CN111134919A

CN111134919A - Magnetic suction tube-drawing type ureteral stent

Info

Publication number: CN111134919A
Application number: CN201911306682.8A
Authority: CN
Inventors: 李益民; 赵志刚; 杨林
Original assignee: Hunan Hande Minimally Invasive Medical Science & Technology Co ltd
Current assignee: Hunan Hande Minimally Invasive Medical Science & Technology Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-05-12
Anticipated expiration: 2040-03-30
Also published as: CN111134919B

Abstract

The invention discloses a magnetic suction tube-drawing ureteral stent, which comprises a stent body, a stent head and a stent tail which are integrally formed and have the same outer diameter, wherein a plurality of secondary passive suction structures are arranged at intervals in the circumferential direction of the stent tail, each secondary passive suction structure is a secondary passive suction head fixedly sleeved in the stent tail or a secondary passive suction ring fixedly sleeved outside the stent tail, a through hole is formed in each secondary passive suction head, a passive suction head is fixedly arranged at the end part of the stent tail, a wire guide cavity is formed in each passive suction head, and each secondary passive suction head, each secondary passive suction ring and each passive suction head are made of soft magnetic metal materials or magnetic suction metal materials. By adopting the ureteral stent, the convenience and the efficiency of tube placement and tube drawing are simultaneously considered, the success rate of one-time tube drawing is improved, meanwhile, the damage of the device to a patient is reduced, the probability of infection of the patient is reduced, and the use cost of doctors and patients is reduced.

Description

Magnetic suction tube-drawing type ureteral stent

Technical Field

The invention relates to the field of medical instruments, in particular to a magnetic suction tube-drawing type ureteral stent.

Background

In urinary surgery, the implantation of ureteral stents is an indispensable conventional operation procedure, and is widely applied to hospitals at home and abroad. The implanted ureteral stent tube plays a role in temporary supporting and drainage of a human ureter in vivo, and after several months of operation, the ureteral stent is taken out after the function of the human ureter is recovered and a conventional cystoscope extubation operation is carried out. The existing cystoscope is a hard lens made of metal and thick in size, can cause intolerable pain during tube drawing, can cause unavoidable scratch and even bleeding to the urethra (particularly the urethra of a male), and is very easy to cause wound infection. Clinically, in response to the above problems, many painless tube-drawing methods and new ureteral stent technology have been developed. These techniques mainly include the following categories:

1) absorbable and degradable ureteral stents: the tube body of the stent is made of materials which can be degraded by human urine and absorbed by ureter tissues, but the stent is in the research stage at present, and has the key problems that the degradation speed is difficult to control due to the variable ingredients of the human urine, and the degraded fragments block the ureter and the urethra, and the like which need to be solved.

2) Ureteral stents with silk threads: the tail end of the ureteral stent is penetrated with a slender nylon wire, the nylon wire is left at the urethral orifice along the urethra when the ureteral stent is placed, and the nylon wire only needs to be pulled outwards after the operation of tube drawing, so that the tube drawing which can be fast and has less pain is realized. However, such stents run the risk of urine leaving the urethra along with the nylon filaments, causing involuntary urination and bacterial retrograde infection, and are only suitable in cases where the implantation time is short.

3) Using a mechanical extubation device like a snare: for example, patent proposals with publication numbers CN208541386U and CN208893417U propose that the front end of the catheter is provided with a ring sleeve which rotates in the bladder of the human body to sleeve the tail end of the ureteral stent and pull back, and the tube pulling of the proposal cannot be positioned, and the blind operation results in low success, and no relevant product commercialization reports exist.

4) The method for pulling the tube by magnetic attraction comprises the following steps: in 1989, the american urological journal 142, vol.3, page 701, discloses a double J-tube thesis with magnetic heads applied to a markruo (macaruso), which is the first international publication on magnetic tube drawing, and the magnetic tube drawing method is used for replacing the original rigid cystoscope tube drawing, so that the magnetic tube drawing device has the advantages of high patient tube drawing comfort, less bleeding and small wound, and quickly causes corresponding research and clinical application of many scholars and doctors at home and abroad. Patents such as grant publication numbers CN206167594U, CN207666961U and US4790809A propose to solve the above problems by mounting corresponding magnets on a flexible catheter, by magnetically attracting a metal head or magnet mounted on the ureteral stent. However, the relative position between the magnetic head on the tube drawing device and the magnet on the ureteral stent in the magnetic suction scheme is not known in the human bladder due to blind operation, the two are not always in the range of mutual attraction, the success rate of drawing the tube once through the blind operation is not high, the operation is usually repeated, the tube has to be repeatedly inserted into the urethra, the damage to the urethra is undoubtedly aggravated, the strong magnet is arranged on the ureteral stent, and the safety of the strong magnet is controversial because the strong magnet has the problems of corrosion and nuclear magnetism incompatibility in the human urine. At present, a commercialized product in the market is a Blackstar magnetic ureteral stent which is sold by the company UROTECH in Germany, and in order to ensure the success rate of tube drawing, a strong magnet with the diameter larger than that of the stent is hung at the tail end of the ureteral stent, but the product cannot be used for tube placing through a conventional rapid tube placing method such as a ureteroscope, and can only be used for tube placing through a method of placing a guide wire in advance, so that the product has the defects of large time consumption and small application range during implantation, and cannot be popularized and applied in a large area. Therefore, if the magnetic pipe drawing scheme is to be really feasible, two points are needed: 1. the success rate of one-time tube drawing is high, and multiple tube drawing is not needed; 2. the existing pipe placing mode cannot be changed.

Through the analysis, the ureteral stent can hopefully have the advantages of using the magnetic suction method to pull out the tube, but does not change the existing tube placing operation method, has very high tube pulling success rate, is safe and reliable, has lower manufacturing cost and feasible process, is suitable for large-scale popularization, is convenient for doctors to use, and can reduce the operation cost of patients.

Disclosure of Invention

In view of this, the present invention provides a magnetic suction catheter-pulling ureteral stent to overcome the defects in the prior art, so as to simultaneously consider the convenience and efficiency of catheter placement and catheter pulling, improve the success rate of one-time catheter pulling, and reduce the injury of the apparatus to the patient.

The invention solves the problems through the following technical means: the utility model provides a pull out tubular ureteral stent is inhaled to magnetism, includes integrated into one piece and the unanimous support body of external diameter, support head and support afterbody, the equal interval is provided with a plurality of drainage holes on the support body of support body, support head and support afterbody all are the circlewise, support afterbody circumference interval is provided with a plurality of secondary passive suction structures, secondary passive suction structure is fixed endotheca in the secondary passive suction head of support afterbody or fixed overcoat in the secondary passive suction ring of support afterbody, the through-hole has been seted up in the secondary passive suction head, the end fixing of support afterbody is provided with passive suction head, passive suction head has seted up the cavity in the passive suction head, secondary passive suction ring and passive suction head are made by soft magnetic metal material or magnetism.

Further, the passive suction head comprises a head end, a fastening section and an inverted buckle body which are integrally formed, the outer diameter of the head end is consistent with that of the tail part of the support, and the fastening section and the inverted buckle body form a stepped shaft type structure and form a stepped shaft hole type assembly form with the tail part of the support.

Furthermore, a fastening ring is sleeved outside the position fixing sleeve corresponding to the fastening section at the tail part of the bracket.

Further, adjacent drainage holes are circumferentially staggered by 180 degrees.

Furthermore, the quantity of the drainage holes at the tail part of the bracket is 2-3 times of that of the drainage holes at the head part of the bracket.

Furthermore, scale marks are arranged on the support body.

Further, the secondary passive suction structure is a secondary passive suction head which is fixedly sleeved at the tail of the support, the length of the secondary passive suction head is 2-3mm, and the interval between adjacent secondary passive suction heads is 3-6 mm.

Further, the secondary passive suction structure is a secondary passive suction ring which is fixedly sleeved on the tail of the support, the length of the secondary passive suction ring is 2-3mm, and the interval between every two adjacent secondary passive suction rings is 2-4 mm.

The invention has the beneficial effects that: the utility model provides a pipe formula ureteral stent is drawn to magnetism, including the unanimous support body of integrated into one piece and external diameter, support head and support afterbody, the equal interval is provided with a plurality of drainage holes on the support body of support body, support head and support afterbody all are the circled form, support afterbody circumference interval is provided with a plurality of secondary passive suction structures, secondary passive suction structure is fixed endotheca in the secondary passive suction head of support afterbody or fixed overcoat in the secondary passive suction ring of support afterbody, the through-hole has been seted up in the secondary passive suction head, the end fixing of support afterbody is provided with passive suction head, the wire chamber has been seted up in the passive suction head, secondary passive suction ring and passive suction head are made by soft magnetic material or magnetism metal material. Adopt the ureteral stent of this application, through at a plurality of secondary passive attraction structures of support afterbody equipartition, inhale the scope with magnetism and enlarge, improved the convenience of extubation, efficiency and the success rate of extubation once greatly, reduced the damage of apparatus to the patient, reduced the probability of patient infection and reduced the cost that doctors and patients used, simultaneously, the passive attraction structure cup joints with the support afterbody, can make the pipe diameter of support remain unchanged basically, consequently compromise the convenience and the efficiency of putting the pipe.

Drawings

The invention is further described below with reference to the figures and examples.

Fig. 1 is a schematic perspective view of the ureteral stent of the present invention.

Fig. 2 is a front view of a ureteral stent of the present invention.

Fig. 3 is a front sectional view and a rear sectional view of the tail of the stent of the present invention.

Fig. 4 is a schematic view of a secondary passive suction structure of the ureteral stent of the present invention.

Fig. 5 is a cross-sectional view of a secondary passive suction tip of the ureteral stent of the present invention.

Fig. 6 is a front view of another ureteral stent of the present invention.

Fig. 7 is a cross-sectional view of the tail of another ureteral stent of the present invention.

Fig. 8 is a tail end cross-sectional view of a ureteral stent of the present invention.

Fig. 9 is a cross-sectional view of a passive suction tip of the ureteral stent of the present invention.

Fig. 10a-10d are schematic views of the process of extracting the ureteral stent of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the size of the magnetic pull tube type ureteral stent of the embodiment has various specifications of an outer diameter of 4F-8F and a length of 14cm-32cm, is made of a soft medical polyurethane or silica gel single-lumen tube, mainly plays a role in supporting and draining in vivo, and has good biocompatibility and no stimulation to human tissues. The support specifically comprises a straight-tube-shaped support body 1, a ring-shaped support head B and a ring-shaped support tail A which are integrally formed and have the same outer diameter. A plurality of drainage holes 1-1 for drainage are uniformly arranged on the support tube body 1-3 of the support body 1, the support head B and the support tail A at intervals, and preferably, the adjacent drainage holes 1-1 are circumferentially staggered by 180 degrees, so that the strength of the support tube body is not excessively reduced while the drainage effect is ensured, and the use safety of the support tube body is ensured. The bracket tube body 1-3 is provided with scale marks 1-2, so that doctors can conveniently master the depth of the tube during operation.

The support tail part A is uniformly provided with a plurality of secondary passive suction structures 3 in the circumferential direction, and the secondary passive suction structures 3 are secondary passive suction heads fixedly sleeved on the support tail part in an inner sleeve mode. The end part of the tail part of the bracket is fixedly provided with a passive suction head 2, and a guide wire cavity 2-4 is formed in the passive suction head. The secondary passive suction head and the passive suction head are both made of soft magnetic metal materials, when the secondary passive suction head and the passive suction head are implanted into a body, a magnetic field is not generated, and external metal substances cannot influence a ureteral stent implanted into the body; when the large magnetic head on the magnetic tube drawing device 5 approaches the tail part of the bracket of the ureteral stent during tube drawing operation, the magnetic head and the magnetic head are instantaneously magnetized by the magnetic field generated by the large magnetic head, become a magnet and are mutually attracted with the large magnetic head to form connection, so that the magnetic tube drawing is realized.

Fig. 2 is a front view of the ureteral stent of the present embodiment. The head part B and the tail part A of the bracket respectively refer to the renal pelvis end and the bladder end of the ureteral bracket, and the port of the head part of the bracket can be set to be an opening or a closed port. When the ureteral stent is implanted into a ureter of a human body, urine produced in a renal pelvis flows into a bladder through drainage holes at the tail part of the stent and a wire guide cavity in a passive suction head through drainage holes on the head part of the stent and a stent tube body 1-3 and then through an inner cavity of the stent tube body, and is finally discharged out of the body through a urethra. Because the bracket tail part of the ureteral bracket is provided with the passive suction head 2 and the secondary passive suction head, the inner cavity of the bracket tube body of the bracket is reduced to some extent, in order to ensure that the drainage effect is not influenced, the number of the drainage holes at the tail part of the bracket is 2-3 times of that of the drainage holes at the head part of the bracket, so that the drainage area of the bladder end is slightly larger than that of the renal pelvis end, and simultaneously, the pressure of liquid in the renal pelvis end is slightly larger than that of the liquid in the bladder end due to the action of gravity, so that the urine can be drained smoothly.

Fig. 3 is a front and rear sectional view of the tail of the stent. The secondary passive suction structure 3 is composed of a plurality of secondary passive suction heads which are distributed in an even interval array and are embedded and fixed in the support tube bodies 1-3 above the support tail 2/3, the outer diameters of the secondary passive suction heads are in interference fit with the inner cavities of the support tube bodies, and the secondary passive suction heads are wrapped by the support tube bodies because the support tube bodies are made of high-elastic materials, the outer diameters of the support tube bodies at the wrapping positions are 0.05-0.1mm larger than those of the support tube bodies at other positions, but the support tube bodies are made of soft plastic, and the final implantation of the support can not be influenced due to the slightly larger local size.

As can be seen from the combination of fig. 4 and 5, the secondary passive suction head has a through hole for guiding a guide wire, if necessary, the inner cavity structure can be guided by the corresponding guide wire during catheterization to facilitate catheterization, and urine can flow out from the cavity after implantation. The length of the secondary passive suction heads is 2-3mm, and the interval between the secondary passive suction heads is 3-6 mm. The uniformly spaced arrangement can ensure that the tail part of the bracket of the ureteral bracket keeps the original circular ring shape, meanwhile, the suction force formed by the magnetic attraction of the secondary passive suction structure and the magnetic suction tube drawing device is smaller than the drawing force of the ureteral bracket by controlling the length size of the secondary passive suction head, so that when a large magnetic head on the magnetic suction tube drawing device sucks any secondary passive suction head on the secondary passive suction structure to move backwards, the large magnetic head slips from the secondary passive suction head which is just sucked, slides to and quickly sucks the next secondary passive suction head, and sequentially slides to the tail end of the ureteral bracket and sucks the passive suction head at the tail end. It should be noted that, if the interval between the secondary passive suction heads is too large, the large magnetic head slips off the moment of the primary passive suction head when moving backward, and the large magnetic head cannot reach the next secondary passive suction head to be magnetized and cannot be sucked due to the limited magnetic attraction range of the large magnetic head on the magnetic suction tube drawing device, so that the magnetic suction tube drawing device is separated from the ureter bracket and cannot draw the tube smoothly at one time. Meanwhile, the tail part of the bracket cannot be shape-preserved due to too small interval design, and the original anti-moving capability of the bracket is lost. Generally speaking, the connection force between the magnetic suction tube drawing device and the secondary passive suction structure is set to be 0.5 to 1N, and the suction force between the magnetic suction tube drawing device and the passive suction head is greater than or equal to 1.5N.

Fig. 8 is a sectional view of the tail end of the ureteral stent of the present embodiment. As shown in fig. 9, the passive suction head is composed of a head end 2-1, a fastening section 2-2 and a back-off body 2-3 at the tail end, the outer diameter of the head end is consistent with that of the tail part of the stent, a guide wire cavity at the center is used for guiding a guide wire when the stent is placed in a tube, and urine can be guided out of the stent after the stent is implanted into a human body. The passive suction head is mutually fixed by the fastening ring 4 through increasing the friction force by gripping and pressing the flexible pipe body of the ureteral stent to form circumferential pressure. Meanwhile, the diameter of the holding and pressing part is consistent with the diameters of the ureteral stent tube body and the head end of the passive suction head. The length of the fastening section 2-2 is more than or equal to that of the fastening ring, the size of the back-off body at the tail end is slightly larger than that of the fastening section, the back-off body 2-3 is a raised step and can be triangular, quadrangular or circular, and the like, the fastening section and the back-off body form a stepped shaft type structure and form a stepped shaft hole type assembly form with the tail part of the bracket, and when the passive suction head is stressed by a large force, the back-off body is blocked by the fastening ring after being held and pressed, so that the slipping can be effectively prevented.

Example 2

Compared with example 1, fig. 6 and 7 show a schematic structure of another ureteral stent of the invention. The secondary passive suction structure 3 is composed of secondary passive suction rings distributed at regular intervals, the secondary passive suction rings are made of magnetic attraction type metal materials, the secondary passive suction rings are fixed on the surface of the bracket tube body of the bracket tail in a holding and pressing mode through a secondary passive suction ring holding and pressing tool shown in patent CN207085058U, and the bracket tail of the ureteral bracket with the secondary passive suction rings distributed at regular intervals can be kept in a ring shape through a hot melting shaping mode again. The length of the secondary passive suction ring is 2-3mm, the interval between the secondary passive suction rings is controlled between 2-4mm, and the single wall thickness of the secondary passive suction ring is 0.1-0.2 mm. Because the secondary passive suction ring is fixed on the tail part of the bracket through the holding and pressing tool, the outer diameter of the ureteral bracket cannot be increased, and the diameter of the inner cavity of the bracket tube cannot be basically changed.

Fig. 10a-10d are schematic views of the process of extracting the ureteral stent of the present invention. When the ureteral stent is implanted into a body, the head part of the ureteral stent is positioned in a renal pelvis, the tail part of the ureteral stent is positioned in a bladder, and the position of the tail part of the ureteral stent in the bladder is determined by the placement degree of a doctor during operation and possible movement after implantation (such as self gravity or self peristalsis of a ureter of a human body), so that the shape and the position of the ureteral stent in the bladder are variable, and the position of the ureteral stent during placement and before tube extraction can be different. When carrying out the extubation operation, doctor operation magnetism is inhaled extubation device 5 and is inserted the bladder along human urethra in, and the big magnetic head that is located 5 front ends of magnetism and inhales extubation device motion and back-and-forth movement or rotation in the bladder because of the operation person, when being close the support afterbody or when directly bumping on, attract head 2 passively and secondary passive attraction structure 3 is magnetized in the twinkling of an eye, and both interact, finally form the connection. Because the suction force formed by the magnetic attraction of the passive suction head and the magnetic tube drawing device is set to be more than or equal to the force required by the ureteral stent to be drawn out from the body, and the suction force formed by the magnetic attraction of the secondary passive suction structure and the magnetic tube drawing device 5 is set to be less than the drawing-out force of the ureteral stent. Meanwhile, the position of the ureteral stent cannot be known in advance relative to the large magnetic head, when the large magnetic head is close to the passive suction head at the tail end in a direct approaching mode, effective connection can be formed, the formed suction force is larger than or equal to the pulling force of the stent, and then the ureteral stent can be directly pulled out. However, the magnetic field formed by the large magnetic head around the large magnetic head is limited, and the large magnetic head and the passive suction head at the tail end of the ureteral stent cannot mutually attract and form connection once the distance between the large magnetic head and the passive suction head is too large. In practice, the magnetically attractable tube device will typically approach the tail of the stent at any location during movement after entering the bladder, rather than around the tail. The tail part of the whole ureteral stent is set into a large-size passive suction body by arranging the passive suction structure and the passive suction head at the tail end of the ureteral stent, which undoubtedly enlarges the magnetic suction space and range. At the moment, if the big magnetic head enters any position of the tail part of the ureteral stent close to the back of the bladder, the big magnetic head can suck any one secondary passive suction head on the secondary passive suction structure. When the large magnetic head on the magnetic suction tube drawing device sucks any one passive suction head on the secondary passive suction structure to move backwards, the large magnetic head slips from the passive suction head just sucked, and the bracket tube cannot move (it needs to be noted that if the magnetic attraction force of the two is larger than that of the bracket, the bracket can be folded at a narrow urethral opening in a bladder when the bracket moves, so that the bracket cannot be pulled out along the urethra, and the large magnetic head slips to and rapidly sucks the next passive suction head, thereby sequentially sliding to the tail end of the ureter bracket and finally sucking the passive suction head at the tail end to form stable connection, so that the ureter bracket can be pulled out. This will improve the disposable success rate that utilizes magnetism to inhale the tube drawing undoubtedly greatly, make whole tube drawing process more convenient and quick more, reduce the painful of repeated tube drawing for patient's cause simultaneously.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a magnetism is inhaled and is pulled out tubular ureteral stent, includes unanimous support body of integrated into one piece and external diameter, support head and support afterbody, equal interval is provided with a plurality of drainage holes on the support body of support body, support head and support afterbody all are the circulus, its characterized in that: the utility model discloses a support, including support afterbody circumference interval, support afterbody circumference interval is provided with a plurality of secondary passive attraction structures, secondary passive attraction structure is for fixed endotheca in the secondary passive attraction head of support afterbody or fixed overcoat in the secondary passive attraction ring of support afterbody, the through-hole has been seted up in the secondary passive attraction head, the end fixing of support afterbody is provided with passive attraction head, the interior wire guide chamber that has seted up of passive attraction head, secondary passive attraction ring and passive attraction head are made by soft magnetic metal material or magnetism metal material.

2. The magnetically-drawn tubular ureteral stent of claim 1, wherein: the passive suction head comprises a head end, a fastening section and an inverted buckle body which are integrally formed, the outer diameter of the head end is consistent with that of the tail part of the bracket, and the fastening section and the inverted buckle body form a stepped shaft type structure and form a stepped shaft hole type assembly form with the tail part of the bracket.

3. The magnetically-drawn tubular ureteral stent of claim 2, wherein: and a fastening ring is sleeved outside the position fixing sleeve corresponding to the fastening section at the tail part of the bracket.

4. The magnetically-drawn tubular ureteral stent of claim 3, wherein: and adjacent drainage holes are circumferentially staggered by 180 degrees.

5. The magnetically-drawn tubular ureteral stent according to claim 4, wherein: the quantity of the drainage holes at the tail part of the bracket is 2-3 times of that of the drainage holes at the head part of the bracket.

6. The magnetically-drawn tubular ureteral stent according to any of claims 1 to 5, wherein: the support body is provided with scale marks.

7. The magnetically-drawn tubular ureteral stent of claim 6, wherein: the secondary passive suction structure is a secondary passive suction head which is fixedly sleeved at the tail part of the bracket, the length of the secondary passive suction head is 2-3mm, and the interval between the adjacent secondary passive suction heads is 3-6 mm.

8. The magnetically-drawn tubular ureteral stent of claim 6, wherein: the secondary passive suction structure is a secondary passive suction ring which is fixedly sleeved on the tail of the bracket, the length of the secondary passive suction ring is 2-3mm, and the interval between adjacent secondary passive suction rings is 2-4 mm.