50, thereby preventing the memory alloy stent 1 from being cut. Further, the end wall surface 50 is convex, which is more advantageous for the memory alloy holder 1 to be in contact with the end wall surface 50.

The second support 22 (see fig. 7) contacts the recovery end 5a and can be elastically deformed to be recovered in the recovery passage 5 b. Alternatively, the second support 22 may be further cut by the retrieval end 5 a. At this time, the recovery end 5a may be designed as a ring-shaped blade so that the second support 22 is easily cut off, ensuring no resistance when exiting the recovery 5 outwards.

Further, referring to fig. 13 and 14, the recoverer 5 includes a water feed end 5c having a water feed port 5cc and a water discharge end 5d having a water discharge port 5dd, and a water feed passage 5cd extending from the water feed port 5cc to the water discharge port 5dd is further provided in the recoverer 5. Thus, with reference to fig. 4 in combination, the protection tube 2, the memory alloy support 1 and the retriever 5 are adapted to: when the recovery device 5 is inserted into the protection pipe 2, cold water is fed into the water feed passage 5cd through the water feed port 5cc, and the cold water flows into the protection pipe 2 from the water feed passage 5cd, thereby feeding the cold water into the protection pipe 2 from the water feed passage 5cd. Therefore, the recoverer 5 has both the recovery function and the water supply function, which is advantageous for efficiently recovering the memory alloy bracket 1.

Referring to fig. 13 to 15, the retriever 5 includes an inner rod 51 and an outer rod 52 having a central passage 5e, a retrieving end 5a formed in the outer rod 52 and a retrieving port 5aa communicating with the central passage 5e; the inner rod 51 and the outer rod 52 are adapted to: the inner rod 51 passes through the central passage 5e, and the central passage portion between the inner rod 51 and the outer rod 52 serves as the recovery passage 5b. During recovery, referring to fig. 4 in combination, the inner rod 51 and the outer rod 52 are adapted to:

firstly, the water outlet end 5d of the inner rod 51 is operated to insert the protection tube 2, the inner rod 51 passes through the end ring 11b of the memory alloy bracket 1 and all the cutting parts 10 are distributed outside the inner rod 51 until the inner rod 51 abuts against the second supporting piece 22 (refer to fig. 7), and the second supporting piece 22 plays a role in positioning;

Next, the outer rod 52 is operated to insert the protection tube 2 externally around the inner rod 51 so that the inner rod 51 passes through the central passage 5e;

next, the resistance of the outer rod 52 against the forward movement indicates that the end wall surface 50 contacts the memory alloy stent 1, and at this time, the advancing speed of the outer rod 52 is slowed down, the memory alloy stent 1 is deformed and recovered in a cold state by the pressing of the end wall surface 50 and the inner rod 51, and the central passage portion between the inner rod 51 and the outer rod 52 serves as a recovery passage 5b for recovering the memory alloy stent 1. When the outer rod 52 abuts against the first support 21 (see fig. 7), the inner rod 51 and the outer rod 52 can be withdrawn together from the protective tube 2 (see fig. 4). Alternatively, further, the outer rod 52 may further retract the first support 21 within the outer rod 52.

In this process, the inner rod 51 is thinner than the outer rod 52, and can be smoothly inserted into the protection tube 2 without substantially damaging the protection tube 2 during the traveling. Meanwhile, the outer rod 52 is thicker, but the inner rod 51 plays a guiding role for the advancing of the outer rod 52, so that the outer rod 52 can still advance smoothly.

Further, referring to fig. 16, a water feed end 5c, a water discharge end 5d, and a water feed passage 5cd of the recoverer 5 are formed in the inner rod 51. Thus, the inner rod 51 includes a water feed end 5c having a water feed port 5cc and a water discharge end 5d having a water outlet 5dd, and a water feed passage 5cd extending from the water feed port 5cc to the water outlet 5dd is provided in the inner rod 51. Referring to fig. 14 and 4 in combination, during the recovery process, the inner rod 51 is first inserted into the protection tube 2 and abuts against the second support 22 (refer to fig. 7) and is aligned with the center hole of the second support 22. After that, during the insertion of the outer rod 52 into the protection tube 2, the cold water fed from the water feed passage 5cd cools the cutting portion 10.

13-15, the outer rod 52 is provided with a plurality of water outlet holes 5f, and the water outlet holes 5f are communicated with the inside and the outside of the central channel 5 e. During the insertion of the outer rod 52 into the protective tube 2 (see fig. 4), cold water is fed into the protective tube 2 from the water feed channel 5cd (see fig. 16), and flows into the recovery channel 5b between the inner rod 51 and the outer rod 52 while cooling the memory alloy holder 1, so that the cold water in the recovery channel 5b can flow out from the water outlet hole 5f into the protective tube 2 and be discharged. On the one hand, this can avoid cold water accumulating in the recovery channel 5b and causing the outer rod 52 to be "head heavy and foot light", so that the operating force of the operator is uncontrollable, and the outer rod 52 may shake during pushing, which affects the operating accuracy of the operator. On the other hand, in the process of pushing the outer rod 52 into the protection tube 2, the operator needs to feel that the outer rod 52 encounters the resistance of the first supporting part 21 and the second supporting part 22 (refer to fig. 7) to judge the progress of the outer rod 52, and the cold water in the recovery channel 5b is timely discharged from the water outlet hole 5f, so that the accumulated cold water is prevented from interfering with the 'feel' of the operator to influence the judgment of the recovery progress of the operator, and the operation precision and quality are improved. Furthermore, during the recovery process, the memory alloy support 1 starts to be squeezed into the recovery channel 5b, and at this time, the cold water in the recovery channel 5b is timely discharged, so that the shaking of the outer rod part extending into the protection tube 2 caused by the accumulated water in the recovery channel 5b can be avoided, and the cutting part 10 which is not completely received in the recovery channel 5b is prevented from causing re-cutting damage to the urethral wall due to shaking.

The water outlet holes 5f may be circular holes, or in further embodiments, rectangular holes, bar-shaped holes, waist-shaped holes, and other shaped holes. The water outlet holes 5f may be distributed in the circumferential direction and the longitudinal direction of the outer rod 52 on the circumferential wall thereof. In a further embodiment, when the water outlet holes are rectangular holes, bar-shaped holes or waist-shaped holes, the water outlet holes can extend along the length direction of the outer rod and are distributed along the circumferential direction of the outer rod in sequence, which is equivalent to opening windows on the circumferential wall of the outer rod.

Referring to fig. 15, the outer rod 52 is provided at an end remote from the recovery end 5a with an internally threaded hole 5ee formed in the central passage 5 e; referring to fig. 16, the water delivery end 5c is provided with a male screw portion 510, and the male screw portion 510 is provided on the outer peripheral surface of the water delivery end 5 c. Referring to fig. 14 in combination, during recovery, the inner rod 51 and the outer rod 52 are adapted to: the inner rod 51 is inserted into the protection tube 2 first, and then the outer rod 52 is sleeved outside the inner rod 51 and the outer screw portion 510 is screw-fitted with the female screw hole 5ee, so that the outer rod 52 moves along the inner rod 51 during rotation. Specifically, the outer rod 52 contacts and cuts off the second support 22 (see fig. 4 in combination) and then contacts the first support 21 (see fig. 4 in combination) during the rotational travel, indicating that the specified position is reached.

In addition, the inner rod 51 and the outer rod 52 are connected together by screw thread fit, so that the inner rod 51 and the outer rod 52 are not easy to separate in the advancing process of operating the outer rod 52, and the operation is convenient.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A surgical instrument for treating prostatic hyperplasia, comprising:

a conveyor;

In the expanded state, the cutting portion expands outward of the adapted through hole;

the conveyor comprises a main body and a plurality of supporting parts;

the conveyor, the memory alloy support and the protective tube are adapted to:

in the first position, the memory alloy stent is supported between all of the support portions, the main body delivering the memory alloy stent to the insertion end portion;

2. The surgical instrument of claim 1, wherein the memory alloy stent further comprises two end rings, wherein two ends of each of the cutting portions are fixedly connected to the two end rings, respectively;

the protection tube and the memory alloy bracket are adapted to:

one of the two end rings, which is remote from the inlet, passes between the second support and the protective tube and is defined between the first support and the second support.

3. The surgical instrument of claim 2, wherein the second support has a plurality of indentations distributed along the first circumference;

4. The surgical instrument of claim 2, wherein a surface of the second support facing the protective tube is beveled, the beveled facing radially inward of the protective tube in a direction from the second support to the first support.

5. The surgical instrument of claim 2, wherein a surface of the first support facing the protective tube is beveled, the beveled facing radially inward of the protective tube in a direction from the first support to the second support.

6. The surgical instrument of claim 2, wherein the first and second supports are annular in shape extending along the first circumference.

7. The surgical instrument according to claim 1, wherein the support portion is bent toward the delivery end portion side and extends to the free end after extending from the fixed end portion away from the main body.

8. The surgical instrument according to claim 1, wherein the support portion extends away from the main body from the fixed end, bends toward the delivery end side, extends, and extends toward the main body to the free end.

9. The surgical instrument according to claim 1, wherein a control portion is provided at the operation end portion, and a transmission portion is connected between the fixed end portion and the control portion;

10. The surgical instrument of claim 9, wherein the control portion has a first operative position and a second operative position, the first operative position being farther from the delivery end than the second operative position;

11. The surgical instrument of claim 10, wherein the transmission portion is hinged to the fixed end.

12. The surgical instrument of claim 9, wherein the transmission is coupled to the body via a second shaft;

13. The surgical instrument of claim 9, wherein the body has a drive space, and first and second fenestrations connecting the drive space, the drive space housing the drive section;

14. The surgical instrument of claim 13, wherein the body has an annular space or central space extending from the delivery end to the manipulation end as the drive space.

15. The surgical instrument of claim 1, wherein the body has a water delivery channel having a water receiving port at the operative end and a water outlet port at the delivery end.

16. The surgical instrument of claim 2, further comprising a retriever having a retrieval end and a retrieval channel disposed therein, the retrieval channel forming a retrieval port at the retrieval end, the retrieval port being bounded by an end wall surface;

The protection tube, the memory alloy bracket and the recoverer are adapted to:

17. The surgical instrument of claim 16, wherein the retriever comprises an inner rod and an outer rod having a central channel;

18. The surgical instrument of claim 17, wherein the inner rod includes a water delivery end having a water delivery port and a water outlet end having a water outlet, the inner rod having a water delivery passage disposed therein extending from the water delivery port to the water outlet.

19. The surgical instrument of claim 18, wherein the water delivery end is provided with an external threaded portion;

20. The surgical instrument of claim 18, wherein the outer rod is provided with a plurality of water outlet holes, the water outlet holes communicating between the interior and exterior of the central passage.

21. The surgical instrument of claim 16, wherein the end wall is sloped radially outward of the recovery port from the other end of the recovery distal from the recovery end to the recovery end.

22. The surgical instrument of claim 21, wherein the end wall surface is convex.

23. The surgical instrument of claim 1, further comprising a retriever;

The protection tube, the memory alloy bracket and the recoverer are adapted to:

24. The surgical instrument of claim 1, wherein the protective tube is a urinary catheter.