288 results about "Outer Cannula" patented technology

The pair of expandable foreign body forceps comprises an outer sleeve and a foreign body forceps body, a limiting assembly is arranged at one end of the outer sleeve, and an expansion assembly is arranged at one end of the outer sleeve; the expansion assembly comprises a first notch formed in one end of the outer sleeve, an expansion air pipe is arranged in the first notch, one end of the expansion air pipe is fixedly connected with an expansion air bag, one end of the expansion air pipe is fixedly connected with a three-way pipe, one end of the three-way pipe is fixedly connected with an injector, and one end of the three-way pipe is provided with an expansion valve. A rotating plate is rotationally installed on the outer surface of the cylinder, an arc-shaped plate is fixedly installed on one side of the rotating plate, and an anti-skid pad is fixedly installed on the inner surface of the arc-shaped plate. According to the pair of expandable foreign body forceps, foreign bodies can be blocked while an esophageal cavity is expanded through the arranged expansion assembly, so that the situation that the foreign bodies are pushed to deeper tissues is prevented, and the efficiency of taking out the foreign bodies by the pair of expandable foreign body forceps is improved.

The invention relates to the technical field of dissectors, and discloses a medical ablation electrode dissector which comprises a handle sleeve and further comprises an electric knife head fixedly connected with the handle sleeve, a splicing sleeve fixedly connected to one end of the handle sleeve, a push-pull piece slidably connected with an outer sleeve and a guide pipe fixedly connected between the splicing sleeve and the outer sleeve. The two separators are both connected with the push-pull piece in a sliding mode, the viscous sleeve is fixedly connected to the end, away from the splicing sleeve, of the guide pipe, the electrotome head penetrates through the splicing sleeve and the guide pipe, and the push-pull piece is attached to the guide pipe. Through a sliding connection structure of the push-pull piece and the separator, reciprocating motion of the separator is achieved, active cleaning of the surface of the electrotome head can be completed, impurity splashing caused by outward pushing force of a traditional pushing stripping structure is avoided, the separator is of an arc-shaped structure matched with the surface profile of the electrotome head, stress is uniform during cleaning, the cleaning precision is improved, and the service life of the electrotome head is prolonged. And cleaning blind areas are reduced.

The invention relates to the technical field of medical instruments, in particular to a split type hemorrhoid artery ligation hemorrhoid suspension operation positioning device and application thereof. The device comprises an outer sleeve and an inner sleeve, the inner sleeve is movably and / or rotatably arranged in a cavity of the outer sleeve, the outer sleeve is provided with an outer sleeve operation window, the inner sleeve is provided with an inner sleeve operation window, and the outer sleeve operation window and the inner sleeve operation window can be moved or rotated. The outer sleeve operating window and the inner sleeve operating window are at least partially aligned with each other at at least one operating window position; the outer sleeve and the inner sleeve longitudinally extend to at least partially form a cylindrical or conical or truncated cone-shaped structure, the outer sleeve forms a tubular shell main body and a shell split body along the longitudinal extension direction, and the side edges of the tubular shell main body and the shell split body are detachably connected; an optical unit is arranged on the shell split body so as to irradiate the cavity of the outer sleeve.

The plugging drainage device comprises an outer sleeve, a flushing pipe, an inner suction pipe and an umbrella-shaped plugging mechanism, a plurality of first through holes are formed in the front end of the outer sleeve, the inner suction pipe is arranged in the outer sleeve, a plurality of second through holes are formed in the front end of the inner suction pipe, and the umbrella-shaped plugging mechanism is arranged in the inner suction pipe. The umbrella-shaped plugging mechanism is arranged at the front end of the outer sleeve and can be retracted into the outer sleeve. The device is provided with the plugging mechanism, the fistula can be plugged during flushing, intestinal juice loss is effectively avoided, postoperative recovery of a patient is facilitated, the umbrella-shaped structure is adopted for plugging, compared with bag plugging, the umbrella fabric of the umbrella-shaped structure can be tightly attached to the wound surface, obstruction is effectively avoided, and the application safety of the device is further improved.

A bone marrow aspiration device includes an outer cannula connected to an outer handle, and a first cannula that fits through the outer cannula and extends beyond a distal end of the outer cannula. The first cannula is connected to a first handle including a mating feature. A removable sharp stylet fits coaxially through the first cannula and is connected to a stylet handle including a mating feature to engage with the mating feature of the first handle, to couple the stylet handle to the first handle. A proximal end of stylet forms an adapter to couple to a drill, the first cannula and stylet rotating together when driven by the drill coupled to the adapter. A second cannula fits through the first cannula once the stylet is removed, a distal end of the second cannula closing off the distal end of the first cannula but leaving open one or more side apertures in the first cannula, to aspirate bone marrow through the open side apertures. A screw mechanism, formed by a lead screw extending from the first handle and engaging a threaded portion of the outer handle, allows the first cannula to be retracted through the outer cannula with rotation of the first handle relative to the outer handle.

Provided is a method for determining bending information, applied to a luminal endoscope outer sleeve. A plurality of bending measurement tubes are sequentially arranged on an inner wall of the luminal endoscope outer sleeve; each of the bending measurement tubes corresponds to a unique digital identifier; the bending measurement tubes each comprise a cable and a bourdon tube, wherein fixing end points of the cable and the bourdon tube on the inner wall of the outer sleeve are the same, a fixing starting point of the cable is located at one of a plurality of first calibration positions on the inner wall of the outer sleeve, and a fixing starting point of the bourdon tube is located at a second calibration position of the inner wall of the outer sleeve; a displacement sensor is arranged at the fixing starting point of the cable of each of the bending measurement tubes; and fixing end points of the bending measurement tubes on the inner wall of the outer sleeve are different. The method comprises: for the plurality of bending measurement tubes, determining cable displacement information on the basis of the displacement sensors (S110); and determining bending information of the luminal endoscope outer sleeve on the basis of the digital identifiers of the plurality of bending measurement tubes, the cable displacement information, and sectional diameters of the bourdon tubes (S120).

The invention relates to the technical field of medical auxiliary instruments, in particular to an anti-falling and anti-leakage thoracic and abdominal cavity drainage auxiliary device which comprises a self-sleeving elastic tube, a fixing cover, a hoop ring and an infusion piece, the self-sleeving elastic tube comprises an inner sleeve part and an outer sleeve part with an air bag arranged at one end, the inner sleeve part is inserted into the outer sleeve part, and the fixing cover is arranged on the outer sleeve part; the air bag end of the outer sleeve part is hermetically connected with one end of the inner sleeve part; the fixed cover is movably sleeved outside the outer sleeve part; the shroud ring is movably connected to the fixed cover in a sleeving manner; and the infusion piece is communicated with the air bag. The auxiliary drainage tube can adapt to patients with different cortex thicknesses, the fixing depth of the auxiliary drainage tube in the pleuroperitoneal cavity is more appropriate, and the anti-leakage effect is achieved.

This invention generally relates to a method for performing an endoscopic procedure. According to some aspects of the invention, the method comprises placing an endoscope shaft within a body cavity at a desired examination point, the endoscope shaft having a proximal end, mid shaft and a distal end, the distal end terminating in an endoscope tip, wherein the endoscope tip is proximal to the desired examination point, positioning a segment of a longitudinally opened overtube over the endoscope mid shaft, wherein the overtube including a longitudinal reclosable seam along an entire length of the overtube, an inner surface, an outer surface, a proximal end and a distal end, a positioning ring adjacent the distal end on the outer surface, at least one sealing band on the inner surface, and an independently positionable occlusion catheter terminating in an asymmetrical occlusion balloon; at least one handle at the proximal end and on the outer surface for grasping and manipulation of the overtube within the body cavity. The method further comprises closing the seam of the segment of the overtube positioned over the endoscope mid shaft to form a longitudinally closed overtube and move the closed overtube over the endoscope shaft as guide within the body cavity and repeat the closing and moving till the overtube reaches the desired examination point, inflating the positioning ring to create a seal between the outer surface of the overtube and a body cavity proximal to the endoscope tip, wherein when inflated the positioning ring expanded asymmetrically around the overtube, inflating the at least one sealing band to create a seal between the internal surface of the overtube and endoscope shaft, passing the independently positionable occlusion catheter terminating in the asymmetrical occlusion balloon through a passageway along the overtube to enter the body cavity at the end of the overtube, manipulating the independently positionable occlusion catheter to a selected point within the body cavity distal to the endoscope tip, inflating the occlusion catheter balloon to create seal between the occlusion catheter balloon and the body cavity, and creating a sealed examination compartment between the positioning ring, the asymmetrical occlusion balloon and the sealing band surrounding the distal end of the endoscope shaft.

A device for tissue shaving includes an elongated outer cannula having a tissue pinching distal end, an elongated inner shaft extending through the cannula and having a tissue shaver at a distal end. The tissue pinching distal end of the outer cannula is configured to pinch a portion of the tissue and the tissue shaver of the inner shaft is configured to be rotated and cut the pinched tissue portion via a shearing action.

An optical cannula system can include a cannula, a body, a first tube, a second tube, and a valve assembly. An outer cannula wall can define an interior space extending along an axis of the cannula. One or more inner cannula walls within the outer cannula wall can divide the interior space into a first channel and a second channel. A proximal portion of the cannula can be received within the body. The first and second tubes can extend from the body. The valve assembly can have a first configuration in which the first tube is in fluid communication with the first channel and the second tube is in fluid communication with the second channel. The valve assembly can have a second configuration in which the first tube is in fluid communication with the second channel and the second tube is in fluid communication with the first channel.

Aspects of the present invention relate to a method for locating an expandable implant for treating BPH within the prostatic urethra of a patient. The delivery device comprises an inner tube and an outer sleeve moveable relative to the inner tube between a stored position and a deployed position. The outer sleeve surrounds the inner tube to define an annulus therebetween and the expandable implant is retained within the annulus when the outer sleeve is in the stored position.

The invention discloses a double-channel negative pressure flushing device with an alarm function, and particularly relates to the technical field of peritoneal flushing, the double-channel negative pressure flushing device comprises a double sleeve, a flushing pipe of the double sleeve is connected with a flushing pipeline, and a suction pipe of the double sleeve is connected with a negative pressure drainage assembly through a drainage pipe fitting; the drainage pipe fitting comprises a drainage pipe and an outer sleeve arranged on the outer side of the drainage pipe in a sleeving mode, a plurality of first steel wire rings are arranged on the inner wall of the outer sleeve, a plurality of inner supporting pieces are fixed to the drainage pipe and used for reducing the probability that the drainage pipe is bent and blocked, and an outer protection assembly is arranged on the outer side of the double sleeves. The probability that the double sleeves and the drainage tube are bent and blocked is low, and an alarm can be given when the double sleeves and the drainage tube are bent and blocked and the collection container is about to be full of liquid, so that normal flushing work is guaranteed, and the treatment effect is guaranteed.

The embodiment of the present application provides a laser ablation catheter, which comprises a laser fiber bundle, an adjustable head, an outer tube, a sleeve and a connector; the outer tube wraps the laser fiber bundle; the adjustable head comprises an adjustable support made of a shape memory material and sleeved at one end of the outer tube; the connector is connected to the other end of the outer tube, and the laser fiber bundle can be connected to a laser generator through the connector; the sleeve is sleeved outside the adjustable support and used for compressing the adjustable support; at least one end of the adjustable support is a movable end, and the movable end is slidingly connected to the outer tube; when the sleeve is removed, the movable end provides a condition for the deformation of the adjustable support. The laser ablation catheter is kept in the center of a target blood vessel through the adjustable head, so that the laser is concentratedly irradiated to a lesion position and the adverse effect on a blood vessel wall is reduced.

The utility model discloses a centrum puncture biopsy needle which comprises an outer tube structure, the outer tube structure comprises an outer sleeve, the outer sleeve is provided with an outer tube handle, the outer tube handle is provided with a main installation opening communicated with the outer sleeve, and the outer sleeve can be spliced with an inner core structure or an inner tube structure; the inner core structure comprises a puncture cone, a cone handle is arranged at one end of the puncture cone, and the cone handle is connected with the outer tube handle through an assembling assembly; according to the puncture device, tissue sclerotin can be effectively cut off, sclerotin tissue can be cut into the inner sleeve, target sclerotin can be conveniently extracted, the problem that an existing puncture device cannot accurately extract the target sclerotin is solved, positioning and assembling can be conducted, the precision during assembling is improved, and the puncture device is convenient to use. The precision of sampling operation is ensured, and the use is convenient.

In the using process of the stitching instrument, a puncture part is arranged at a needle inserting limit position and a needle withdrawing limit position in an outer sleeve in the axial direction in a reciprocating motion mode, a negative pressure source opening and closing triggering element is arranged on a shell, and the negative pressure source opening and closing triggering element is used for opening or closing a negative pressure source. The negative pressure source opening and closing triggering element is triggered when the puncture piece is in the far-end stroke so that the negative pressure source can be kept open, and the negative pressure source opening and closing triggering element is not triggered when the puncture piece is in the near-end stroke so that the negative pressure source can be kept closed. Namely, the state of the negative pressure source is automatically adjusted according to the real-time position information of the puncture piece, the negative pressure source does not need to be adjusted through manual operation, the operation difficulty is lowered, the error rate is lowered, the automation degree is improved, and the suturing efficiency is greatly improved.

The utility model relates to the technical field of glycerine enema, in particular to an anti-reflux auxiliary device for glycerine enema, which comprises a liquid medicine capsule, an intubation tube is fixedly connected to the right end of the liquid medicine capsule, a plugging tube is movably connected to the outer surface of the intubation tube in a penetrating manner, an outer sleeve is movably connected to the outer surface of the plugging tube in a penetrating manner, and the right end of the intubation tube is of a cambered surface structure. A plurality of liquid medicine spraying holes are formed in the right end of the intubation tube, a liquid feeding cavity and a movable cavity are formed in the intubation tube, the movable cavity is communicated with the liquid feeding cavity, a ball is arranged in the movable cavity, and a partition plate is fixedly connected to the inner wall of the movable cavity and located on the right portion of the ball. According to the anti-reflux auxiliary device for the glycerine enema, liquid medicine can be prevented from reflowing and splashing, and the cleaning burden is reduced.

Aspects of the present invention relate to a delivery device for locating an expandable implant for treating BPH within the prostatic urethra of a patient. The delivery device comprises an inner tube and an outer sleeve movable relative to the inner tube between a stored position and a deployed position. The outer sleeve surrounds the inner tube to define an annulus therebetween and the expandable implant is retained within the annulus when the outer sleeve is in the stored position.

The utility model discloses an abdominal cavity drainage tube device which comprises a drainage tube, an outer sleeve, an outer air bag, an inner air bag, an air bag inflation and deflation connector and a limiting ring. The drainage tube is sleeved with the outer sleeve, and an air bag channel extending in the length direction of the outer sleeve is arranged in the tube wall of the outer sleeve; the outer air bag surrounds the outer part of the near end of the outer cannula and is communicated with the air bag channel; the inner air bag surrounds between the interior of the near end of the outer cannula and the drainage tube and is communicated with the air bag channel; the air bag inflation and deflation connector is connected to the outer portion of the far end of the outer sleeve and communicated with the air bag channel. The limiting ring is arranged outside the outer sleeve and located on the far end side of the outer air bag, and an interval used for limiting the abdominal cavity wall is formed between the limiting ring and the outer air bag.

The application discloses an ear-nose-throat department rhinitis and rhinosinusitis nasal cavity flushing device, and belongs to the technical field of medical instruments, which comprises a flushing liquid injection mechanism and an inner-outer cannula breathing mechanism which are used in cooperation, wherein the flushing liquid injection mechanism comprises a liquid storage bag and a first conducting pipe, the first conducting pipe is connected with the liquid storage bag through a liquid delivery pipe, a nasal cavity liquid supply assembly and a nasal cavity foreign matter cleaning assembly are arranged on the first conducting pipe, and the nasal cavity liquid supply assembly is used in cooperation with the liquid delivery pipe; the inner-outer cannula breathing mechanism comprises a second conducting pipe, and a flushing liquid discharge assembly and a positioning assembly are arranged on the second conducting pipe; through the arrangement of the flushing liquid injection mechanism and the inner-outer cannula breathing mechanism, the device can effectively clean the nasal cavity of a patient, meets the demand of different cleaning modes, and has the characteristics of good cleaning effect, simple and convenient use and low manufacturing cost.

An arthroscopic cutting probe includes an outer sleeve having a longitudinal bore and an outer cutting window at its distal end. An inner sleeve is rotationally disposed in a bore of the outer sleeve, and the inner sleeve has a distal end, a proximal end, a longitudinal passageway, and an inner cutting window at its distal. An active electrode sleeve is disposed on an outer surface of the inner sleeve in a position opposed to the inner cutting window. Rotation of the inner sleeve relative to the outer sleeve causes the inner cutting window to rotate past the outer cutting window to resect tissue received through the cutting windows as they pass each other. Radiofrequency current can be applied to the active electrode to enhance tissue cutting then the cutting windows are being rotated or to able or cauterize tissue when the cutting windows are held stationary with the active electrode disposed through the outer cutting window.

The utility model discloses a blood RNA preservation tube which comprises an outer tube body, a placing cylinder, an outer tube cover, an inner tube body and an inner tube cover, a second outer thread groove is formed in the outer side of the top of the outer tube body, a stable base is fixedly installed at the bottom of the placing cylinder, a second inner thread groove is formed in the bottom of an inner cavity of the outer tube cover, and a first inner thread groove is formed in the top of an inner cavity of the inner tube body. Scale marks are arranged on the outer side of the inner tube body. The design of the inner sleeve and the outer sleeve is adopted, the inner sleeve body contains pre-loaded RNA preserving fluid used for directly preserving a blood RNA sample, the outer sleeve body provides a protection function, the stability and the use convenience of RNA preservation are further improved through an independent double-layer sealing structure and an optimized volume design, the outer sleeve body is made of an ultraviolet-proof transparent material, and the service life of the inner sleeve body is prolonged. The inner tube body is designed to be of a small-size structure, a negative pressure environment is arranged, waste of preservation liquid is effectively reduced, and meanwhile the risk of RNA degradation caused by oxygen is reduced.

The invention belongs to the technical field of medical instruments, and relates to an abdominal cavity puncture assembly for V-P shunt real-time image guidance. The puncture kit provided by the invention comprises an image guiding assembly and a puncture assembly. The image guiding assembly comprises a display and a transmission line and is used for transmitting image information; the puncture assembly is composed of an inner sleeve core and an outer sleeve, a light source and a camera are arranged at the tail end of the inner sleeve core, abdominal cavity images can be collected in real time, and the outer sleeve is formed by oppositely connecting a first sleeve and a second sleeve and provided with a thorn tip and a tube containing hole. When in use, the inner sleeve core is inserted into the outer sleeve, the handle is held by hand to puncture, the shunt tube is inserted and placed in place under the guidance of an image, and finally, the fixator is taken down, and the outer sleeve is pulled out. According to the kit, a minimally invasive incision (about 1cm) can be realized, accurate puncture and placement of the shunt tube can be realized under the guidance of an image, the shunt tube is ensured to be in place, smooth drainage is ensured, and the outer sleeve can be detached and pulled out under the condition that the shunt tube is not moved.

The utility model belongs to the technical field of veterinary insemination devices, and particularly relates to a veterinary insemination tube ejector which comprises an outer sleeve and an inner needle tube, and the inner needle tube penetrates through the outer sleeve. The outer sleeve comprises a sleeve and a sleeve handle, the sleeve handle comprises a base and a cover plate, and the cover plate covers the front end of the base; a sleeve fixing groove, a semen deposition sleeve fixing groove and a clamping piece fixing groove are sequentially formed in the sleeve handle from back to front, a first semen deposition sleeve penetrating hole is formed in the cover plate, and the diameter of the first semen deposition sleeve penetrating hole is equal to the inner diameter of the semen deposition sleeve fixing groove. The sleeve is inserted into the sleeve fixing groove to be fixed and sequentially penetrates through the semen deposition sleeve fixing groove, the clamping piece fixing groove and the first semen deposition sleeve penetrating hole. A reset spring and an L-shaped clamping piece are arranged in the clamping piece fixing groove, the reset spring is located on the rear side of the L-shaped clamping piece, and the rear portion of the L-shaped clamping piece abuts against the front portion of the reset spring. A clamping piece reserved hole is formed in the side wall of the clamping piece fixing groove, and the L-shaped clamping piece penetrates through the clamping piece reserved hole. A second semen deposition sleeve penetrating hole is formed in the L-shaped clamping piece, and the sleeve penetrates through the second semen deposition sleeve penetrating hole. The inner needle tube comprises a long needle head and a push-pull handle, the long needle head is inserted into the sleeve, and the push-pull handle is arranged on the outer side of the rear end of the sleeve handle.

The utility model discloses a kind of cerebral angiography and treatment of radial artery approach combined catheter, belong to medical instrument technical field, the catheter includes outer sleeve and inner core pipe;The outer sleeve includes outer tube body, the inner core pipe is movably threaded in the lumen of outer sleeve, the inner core pipe includes connected proximal end tube body and distal end tube body, the distal end tube body is pre-shaped structure, the pre-shaped structure of the distal end tube body is formed by multiple arc transition sections connected head to tail, the multiple arc transition sections constitute hook shape and the head end of distal end tube body extends to the outside of hook, the length of the pre-shaped structure of the distal end tube body is 12.5-18.5cm.The utility model sets outer sleeve and inner core pipe as independent catheter, without nesting and unscrewing when operating, reduce blood vessel injury risk;Inner core pipe has stronger superselective ability, can be directly used for the superselective angiography of target blood vessel.

The present application relates to the technical field of medical devices, in particular to a pelvis fracture nail setting combination tool, which comprises a sleeve and a needle core, the needle core can be inserted into the sleeve, and the holding end of the needle core can be detachably connected with the holding end of the sleeve; a plurality of limiting mechanisms for fixing the needle core and the guide needle are symmetrically arranged in the sleeve, and when the guide needle is located in the sleeve, the limiting mechanisms can allow the sleeve to be pulled out along the guide needle. The needle core comprises an inner core with a pointed end at the distal end and a handle two, and the proximal end of the inner core is fixedly connected with the handle two; a groove two is formed in the side wall of the handle two which is in contact with the needle core, and a protrusion corresponding to the groove two is arranged on the side wall of the sleeve which is in contact with the handle two; after the sleeve is inserted into the needle core and rotated, the protrusion can be rotated into the groove two to realize fixation. The quick locking structure of the needle core and the outer sleeve and the linkage clamping and limiting design of the guide needle significantly improve the smoothness of the nail setting operation and the stability of the guide needle, and realize the effects of locking and preventing the guide needle from being separated after being inserted, and easily separating without disturbing when the sleeve is pulled out.

The invention discloses an intragastric balloon recovery device and a system for taking out an intragastric balloon, and relates to the technical field of medical instruments. By arranging the pushing assembly and the locking assembly, the locking assembly can control the pushing piece to move and be fixed in the outer sleeve, then the puncture needle at the far end is pushed out of the outer sleeve or fixed in the outer sleeve, the puncture needle can stretch out of the outer sleeve and puncture the intragastric balloon, and the fixed balloon is limited in the intragastric balloon; therefore, the medium in the intragastric balloon and the intragastric balloon body can be drawn out through a single instrument and single operation. The process is easy to operate, operation instruments do not need to be replaced frequently, and the suction process is stable; the design of the Y-shaped Luer taper ensures that the suction channel and the puncture structure of the pushing assembly are separated on the holding handle, so that the intragastric balloon recovery device provided by the invention can realize the suction function without completely extracting the needle out of the outer sleeve.

The utility model discloses a centrum focus tissue sampling device which comprises an outer sleeve and an inner sleeve and further comprises an inner core sampling structure, the inner sleeve is clamped in the outer sleeve and can be disassembled and assembled, the inner core sampling structure is movably arranged in the inner sleeve, and the inner core sampling structure is connected with the outer sleeve. The inner core sampling structure is matched with the inner sleeve to rotate to sample focus tissues; the inner core sampling structure comprises an inner core rod, a sampling rod is arranged on one side of the inner core rod, a cone part is arranged at the end of the sampling rod, and a threaded tip is arranged on the sampling rod. By adopting the closed structure of the inner core sampling structure and the inner sleeve, the sampling of the focus tissue is facilitated, the focus tissue at the same part can be sampled for multiple times, the operation is convenient, and the replacement and sleeve connection are not needed.

The utility model relates to a nailing system for a surgical robot. The nailing system comprises a hollow nailing device and a hollow nail. And the hollow nail is detachably connected with the hollow nailing device. The hollow nailing device comprises an inner core and an outer sleeve arranged outside the inner core in a sleeving mode. A first through hole penetrating in the axial direction is formed in the inner core. The distal surface of the outer cannula is provided with external threads. The hollow nail comprises a nail seat and a hollow nail head fixedly connected with the nail seat. A cavity for assembling the far side part of the inner core is formed in the screw seat, and internal threads matched with the external threads are arranged on the screw seat. A second through hole penetrating in the axial direction is formed in the hollow nail head.

The application discloses a puncture needle device for nephrology and a sampling method, and belongs to the technical field of medical devices. The device comprises an outer sleeve needle body, an inner core assembly, a driving control assembly and a sampling structure. The inner sleeve needle body is internally provided with a sampling cavity and a sampling cavity which are independent of each other, the inner core assembly is coaxially assembled in the sampling cavity in a detachable manner, and is used for carrying out the acquisition, cutting and containing of tissues. The driving control assembly is in transmission cooperation with the inner core assembly, and provides driving force for the inner core assembly to complete the sampling action. The sampling structure is movably arranged in the sampling cavity, and is used for receiving and taking out the inner core assembly after the sampling is completed. The application adopts a pure mechanical structure design, keeps the outer sleeve needle body fixed after single puncture is in place, and realizes multiple continuous sampling only by replacing the inner core assembly, so that the defects of low sampling efficiency, easy sample damage, high risk of patient injury and the like of the existing puncture needle are solved, and the application has the advantages of convenient operation, safety and reliability.

The embodiment of the invention provides a sealing connection structure for a rich-resistance tube bundle and a tube plate and a heat exchanger. The sealing connection structure comprises an outer sleeve, an inner core, a tube hole sealing ring, a water side sealing ring and an annular sealing ring. The inner tube wall of the outer sleeve is provided with internal threads, and one end is connected with the tube hole of the tube plate; the outer wall of the inner core is provided with external threads matched with the internal threads of the outer sleeve, one end of the inner core is provided with a conical portion matched with the pipe hole, the inner core is provided with a through hole penetrating through the inner core, the inner wall of the through hole is provided with an annular sealing groove, and the inner wall of the end, away from the conical portion, of the through hole is provided with an end face groove. The pipe hole sealing ring is arranged between the end surface of the conical part and the inner wall of the pipe hole; the water side sealing ring is embedded in the end face groove, and the annular sealing ring is embedded in the annular sealing groove. When the inner core is screwed into the outer sleeve in a rotating mode, the conical portion of the inner core is connected with the pipe hole sealing ring in a pressing mode, the extending end of the rich-resistance pipe is connected with the water side sealing ring in a pressing mode, and the annular sealing ring is tightly attached to the outer wall of the rich-resistance pipe.