104 results about "Distal fixation" patented technology

The invention discloses a bending-adjustable catheter, and relates to the technical field of interventional medical instruments, the bending-adjustable catheter comprises an inner tube, an outer tube, a bending-adjustable supporting tube and a handle, the inner tube comprises an inner tube bending section located at the far end, the inner tube bending section can be bidirectionally bent, and the inner tube bending section at the far end of the inner tube extends outwards from the outer tube; position anchoring of the outer pipe can be achieved through the anchoring structure; the far end of the bending adjusting supporting pipe is connected with the bending adjusting section of the inner pipe, the far end of the outer pipe is fixed to the bending adjusting supporting pipe, and the elasticity modulus of the bending adjusting supporting pipe is smaller than that of the inner pipe. The handle is provided with an inner pipe pushing piece. When the outer tube is anchored to the inner wall of a blood vessel, axial acting force is applied to the inner tube through the inner tube pushing piece, the inner tube control bending section is bent under the action of the axial acting force and supporting force applied by the bending adjusting supporting tube, large-angle bending adjusting can be achieved at the far end of the inner tube, overall rotation of the inner tube and the outer tube is matched, and the far end of the inner tube can rotate in a three-dimensional space. The bending of the adjustable-bending catheter in any direction is realized, and the adjustable-bending catheter can better pass through a roundabout blood vessel.

This invention discloses an adjustable bending catheter, relating to the field of interventional medical device technology. It includes an inner tube, an outer tube, an adjusting support tube, and a handle. The inner tube includes a distally located curved section capable of bidirectional bending. A distally located internal control bending section extends outward from the outer tube. The outer tube is anchored via an anchoring structure. The distal end of the adjusting support tube is connected to the internal control bending section, and the distal end of the outer tube is fixed to the adjusting support tube. The elastic modulus of the adjusting support tube is less than that of the inner tube. The handle is equipped with an inner tube pushing component. When the outer tube is anchored to the inner wall of the blood vessel, an axial force is applied to the inner tube through the inner tube pushing component. The internal control bending section bends under the combined action of the axial force and the supporting force applied by the adjusting support tube. The distal end of the inner tube can achieve a large-angle bend. Combined with the overall rotation of the inner and outer tubes, the distal end of the inner tube can rotate in three-dimensional space, enabling the adjustable bending catheter to bend in any direction, thus facilitating passage through tortuous blood vessels.

The application discloses a valve cutting device. The valve cutting device comprises a catching catheter and a cutting member. The catching catheter comprises a tube body, the tube body comprises a main body section and an adjustable bending section arranged at the distal end of the main body section. The adjustable bending section has a bending state, in which the adjustable bending section forms a hook structure. The cutting member is in a linear structure. The cutting member extends along the main body section, the distal end of the cutting member is arranged to pass through the tube wall at the distal end of the main body section and is fixedly connected with the distal end of the adjustable bending section. The part of the cutting member located outside the tube body is an active section, the active section moves synchronously with the adjustable bending section. The active section comprises a cutting part, the cutting part is located at the concave side of the adjustable bending section in the bending state. The valve cutting device of the application has the advantages that the cutting member is arranged on the catching catheter, only one catheter is needed to realize the catching and cutting of the valve leaf, the structure is simple, the surgical procedure is simplified, and the damage to the patient can be reduced.

The application relates to the technical field of basket catheter, in particular to a basket catheter system and a basket catheter calibration method. The basket catheter system comprises a basket catheter, an operating handle, a tube body and a basket electrode assembly, the basket electrode assembly comprises a spline, a proximal end fixing seat and a distal end fixing seat, and the basket catheter system further comprises a proximal end position sensor and a distal end position sensor arranged on the proximal end fixing seat and the distal end fixing seat respectively; the basket catheter system further comprises a processing device, the proximal end position sensor and the distal end position sensor are connected with the basket catheter, and the processing device is used for obtaining a contact force of the basket electrode assembly and target tissue according to a proximal-distal end spacing change amount, a corresponding relationship between a known axial force value of the basket electrode assembly and the proximal-distal end spacing change amount and a contact angle of the basket electrode assembly and the target tissue. The application mainly solves the technical problem of how to detect the contact force of the basket catheter and the target tissue.

A holder for an annuloplasty ring that detaches with one cut. The annuloplasty ring mounts around a periphery of the holder without the use of connecting sutures. The holder has a proximal plate defining a lip on one side of the ring, and a distal retainer that defines a second lip on the other side, the two lips retaining the ring around the holder periphery. The distal retainer is formed by two hinged wings. A truss suture maintains the holder in a trussed configuration while the annuloplasty ring is delivered and secured to the implantation site. Once the ring is secured at the annulus, the truss suture is severed with one cut, enabling the hinged wings to pivot and the holder to be pulled free of the ring.

A delivery system for an intracorporeal device includes a sheath defining one or more lumens shaped to receive a delivery catheter or shaft and a guidewire. The system may include a delivery shaft having a distal coupling feature adapted to releasably couple with a proximal coupling feature of the intracorporeal device. The delivery system may further include a hub through which the delivery shaft and guidewire are passed. The delivery shaft may be coupled to a feature, such as a knob, that enables manipulation of the delivery shaft to decouple the distal fixation feature from the proximal fixation feature of the intracorporeal device in order to deploy the intracorporeal device within a patient.

The application relates to a balloon catheter, characterized in that the balloon catheter comprises a balloon, a catheter, a terminal tube, a developing ring, a catheter seat, a stress tube and a catheter sleeve, the catheter comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, the distal end of the inner tube is connected with the proximal end of the terminal tube, the distal end of the balloon is fixed on the outer surface of the terminal tube and / or the inner tube, the proximal end of the balloon is fixed on the outer surface of the distal end of the outer tube, the developing ring is arranged on the inner tube in the balloon, the stress tube is fixed on the distal end of the catheter seat, the proximal end of the inner tube is fixed inside the proximal end of the catheter seat through the stress tube and the catheter seat, the proximal end of the outer tube is fixed inside the distal end of the catheter seat through the stress tube and the catheter seat, and the catheter sleeve is sleeved outside the balloon. The balloon catheter can effectively treat arterial or venous stenosis and the like.

A single delivery needle configuration accommodates multiple soft tissue fixation devices at once. The configuration eliminates the need to reload a fixation delivery device when multiple fixation devices are required. Further, this configuration can include different variations of fixation devices. In embodiments, these fixation devices are typically manufactured from standard braided polyester suture that is cut into segments with predetermined lengths. This design allows the braided suture segments to be preloaded with a suture threaded through the preloaded braided suture segments with a slip knot placed on the proximal end of a first braided suture segments (e.g., distal fixation device). The tailing suture from the slip knot passes through the second, third, fourth braided suture segments, or any required quantity of braided suture segments that have been preloaded into the delivery device. The suture passes completely through a delivery device.

The present invention provides a medical device for forming an opening channel or access passage between body tubular lumens. [Solution] The present invention relates to a device that uses an elongated body, a proximal holding portion, and a distal holding portion to bring the muscle layers of a first body lumen and a second body lumen into contact and to form a long-term or permanent opening or access channel between them. The medical device comprises an elongated body that forms a lumen and includes a proximal portion, a distal portion, a certain length, and a certain diameter, wherein the elongated body 310 may have an elongated tubular form (e.g., a restrained form, an unexpanded form, or a transport form) and a retracted form (e.g., an unrestrained form, an expanded form, or an unfolded form) in which the proximal portion 312 expands radially into the proximal holding portion 314 and the distal holding portion 322 expands radially into the distal holding portion 324, with a cylindrical saddle portion 328 extending between them.

The invention relates to a thrombus extraction stent and a thrombus extraction system.The thrombus extraction stent comprises a thrombus separation assembly and a thrombus capturing assembly, the thrombus separation assembly comprises a stripping net and at least two anchor rods, each anchor rod comprises a fixed end and a free end, the fixed end is fixedly connected with the far end of the stripping net, and the free end extends towards the near end relative to the fixed end; the thrombus capturing assembly comprises a net-shaped collecting bin, the collecting bin comprises a first woven mesh basket, a contraction section and a second woven mesh basket, the first woven mesh basket can move towards the far end to be contained in the second woven mesh basket, so that the contraction section is bent to form an anchoring part, and the anchoring part is used for allowing the free end of an anchor rod to penetrate through; therefore, the stripping net is detachably connected with the anchoring part through the anchor rod. According to the thrombus extraction stent and the thrombus extraction system, the difficulty of cleaning thrombus in the thrombus extraction stent can be reduced, so that the efficiency of cleaning the thrombus in the thrombus extraction stent is improved.

This utility model discloses a multi-functional electrosurgical unit with adjustable length and water injection capability. The distal end of the delivery tube is fixedly connected to the I-blade body via a connecting tube, and the proximal end of the delivery tube is fixed to the main handle. The proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath tube, which is sleeved outside the delivery tube. The proximal end of the inner sheath tube is fixedly connected to the inner sheath handle, and the outer sheath tube is sleeved outside the inner sheath tube. The distal end of the outer sheath tube is limited by a ceramic head, and the proximal end of the outer sheath tube is fixedly connected to the outer sheath handle. The relative positions of the outer sheath handle and the main handle can be moved to adjust the overall blade extension length. The relative positions of the inner and outer sheath handles can also be moved to switch between the O-blade and I-blade functions. This solution can meet the surgeon's needs for different electrosurgical unit lengths during surgery and provide multiple functions in a single electrosurgical unit.

Disclosed is a thrombus extraction device (1) comprising: a rotating body (2) formed by a plurality of first longitudinal struts (20), wherein the first longitudinal struts (20) are fixed only at a proximal end (21) and a distal end (22), and the rotating body (2) is in an expanded configuration when the rotating body is in a free state, and is in a contracted configuration when the rotating body is inserted into a catheter; a distal body (3) connected to the distal end (22) of the rotating body (2), the distal body is in an expanded configuration when the distal body is in a free state, and is in a contracted configuration when the distal body is inserted into a catheter; wherein at least a portion of each first longitudinal strut (20) is radially expanded and circumferentially rotated during the unfolding stage of the rotating body (2) from the contracted configuration to the expanded configuration.

An implant tool system includes an implantable medical device. The implantable medical device includes a zone visual marker positioned on an exterior surface of the device. The zone visual marker includes a distal end of the zone visual marker. The distal end of the zone visual marker aligning with the proximal end of an introducer indicates when to withdraw the introducer. The zone visual marker further includes a proximal end of the zone visual marker. The proximal end of the zone visual marker aligning with the proximal end of the introducer indicates when to inflate a balloon carried by the device and affix the distal end of the implantable medical device to the target site via a fixation mechanism.

Described herein is a nasal airflow disruption apparatus, and method of use, comprising an elongate strip of flexible material having a central area extending between two distal ends. The central area comprises a narrow portion being defined by an elongate recess. The apparatus is configured such that when the strip is positioned across the bottom of a nose and the distal ends are secured to either side of the nose, the central area partially covers the nostrils and creates first and second airflow zones in each nostril. The first airflow zone is distal to the tip of the nose, allows unencumbered airflow into an out of the nostril and is created by the elongate recess. The second airflow zone is proximal to the tip of the nose, disrupts airflow into and out of the nostril and is covered by the narrow portion.

The utility model discloses an endoscope and clamp channel assembly thereof, the endoscope includes operating part and the insertion part of relatively operating part rotation, and the clamp channel assembly includes the clamp channel pipe and the clamp channel intercommunicating part for fixing in operating part, and the proximal end of clamp channel pipe is rotatably connected in the clamp channel intercommunicating part, and the distal end of clamp channel pipe is used for fixed connection with the distal end of insertion part, thereby, when insertion part rotates relative to operating part, the rotation of clamp channel pipe can follow insertion part and rotate relative to clamp channel intercommunicating part, therefore can avoid the knot of clamp channel pipe torsion, and then avoid the phenomenon of breakage and air leakage, so can effectively improve its service life.

The utility model relates to a cryoablation catheter with a supporting device, which comprises a sheath tube, an air inlet tube, an air return tube, a guide wire cavity tube, a bag body, the supporting device and a handle, the far end of the sheath tube is fixedly connected with the near end of the bag body, the near end of the sheath tube is fixedly connected with the handle, the far end of the bag body is fixedly connected with the far end of the guide wire cavity tube, and the bag body is fixedly connected with the handle. The supporting device is composed of an inner supporting piece and an outer supporting piece, the inner supporting piece is arranged in the bag body, the outer supporting piece is arranged outside the bag body, the supporting device is of a self-expanding structure, when the supporting device is converted from a compressed state to an expanded state, the inner supporting piece supports the inner wall of the bag body, and the outer supporting piece supports the outer wall of the bag body. The capsule body is tightly attached to a target area, the outer supporting piece is supported on the inner wall of a blood vessel, and a blood flow channel is established between the outer side of the capsule body and the inner wall of the blood vessel.

The present application relates to a delivery device and a delivery system, the delivery device comprising an inner sheath core, an outer sheath core, an outer sheath tube and a delivery handle, a restraint and a fixing anchor, the proximal ends of the inner sheath core, the outer sheath core and the outer sheath tube being connected to the delivery handle so as to be axially relatively movable under the adjustment of the delivery handle; the restraint being fixed to the distal end of the inner sheath core, and the fixing anchor being connected to the distal end of the outer sheath core so as to be at least partially inserted into the restraint when the inner sheath core and the outer sheath core are relatively axially moved; the fixing anchor comprising a main body and a plurality of anchor hooks, the outer wall of the main body forming a limiting groove at the proximal end side of each anchor hook; the delivery device of the present application radially compresses the wave pole of the bare stent through the restraint during the relative axial movement of the inner sheath core and the outer sheath core before the bare stent is separated from the anchor hook, so that the wave pole can be re-stored in the limiting groove, thereby driving the main body stent connected to the wave pole to be radially compressed, so as to adjust the shape and position of the covered stent during the release adjustment process.

The invention provides a blood vessel foreign body capturing device. The blood vessel foreign body capturing device comprises a guide wire, a first sleeve, a second sleeve and an outer sheath which are sequentially and coaxially arranged from inside to outside in a sleeving mode. The far end of the first sleeve is provided with an inflatable / contractible air bag; the far end of the second sleeve is provided with a sleeve device composed of a traction wire, an annular ring and a supporting rod, the two ends of the supporting rod are fixedly connected with the annular ring and the far end of the second sleeve respectively, the annular ring can be unfolded to be in a transverse state with the included angle formed between the annular ring and the axis of the blood vessel when pushed out, and the foreign matter parallel to or attached to the wall of the blood vessel can be taken out conveniently. The air bag is expanded and fixed at the far end of a foreign body in advance to prevent the foreign body from shifting, then the transversely-arranged snare is controlled to sleeve and hoop the foreign body, and finally the whole set of device is retracted into the outer sheath to be safely taken out, so that the technical problems that an existing snare is single in capturing angle and the foreign body is prone to shifting are solved.

This invention relates to the field of artificial ligament technology, specifically disclosing a method for securing the distal end of an artificial ligament. This method is mainly used for securing the traction suture to the distal fixation segment of the artificial ligament. The artificial ligament includes a free wire segment within the joint cavity, two braided segments located at both ends of the free wire segment, and two distal fixation segments located on opposite sides of the two braided segments. The fixation method mainly includes the following steps: placing the traction suture outside the distal fixation segment, and using a portion of the traction suture to create a covering portion, wherein the covering portion covers a portion of the two free strands of the traction suture outside the distal fixation segment. This invention ensures the structural integrity of the artificial ligament, the reliability of its function, and reduces the risk of inflammation in the patient.

The application provides a visual 360-degree adjustable bending catheter sheath, which comprises a tube assembly, a visual assembly, a plurality of traction wires and a plurality of operating members, the tube assembly comprises an inner tube, an outer tube and a plurality of containing tubes, the outer tube is wrapped outside the inner tube, a plurality of containing tubes are arranged between the outer tube and the inner tube, and the plurality of containing tubes are arranged in a circumferential interval around the inner tube; the visual assembly is arranged at the distal end of the tube assembly; each traction wire is contained in a containing tube; the operating members are arranged at the proximal end of the tube assembly; the distal end of each traction wire is fixed to the distal end of the tube assembly, and the proximal end of the traction wire is connected to one operating member; the operating members can be independently operated to make the distal end of the tube assembly bend by tensioning or releasing the corresponding traction wire, can provide a real-time intravascular field of view for an operator in an interventional operation, and has a multi-directional precise bending adjustment capability.

The invention belongs to the technical field of medical apparatuses and instruments, and particularly relates to an ablation device which comprises a tube assembly comprising a sheath tube, an inner tube and a spraying tube which are sequentially arranged from outside to inside; the ablation unit is fixedly connected with the far end of the inner tube, the ablation unit and the inner tube can move in the axial direction relative to the sheath tube, the ablation unit comprises a plurality of deformation units, and ablation electrodes are arranged on the deformation units; the positioning assembly can be expanded and contracted in the radial direction, the far end and the near end of the positioning assembly can get close to each other and get away from each other, the far end of the positioning assembly is connected with the spraying pipe, and the spraying pipe can axially move relative to the near end of the positioning assembly; in the first state, the ablation unit and the positioning assembly extend out of the far end of the sheath tube, the ablation unit is unfolded in a funnel shape, and meanwhile the positioning assembly is located in the ablation unit, unfolded in the radial direction and abuts against the inner wall of the ablation unit in the radial direction. According to the ablation electrode, the adherence degree of the ablation electrode and the targeted tissue can be enhanced, and the expected ablation effect is achieved.

The utility model relates to a novel pulmonary nodule positioning needle which comprises a puncture needle, a pushing device and a positioning device, and the puncture needle comprises a puncture needle tube and a puncture needle handle; the pushing device comprises a pushing handle and a pushing rod, and the pushing rod is of a hollow structure; the positioning device comprises an anchor hook and a positioning line, the anchor hook is fixedly connected with the far end of the positioning line, the anchor hook is pre-loaded in an inner cavity of the puncture needle tube, the positioning line is pre-loaded in an inner cavity of the pushing rod, the positioning line is composed of a near-end part and a far-end part, and the near-end part is fixedly connected with the far-end part. The hardness of the far end part is higher than that of the near end part. The pulmonary nodule positioning needle can prevent the positioning lines from being stacked and the buckle from falling off, and is easy to disassemble.

The invention provides an embolism spring coil system which comprises a conveying device and a spring coil, the conveying device comprises a conveying pipe and a guide wire arranged in the conveying pipe, the conveying pipe is provided with a cavity, the cavity comprises a first cavity body and a second cavity body located at the far end of the first cavity body, and the second cavity body is provided with a partition part to divide the second cavity body into a first channel and a second channel; the spring ring device comprises a spring ring and an anti-unwinding wire arranged in the spring ring, the far end of the anti-unwinding wire is fixedly connected with the far end of the spring ring, a rope sleeve is arranged at the near end of the anti-unwinding wire, the rope sleeve penetrates through the first channel and extends into the first cavity, and the guide wire sequentially penetrates through the rope sleeve and the second channel. The rope sleeve of the anti-unwinding wire penetrates through the first channel and is arranged on the guide wire in a sleeving mode, so that stable connection of the conveying device and the spring ring device is achieved, the locking state can be kept even if the conveying device passes through a bent blood vessel, the situation of mistaken unwinding is avoided, the surgical risk and the operation difficulty are reduced, and the working efficiency is improved. And meanwhile, the spring ring can be reliably released through the arrangement of the anti-unwinding wire.

Provided are an apparatus and method for use of same, the apparatus including a bendable body including a hollow extending a length thereof, with the hollow having a wall formed about at least a part thereof; and at least one support wire extending in the hollow. A distal end of the at least one support wire is anchored to the wall, with proximal portions of the at least one support wire being slideably situated in the hollow. At the proximal end of the bendable body, a proximal end of the at least one support wire is attached to at least one of a spring and a force controller. The at least one support wire provides a restoring force to prevent kinking of the bendable body.

The application relates to the field of medical devices, in particular to a heart implant, which comprises an anti-reflux prosthesis, a fixing member and a limiting member, the anti-reflux prosthesis is anchored on atrial tissue through the fixing member, one end of the limiting member is connected with the anti-reflux prosthesis, and the other end of the limiting member is fixed on apical tissue, the anti-reflux prosthesis comprises a closing aid and a barrier, the distal end of the barrier is fixed on the middle region of the closing aid, the proximal end of the barrier is connected with the limiting member, and the proximal end part of the closing aid is free; the application not only can increase the coaptation area with adjacent native leaflets to achieve ideal repair effect, but also can avoid the closing aid from floating into the atrium, and has good clinical significance.

The invention relates to a lead device that comprises a lead tip with a distal fixation helix for fixing the lead tip at a patient's tissue (e.g., cardiac tissue, in particular tissue of the septum) wherein the fixation helix comprises a cutting portion for cutting the tissue in a circumferential direction of the fixation helix, in addition to a puncturing by a distal tip of the fixation helix (30), when the fixation helix is screwed into the tissue, to support longitudinal insertion of the lead tip with the fixation helix into the tissue. Thereby, insertion and longitudinal advancement of the lead tip into the tissue can be facilitated and smoothened due to a pre-cutting of the tissue in a circumferential direction at and / or around and / or within the fixation helix during the screwing operation into the tissue.

The vertebral plate rongeur comprises a fixed rongeur body, a movable rongeur body and a handle assembly driving the movable rongeur body to slide on the fixed rongeur body. The movable clamp body comprises a clamp body sleeve with an internal channel, a drill rod penetrating through the clamp body sleeve, a bone grinding drill bit fixed to the far end of the drill rod, and a driving device connected with the near end of the drill rod; a part of the bone grinding drill bit is exposed outwards from the far-end opening of the forceps body sleeve; the driving device is used for driving the drill rod and the bone grinding drill to rotate; one end of the negative pressure drainage tube is communicated with an internal channel of the forceps body sleeve, the other end of the negative pressure drainage tube is connected with a suction device, and a through hole for sucking bone scraps into the forceps body sleeve is formed in the far end of the forceps body sleeve. In the operation process, the driving device drives the bone grinding drill bit to rotate through the drill rod, the bone grinding drill bit grinds bone tissue in the rotating process, bone scraps generated by grinding are sucked out of the body through the forceps body sleeve and the negative pressure drainage tube, a surgeon can operate continuously, operation time is shortened, and tissue wounds are reduced.

The invention discloses a thoracocentesis drainage device. Comprising a puncture assembly, a fixing disc and a drainage tube, and the puncture assembly, the fixing disc and the drainage tube are detachably connected; the puncture assembly comprises a handle, a puncture rod connected with the handle in a sliding mode and a puncture head located at the far end of the puncture rod. The fixing disc comprises an annular piece, an inner sleeve, an outer sleeve, a shell, a flexible sealing ring and a deformation sleeve, the inner sleeve is used for allowing a puncture rod or a drainage tube to penetrate through, the outer sleeve and the deformation sleeve are arranged outside the inner sleeve in a sleeving mode, and the two ends of the deformation sleeve are fixed to the far end of the inner sleeve and the far end of the outer sleeve respectively; the outer sleeve is divided into a fixing part located at the near end and an extending part located at the far end, and the annular piece is arranged outside the fixing part of the outer sleeve in a sleeving mode and is rotationally connected with the outer sleeve; the flexible sealing ring is arranged between the outer edge of the near end of the annular piece and the inner edge of the near end of the outer sleeve in a sleeved mode. The device is easy and convenient to operate, reliable in fixation and good in sealing effect, and operation safety and efficiency are improved.

The invention provides an intravascular stent and a stent system, and relates to the technical field of medical instruments. According to the intravascular stent, the stent can be dynamically and continuously adjusted in vivo, the controllability of an operation can be improved, the stent can be quickly and conveniently recycled, and the difficulty of the operation can be reduced. The intravascular stent comprises a pushing assembly, a stent body and a traction assembly. Wherein at least one part of the support spirally extends in the axial direction of the pushing assembly, the pushing assembly is sleeved with the support, the far end of the support is fixed to the far end of the pushing assembly, and the near end of the support is slidably connected with the pushing assembly; the traction assembly is connected with the near end of the support. In the axial direction of the support, the traction assembly drives the near end of the support to move towards the near end of the pushing assembly, and the outer diameter of the support is reduced.

A tension-strengthening device for increasing the tensile strength of the distal tip of a medical device while maintaining sufficient flexibility for the medical device to pass through curved anatomical structures. The tension-strengthening device may include a base member and a wire wound around the base member to form a coil. The distal end of the tension-strengthening device may include an adhesive that obtuses the end of the tension-strengthening device to prevent puncture and secures the distal end of the coil to the base member. The base member may be largely omitted, with the distal length of the wire forming the coil extending in the opposite direction through the inner diameter of the coil and functioning as the base member. A stopper may be positioned at the proximal end of the tension-strengthening device to form an interference lock with the medical device.