US 8,556,909 B2 · System for inserting a pin into a screw

Abstract

A system for inserting an augmentation pin into an augmentation screw, including a pin-inserter with an axial through-bore and a lateral opening. A pin-magazine with a pin-retainer for an augmentation pin in insertable in the lateral opening. The pin-magazine is placed in the lateral opening of the pin-inserter and an augmentation pin in the pin-retainer is aligned with the axial through-bore. The augmentation pin may be pushed by means of a pusher from the pin-magazine into an augmentation screw, when the augmentation screw is arranged in front of the pin-inserter.

A pin insertion system comprising:

a plurality of augmentation polymer pins,
an augmentation screw comprising a proximal connection feature and an axial bore extending through the augmentation screw for receiving an augmentation pin, said augmentation in is sized and shaped to be fit into said axial bore, said axial bore includes a first step between a first section with a first diameter and a second section with a second diameter, a second step between the second section and a third section with a third diameter, wherein the third diameter is greater than the second diameter which in turn is greater than the first diameter, a first lateral bore located adjacent the first step and in the second section, and a second lateral bore located adjacent the second step and in the third section, such that, when the augmentation pin is inserted into the axial bore of the augmentation screw, the augmentation pin rests on the first step or the second step, depending on the diameter of the augmentation pin,
a tissue protection sleeve having a distal end including a first connection portion and a proximal end including a second connection portion, and a through bore extending axially through the proximal and distal ends;
said first connection portion is shaped for engaging with said proximal connection feature of said augmentation screw,
a pin-inserter for inserting the augmentation pin into the axial bore of the augmentation screw, comprising an elongated housing with an axial through-bore and a lateral opening, wherein the axial through-bore of the elongated housing and the lateral opening are connected to each other, and an elongated pusher which is movably and at least partially accommodated in the axial through-bore of the elongated housing and the augmentation screw, such that when the augmentation pin is placed in the lateral opening and is aligned with the axial through-bore of the elongated housing, then the augmentation pin moves by means of the pusher through at least a portion of the axial through-bore of the elongated housing, out of the housing and into the augmentation screw axial bore, said pin-inserter further comprises a third connection portion for engaging said second connection portion of said tissue protection sleeve for fastening the augmentation screw, and such that the axial through bore of the pin-inserter is aligned with the axial through bore of the augmentation screw and the axial through bore of the tissue protection sleeve when assembled,
a pin-magazine including a plurality of pin-retainers for retaining the plurality of augmentation pins therein, wherein the pin-magazine is designed corresponding to and is placeable in the lateral opening of the elongated housing of the pin-inserter and is adapted to align the pin-retainer with the axial through-bore of the elongated housing for inserting the augmentation pin into the augmentation screw, when the augmentation pin is located in the pin-retainer, and
an ultrasonic applicator comprising a connection portion for engaging said second connection portion of said tissue protection sleeve after removing the pin-inserter, said ultrasonic applicator further comprises a sonotrode extending axially through the through bore of the tissue protection sleeve and partially through the augmentation screw for fluidizing the augmentation pin within the augmentation screw and pressing the material of the augmentation pin through at least one of the lateral bores out of the augmentation screw.

4 more elements

Description4,359 words

Summary1,737 words

#The invention relates to a system for inserting a pin in a screw and augmenting the screw, including a pin-inserter, a pin-magazine, an augmentation screw and an augmentation pin. Furthermore, the invention relates to a method of use of the mentioned system.

#Known from U.S. Pat. No. 4,653,489 is a system wherein fixation cement is introduced through a screw into a portion of a bone afflicted by osteoporoses. Femoral neck fractures as well as distal femoral fractures can be fixated by means of this device.

#The system in accordance with prior art comprises a screw having a flow cavity, i.e. an axial through-bore through which bone cement can be introduced into the portion at the tip of the screw. The bone cement is advanced by a device which is releasably attached to the subsequent end of the screw. This device is similar to commercially available syringes. In use of this prior art device, the fixation cement is urged in an already fluidized state into the axial through-bore of the screw. Due to the pressure, the fixation cement is adequately fluidized, so that it can pass through the proximal end of the screw into the bone, as a result of which the screw is augmented in the bone.

Brief description of the drawings7 figures

#The invention will now be detailed by way of an exemplary embodiment with reference to the attached drawings.

#FIG. 1 shows three different side views and a section view of a pin-inserter according to the invention.

#FIG. 2 shows an isometric view as well as a front view of the pin-inserter of FIG. 1.

Detailed description2,478 words

#It is noted that the illustration in the drawings is only schematically and not to scale. In different figures, similar elements are provided with the same reference signs.

#FIG. 1 shows, from left to right, a view from the bottom of a pin-inserter 100 according to the invention, a section view along the line A-A, a top view of the pin-inserter, and a side view of the pin-inserter.

#The pin-inserter 100 includes a housing 110, an axial through-bore 120, a lateral opening 130, a connection portion 140, a grip portion 150, a locking element 160 and a projection 170.

Facts

Application

13/292,616Filed 9 Nov 2011 · continuation

Priority

30 Sep 2010

Published

US 2012/0143261 A17 Jun 2012

Granted

15 Oct 2013

Term ends

11 Dec 2030

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 72 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification8 codes

A61B 17/864
Pins or screws or threaded wires; nuts therefor: hollow, e.g. with socket or cannulated
A61B 17/8872
Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices: instruments for putting said…
A61B 17/74
Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin: devices for the head or neck…
A61B 17/8605
Pins or screws or threaded wires; nuts therefor: heads, i.e. proximal ends projecting from bone

Timeline

30 Sep 2010Priority claimedParent application PCT/EP2,010/064,542
9 Nov 2011Application filedUS 13/292,616
22 Feb 2012Assigned to Stryker Trauma GmbHassignment of assignor's interest
7 Jun 2012PublishedUS 2012/0143261 A1
15 Oct 2013GrantedUS 8,556,909 B2
19 Aug 2014Assigned to Stryker Trauma GmbH, Woodwelding AGassignment of assignor's interest
23 Nov 2015Assigned to Stryker European Holdings Vi, LLCnunc pro tunc assignment
23 Nov 2015Assigned to Stryker European Holdings I, LLCnunc pro tunc assignment
7 Jun 2020Assigned to Stryker European Operations Holdings LLCchange of name
7 Jun 2020Assigned to Stryker European Holdings III, LLCnunc pro tunc assignment
18 Dec 2024Assigned to Stryker European Operations Holdings LLCchange of address
12 Oct 2026TodayWithin its term
11 Dec 2030Term endsEstimated, includes 72 days of adjustment

System for inserting a pin into a screw

Life of this patent

System for inserting a pin into a screw

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims8

Description4,359 words

Drawings

Classification8 codes

Life of this patent

Description4,359 words