CN2598693Y

CN2598693Y - Bone fracture fixing threading drill and its matched threading nail

Info

Publication number: CN2598693Y
Application number: CNU02274570XU
Authority: CN
Inventors: 苏继承; 贾洪伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-06
Filing date: 2002-08-06
Publication date: 2004-01-14
Anticipated expiration: 2012-08-06

Abstract

The utility model discloses a bone fracture fixing threading drill and the matched threading nail. The utility model is characterized in that tap drilling head is integrated to the screwed thread of the tap to form a whole body; the tap drilling head and the screwed thread are all provided with trisect spire chip-discharging grooves; the outer diameter of the drilling head is provided with a transition taper of 1.5-2 screw pitch at the part connected to the screwed thread; the main edge of tap drilling head can be divided into two angles; the point angle is ninety to one hundred degree, the angle of the main edge rear part is one hundred and eighteen to one hundred and twenty degree; the outer diameter of the screwed thread of the tap drilling head d is 1.5-6.5 mm; the teeth height is n<1> 0.25-0.7 mm; the screw pitch t is 0.6-3 mm. the angle of tooth alpha is twenty nine degree to forty two degree; the inclined angle of the work face alpha<1> 4 degree to 12 degree; the transition arc of the inclined angle of not-working face to the root diameter of the screwed thread R is 0.3 mm-1.5 mm; the transition arc of the inclined angle of the work face to the root diameter of the screwed thread r is 0.15-0.8 mm; the top width of the teeth is 0.08-0.1 mm. The screwed pin or nail or hollow screwed pin or nail match to the tap drilling head. The utility model is characterized in that the drilling head and the screwed thread are all provided with trisect spire chip-discharging grooves, the chip-discharging effect, and the mechanics performance of anti-torque anti-bending are better than straight grooves.

Description

The drive screw of fracture fixation threading drill bit and coupling thereof (pin)

Relate to field this utility model and relate to the orthopedic medical device technical field, especially the drive screw of fracture fixation threading drill bit and coupling thereof (pin).

Background technology drive screw (pin) is to use one of fixed apparatus maximum, widest in area in the bone fixation compromise.And screw tap is to storm and capture a hole necessary tool earlier for screw thread is screwed into.At present, the program of using drive screw (pin) in fracture in the medical treatment is, fixed point, bores pilot hole, and the screw tap that changes the outfit again is screwed into drive screw (pin) then along the pilot hole tapping.In the past, when using drive screw (pin) to carry out fracture fixation, the operation sequence complexity had prolonged the time of operation; Have again in threaded portion tail end and most advanced and sophisticated external diameter than excessive, cause screw thread unstable in sclerotin.

The summary of the invention the purpose of this utility model provides the drive screw (pin) of a kind of fracture fixation threading drill bit and coupling thereof, the disposable task of finishing boring, tapping of this threading drill bit, reach the screw (pin) that is mated with threading drill bit, the improvement of thread taper, angle of thread has strengthened the hold of screw (pin) and the power of holding of sclerotin.

The fracture fixation threading drill bit is characterized in that: the silking of threading drill bit and screw tap is the overall structure of same axis; Threading drill bit and silking are equipped with the trisection helical flute, and the bit head external diameter of threading drill bit and silking junction are provided with the excessive taper of 1.5-2 pitch length; Threading drill bit portion major cutting edge is divided into two kinds of angles, and the tip angle is that 90-100 ° of major cutting edge afterbody is 118-120 °; The major diameter of thread d 1.5-6.5mm of threading drill bit, thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 °-42 ° of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f 0.08-0.1mm of crest.

Drive screw that is complementary or pin or hollow nail or pin hollow nail is characterized in that: the large and small external diameter in its threaded portion is taper in 1: 100 or taper in 1: 150, and the 1/2 place's external diameter of reach and the screw tap external diameter of threading drill bit are equal to; The reach of drive screw (pin) is divided into the long and short two kind, is provided with the trisection cutting blade in the tip of long screw thread; Non-hollow screw group (pin) tip is 120 degree, and spike is flat shape; The major diameter of thread d 1.5-6.5mm of drive screw (pin) or hollow screw group (pin), thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 °-42 ° of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f 0.08-0.1mm of crest.

Characteristics of the present utility model are: drill bit and silking all have the trisection helical flute, and its chip removal effect and mechanical property antitorque, bending resistance are better than straight shape groove; The cross section of spiral type chip area is stressed circular in the shape of a spiral stressed, and it is antitorque, bending strength good; Boring, tapping are carried out simultaneously, have avoided boring back tapping offset axis, and other wards off new footpath; Reduce the more time of bit change, screw tap.

Description of drawings

Fig. 1 is the front view of fracture fixation threading drill bit.

Fig. 2 is a fracture fixation threading drill bit threaded portion enlarged drawing.

Fig. 3 is the front view of fracture fixation drive screw or pin.

Fig. 4 is the screw thread tip figure of fracture fixation drive screw or pin.

Fig. 5 is the long screw thread tip trisection cutting blade front view of fracture fixation drive screw or pin.

Fig. 6 is the long screw thread tip trisection cutting blade left view of fracture fixation drive screw or pin.

The specific embodiment

Embodiment 1

Fracture fixation threading drill bit (see figure 1), the silking of threading drill bit and screw tap are the overall structure of same axis; Threading drill bit and silking are equipped with the trisection helical flute, and the bit head external diameter of threading drill bit and silking junction are provided with the excessive taper of 1.5-2 pitch length; Threading drill bit portion major cutting edge is divided into two kinds of angles, and the tip angle is that 90-100 ° of major cutting edge afterbody is 118-120 °; The major diameter of thread d 1.5-6.5mm of threading drill bit, thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 ° of-42 ° of (see figure 2)s of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f0.08-0.1mm of crest.

The drive screw (see figure 3) that is complementary, its head has nut, and its threaded portion tail end and most advanced and sophisticated external diameter tapering are taper in 1: 100 or taper in 1: 150, and the 1/2 place's external diameter of reach and the screw tap external diameter of threading drill bit are equal to; The reach of drive screw is divided into the long and short two kind, is provided with trisection cutting blade (see figure 4) in the tip of long screw thread; Non-hollow screw group tip is 120 degree (seeing Fig. 5,6), and spike is flat shape; The major diameter of thread d 1.5-6.5mm of drive screw or hollow screw group, thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 °-42 ° of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f 0.08-0.1mm of crest.

Embodiment 2

Its head of the screw needle that is complementary does not have nut, and all the other are with embodiment 1.Its head of the hollow screw group that embodiment 3 is complementary is provided with nut, and all the other are with embodiment 1.

Its head of hollow thread pin that embodiment 4 is complementary does not have nut, and all the other are with embodiment 1.

Claims

1, fracture fixation threading drill bit is characterized in that: the silking of threading drill bit and screw tap is the overall structure of same axis; Threading drill bit and silking are equipped with the trisection helical flute, and the bit head external diameter of threading drill bit and silking junction are provided with the excessive taper of 1.5-2 pitch length; Threading drill bit portion major cutting edge is divided into two kinds of angles, and the tip angle is that 90-100 ° of major cutting edge afterbody is 118-120 °; The major diameter of thread d 1.5-6.5mm of threading drill bit, thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 °-42 ° of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f 0.08-0.1mm of crest.

2, drive screw or pin or hollow screw group or the hollow thread pin that is complementary with the fracture fixation threading drill bit, it is characterized in that: its threaded portion tail end and most advanced and sophisticated external diameter tapering are taper in 1: 100, and the 1/2 place's external diameter of reach and the screw tap external diameter of threading drill bit are equal to; The reach of drive screw or pin is divided into the long and short two kind, is provided with the trisection cutting blade in the tip of long screw thread; Non-hollow screw group or needle tip are 120 degree, and spike is flat shape; The major diameter of thread d 1.5-6.5mm of drive screw or pin or hollow screw group or pin, thread form height n ₁0.25-0.7mm, pitch t 0.6-3mm, 29 °-42 ° of angle of thread α, work surface oblique angle α ₁4 °-12 °, the transition arc R 0.3-1.5mm of non-working surface oblique angle and core diameter of thread, the transition arc r 0.15-0.8mm of work surface oblique angle and core diameter of thread, the wide f 0.08-0.1mm of crest.

3, drive screw that is complementary according to claim 2 or pin or hollow screw group or hollow thread pin is characterized in that: its threaded portion tail end and most advanced and sophisticated external diameter tapering are 1: 150.