CN205626001U

CN205626001U - Medical anchor

Info

Publication number: CN205626001U
Application number: CN201620291299.5U
Authority: CN
Inventors: 王大为
Original assignee: Beijing Realong Tyco Medical Instrument Ltd Co
Current assignee: Beijing Realong Tyco Medical Instrument Ltd Co
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2016-10-12
Anticipated expiration: 2026-04-08

Abstract

The utility model provides a medical anchor, this medical anchor have a toper nail body, the nail is formed with a set of main screw thread on one's body, a serial communication port, the nail still is formed with the same inferior screw thread of helical pitch a set of and main screw thread at least on one's body, and adjacent inferior ridge and the pitch between the main ridge are less than main flight lead, and the tooth higher primary school of inferior ridge is high in the tooth of the main ridge rather than adjacent. The utility model discloses a medical anchor can further extrude bone way sclerotin on every side when being used for bone surgery, sclerotin density around the reinforcing, and then strengthen anti pulling force.

Description

Medical holdfast

Technical field

This utility model relates to the apparatus of medical operation, is particularly used for the anchor of bone surgery Nail.

Background technology

In bone surgery, soft tissue, ligament etc. and bone surface are reconnected and typically requires use doctor With holdfast, this medical holdfast can be made up of titanium alloy, coordinates high intensity suture and change in operation process Coning is exercised and is used.Generally, the nail of this holdfast as cone shape, is formed with screw thread, anchor with nail The nail tail of nail can be hexagonal configuration, and nail tail is provided with a string holes and passes for high intensity suture, outside nail tail Edge and screwdriver internal orifice form fit the screwdriver mouth that submerges, in order to holdfast is screwed in sclerotin and by holdfast Back-out.

In this conventional design, being provided only with one group of screw thread with the nail of holdfast, such holdfast is followed closely Sclerotin around bone road is extruded limited by body and screw thread, and anti-traction force is low, and the screw thread of this type of holdfast produces Extruding force as shown in Figure 7.

Utility model content

For disadvantages mentioned above of the prior art, the purpose of this utility model is that offer one can Increase the medical holdfast of the improvement of sclerotin extruding force and anti-traction force around bone road.

In order to realize above-mentioned utility model purpose, medical holdfast of the present utility model has cone-shaped nail body, One group of main thread secondary screw thread identical with primary tread lead with least one set, phase it is formed with described nail The adjacent pitch between secondary ridge and main thread tooth is less than primary tread lead, the tooth higher primary school of secondary ridge High in the tooth of the main thread tooth being adjacent.

In a kind of preferred implementation of the present utility model, described least one set time screw thread includes first Secondary screw thread, the pitch between adjacent first time ridge and main thread tooth accounts for described primary tread lead 1/3 to 2/3.Preferably, the pitch between adjacent first time ridge and main thread tooth accounts for described master The 1/2 of lead.

In the embodiment being more highly preferred to of the present utility model, for the first time the tooth height of ridge account for with The tooth of its adjacent main thread tooth high 1/3 to 2/3.Preferably, the tooth Gao Zhanyu of ridge for the first time The tooth of the main thread tooth being adjacent high 1/2.

In another kind of preferred implementation of the present utility model, described least one set time screw thread also includes Screw thread for the second time.Pitch between adjacent first time ridge and main thread tooth accounts for described main thread and leads The 1/3 of journey, the pitch between adjacent first time ridge and second time ridge accounts for described main thread The 1/3 of helical pitch, the pitch between adjacent second time ridge and main thread tooth accounts for described main thread and leads The 1/3 of journey.

In the embodiment being more highly preferred to of the present utility model, for the second time the tooth of ridge high in The tooth of its adjacent first time ridge is high.

In yet another preferred form of the present utility model, described holdfast has nail tail, described nail Tail is provided with two string holes along the arrangement of holdfast length direction, and the inner edge of said two string holes is that light slips over The cambered surface crossed.

In the embodiment being more highly preferred to of the present utility model, said two string holes is circular port also And radius is identical, both 2.6 to 3.8 times that center of circle spacing distance is pore radius.

Medical holdfast of the present utility model due to nail in addition to conventional main thread, be also formed with Least one set time screw thread, the sclerotin extruding around its nail body part Ke Jianggu road, high different by tooth The multiple extruding force that multiple whorl produces compresses sclerotin further so that compress the region of bone around holdfast Bigger, the bone density after compression is closeer, and after i.e. holdfast implants sclerotin, the density of sclerotin is more about Greatly, the anti-traction force of holdfast strengthens.

Below with reference to accompanying drawing and specific embodiment, this utility model is described in further detail.

Accompanying drawing explanation

Fig. 1 is the structural representation of the medical holdfast according to a kind of embodiment of the present utility model；

Fig. 2 is the generalized section of the medical holdfast in Fig. 1；

Fig. 3 is the enlarged drawing of the region a in Fig. 2；

Fig. 4 is the generalized section of the medical holdfast according to another embodiment of the present utility model；

Fig. 5 is the enlarged drawing of the region b in Fig. 4；

Fig. 6 is the enlarged drawing of the region c in Fig. 2；

Fig. 7 is the screw thread extruding force schematic diagram of medical holdfast of the prior art；

Fig. 8 is the screw thread extruding force schematic diagram according to medical holdfast of the present utility model.

Detailed description of the invention

Technical term involved in the application is the most all according to the general explanation of this area. In this article, helical pitch is the axles of corresponding point-to-point transmission on middle line of adjacent two teeth on same helix To distance；Pitch is adjacent two teeth of screw thread axial distances of corresponding point-to-point transmission on middle line；Tooth is a height of The external diameter of the tooth of screw thread and the difference of internal diameter.

Fig. 1 is the structural representation of the medical holdfast according to a kind of embodiment of the present utility model.Figure 2 is the generalized section of the medical holdfast in Fig. 1.Fig. 3 is the enlarged drawing of region a in Fig. 2.

As shown in Figure 1 to Figure 3, the medical holdfast in present embodiment, there is cone-shaped nail body 1, nail Be formed with one group of main thread 11 and one group screw thread 12 for the first time with it, wherein, for the first time screw thread 12 with The helical pitch of main thread 11 is identical, for the first time the tooth of screw thread 12 with and the tooth of this screw thread 12 adjacent Pitch between the tooth of main thread 11 be less than helical pitch, for the first time the tooth higher primary school of the tooth of screw thread 12 in this The tooth of the tooth of the main thread that the tooth of secondary screw thread is adjacent is high.

As it is shown on figure 3, in the present embodiment, the tooth of adjacent first time screw thread 12 and main thread Pitch p1 between the tooth of 11 accounts for the 1/3 to 2/3 of primary tread lead s, and preferably 1/2.Herein Pitch p1 be for the first time screw thread 12 tooth with and the tooth of the adjacent main thread 11 of the tooth of this screw thread 12 The axial distance (as shown in the p1 in Fig. 3) of corresponding point-to-point transmission, primary tread lead s on middle line Be adjacent two teeth on main thread on middle line the axial distance of corresponding point-to-point transmission (such as the s in Fig. 3 Shown in).Now, with nail, it is formed with time screw thread, can be maximum when holdfast being screwed into sclerotin Limit ground uniformly extruding sclerotin around, and increase hold to greatest extent.

Preferably, the tooth height h2 of the tooth of screw thread 12 accounts for the tooth of the main thread 11 being adjacent for the first time Tooth height h1 1/3 to 2/3, preferably 1/2.The tooth height h2 of first time ridge herein is The external diameter of the tooth of screw thread 12 and the difference (as shown in the h2 in Fig. 3) of internal diameter, main thread tooth Tooth height h1 is the external diameter difference (as shown in the h1 in Fig. 3) with internal diameter of the tooth of main thread 11.

Fig. 8 shows what the many screw threads according to holdfast of the present utility model produced for sclerotin around bone road Multidirectional extruding force.From in figure, the medical holdfast of present embodiment is at the base of existing one group of main thread On plinth, being additionally formed with one group screw thread, holdfast nail body and main thread squeeze for the sclerotin around bone road Outside pressure, the secondary dual-pressure being screwed main thread generation compresses sclerotin further, causes holdfast week The region of confined pressure contracting bone is bigger, and around the density of sclerotin is bigger, and anti-traction force strengthens.

In the present embodiment, medical holdfast has nail body 1 and nail tail 2, length L1 of nail body 1 (as shown in Figure 1) the 75% to 85% of holdfast length L (as shown in Figure 1) is accounted for, the length of nail tail 2 Degree L2 (as shown in Figure 1) accounts for the 25% to 15% of holdfast length L, it is preferable that nail body length L1 Accounting for the 80% of holdfast length L, nail tail length L2 accounts for the 20% of holdfast length L.Such design is Ensure that to limits the length forming threaded nail body so that the hold of holdfast maximizes, with Time, in turn ensure that the length of nail tail inserting paragraph in screwdriver, can with the inserting paragraph length minimized Suitable twisting resistance is obtained to be screwed into by holdfast and to back-out to coordinate with screwdriver.Nail body and nail tail are the most permissible Being made up of titanium alloy, nail body and nail tail are integrally-formed.

Such as, for the holdfast of 15.7mm, its nail body length can be 12.5mm, is formed with nail Having one group of main thread and one group screw thread that helical pitch is identical, the helical pitch of main thread is 4.3mm, main thread Pitch between tooth and adjacent secondary ridge is 2.15mm.

In embodiment alternatively, the length of holdfast and secondary screw thread can be determined according to the actual requirements The various sizes such as pitch and Ya Gao.

Fig. 4 is the generalized section of the medical holdfast according to another embodiment of the present utility model. Fig. 5 is the enlarged drawing of the region b in Fig. 4.

As shown in Figure 4 and Figure 5, in the present embodiment, the structure of holdfast and aforementioned figures 1 to 3 In holdfast roughly the same, its difference is in addition to first time screw thread 12, nail body 1 on be also formed with Screw thread 13 for the second time.

As it is shown in figure 5, the spiral shell between adjacent first time ridge and the main thread tooth of present embodiment The 1/3 of primary tread lead s is accounted for, between adjacent first time ridge and second time ridge away from p1 Pitch p2 accounts for the 1/3 of primary tread lead s, the spiral shell between adjacent second time ridge and main thread tooth The 1/3 of primary tread lead s is accounted for away from p3.Pitch p1 herein is the tooth of screw thread 12 for the first time and and is somebody's turn to do The tooth of the main thread 11 that the tooth of secondary screw thread 12 is adjacent is the axial distance of corresponding point-to-point transmission on middle line (as shown in the p1 in Fig. 5), pitch p2 is tooth and and this second time screw thread of second time screw thread 13 The axial distance of the tooth of the first time screw thread 12 that the tooth of 13 is adjacent corresponding point-to-point transmission on middle line (as Shown in p2 in Fig. 5), pitch p3 be main thread 11 tooth with and the tooth of this main thread 11 adjacent The tooth of second time screw thread 13 on middle line the axial distance of corresponding point-to-point transmission (such as the p3 in Fig. 5 Shown in), primary tread lead s is adjacent two teeth axle of corresponding point-to-point transmission on middle line on main thread To distance (as shown in the s in Fig. 5).

Preferably, for the second time adjacent with the tooth of this second time screw thread for the tooth height h3 of the tooth of screw thread 13 the The tooth height h2 of the tooth of screw thread 12 is equal, it is preferable that the tooth height h3 of the tooth of screw thread 13 for the second time The tooth height h2 of the tooth of the first time screw thread 12 adjacent with the tooth of this second time screw thread all accounts for adjacent main spiral shell The 50% of the tooth height h1 of the tooth of stricture of vagina 11.Such design makes the region compressing bone around holdfast bigger, Anti-traction force more strengthens.

In other embodiments, can be formed with nail such as 3 groups or 3 groups with screw thread last time, can root The group number of time screw thread and the pitch of secondary screw thread and Ya Gao is determined according to actual demand.

Fig. 6 is the enlarged drawing of region c in Fig. 2.

As shown in Figure 6, in the present embodiment, the structure of holdfast and the anchor in aforementioned figures 1 to 3 Following closely roughly the same, its difference is that medical holdfast has nail tail 2, and nail tail 2 is provided with two along holdfast The string holes 21,22 of length direction arrangement, and the inner edge of two string holes is the cambered surface smoothly transitted, this Two string holes are for passing for high intensity suture.Nail tail can be hexagonal configuration, its outer rim and screwdriver internal orifice Form fit the screwdriver mouth that submerges, during bone surgery, nail tail coordinates to twist holdfast with screwdriver Enter in sclerotin and holdfast is back-outed.After holdfast is screwed into sclerotin, doctor when pull suture, this reality Execute the holdfast being provided with two string holes of mode unlike the holdfast of only one of which string holes line and line it Between easily there is friction and wrapping phenomena occur, two string holes can respective cabling, thus avoid line And rub between line and be wound around and the damage that causes.

Preferably, two string holes 21,22 are circular port and radius is identical, between both centers of circle Space from 2.6 to 3.8 times that d (as shown in Figure 6) is pore radius r, preferably d=3r.Preferably, The radius r of string holes accounts for the 15% of nail tail length L2, and the center of circle spacing distance d of string holes 21,22 accounts for nail The 45% of tail length L2, (i.e. nail tail is with nail body even for string holes 21 and the nail tail end near string holes 21 The end at the place of connecing) between distance d1 (as shown in Figure 6) account for nail tail length L2 10%, string holes Distance d2 (as shown in Figure 6) between 22 and nail tail the other end accounts for the 15% of nail tail length L2. Such distribution can minimize the interval between string holes, and can be with doctor in optimization operation to line Pulling force, without causing the deformation of any string holes etc..

In alternative embodiments, string holes can also be other inner edges be the shape of the cambered surface smoothly transitted Shape, such as oval etc., the abrasion when cambered surface so smoothly transitted can avoid suture to pass.

Although this utility model description combining detailed description of the invention this utility model is illustrated, But, it will be understood by those within the art that, detailed description of the invention of the present utility model is only It is intended to illustrate, protection domain of the present utility model is not constituted any restriction, without departing from this On the premise of utility model essence, the technical solution of the utility model can be carried out various amendment or Equivalents, any amendment or equivalents still fall within protection domain of the present utility model.

Claims

The most medical holdfast, has cone-shaped nail body, is formed with one group of main thread with described nail, and it is special Levy and be, with described nail, be also formed with the secondary screw thread that least one set is identical with the helical pitch of main thread, phase The adjacent pitch between secondary ridge and main thread tooth is less than primary tread lead, the tooth higher primary school of secondary ridge High in the tooth of the main thread tooth being adjacent.
Medical holdfast the most according to claim 1, it is characterised in that:

Described least one set time screw thread includes screw thread, adjacent first time ridge and main thread for the first time Pitch between tooth accounts for the 1/3 to 2/3 of described primary tread lead.
Medical holdfast the most according to claim 2, it is characterised in that:

Pitch between adjacent first time ridge and main thread tooth accounts for described primary tread lead 1/2。
Medical holdfast the most according to claim 2, it is characterised in that:

For the first time the tooth of the main thread tooth that the tooth Gao Zhanyu of ridge is adjacent high 1/3 to 2/3.
Medical holdfast the most according to claim 4, it is characterised in that:

For the first time the tooth height of ridge account for that the tooth of the main thread tooth being adjacent is high 1/2.
Medical holdfast the most according to claim 2, it is characterised in that:

Described least one set time screw thread also includes second time screw thread.
Medical holdfast the most according to claim 6, it is characterised in that:

Pitch between adjacent first time ridge and main thread tooth accounts for described primary tread lead 1/3, the pitch between adjacent first time ridge and second time ridge accounts for described primary tread lead 1/3, the pitch between adjacent second time ridge and main thread tooth accounts for the 1/3 of described primary tread lead.
Medical holdfast the most according to claim 6, it is characterised in that: ridge for the second time The high tooth in the first time ridge being adjacent of tooth is high.
Medical holdfast the most according to claim 1, it is characterised in that:

Described holdfast has nail tail, and described nail tail is provided with two lines along the arrangement of holdfast length direction Hole, the inner edge of said two string holes is the cambered surface smoothly transitted.
Medical holdfast the most according to claim 9, it is characterised in that: said two string holes is equal Identical for circular port and radius, both 2.6 to 3.8 times that center of circle spacing distance is pore radius.