CN219501807U - Central tube of expander and telescopic expander with same - Google Patents

Abstract

The utility model discloses a central tube of an expander and a telescopic expander with the central tube. One end of the central tube is a head end. The center tube includes: the main pipe section, the end pipe section and the convergent section that set gradually along length direction, the tip that keeps away from the end pipe section of convergent section is the head end, and in the direction towards the head end, the diameter of convergent section reduces gradually, and the length of convergent section is greater than the maximum diameter of convergent section. Wherein the main tube section is for sheathing and guiding a second tube of the expander, and the stop tube section is configured to be able to stop against an end of the second tube. According to the central tube of the dilator, the central tube has the functions of direct expansion and blocking and positioning of the subsequent second tube when in use, and the subsequent dilator tube body can be sleeved in sequence so as to complete channel establishment.

Description

Central tube of expander and telescopic expander with same

Technical Field

The utility model relates to the field of medical equipment, in particular to a central tube of an expander and a telescopic expander with the central tube.

Background

The dilator is a common operation instrument for treating operations such as stones in medicine, and the elongate pipeline of the dilator is utilized to dilate the channel, and then medicines, guide wires, sight glasses and the like are placed in the channel. How to further reduce the damage of the operation to the body when using the dilator for the operation is an important subject of the research of the application field of the dilator.

Taking urinary lithiasis as an example, urinary lithiasis is a common disease and frequently encountered disease in China, the incidence rate is about 2-3%, the urinary lithiasis can account for more than 40% of patients in urinary surgery in high incidence areas, and the main hazard of the urinary lithiasis is kidney function injury caused by lithiasis. PCNL (percutaneous nephrolithotripsy) is a milestone for the treatment of urinary stones and is an important component of minimally invasive urology surgery. The technology has the characteristics of small wound and high calculus removal rate, and has become a gold standard for treating complex urinary tract calculus (deer-horn-shaped kidney calculus, multiple kidney calculus and the like). PCNL mode is to enter a kidney collecting system through percutaneous puncture guided by imaging positioning, further expand and establish a percutaneous kidney channel, and then use a nephroscope combined lithotripsy tool (ultrasonic, pneumatic trajectory and the like), and enter the kidney collecting system through the percutaneous kidney channel to carry out lithotripsy and stone extraction. Wherein the passage from the skin to the kidney is expanded from small to large with a dilator until a passage with a diameter of about 5-8mm (16-24 Fr) is formed as the operative tunnel for the surgery. The expansion and establishment of the channel have high technical difficulty and are also key to easily generating the surgical complications.

At present, the establishment channel commonly used at home and abroad has the following two methods.

(1) A step-by-step expansion method of fascia expander. The method is to expand the micro-channel step by step from 8Fr, 10Fr, 12Fr, 14Fr and 16Fr by using a set of polyethylene expanders (fascia expanders), or to add expanders to 24Fr standard channels. The channel size is selected according to the specific circumstances of the operation. Each dilator is expanded into the kidney along the guide wire, then taken out, and then placed into a second dilator for continuous expansion until the last dilator. The difficulty and problem of this method is that it is necessary to ensure that the expansion can be performed into the renal calyx (the collecting system) each time, and it is difficult for beginners to grasp the expansion depth each time, because each operation causes slight displacement of the kidney, so that the expansion depth is not completely the same, the measurement of the previous length is not accurate, and more time, the experience and hand feeling of the doctor are required to grasp the depth, thus easily causing too deep expansion to damage the kidney and bleeding or too shallow to lose the channel.

(2) Telescopic expansion of metal dilators. The method is to use a set of metal telescopic expanders to be overlapped and nested layer by layer so as to expand the skin and kidney channels to the required size. The central long probe rod is 6Fr, 6 short hollow intussusception dilators of 9Fr, 12Fr, 15Fr, 18Fr, 21Fr and 24Fr are arranged at the back of the probe rod to intussuscept one by one, each expander is arranged in the front of the probe rod to remain in place, and then the probe rod is arranged at the back of the probe rod to intussuscept one by one. The disadvantage and problem with this approach is that because the head end of the first central probe (dilator) is a rounded, enlarged blunt tip, which is only used to block and secure the latter dilator, it cannot be directly expanded as a fascia dilator, requiring the combination of (1) a dilator as the second part. But has the advantage of ensuring that the depth of expansion is relatively stable and generally not too deep or too shallow.

How to further improve the telescopic expander structure, enhance the expansion effect, and even the operation does not need to combine with the expander (1), is the research direction of the scheme of the utility model.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a central tube of an expander and a telescopic expander with the central tube.

According to the central tube of the expander, one end of the central tube is a head end. The center tube includes: the main pipe section, the end pipe section and the convergent section that set gradually along length direction, the convergent section keep away from end pipe section be the head end, in the orientation of head end, the diameter of convergent section reduces gradually, the length of convergent section is greater than the maximum diameter of convergent section.

Wherein the main tube section is for sheathing and guiding a second tube of the expander, and the stop tube section is configured to be able to stop against an end of the second tube.

According to the central tube of the dilator, the central tube has the functions of direct expansion and blocking and positioning of the subsequent second tube when in use, and the subsequent dilator tube body can be sleeved in sequence so as to complete channel establishment. The technique is equivalent to mutually fusing the advantages of the two existing dilators to eliminate the short plate, can greatly reduce the damage caused by too deep or lost passage, greatly improves the operation safety, reduces the learning difficulty, and has the significance of milestones. For example, when the skin-kidney channel is established, the central tube is beneficial to obtaining the relatively stable expansion depth of the kidney, thereby avoiding serious complications such as kidney injury, hemorrhage and the like caused by channel loss and over-deep.

In some embodiments, the outer circumferential surface of the stopper segment is a tapered or stepped surface.

Specifically, the outer circumferential surfaces of the tapered section and the stop section are tapered surfaces, and the maximum outer diameter of the stop section is equal to the maximum outer diameter of the tapered section.

Specifically, at least one of the outer peripheral surface of the tapered section and the outer peripheral surface of the stopper section is a frosted surface.

Specifically, the outer peripheral surface of the main pipe section is in smooth transition connection with the outer peripheral surface of the stop pipe section.

In some embodiments, the center tube has a center bore comprising: a main bore section and a small bore section, the small Kong Duanwei being at an end of the main bore section facing the head end, the small bore section being smaller in diameter than the main bore section.

In some embodiments, the stop segment length is 1.5-3 times the tapered segment length.

A telescopic dilator according to an embodiment of the present utility model comprises: the central tube is the central tube of the expander in the embodiment; and the second pipe is sleeved on the main pipe section of the central pipe, and the end part of the second pipe can be stopped on the pipe stopping section.

According to the telescopic expander disclosed by the embodiment of the utility model, the function of expanding the central tube and positioning the second tube is utilized, so that the telescopic expander is higher in practicability and safety.

In particular, the end of the second tube for stopping the stop tube section is formed as a constriction.

Further, the telescopic dilator further comprises at least one third tube sleeved on the second tube, and the third tubes are sequentially sleeved in a stacked mode when the third tubes are multiple.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a major side view of a center tube of one embodiment;

FIG. 2 is a cross-sectional view of the center tube shown in FIG. 1;

FIG. 3 is a major side view of a center tube of another embodiment;

figure 4 is a front view of a telescopic dilator of one embodiment;

figure 5 is an exploded view of another embodiment telescopic dilator.

Reference numerals:

telescopic dilator 100,

A central tube 10, a head end P, a tail end Q,

A main pipe section 1, a stop pipe section 2, a tapered section 3,

A central hole a, a main hole section a1, a small hole section a2,

A second pipe 20, a necking 21,

A third tube 30, a first outer sleeve 31, a second outer sleeve 32.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "length," "width," "thickness," "inner," "outer," "axial," "radial," "circumferential," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The center tube 10 of the expander according to an embodiment of the present utility model is described below with reference to the accompanying drawings, on the basis of which a telescopic expander 100 having the center tube 10 described above is described.

The central tube 10 of the expander according to an embodiment of the present utility model, as shown in fig. 1, the central tube 10 is an elongated tube body, and for convenience of description, one end of the central tube 10 is referred to herein as a head end P, and the other end of the central tube 10 is referred to as a tail end Q.

As shown in fig. 1 to 3, the center tube 10 includes: the main pipe section 1, the stop pipe section 2 and the tapered section 3 are sequentially arranged along the length direction, the end part, far away from the stop pipe section 2, of the tapered section 3 is a head end P, and the diameter of the tapered section 3 is gradually reduced in the direction towards the head end P.

That is, the outer profile of the cross section of the tapered section 3 is circular, which is convenient to process, and the tapered section 3 has less influence on the hydraulic environment around the pipe when the central pipe 10 rotates.

The cross section of a tube section is referred to herein as the cross section of the tube section perpendicular to the length of the center tube 10. Here, the generatrix of the tapered section 3 may be a straight line section, an arc line, or a polyline, which is not limited herein. The length m3 of the tapered section 3 is larger than the maximum diameter d2 of the tapered section 3, the tapered section 3 is shaped like a pointed cone, the head end P is positioned at the tip end of the pointed cone, the flow resistance is small when the tapered section is inserted forwards, and the outer peripheral surface of the tapered section 3 can gradually squeeze liquid to the radial outer end. The tapered section 3 of this configuration facilitates the gradual expansion of the passageway.

Wherein the main tube section 1 serves for sheathing and guiding the second tube 20 of the expander, and the tube stop section 2 is configured to be able to stop against the end of the second tube 20.

In use, the central tube 10 extends from the head end P to the destination of the body duct, with less resistance to flow when the head end P is inserted forward. After the central tube 10 is in place, the second tube 20 is slid along the central tube 10 and also extends to the destination of the machine body pipeline, so that the purpose of establishing a channel is achieved. Since the diameter of the tapered section 3 gradually decreases in the direction toward the head end P, the tapered section 3 is shaped like a pointed cone, so that the tapered section 3 itself has an expanding function. By the arrangement of the pipe stop section 2, the second pipe 20 can be positioned, and the damage to the body caused by the second pipe 20 being inserted too deeply can be prevented.

According to the central tube 10 of the dilator, the central tube 10 has the functions of direct expansion and blocking and positioning of a subsequent second tube when in use, and the subsequent dilator tube body can be sleeved in sequence to complete channel establishment. The technique is equivalent to mutually fusing the advantages of the two existing dilators to eliminate the short plate, can greatly reduce the damage caused by too deep or lost passage, greatly improves the operation safety, reduces the learning difficulty, and has the significance of milestones. For example, when establishing a percutaneous renal channel, it is advantageous to use such a central tube 10 to achieve a relatively stable expansion depth of the kidney, thereby avoiding serious complications such as kidney injury and bleeding due to lost and too deep a channel.

In particular, the central tube 10 of the present utility model may be a metal tube, although other materials are not excluded from the present utility model.

In some embodiments, the outer cross-sectional profile of the stopper segment 2 is circular, which further facilitates processing, and the stopper segment 2 has less impact on the hydraulic environment surrounding the pipe when rotation of the center tube 10 occurs.

Specifically, the outer diameter of the pipe stop section 2 gradually increases in the direction towards the tapered section 3, the shape of the pipe stop section 2 is simpler, and the surface of the pipe stop section 2 is favorably polished by using automatic equipment such as a lathe.

In some embodiments, the cross-sectional outer profile of the tapered section 3 is circular and the cross-sectional outer profile of the stopper section 2 is circular, the maximum outer diameter of the stopper section 2 being equal to the maximum outer diameter of the tapered section 3. Therefore, the device is attractive in appearance and easy to process, when the central pipe stretches into a machine body pipeline, the connection part of the tapered section 3 and the stop pipe section 2 has a smooth influence on surrounding hydraulic pressure, and the probability of local hydraulic abrupt change is reduced.

Of course, the shape of the stopper pipe section 2 according to the present utility model is not limited thereto, and for example, in fig. 3, the outer peripheral surface of the stopper pipe section 2 may be formed into a stepped surface, and although the difficulty in surface processing increases when the stepped surface, the positioning effect is more remarkable when the second pipe 20 is stopped against the step.

Specifically, the outer peripheral surface of the tapered section 3 may be a frosted surface, and when ultrasonic monitoring is adopted in the operation, the visual effect under the ultrasonic monitoring can be increased, and the expansion depth of the first root of the expander is ensured under the ultrasonic monitoring.

In some embodiments, the outer peripheral surface of the stop tube section 2 is also formed into a frosted surface, so that the visual effect under the ultrasonic monitoring can be enhanced.

Or the outer peripheral surface of the tapered section 3 and the outer peripheral surface of the pipe stop section 2 are frosted surfaces.

Specifically, the outer peripheral surface of the main pipe section 1 is in smooth transition connection with the outer peripheral surface of the stop pipe section 2, the connection part of the main pipe section 1 and the stop pipe section has smoother influence on the surrounding hydraulic pressure, and the probability of local hydraulic abrupt change is reduced.

In some embodiments, as shown in fig. 2, the center tube 10 has a center hole a, the center hole a including: a main hole section a1 and a small hole section a2, wherein the small hole section a2 is positioned at one end of the main hole section a1 facing the head end P, and the diameter of the small hole section a2 is smaller than that of the main hole section a 1. Thus, when the medicament or guide wire or sight glass is moved along the central tube 10 to the destination, the medicament or guide wire or sight glass firstly moves in the larger main hole section a1, and the advanced resistance can be reduced due to the larger diameter of the main hole section a 1. The accuracy of delivery or control can be improved by utilizing smaller small hole segments a2 when adjacent to the destination.

Specifically, the taper hole section is connected between the main hole section a1 and the small hole section a2, so that smoothness when entering the small hole section a2 can be improved.

In some embodiments of the present utility model, as shown in fig. 1, the main pipe section 1 has an outer diameter d1 and a length m1. One end of the stop tube section 2 has an outer diameter d1, the other end has an outer diameter d2 and the length is m2. The tapered section 3 has one end with a maximum diameter d2 and a length m3. The parameters can be set according to actual needs.

It should be noted that the drawings of the present embodiment are to be understood as examples only, and the dimensional proportion of the length and the diameter of each tube section 1 of the central tube 10 is not limited by the drawings.

In some alternative embodiments, the length of the stop tube section 2 is 2-3 times the length of the tapered section 3, whereby the tapered section 3 is shorter and the penetration depth of the dilator can be accurately obtained by the tapered section 3. The tapered section 3 is set longer to avoid too much stress concentration on the center tube 10.

In an alternative embodiment, the tapered section 3 of the central tube 10 is a cone, with a length m3 of 0.5cm and a circumference of 11.5 Fr-3 Fr. The stop tube section 2 is a conical cylinder, the length m2 is 1.5cm, and the circumference is 11.5 Fr-9 Fr. The main pipe section 1 is a cylinder, the length m1 is 38cm, and the circumference is 9Fr. The central tube 10 is of hollow design and the central bore a has a diameter of 1.2mm.

A telescopic dilator 100 according to an embodiment of the present utility model is described with reference to the accompanying drawings.

A telescopic dilator 100 according to an embodiment of the present utility model, as shown in fig. 4 and 5, includes: the central tube 10 is the central tube 10 of the expander of the above embodiment, and the structure of the central tube 10 is not described herein. The second tube 20 is fitted over the main tube section 1 of the central tube 10, and the end of the second tube 20 can be stopped against the stop tube section 2.

The telescopic expander 100 according to the embodiment of the present utility model makes the telescopic expander 100 more practical and safe by utilizing the function of the central tube 10 to expand and position the second tube 20.

Specifically, the end of the second tube 20 for stopping the tube section 2 is formed as a constriction 21. By means of the arrangement of the shrinkage 21, after the end part of the second pipe 20 is stopped on the stop pipe section 2, the shrinkage 21 of the second pipe 20 is overlapped with the tapered section 3 along the length direction, and the expansion effect can be achieved.

Further, the telescopic dilator 100 further comprises at least one third tube 30, the third tube 30 is sleeved on the second tube 20, and when the third tubes 30 are a plurality, the third tubes are sequentially sleeved in a stacked manner. The placement of third tube 30 may enhance the expansion of telescopic dilator 100, allowing the passage to be gradually enlarged to the desired size.

In fig. 4 and 5, the number of the third tubes 30 is two, one of which is a first outer sleeve 31 fitted over the second tube 20, and the other is a second outer sleeve 32 fitted over the first outer sleeve 31, although the number of the third tubes 30 may be more.

Alternatively, the orifice of the third tube 30 adjacent the head end P may be configured to constrict, which may also augment the channel expansion effect.

Of course, the structure and size of the third tube 30 in the present utility model may be the same as those of the prior art, which is not limited thereto.

In one embodiment, the prior art telescopic dilator and the telescopic dilator 100 of the present utility model are described below.

The sizes of the prior art original metal dilators are respectively from thin to thick: 6Fr, 9Fr, 12Fr, 15Fr, 18Fr, 21Fr, 24Fr. The innermost one of the dilators is the first one, the first one is a central rod, the length of the central rod is 45cm, the diameter of the central rod is 6Fr, the head end of the central rod expands to 9Fr, and the central rod is blocked and fixed. The second tube of the expander has a length of 20cm, the head end is reduced in size (diameter is the same as that of the previous tube), the tail end is slightly rolled inwards, and the second tube is embedded and fixed with the tail end of the previous expander.

The central tube 10 of the telescopic dilator 100 of the present utility model has an outer diameter of 3mm (9 Fr), an inner diameter of 1.2mm (3.6 Fr) and a length of 380mm for the main tube section 1. The central tube 10 is divided into two parts, wherein the outer part Zhou Quanceng is a frosted surface, the total length is 20mm, the tapered section 3 is a cone, the length is 5mm, the inner diameter is 1.2mm (3.6 Fr), the length of the stop tube section 2 is 15mm, the outer diameter is 3.5mm (10.5 Fr), and the tail side is in consistent smooth connection with the main body. Functional aspects: 1. the device is used as a root expander; 2. the stop tube section 2 stops the fixed second tube 20;3. the handle is used as an inner core fixing handle.

Specification of the second tube 20: 230mm in length, 3.5mm/10.5Fr in inner diameter and 4mm/12Fr in outer diameter.

The third tube 30 is 3 rd to 5 th, is identical to the original dilator and has no change. The outer diameters are respectively 5mm/15Fr, 6mm/18Fr and 7mm/21Fr, and the tail end inner coils are used for being sequentially sleeved and fixed.

In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A central tube of an expander, wherein one end of the central tube is a head end;

the center tube includes: the device comprises a main pipe section, a stop pipe section and a tapered section which are sequentially arranged along the length direction, wherein the end part of the tapered section, which is far away from the stop pipe section, is the head end, the diameter of the tapered section gradually decreases in the direction towards the head end, and the length of the tapered section is larger than the maximum diameter of the tapered section;

wherein the main tube section is for sheathing and guiding a second tube of the expander, and the stop tube section is configured to be able to stop against an end of the second tube.

2. A central tube of a dilator according to claim 1, wherein the outer circumferential surface of the stopper tube section is a tapered surface or a stepped surface.

3. The center tube of the expander of claim 2, wherein the outer peripheral surfaces of the tapered section and the stop section are tapered surfaces, and the maximum outer diameter of the stop section is equal to the maximum outer diameter of the tapered section.

4. The center tube of the expander of claim 1, wherein at least one of the outer peripheral surface of the tapered section and the outer peripheral surface of the stopper section is frosted.

5. The center tube of the expander of claim 1, wherein the outer peripheral surface of the main tube section is in smooth transition with the outer peripheral surface of the stopper tube section.

6. A central tube of a dilator according to any one of claims 1-5, wherein the central tube has a central bore comprising: a main bore section and a small bore section, the small Kong Duanwei being at an end of the main bore section facing the head end, the small bore section being smaller in diameter than the main bore section.

7. A central tube of a dilator according to any one of claims 1-5, wherein the stopper tube section length is 1.5-3 times the tapered section length.

8. A telescopic dilator, comprising:

a central tube, which is a central tube of the dilator according to any one of claims 1-7;

and the second pipe is sleeved on the main pipe section of the central pipe, and the end part of the second pipe can be stopped on the pipe stopping section.

9. The telescopic expander according to claim 8, wherein the end of the second tube for stopping the stop tube section is formed as a constriction.

10. A telescopic expander according to claim 8 or claim 9, further comprising at least one third tube sleeved over the second tube, the third tubes being stacked in sequence when there are a plurality of third tubes.