CN212592350U - Puncture outfit - Google Patents

Abstract

The utility model relates to a puncture outfit, which comprises an external component, a puncture outfit and a puncture outfit, wherein the external component is used for limiting a longitudinal axis and is provided with an external peripheral wall; an inner member at least partially disposed within the outer member, the inner member including a perforated member adjacent the outer member distal end; the inner member being movable in a longitudinal direction relative to the outer member and enabling penetration through tissue in a state in which the piercing member is at least partially exposed from the peripheral wall; the internals is when the relative internals is removed in the direction of keeping away from the internals distal end, and the deformation along radial outside expansion can take place for the moving part at least local to realize strutting of elastic membrane, compare with prior art, the utility model has the advantages of the deformation along radial outside expansion takes place for the moving part at least local to realize strutting of elastic membrane, thereby form similar "gasbag or sacculus" structure, thereby play and fix the effect on patient's body wall with the puncture ware.

Description

Puncture outfit

Technical Field

The present invention relates to a surgical instrument for minimally invasive surgery, such as endoscopic or laparoscopic surgery, and more particularly to a puncture device suitable for laparoscopic transgastric surgery.

Background

Laparoscopic surgery is currently the most widely used minimally invasive surgical procedure in clinical practice. In the operation, a laparoscope puncture outfit is used to puncture the body wall (chest, abdomen, waist and other parts) of a human body through the skin, the front end of a sheath tube of the puncture outfit is kept in the body cavities of an abdominal cavity, a thoracic cavity or a posterior abdominal cavity and the like, and then a surgical instrument is placed in a channel in the puncture sheath tube to carry out corresponding operation on the tissues and organs in the body cavities. The laparoscope puncture outfit is an instrument which must be used in the operation, the prior laparoscope puncture outfit has no effective fixing device after the sheath tube is punctured into a body cavity, and the puncture sheath tube is often separated from the body and goes deep into the body in the operation process. The puncture outfit sheath is placed too deeply, so that the risk of damaging visceral organs is caused, the visual field of an endoscope can be shielded, and the operation of surgical instruments is difficult, such as various forceps, clamps, ultrasonic knife heads, needle holders and the like can not be opened; the puncture outfit sheath tube is frequently taken out, so that an operator has to repeatedly puncture and place the cannula, the operation progress and quality are seriously influenced, and the trauma of a patient is aggravated. In addition, in laparoscopic surgery, carbon dioxide gas is required to be filled into the body cavity of a human body to expand the body cavity so as to facilitate the operation of surgical instruments. As a large gap can exist between the sheath tube of the puncture outfit currently used and the body wall puncture channel, the leakage of gas in the cavity is easy to cause. The body cavity is decompressed and collapsed due to a large amount of gas leakage, and the operation is seriously disturbed; the overflowed gas enters the subcutaneous loose fat tissue gap to form extensive subcutaneous emphysema, which increases the pain of the patient.

Therefore, the present balloon puncture outfit which is more clinically applied, for example, a Chinese utility model patent with patent number ZL201620244650.5 (No. CN205649532U) balloon puncture outfit or a Chinese utility model patent with patent number ZL201520312345.0 (No. CN204765824U) puncture outfit with balloon fixing discloses a puncture outfit which comprises a puncture sleeve and a puncture rod arranged in the puncture sleeve, the puncture sleeve comprises a tubular hard sleeve body, one end of the hard sleeve body is provided with a sleeve seat for the puncture rod to pass through, the circumferential outer side of the hard sleeve body is provided with at least one diversion trench, a soft film covering sleeve body which is made of soft materials and can seal the notch of the diversion trench to form a diversion channel is sleeved on the outer side of the circumference of the hard sleeve body, and one end of the diversion channel is communicated with a one-way valve arranged at one end of the hard sleeve body, and the other end of the diversion channel is communicated with an annular balloon which is positioned at the circumferential outer side of the other end of the hard sleeve body and is formed by the circumferential outward bulge of the end part of the soft film covering sleeve body. In addition, in clinical practice, the balloon puncture outfit is also used in laparoscopic transgastric cavity surgery, and the balloon puncture outfit is directly punctured into the gastric cavity through the abdominal wall in the laparoscopic transgastric cavity surgery, on one hand, the puncture outfit with the air bag is needed, the cost is high, and the popularization is unchanged; meanwhile, in order to inflate the air bag, an inflation pipeline needs to be reserved on the tube wall, the tube wall thickness needs to be increased, and the diameter of the puncture outfit is increased, so that the damage to the abdominal wall and the stomach wall is increased during puncture, and the tube wall is thick and cannot be made of transparent materials, so that the operation visual field is influenced, the operation risk is increased, and the air bag is not popularized at present; on the other hand, after the stomach cavity is inflated, partial gas is bound to flow into the intestinal tract, abdominal distension is caused to a postoperative patient, the recovery of the intestinal tract function of the patient is not facilitated, and after the partial gas overflows from the oral cavity, the operation space in the stomach cavity is affected, and the exposure and the operation of a focus are not facilitated; meanwhile, in the process of cutting off the lump on the stomach wall, the stomach wall is cut through, so that gas in the stomach cavity overflows into the abdominal cavity, the maintenance of the operation of the stomach cavity is influenced, more importantly, gastric juice and tumor pollute the abdominal cavity, and the basic principle of surgical sterility and tumor-free is violated. For this reason, a puncture instrument dedicated to the laparoscopic transgastric cavity operation, which is inflatable without puncture of the gastric cavity, has become obviously necessary.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a puncture outfit for gastric cavity operation by reducing the suction of pneumoperitoneum gas as much as possible in view of the current situation of the prior art.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: this puncture ware, including:

an outer member defining a longitudinal axis and having an outer peripheral wall;

an inner member including a piercing member adjacent a distal end of the outer member, the inner member being movable in a longitudinal direction relative to the outer member and enabling penetration through tissue in a state in which the piercing member is at least partially exposed from the peripheral wall;

the method is characterized in that: also includes:

and the movable piece is provided with at least one peripheral wall arranged on the outer member and can move away from the perforated member under the actuation of the inner member, so that the movable piece can be deformed at least partially and outwards along the radial direction.

In order to better accommodate gastric cavity surgery, the moveable members preferably include two, a first moveable member for accessing the gastric cavity and a second moveable member for accessing the abdominal cavity, with an engagement portion engageable with the stomach wall between the first and second moveable members. When the perforation component passes through the body wall of the patient and punctures the stomach wall, because the moving part has two, get into the stomach chamber when first moving part, strut through the actuation of internals, pull the stomach wall to the body wall of the patient under the effect of strutting of first moving part simultaneously, the second moving part struts under the actuation once more of internals in addition, pull out behind the internals at last, can operate in the operation instrument in the internals, the hidden danger that the operation of inflating in the stomach chamber brought has been avoided, avoid puncture ware in the operation process often appear deviate from the external and go deep in vivo the condition emergence. After the operation is finished, the first movable piece and the second movable piece are folded back by means of the internal component, and the specific operation is opposite to the operation of opening the first movable piece and the second movable piece.

From the viewpoint of simple structure, preferably, the engaging portion is a thread, and the outer peripheral wall of the external member is further provided with a holding member capable of moving relative to the movable member, and the holding member and the expanded movable member together form a holding space for holding the abdominal wall of the patient. And the external component can be more stably fixed on the abdominal wall of the patient through the arrangement of the abutting piece, so that the puncture outfit is prevented from being frequently separated from the body and penetrating into the body in the operation process.

Further, the movable member has a movable foot capable of extending into the outer peripheral wall, the inner member has an actuating portion, the actuating portion has a socket into which the movable foot can be inserted, and in a state where the movable foot of the movable member is inserted into the socket of the actuating portion, when the inner member is moved relative to the outer member in a direction away from the distal end of the outer member, the movable member is capable of being deformed so as to expand radially outward at least partially. When the inner member for puncture moves relative to the outer member in the direction far away from the far end of the outer member, the movable member can be at least partially deformed by expanding outwards along the radial direction, so that the expansion of the elastic membrane is realized, a structure similar to an airbag or a balloon is formed, the effect of fixing the puncture outfit on the body wall of a patient is achieved, the operation of filling gas or liquid is omitted, the use is more convenient, and the manufacturing cost and the use cost are lower.

Furthermore, the peripheral wall of the external member is provided with a limiting notch for limiting the moving path of the movable foot of the movable member, the internal member can deflect circumferentially when moving relative to the external member in the direction away from the far end of the external member, and the movable member can be deformed to expand outwards along the radial direction at least partially under the actuation of the deflection force. When the inner member is moved in a longitudinal direction relative to the outer member to expose the piercing member (defined as the forward direction of the inner member), the puncture is made through the body wall of the patient, and then when the inner member is moved in a backward direction (i.e., the inner member is moved in a direction away from the distal end of the outer member relative to the outer member), the socket of the actuating portion of the inner member and the movable foot capable of driving the movable member are deformed to expand radially outward, and the actuation of the deflecting force is configured to cause a "turn" of the inner member to expand the elastic membrane, and a "turn" of the inner member is reversed to withdraw the inner member from the outer member, so as to facilitate the operation using the surgical instrument inserted into the outer member.

Furthermore, the limiting notch comprises a first notch parallel to the longitudinal axis direction of the outer member and a second notch perpendicular to the longitudinal axis direction of the outer member, and the first notch is communicated with the second notch; the movable foot of the movable member is movable from the first notch into the second notch in a state in which the inner member is capable of deflecting itself circumferentially when moving relative to the outer member in a direction away from the distal end of the outer member. The movable foot of the movable piece moves from the first notch to the second notch, so that the inner component rotates to stretch the elastic membrane.

Further, the movable member includes at least two sub-movable members surrounding a circle along the outer peripheral wall of the external member, each sub-movable member includes a fixed portion adjacent to the distal end of the external member and a free portion away from the distal end of the external member, the movable member further includes a movable ring for connecting the fixed portions of the sub-movable members together, correspondingly, the movable ring has a first annular groove for connecting the fixed portions of the sub-movable members together, each sub-movable member includes a corresponding movable leg connected to the movable ring, and the movable leg of each sub-movable member has an inclined surface deflecting along the circumferential direction. The movable pin of each sub-movable part is provided with an inclined surface which deflects along the circumferential direction, and can better move from the first gap to the second gap.

Furthermore, the outer peripheral wall of the external member further comprises a limiting ring adjacent to the free portion of each sub-moving member, and the free portion of each sub-moving member abuts against the limiting ring, so that the internal member can drive each sub-moving member to deform along the radial direction and expand outwards by applying force to the free portion of each sub-moving member through the limiting ring.

Furthermore, the outer peripheral wall of the external member further comprises a limiting ring adjacent to the free portion of each sub-moving member, and the free portion of each sub-moving member abuts against the limiting ring, so that the internal member can drive each sub-moving member to deform along the radial direction and expand outwards by applying force to the free portion of each sub-moving member through the limiting ring.

In order to realize the expansion of the elastic membrane, preferably, the periphery of the movable member is coated with the elastic membrane, the elastic membrane is expanded in a state that the movable member is at least partially deformed in a radially outward expansion manner, the distal end of the limiting ring away from the external member is provided with a second annular groove, the proximal end of the movable ring close to the external member is provided with a third annular groove, and two peripheral edge portions of the elastic membrane are respectively connected to the second annular groove and the third annular groove.

Compared with the prior art, the utility model has the advantages of when the internal member through being used for the puncture is removed in the direction of keeping away from the external member distal end at relative external member, can make the at least local deformation that takes place along radial outside expansion of moving part, thereby realize strutting of elastic membrane, thereby form the structure of similar "gasbag or sacculus", thereby play and fix the effect on patient's body wall with the puncture ware, omitted the operation that needs fill gas or liquid, it is more convenient to use, and it is lower to make and use cost.

Drawings

FIG. 1 is a schematic structural view of a puncture outfit for gastric cavity operation (with two elastic membranes) according to an embodiment of the present invention;

FIG. 2 is a schematic view of the moveable member of FIG. 1 in an at least partially radially outwardly expanding deformed state as it moves relative to the outer member in a direction away from the distal end of the outer member;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a partial schematic view of an outer member according to an embodiment of the present invention;

FIG. 5 is an exploded view of FIG. 1;

FIG. 6 is a schematic view of the partially exploded structure of FIG. 2;

FIG. 7 is a partially exploded view of FIG. 1 (showing the movable leg of the movable member in a position in the first notch when the perforated member is at least partially exposed from the peripheral wall);

FIG. 8 is a partially exploded view of the movable member of FIG. 2 (showing the movable foot of the movable member disposed in the second notch when the movable member is in a deformed configuration in which it is at least partially expanded radially outward);

FIG. 9 is the cross-sectional view of FIG. 1 (showing the movable foot of each of the child movers in a position to enter the second socket of the inner member when the inner member itself is circumferentially deflected);

FIG. 10 is a cross-sectional view of the outer member of FIG. 3 (showing the moveable foot of the moveable member in a state moving from the first notch into the second notch when the inner member is capable of circumferentially deflecting itself when moving relative to the outer member in a direction away from the distal end of the outer member).

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in FIGS. 1 to 10, the preferred embodiment of the present invention is shown. The puncture instrument of the present embodiment includes an outer member 1 for defining a longitudinal axis and having an outer peripheral wall 11; and an inner member 2 comprising a piercing member 21 adjacent the distal end 10 of the outer member 1, the inner member 2 being at least partially disposed within the outer member 1, the inner member 2 being movable in a longitudinal direction relative to the outer member 1 and enabling penetration through tissue in a state in which the piercing member 21 is at least partially exposed from the peripheral wall 11; at least one movable element 3 is also included, the movable element 3 being arranged on the peripheral wall 11 of the outer element 1, the movable element 3 being capable of moving away from the perforated element 21 upon actuation of the inner element 2, so as to realize a deformation in which the movable element 3 is capable of expanding radially outwards at least in sections.

Specifically, the two movable members 3 are a first movable member 3 'entering the stomach cavity and a second movable member 3 "entering the abdominal cavity, respectively, a joint portion 111 capable of being joined with the stomach wall is arranged between the first movable member 3' and the second movable member 3", the joint portion 111 of the embodiment is a screw thread, the peripheral wall 11 of the external member 1 is further provided with a holding member 4 capable of moving relative to the movable member 3, and the holding member 4 and the spread movable member 3 together form a clamping space for clamping the abdominal wall of the patient. Wherein the first moving part 3 'and the second moving part 3' are both provided with a moving foot 31 which can extend into the peripheral wall 11; and an actuating portion 22 disposed on an outer surface of the inner member 2 and having a socket 221 into which the movable leg 31 can be inserted, and an elastic membrane 6 for covering the movable member 3, wherein in a state where the movable leg 31 of the movable member 3 is inserted into the socket 221 of the actuating portion 22, when the inner member 2 moves relative to the outer member 1 in a direction away from the distal end 10 of the outer member 1, the movable member 3 can be deformed to expand radially outward at least partially, thereby expanding the elastic membrane 6. When the inner member 2 for puncture moves relative to the outer member 1 in the direction away from the far end 10 of the outer member 1, the movable member 3 can be at least partially deformed by expanding outwards along the radial direction, so that the elastic membrane 6 is stretched, a structure similar to an airbag or a saccule is formed, the puncture device is fixed on the body wall of a patient, the operation of filling gas or liquid is omitted, and the puncture device is more convenient to use.

In particular, in order to better achieve the expansion of the elastic membrane 6, the peripheral wall 11 of the outer element 1 is provided with a stop notch 112 that limits the path of movement of the mobile foot 31 of the mobile element 3, the inner element 2 being itself deflected circumferentially when it moves relative to the outer element 1 in a direction away from the distal end 10 of the outer element 1, under the actuation of this deflection force, so that the mobile element 3 is deformed at least partially so as to expand radially outwards. When the inner member 2 is moved in the longitudinal direction relative to the outer member 1 to expose the piercing member 21 (defined as the forward direction of the inner member 2), the puncture is performed through the body wall of the patient, and then when the inner member 2 is moved in the backward direction (i.e., when the inner member 2 is moved in the direction away from the distal end 10 of the outer member 1 relative to the outer member 1), the socket 221 of the actuating portion 22 of the inner member 2 and the movable leg 31 of the movable member 3 are deformed to expand radially outward, and the actuation of the deflecting force is configured to form a "turn" of the inner member 2 to expand the elastic membrane 6, and a "turn" of the inner member 2 is reversed to withdraw the inner member 2 from the outer member 1, so as to perform the operation using the operation instrument inserted into the outer member 1. The limiting notch 112 comprises a first notch 112a parallel to the longitudinal axis direction of the external member 1 and a second notch 112b perpendicular to the longitudinal axis direction of the external member 1, and the first notch 112a is communicated with the second notch 112 b; the movable leg 31 of the movable element 3 can move from the first notch 112a into the second notch 112b in a state in which the inner member 2 can itself deflect circumferentially when moving relative to the outer member 1 in a direction away from the distal end 10 of the outer member 1. The elastic membrane 6 is stretched by the inner member 2 "one turn" as the movable leg 31 of the movable member 3 moves from the first notch 112a to the second notch 112 b. The movable member 3 includes at least two sub-movable members 30 surrounding the outer peripheral wall 11 of the outer member 1 to form a circle, each sub-movable member 30 includes a fixed portion 301 adjacent to the distal end 10 of the outer member 1 and a free portion 302 away from the distal end 10 of the outer member 1, the movable member 3 of the present embodiment further includes a movable ring 33 for connecting the fixed portions 301 of the sub-movable members 30 together, correspondingly, the movable ring 33 has a first annular groove for connecting the fixed portions 301 of the sub-movable members 30 together, each sub-movable member 30 includes a corresponding movable leg 31 connected to the movable ring 33, and the movable leg 31 of each sub-movable member 30 has an inclined surface 311 deflecting along the circumferential direction. The fixed portion 301 of each of the sub moving members 30 is connected to the movable ring 33 by using the movable ring 33 as a reference, the free end of each of the sub moving members 30 can be deformed to expand outward in the radial direction with the respective fixed portion 301 as a supporting point, and the movable leg 31 of each of the sub moving members 30 has an inclined surface 311 deflecting in the circumferential direction, and can be better moved from the first notch 112a to the second notch 112 b. The outer peripheral wall 11 of the outer member 1 further includes a retaining ring 5 adjacent to the free portion 302 of each of the sub-moving members 30, and the free portion 302 of each of the sub-moving members 30 abuts against the retaining ring 5, so that the inner member 2 can drive each of the sub-moving members 30 to deform and expand radially outward by applying a force to the free portion 302 of each of the sub-moving members 30 through the retaining ring 5. The limit ring 5 further has a second annular groove 51 at the distal end 10 away from the outer member 1, the movable ring 33 has a third annular groove 333 at the proximal end adjacent to the outer member 1, two peripheral edges of the elastic membrane 6 are respectively connected to the second annular groove 51 and the third annular groove 333, when the free portion 302 of each of the sub-movable members 30 abuts against the limit ring 5, the free portion can drive each of the sub-movable members 30 to deform radially outwardly, at this time, the movable ring 33 approaches the limit ring 5, so that the second annular groove 51 and the third annular groove 333 approach each other, and the elastic membrane 6 is further expanded.

In addition, the inner member 2 further comprises an operating part 20 which is far from the far end 10 of the outer member 1 and is used for operating the inner member 2 to move relative to the outer member 1 by a surgeon, the outer peripheral wall 11 of the outer member 1 is provided with a mounting hole 110 for mounting a perforated member 21, the inner member 2 is provided with at least two projections 24 which protrude out of the outer surface of the inner member 2 and annular convex rings 25 which are positioned at the tail ends of the projections 24, and gaps 26 between the adjacent projections 24 and the annular convex rings 25 jointly form a socket 221 which can be inserted by the movable foot 31. The projections 24 are first projections 241 parallel to the longitudinal axis of the inner member 2 and second projections extending from the first projections 241 to the longitudinal axis of the inner member 2, the second projections have a smaller width extending in the circumferential direction than the first projections, first sockets 221 are formed between adjacent first projections, second sockets 221 are formed between adjacent second projections and between the annular beads, when the inner member 2 is moved relative to the outer member 1 in a direction away from the distal end 10 of the outer member 1, the movable foot 31 of each sub-movable member 30 enters the first insertion opening 221 of the inner member 2, and in the state that the inner member 2 deflects circumferentially by itself, the movable leg 31 of each sub-movable member 30 can enter the second insertion opening 221 of the inner member 2, so that the movable leg 31 of the movable member 3 moves from the first notch 112a into the second notch 112b, and finally the movable member 3 can be deformed to expand radially outward at least partially. When the inner member 2 moves in the longitudinal direction relative to the outer member 1, the first insertion opening 221 of the inner member 2 slides along the movable leg 31 of each of the sub-movable members 30 to expose the through hole member 21, the second insertion opening 221 of the inner member 2 is aligned with the position of each of the sub-movable members 30, when the puncture of the body wall of the patient is completed, the inner member 2 is deflected circumferentially so that each of the sub-movable members 30 can fall into the second insertion opening 221, and then when the inner member 2 moves in the backward direction (i.e., the inner member 2 moves in the direction away from the distal end 10 of the outer member 1 relative to the outer member 1), the movable leg 31 falling into the second insertion opening 221 of the inner member 2 can move from the first notch 112a to the second notch 112b, so that the movable member 3 exerts force on the free portion 302 of each of the sub-movable member 30 due to the restriction of the stopper ring 5, thereby driving each of the movable member 30 to deform in an outward radial direction, thereby effecting the stretching of the elastic membrane 6.

The outer member 1 of this embodiment is cannulated and the distal end 10 of the outer member 1 is provided with a seal assembly preferably releasably mounted on a cannula housing at the distal end 10 of the outer member 1. the means for releasably connecting the seal assembly to the cannula housing may comprise a bayonet coupling, a screw coupling, a snap fit or the like, the seal assembly comprising a seal housing 100 and at least one inner seal adapted to form a fluid tight membrane 1001 around an instrument inserted through the seal assembly or a valve body structure which may or may not be part of the cannula assembly which closes in the absence of a surgical instrument and which is adapted to prevent the passage of pneumoperitoneum gases through the outer member 1. the piercing member 21 of this embodiment is of a pointed or truncated conical structure. When the inner member 2 is moved in the longitudinal direction relative to the outer member 1 during the laparoscopic surgery, the first insertion hole 221 of the inner member 2 slides along the movable leg 31 of each of the sub-movable members 30 to expose the through hole member 21, the second insertion hole 221 of the inner member 2 is aligned with the position of each of the sub-movable members 30, when the puncture of the body wall of the patient is completed, the inner member 2 is deflected in the circumferential direction so that each of the sub-movable members 30 can fall into the second insertion hole 221, and then when the inner member 2 moves in the retreating direction (i.e., the inner member 2 moves in the direction away from the distal end 10 of the outer member 1 relative to the outer member 1), the movable leg 31 falling into the second insertion hole 221 of the inner member 2 can move from the first notch 112a to the second notch 112b, so that the movable member 3 exerts force on the free portion 302 of each of the sub-movable member 30 due to the restriction of the retainer ring 5, thereby drive each sub-moving part 30 and take place the deformation of radially outwards expanding, and then realize strutting of elastic membrane 6, then remove the piece 4 that supports on the periphery wall 11 of external component 1 to patient's stomach wall, support and hold the piece 4 and form the centre gripping space of centre gripping with the elastic membrane 6 that is strutting jointly to the condition emergence that the ware of preventing often appears deviating from the external body and go deep into the internal in the operation process takes place.

Finally, the puncture instrument of the present embodiment is capable of performing a gastric cavity operation in which the movable members 3 are arranged in two at intervals along the longitudinal axis of the outer member 1, and the intervals between the adjacent movable members 3 are provided with engaging portions 111 engageable with tissue. For performing gastric cavity surgery, when the puncture member 21 performs puncture through the body wall of the patient and then performs puncture of the stomach wall, since the two movable members 3 are provided, wherein one rotation of the inner member 2 causes the first movable member 3 to form the distraction of the first elastic membrane 6 ', the outer member 1 can be better connected with the stomach wall through the joint 111, at which time the inner member 2 is rotated in the opposite direction to perform one rotation again to pull the inner member 2 from the outer member 1 while partially withdrawing the inner member 2 and drawing the stomach wall into the body wall of the patient under the distraction of the first elastic membrane 6', at which time one rotation of the inner member 2 causes the second movable member 3 to form the distraction of the second elastic membrane 6", at which time the inner member 2 is rotated in the opposite direction to completely withdraw the inner member 2 from the outer member 1, so as to perform surgery using a surgical instrument inserted into the outer member 1, avoiding the hidden trouble caused by the operation of inflating in the stomach cavity. The outer peripheral wall 11 of the external component 1 is also provided with a supporting piece 4 which can move relative to the moving piece 3, the supporting piece 4 and the stretched elastic membrane 6 together form a clamping space for clamping the abdominal wall of the patient, and finally the external component 1 can be more stably fixed on the abdominal wall of the patient through the arrangement of the supporting piece 4, so that the puncture outfit is prevented from being taken out of the body and entering the body frequently in the operation process. After the operation is finished, the first elastic membrane 6 'and the second elastic membrane 6 "need to be folded back by the inner member 2, and the operation is opposite to the operation of opening the first elastic membrane 6' and the second elastic membrane 6".

Claims (9)

1. A puncture instrument, comprising:

an outer member (1), the outer member (1) for defining a longitudinal axis and having an outer peripheral wall (11);

an inner member (2), the inner member (2) comprising a piercing member (21) adjacent the distal end (10) of the outer member (1), the inner member (2) being movable relative to the outer member (1) in a longitudinal direction and enabling penetration through tissue in a state in which the piercing member (21) is at least partially exposed from the outer circumferential wall (11);

the method is characterized in that: also includes:

-a mobile element (3) having at least one peripheral wall (11) arranged on the outer element (1), the mobile element (3) being able to move away from the perforated element (21) upon actuation of the inner element (2) so as to realize a deformation of the mobile element (3) able to expand radially outwards at least in part.

2. The puncture instrument according to claim 1, characterized in that: the moving part (3) comprises two first moving parts (3 ') entering the stomach cavity and two second moving parts (3') entering the abdominal cavity, wherein an engaging part (111) capable of being engaged with the stomach wall is arranged between the first moving part (3 ') and the second moving part (3').

3. The puncture instrument according to claim 2, characterized in that: the joint part (111) is a thread, the peripheral wall (11) of the external component (1) is further provided with a propping piece (4) capable of moving relative to the moving piece (3), and the propping piece (4) and the stretched moving piece (3) jointly form a clamping space for clamping the abdominal wall of a patient.

4. A puncture instrument according to any one of claims 1 to 3, characterized in that: the movable part (3) is provided with a movable foot (31) capable of extending into the outer peripheral wall (11), the inner component (2) is provided with an actuating part (22), the actuating part (22) is provided with a socket (221) capable of allowing the movable foot (31) to be inserted, and under the condition that the movable foot (31) of the movable part (3) is inserted into the socket (221) of the actuating part (22), the movable part (3) can be at least partially deformed in a radial outward expansion mode when the inner component (2) moves in a direction away from the far end (10) of the outer component (1) relative to the outer component (1).

5. The puncture instrument according to claim 4, wherein: the outer peripheral wall (11) of the outer member (1) is provided with a limiting notch (112) for limiting the moving path of the moving foot (31) of the moving member (3), the inner member (2) can deflect circumferentially when moving relative to the outer member (1) in the direction away from the far end (10) of the outer member (1), and the moving member (3) can be deformed to expand outwards in the radial direction at least partially under the actuation of the deflection force.

6. The puncture instrument according to claim 5, wherein: the limiting notch (112) comprises a first notch (112a) parallel to the longitudinal axis direction of the external member (1) and a second notch (112b) perpendicular to the longitudinal axis direction of the external member (1), and the first notch (112a) is communicated with the second notch (112 b); the movable foot (31) of the movable element (3) can be moved from the first recess (112a) into the second recess (112b) in a state in which the inner element (2) can deflect itself in the circumferential direction when moved relative to the outer element (1) in a direction away from the distal end (10) of the outer element (1).

7. The puncture instrument according to claim 6, wherein: the movable element (3) comprises at least two sub-movable elements (30) which surround the outer peripheral wall (11) of the outer element (1) to form a circle, each sub-movable element (30) comprises a fixed part (301) adjacent to the far end (10) of the outer element (1) and a free part (302) far away from the far end (10) of the outer element (1), wherein the movable element (3) further comprises a movable ring (33) for connecting together the fixed portions (301) of the respective sub-movable elements (30), correspondingly, the movable ring (33) has a first annular groove connecting the fixed portions (301) of the respective sub-movable members (30) together, each sub-movable part (30) comprises a corresponding movable foot (31) connected to the movable ring (33), and the movable leg (31) of each sub-movable member (30) has an inclined surface (311) that deflects in the circumferential direction.

8. The puncture instrument according to claim 7, wherein: the outer peripheral wall (11) of the outer component (1) further comprises a limiting ring (5) adjacent to the free portion (302) of each sub-moving part (30), and the free portion (302) of each sub-moving part (30) abuts against the limiting ring (5), so that the inner component (2) can drive each sub-moving part (30) to deform in a manner of expanding outwards in the radial direction by applying force to the free portion (302) of each sub-moving part (30) through the limiting ring (5).

9. The puncture instrument according to claim 8, wherein: the periphery of the movable piece (3) is coated with an elastic membrane (6), the elastic membrane (6) is stretched in a state that the movable piece (3) is at least partially deformed in a radially outward expansion mode, a second annular groove (51) is formed in a far end (10) of the limiting ring (5) far away from the external member (1), a third annular groove (333) is formed in a near end of the movable ring (33) close to the external member (1), and two peripheral portions of the elastic membrane (6) are connected to the second annular groove (51) and the third annular groove (333) respectively.

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