Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M37/00—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin
  • A61M37/0069—Devices for implanting pellets, e.g. markers or solid medicaments
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/34—Trocars; Puncturing needles
  • A61B17/3403—Needle locating or guiding means
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/34—Trocars; Puncturing needles
  • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
  • A61B17/3421—Cannulas
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/34—Trocars; Puncturing needles
  • A61B17/3468—Trocars; Puncturing needles for implanting or removing devices, e.g. prostheses, implants, seeds, wires
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/34—Trocars; Puncturing needles
  • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
  • A61B17/3421—Cannulas
  • A61B2017/3433—Cannulas with different outer diameters of the cannula
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/34—Trocars; Puncturing needles
  • A61B2017/347—Locking means, e.g. for locking instrument in cannula

Definitions

• the invention relates to a cannula having a cannula tip ground at the distal end, and a cannula holder holding the cannula at the proximal end and a stylet displaceable in the cannula from an initial position to an end position, the distal end of which projects beyond the cannula tip in the end position at a distance, and wherein the stylet is fixed in position in the end position while covering the ground cannula tip.
• a cannula of the aforementioned type is known from WO-A-01/68168.
• a sleeve-shaped protective element is provided, which is displaceable relative to the longitudinal direction of the cannula and from which a stylet extends, in order to be able to deposit an element present in the cannula.
• the cannula tip is covered by the protective element, with the stylet protruding beyond the tip.
• the stylet itself is based on the sleeve-shaped protective element.
• EP 0 574 434 B1 discloses a cannula in which the cannula tip is covered after use with a protective cap, preferably in the form of a unilateral open hollow cylinder.
• a protective cap preferably in the form of a unilateral open hollow cylinder.
• the present invention is u. a. the object of developing a cannula for depositing an element of the type mentioned in such a way that a simple and reliable protection of the cannula tip and a locking of the stylet after use of the cannula, in particular after removal of an element is guaranteed.
• the element when at least one element is to be deposited by means of the cannula, the element can be disposed in an accident-proof manner in the cannula or in an applicator having it.
• a further aspect is intended to make it possible for a second element to remain safely in the cannula after the application of a first element and not to be unintentionally released with it.
• one aspect aims to ensure a secure fixation of the stylet in a starting position.
• At least one of the aspects in particular that which is intended to provide simple and reliable protection of the cannula tip and protection against injury after use of the cannula, is essentially achieved by fixing the stylet by interacting with the ground cannula tip or by locking in the cannula holder is.
• the position fixing is not non-destructively solvable, i. inseparable under normal use.
• the stylet If the stylet is fixed in position by interacting with the ground cannula tip, it can penetrate into the stylet, in particular when retracting the stylet from its end position.
• a further preferred embodiment is characterized in that the stylet has a cross-sectional widening in its distal end such that, when the stylet is applied to the inner surface of the ground cannula tip, a peripheral edge extends radially outwardly beyond the cannula tip.
• the stylet has an outer diameter which is smaller than the inner diameter of the cannula that the cross-sectional widening has an outer diameter corresponding to the inner diameter of the cannula, wherein the distal end of the mandrel has a cylindrical surface, that is a cylinder geometry and wherein the cannula tip is bent inwardly in the direction of the longitudinal axis of the cannula, that the cannula tip at the transition of the peripheral edge formed by the sections of different diameters, which limits the cross-sectional widening and the cylindrical surface rests fixed in position while covering the ground cannula tip.
• a further embodiment is characterized in that the distal end of the stylet has a conical surface, ie a cone geometry, wherein the conical surface extends from a first diameter, which substantially corresponds to an inner diameter of the cannula, to a second diameter, which is smaller as the inner diameter, wherein the cannula tip in the region of a rear sipe has a projection extending in the direction of the longitudinal axis, which abuts against the conical surface and presses against the inner surface of the cannula tip, wherein the cannula tip is fixed in position on the peripheral edge of the cross-sectional widening.
• the cross-sectional widening corresponds in section to a circular section, starting from the chord of the cylindrical or conical portion of the stylet.
• the cannula tip may have an undercut facet.
• the stylet has a latching element such as latching hook, which is inextricably latched in an undercut formed in the cannula holder or in a recess of the cannula holder or a similar element in the end position of the stylet.
• a latching element such as latching hook
• the end of the stylet protrudes at a distance (A) beyond the cannula tip, wherein the distance
• an end portion of the stylet may be conical, with the conical portion extending from a diameter substantially equal to the inner diameter of the cannula to a diameter smaller than the inner diameter, and the stylet having a distal end Outer diameter corresponds to the inner diameter of the cannula.
• the cannula tip has in the region of the rear sipe eye in the direction of a longitudinal axis of the cannula inwardly directed indentation, which rests in the end position of the mandrel on the surface of the end portion having a cone shape, so that the end portion of the Inner wall of the cannula is applied.
• the cannula tip may have an undercut facet.
• Fig. 1 is a sectional view of a first embodiment
• Fig. 2 is a sectional view of the applicator of FIG. 1, wherein the
• Cannula is completely retracted to the stylet
• FIG. 3 is a sectional view of a first embodiment of a Mandrin- end cannula tip assembly, a sectional view of a second embodiment of a stylet end cannula tip assembly, a sectional view of a third embodiment of a latch between a stylet tip and a cannula tip, a sectional view of a second embodiment of an applicator with a cannula with implants and a translatable stylet in the starting position, an applicator according to FIG.
• FIG. 6 shows a fully retracted cannula, a fourth embodiment of a stylet end cannula tip assembly, a fifth embodiment of a stylet end cannula tip assembly, and a side view of the facetted cannula tip and a cross sectional view of a cannula tip cross section.
• Fig. 1 shows a sectional view of a first embodiment of an applicator 10, comprising a cannula 12 with ground at the front, ie distal end tip 14 and at the rear, ie proximal end of the cannula 12 holding the cannula holder 16.
• the applicator 10 can with two elements such as implants 18, 20 be filled or loaded with implants by hand.
• the implants 18, 20 are in the cannula 12 safely fixed and can be stored by means of a displaceably arranged in the cannula 12 Mandrins 22 in a tissue, not shown.
• the cannula 12 In the unused state shown in FIG. 1, the cannula 12 is in a defined starting position, wherein one end 24 of the stylet 22 rests against the second implant 18. In the starting position, the cannula 12 bears with an end face 26 of the cannula holder 16 against a first projection, such as stop 28, which extends perpendicular to the longitudinal extension of the stylet. As a result, the starting position is defined, in which it is prevented that the implants 18, 20 are ejected by mistake.
• a second stop 30 is arranged at a distance which corresponds approximately to a length of the first implant 20.
• the second stop 30 forms a stop as soon as the first implant 20 is released.
• the stops 28, 30 are arranged so that they easily z. B. can be canceled with a finger. For this purpose, they preferably have a predetermined breaking point.
• Fig. 2 shows the applicator 10 in a used state with the implants 18, 20 exposed.
• an end face 34 of a handle 36 of the stylet 22 bears against the end face 26 of the cannula holder 16.
• the end 24 of the stylet 22 protrudes beyond the cannula tip 14.
• the applicator 10 is characterized in that the stylet 22 is locked inextricably in the cannula 12 after application of the second applicator 18 and at the same time the cannula tip 14 is reliably protected.
• Fig. 3 shows an enlarged view of the cannula tip 14 at a distance A projecting end 24 of the stylet 22, whereby the tip 14 is covered.
• the end 24 of the mandrel 22 is substantially cylindrical in shape and has a diameter DM which substantially corresponds to the inner diameter DI of the cannula 12.
• the cannula tip 14 can alternatively have an inner facet cut or, as shown in FIG. 3, an undercut facet 38.
• the recess or the undercut 42 may be formed in the cannula holder 16 as an opening 44 extending transversely to the longitudinal extent of an opening 46 receiving the mandrin 22.
• the latching hook 40 spreads into the undercut 42 and thus ensures an indissoluble locking of the stylet 22 in the cannula 12.
• FIG. 4 shows a further embodiment of an end 48 of the mandrel 22, which is of conical design, and tapers from a diameter D1, which essentially corresponds to the inner diameter DI of the cannula, to a diameter D2. Also in this embodiment, the end 48 of the stylet 22 extends at a distance A beyond the distal end, that is, the tip 50 of the cannula 12.
• the tip 50 of the cannula 12 in the region of a rear sipe 52 has a projecting in the direction of the longitudinal axis 54 of the cannula 12 projection 56 which rests with its end portion 58 on the facing surface portion 60 of the conically shaped end 48 and presses against it so that the opposite surface portion 62 of the conical end 48 is urged against the inner wall 64 of the cannula.
• the cannula tip 50 has an undercut facet 65 which engages the surface 62 of the conical end 48 for locking it.
• the stylet 22 may also be formed in this embodiment with a latching hook 40, which engages in the recess as the undercut 42 of the cannula holder 16.
• Fig. 5 shows a third embodiment of a cannula tip 66, which is bent inwardly in the direction of a longitudinal axis 68 of the cannula 12.
• an end 72 of the stylet 22 projecting beyond the distal end 70 of the tip 66 is fixed as the tip 66 presses into the surface 74 of the end 72.
• the end 72 of the mandrel 22 is cylindrical and has a diameter which substantially corresponds to the inner diameter of the cannula 12.
• at least the end 72 of the mandrel 22 should be made of a thermoplastic material such as polypropylene (PP), polystyrene (PS) so that the tip 66 can press into the surface 74.
• PP polypropylene
• PS polystyrene
• the tip 66 has an undercut facet 74, although such an embodiment can also be realized with a conventional tip with an inner facet.
• 6 to 9 show embodiments in which a protection of the cannula tip and a fixation of the stylet within the cannula is ensured solely by the execution of the cannula tip in connection with the execution of the end of the stylet.
• FIG. 6 shows a sectional view of an applicator 76, comprising a cannula 78 with a tip 80 and with elements 18, 20 to be implanted.
• a stylet 82 is displaceably arranged, comprising a distal end 84, which in the initial position shown on FIG rear element 18 abuts.
• the stylet 82 has a punctiform cross-sectional widening 88, such as a circumferential rib.
• the cross-sectional widening 88 is frictionally engaged in the starting position shown in FIG. 6 on a wall of a mandrel 82 receiving Through opening or guide 86 of a cannula holder 90 at.
• the guide 86 opens into a recess as in an undercut 92. Thereafter, the cross section of the guide 86 widens in the further course to the cannula 78, so that after overcoming the resistance formed by the punctiform cross-sectional widening 86, the stylet 82 can move freely st.
• FIG. 7 shows a sectional view of the applicator 76 in its end position, in which the stylet 82 is latched with its end 84 to the cannula tip 80.
• Fig. 8 shows the embodiment of the tip 80 in an enlarged view. This is bent inwardly in the direction of the longitudinal axis 92 of the cannula 78, so that it rests against a cylindrical surface 96 of the end 84 of the mandrel 82.
• the end 84 of the stylet 82 additionally has a preferably mushroom-shaped cross-sectional widening 98, with an outer diameter DA which corresponds to the inner diameter DI of the cannula.
• the stylet 82 outside the cross-sectional enlargement 98 has a diameter DM which is smaller than the inner diameter DI of the cannula 78. Further, a clear distance between a surface 100 of the cannula tip 80 and an inner inner surface 102 of the aft bevel corresponds to the diameter DM of the stylet 82 so that the cannula tip 80 retracts the stylet 82 against a circumferential edge 104 between the circumferential cylindrical surface 96 and the mushroom-shaped cross-sectional enlargement 98 abuts, so that a locking of the mandrel 82 takes place and thus protection of the cannula tip 80 is achieved.
• FIG. 9 shows an embodiment of the cannula 78 with a straight cannula tip 106, ie parallel to the longitudinal axis 114, wherein the distal end 108 of the stylet 82 is conical, that is to say of a diameter D1 substantially corresponding to the inner diameter DI of the cannula 78 , tapered to a diameter D2, and then expanded to a diameter D2 Cross-section extension 110 to pass, which is preferably mushroom-shaped and has a maximum diameter DA, which corresponds to the inner diameter of the cannula 78.
• a projection 116 bent inwards in the direction of the longitudinal axis 114 of the cannula 78 is provided which abuts against the conical surface 118 of the distal end 108 of the stylet 82 in order to urge the stylet 82 against the inner surface 120 of FIG Needle tip 106 is subjected to force.
• the cannula tip 106 bears against the peripheral edge bounding the cross-sectional widening 110.
• the cannula tip 106 is provided with an undercut 124.
• Figs. 10a), 10b One possible embodiment of the backcut 38, 66, 124 is shown in Figs. 10a), 10b).
• the cannula tip 106 lies in a plane spanned by the inner wall 120 of the cannula 78, so that the cannula tip 106 rests on the one hand on the surface of the stylet 82 and on the other hand on the peripheral edge 122 and thus fixes the stylet 82.
• the angle ⁇ can be in the range of 8 0 ⁇ ⁇ 20 °, the angle ⁇ in the range of 20 0 ⁇ ⁇ 60 0 and the angle ⁇ in the range of 20 0 ⁇ ⁇ 120 0 lie.
• the figures are self-explanatory. It can be seen from FIGS. 10 a and 10 b that the end faces of the cut have an angle ⁇ , the plane spanned by the distal end face of the cannula and the longitudinal axis an angle ⁇ and the outside surface of the cut in a plane in which the intersection of the end faces and the longitudinal axis extends, and the longitudinal axis include an angle ß.
• the applicator 10 is used as follows.
• the pre-loaded with the implants 18, 20 cannula 12 is removed from a package. If necessary, a needle guard is removed. After preparation of a puncture, the cannula is pushed under the skin to a proximal mark. Then at the same time Holding the stylet 22, the cannula 12 with the needle holder 16 is pulled back to the stop 32. Thus, the first implant 20 is released. Subsequently, the cannula 12 is withdrawn to the distal mark. By the slightly inwardly bent tip 14 ensures that while the second implant 18 can not slip out. After retraction, the cannula 12 is advanced again at an offset angle.
• the stylet 22 can not move because it is prevented by the stop 30.
• the stop 30 is broken off and the cannula 12 is pulled back completely against the mandrin attachment 34. There he locks inextricably.
• the tip 14 is protected by the specially designed end of the stylet.

Landscapes

• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Surgery (AREA)
• Medical Informatics (AREA)
• General Health & Medical Sciences (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Veterinary Medicine (AREA)
• Public Health (AREA)
• Animal Behavior & Ethology (AREA)
• Pathology (AREA)
• Molecular Biology (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Dermatology (AREA)
• Anesthesiology (AREA)
• Hematology (AREA)
• Surgical Instruments (AREA)
• Media Introduction/Drainage Providing Device (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48191003

Family Applications (1)

Country Status (7)

Families Citing this family (11)

Family Cites Families (7)

• 2012
  • 2012-05-09 DE DE201210104058 patent/DE102012104058A1/de not_active Ceased
• 2013
  • 2013-04-30 EP EP13719129.2A patent/EP2809398A1/de not_active Withdrawn
  • 2013-04-30 US US14/399,665 patent/US20150105719A1/en not_active Abandoned
  • 2013-04-30 CN CN201380024972.8A patent/CN104582792A/zh active Pending
  • 2013-04-30 AP AP2014008077A patent/AP2014008077A0/xx unknown
  • 2013-04-30 WO PCT/EP2013/059031 patent/WO2013167431A1/de active Application Filing
• 2014
  • 2014-12-08 ZA ZA2014/08951A patent/ZA201408951B/en unknown

Also Published As

Similar Documents

Legal Events