RU2014032C1 - Needle locking device - Google Patents

Abstract

FIELD: medical engineering. SUBSTANCE: device has a threaded rod and a nut and an additional nut mounted on it with a washer positioned in between. The additional nut has a clutch on the side of its contact surface. The washer is made with a slot no more than the rod diameter, and its hole diameter is no more than the sum of outer diameters of the clutch and the fixed needles. EFFECT: improved structure. 4 dwg

Description

 The invention relates to medicine / namely to traumatology and orthopedics, and is intended for fixing the spokes to compression-distraction devices.

 Known special fixators / which are installed on the threaded supports of compression-distraction apparatuses. They are designed to strengthen the knitting needles / performed in the calculation of the fixed position of the bone fragment relative to the external support and carried out perpendicular to the threaded rod of the frames (ed. St. USSR N 1616642/1616640 / N935093). The spacers of the listed devices are not designed to hold spokes at an angle or spokes / having a thrust pad. They are large-sized (auth. St. USSR N 935093) or are limitedly convenient to use.

 More simplified versions of special fixators are known (ed. St. USSR N 1496787) in the form of a pair of nuts / having grooves for knitting needles / as well as washers with side grooves for knitting needles from the set for transosseous osteosynthesis according to Ilizarov. These special fixators distinguish unreliable fastening and the impossibility of dosed movement along the rod with the spoke.

 Closest to the proposed technical solution is the spoke fixator of the previous model. It contains a threaded rod / nut / additional nut and washer between the nuts / the diameter of the washer hole is not more than the sum of the diameters of the rod and spokes / and the contact surfaces of the nuts and washers are equal.

 However, this spoke fixer is not designed to use spokes with a thrust pad / if these needles must be carried out already after / the frame of the external fixation apparatus is already mounted on the previously made spokes - the washer hole does not allow the thrust pad to pass through. I had to bite the rim of the washer / unbend it / significantly while deforming. When using it, the needles rest against the combs of the threaded cutting of the rods / therefore, when moving the spokes in the washer due to the parallel rotation of both nuts along the rod, thread damage was observed / which limited the possibility in some cases to reuse them. It is possible / that the spokes in this case undergo mechanical deformation and lose strength properties. But the greatest inconvenience was experienced / if it was necessary to draw the needle not through the hole of the washer / outside it / using the telescopic direction of the drill in those areas of the limb / where tactile sensations with the hand are necessary when holding the needles - these feelings are suppressed when using the washer as a guide. In such cases, it is very difficult to retrograde the shank of the knitting needle. A removable washer turned out to be more advantageous in such situations. In connection with the foregoing, the prototype spoke-fixator is a “stabilizing” / but limitedly reversing device.

 The purpose of the invention is the provision of reposition of bones in the plane of the spokes.

 Achieving the goal is ensured by the fact that the contact surface of the washer is made with an opening / the size of which does not exceed the diameter of the threaded rod / the additional nut on the side of the contact surface of the washer has a sleeve to accommodate the washer with the spokes missing in its hole / and the diameter of the washer hole is not more than the sum coupling diameters and fixed knitting needles.

 In FIG. 1 shows a special fixator in a lateral projection; in FIG. 2 - washer; in FIG. 3 - general view of the spoke fixator; in FIG. 4 - special fixator in working condition.

 The specifier includes a nut 1 / threaded rod 2 / washer in the form of a collar 3 and an additional nut 4. The contact surface of the washer 3 has an opening 5 in the form of a sector of its rim / and the additional nut 4 on the side of the washer is equipped with a sleeve 6 to accommodate washers and in its hole 7, one or a pair of knitting needles 8 / 9. The transverse dimension of the opening 5 is less than the diameter of the hole 7 by the thickness of the sleeve 6 /, which ensures a firm installation of the washer 3 on the sleeve of the additional nut 4 and isolation of the needles 8/9 from the threaded rod 2.

 The specifier is used as follows. On the frame of the compression-distraction apparatus / assembled before the operation in the places of the supposed strengthening of the needles /, the nut 1 and the additional nut 4 / the coupling of which 6 is turned towards the nut 1 are screwed onto the threaded rods. The washer 3 can be put on the coupling in advance / and the nuts are maximally screwed between to the stop with the coupling in the nut 1. An electric drill is used to cross-cut the spoke in the plane of the threaded rod of the frame or screed of the frame / at the same time optimally / if the direction of the spoke coincides with the plane of the coupling 6. The nuts are disconnected / the washer is removed from the clutch and it is grasped with a yoke 8 or two spokes 8 and 9 using a collar. The washer 3 is put with an aperture 5 on the threaded rod 2 and, together with the spokes, the hole 7 with 8/9 spokes are pushed onto the clutch 6 of the nut 4 / a nut 1 first with your hand / and then screw it onto the sleeve 6 with a wrench. Holding the nut 1 with the wrench / use a second wrench to compress between the nuts / while simultaneously tensioning the spokes / since the spokes / bayonet-shaped deforming / firmly engage the edges of the washer rim and when one of the nuts rotates, ahead of the other n are being pulled. Bone fragments or limb segments are repositioned using knitting needles in a compression-distraction apparatus by simultaneously rotating the 1/4 nuts in the direction / opposite to the direction of displacement / completing this process with an additional counter approach of the nuts / fixing of the achieved position. Removing and replacing the spokes is done by disconnecting the nuts / removing the washer together with the knitting needle (or knitting needles) from the threaded rod, followed by manipulations (removing the knitting needles from the bone or remounting the frame of the apparatus / or re-mounting the knitting needles) / provided by the treatment program.

 Thus, the spoke fixer ensures the achievement of the goal without compromising the mechanical characteristics of the carcass elements (damage to the thread / kink of the knitting needles / washer after biting it) and with the possibility of unhindered use of repositioning knitting needles with a thrust pad and ordinary knitting needles. In this case, the way of carrying the knitting needles does not play a significant role - after strengthening the frame of the device on previously held knitting needles or after partially assembling it in the operating room and subsequent installation. The specifier has all the technical capabilities of the prototype and can be used as stabilizing on any threaded base in the form of a rod of standard diameter of the most famous frame devices or Ilizarov ring apparatus.

 Clinical trials on the proposed compression-distraction apparatuses / on their modifications / on the Ilizarov apparatus / on combined hardware frames over the past 2 years have confirmed the reliability and ease of use of the new special fixators in comparison with many well-known models / and they were made in the mechanical locksmith workshop of the institute . Separate elements of the special fixator can be purchased through the distribution network of consumer goods (meaning crown nuts / washers / threaded rods). New special fixators have a minimum weight / do not interfere with the reading of X-ray diffraction patterns / are resistant to mechanical stresses and therefore can be successfully used in the treatment of patients with pathology of the musculoskeletal system by compression-distraction osteosynthesis.

Claims (1)

 SPICEFICATOR containing a threaded rod and a nut, washer and additional nut sequentially installed on it, characterized in that the additional nut is made from the side of its contact surface with the coupling, and the washer is made with a slot, the size of which is not larger than the diameter of the rod, and the diameter of the hole is not larger the sum of the outer diameters of the coupling and the fixed spokes.

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